5G Baseband Pooling
DN293762694
Issue 26A
Approved on 2025-09-01
5G RAN Performance
Rel. 25R3-SR
Features, Issue 01
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5G Baseband Pooling
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5G Baseband Pooling
Table of Contents
5G baseband pooling summary of changes ............................................................................. 8
1 5G baseband pooling overview and benefits ........................................................................ 10
2 5G baseband pooling requirements ....................................................................................... 14
3 5G baseband pooling system impact ..................................................................................... 16
3.1 5G baseband pooling impact on physical resource blocks (PRBs) .......................... 19
3.2 5G baseband pooling impact on key performance indicators (KPIs) ...................... 21
3.3 5G baseband pooling impact on parameters related to radio link control (RLC) . 23
3.4 5G baseband pooling impact on physical downlink control channel (PDCCH) ...... 25
3.5 5G baseband pooling impact on other features ....................................................... 26
3.6 5G baseband pooling changes to the system ............................................................ 29
3.6.1 Extended baseband pooling of RRC-connected users - changes to the
system ...................................................................................................................... 29
4 5G baseband pooling features ................................................................................................. 30
4.1 5G baseband pooling features - TDD .......................................................................... 30
4.1.1 Shared real-time baseband resources - FR1 TDD ......................................... 32
4.1.2 Baseband pooling of up to 8 DL MIMO layers - FR1 TDD ABIO ................... 33
4.1.3 Baseband resource pooling-FR1 TDD .............................................................. 34
4.1.4 Baseband pooling—extensions for FR1 TDD .................................................. 39
4.1.5 Baseband pooling of up to 16 DL MIMO layers .............................................. 40
4.1.6 Baseband pooling - enhancements for FR1 TDD ........................................... 41
4.2 5G baseband pooling features - FDD .......................................................................... 42
4.2.1 Baseband pooling of scheduled UEs per slot - FDD ...................................... 42
4.2.2 Baseband pooling of RRC-connected users - FDD ........................................ 43
4.2.3 Baseband pooling of PRBs - FR1 FDD .............................................................. 44
4.2.3.1 Baseband pooling of PRBs - FR1 FDD configuration aspects ........... 46
4.2.4 PRB pooling for FDD cells - enhancements ..................................................... 47
4.2.5 Extended baseband pooling of RRC-connected users .................................. 48
4.2.6 PRB pooling for FDD cells – concept refinement ........................................... 49
5 5G baseband pooling reference data ..................................................................................... 54
5.1 5G baseband pooling faults and alarms ...................................................................... 54
5.2 5G baseband pooling measurements, counters, and KPIs ...................................... 55
5.3 5G baseband pooling parameters ................................................................................ 67
6 Activating and deactivating 5G baseband pooling ............................................................... 77
6.1 Activating and deactivating TDD 5G baseband pooling features ........................... 77
6.1.1 Activating full board BBP mechanism with enhanced instantaneous UL
capacity .................................................................................................................... 77
6.1.2 Activating 5GC002093 and CB008172 ........................................................... 78
6.1.3 Deactivating 5GC002093 and CB008172 ....................................................... 79
6.1.4 Configuring 5GC002093 and CB008172 ........................................................ 80
6.1.5 Pre-configurating CB008940 ............................................................................ 82
6.1.6 Activating CB008940 .......................................................................................... 85
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5G Baseband Pooling
6.1.7 Deactivating CB008940 ..................................................................................... 87
6.1.8 Activating CB007112 .......................................................................................... 88
6.1.9 Deactivating CB007112 ..................................................................................... 89
6.1.10 Activating CB010513 ....................................................................................... 90
6.1.11 Deactivating CB010513 ................................................................................... 91
6.1.12 Activating CB011028 ....................................................................................... 92
6.1.13 Deactivating CB011028 ................................................................................... 93
6.2 Activating and deactivating FDD 5G baseband pooling features ........................... 94
6.2.1 Activating 5GC002426 and CB007114 ........................................................... 94
6.2.2 Deactivating 5GC002426 and CB007114 ....................................................... 96
6.2.3 Activating 5GC001227 and CB009158 ........................................................... 96
6.2.4 Deactivating 5GC001227 and CB009158 ....................................................... 98
6.2.5 Activating CB009215 .......................................................................................... 99
6.2.6 Deactivating CB009215 ................................................................................... 100
6.2.7 Configuring automatic PRACH configuration index ..................................... 101
5G baseband pooling glossary ............................................................................................... 102
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List of Figures
Figure 1
Issue 26A.
Example of CSI RS +CSI IM slot configuration with BBP disabled and enabled
........................................................................................................................................... 22
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5G Baseband Pooling
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
5G baseband pooling features availability in SRAN ................................................ 14
PRACH configuration recommendation .................................................................... 50
Example of the recommended cell assignment to the PRACH groups ............... 51
Configuration of the slowPrbPoolFddFr1EnhCompMode parameter ................. 53
SRAN BTS faults related to the 5G BB pooling feature in the 22R1 release
........................................................................................................................................... 54
SRAN BTS faults related to the 5G BB pooling feature in the 24R1 release
........................................................................................................................................... 55
SRAN BTS counters related to the 5G BB pooling features in the 22R2 release
........................................................................................................................................... 56
SRAN BTS counters related to the 5G BB pooling features in the 22R3 and 22R4
releases ........................................................................................................................... 57
SRAN BTS counters related to the 5G BB pooling features in the 23R3 release
........................................................................................................................................... 58
Table 10
SRAN BTS counters related to the 5G BB pooling feature in the 23R4 release
........................................................................................................................................... 61
Table 11 SRAN BTS counters related to the 5G BB pooling feature in the 24R1 release
........................................................................................................................................... 62
Table 12 SRAN BTS KPIs related to the 5G BB pooling features in the 22R2 release
........................................................................................................................................... 64
Table 13 SRAN BTS KPIs related to the 5G BB pooling feature in the 22R3 release
........................................................................................................................................... 64
Table 14 SRAN BTS KPIs related to the 5G BB pooling feature in the 22R4 release
........................................................................................................................................... 65
Table 15 SRAN BTS KPIs related to the 5G BB pooling feature in the 23R1 release
........................................................................................................................................... 65
Table 16 SRAN BTS KPIs related to the 5G BB pooling feature in the 23R3 release
........................................................................................................................................... 66
Table 17 SRAN BTS KPIs related to the 5G BB pooling feature in the 23R4 release
........................................................................................................................................... 67
Table 18 SRAN BTS parameters related to the 5G BB pooling feature in the 22R1 release
........................................................................................................................................... 68
Table 19 SRAN BTS parameters related to the 5G BB pooling features in the 22R2 release
........................................................................................................................................... 69
Table 20 SRAN BTS parameters related to the 5G BB pooling feature in the 22R3 release
........................................................................................................................................... 69
Table 21 SRAN BTS parameters related to the 5G BB pooling feature in the 22R4 release
........................................................................................................................................... 70
Table 22 SRAN BTS parameters related to the 5G BB pooling feature in the 23R1 release
........................................................................................................................................... 70
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Table 23
SRAN BTS parameters related to the 5G BB pooling feature in the 23R3 release
........................................................................................................................................... 71
Table 24 SRAN BTS parameters related to the 5G BB pooling feature in the 23R4 release
........................................................................................................................................... 73
Table 25 SRAN BTS parameters related to the 5G BB pooling feature in the 24R1 release
........................................................................................................................................... 75
Table 26 Prerequisite parameter settings for the pre-configuration of the CB008940
feature ............................................................................................................................. 82
Table 27 Prerequisite parameter settings for configuring the 5GC002426 and CB007114
features ........................................................................................................................... 95
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5G Baseband Pooling
5G baseband pooling summary of changes
A list of changes between document issues. You can navigate to respective changed topics.
Changes between issues 26 (2025-08-13) and 26A (2025-09-01)
Baseband resource pooling-FR1 TDD
Note related to frame structures and unsupported configuration has been added.
Changes between issues 25 (2025-04-22) and 26 (2025-08-13)
5G baseband pooling impact on physical resource blocks (PRBs)
Note related to the NRBTSActivate over allocation avoidance for cell
stream PRB (actOverAllocAvoidForCellStrPrb) parameter has been added.
5G baseband pooling impact on physical resource blocks (PRBs)
The description has been updated to reflect the impact on BB pooling mechanism from
updated instantaneous capacity.
Activating full board BBP mechanism with enhanced instantaneous UL capacity
The procedure for Activating full board BBP mechanism with enhanced instantaneous UL
capacity has been added.
Activating CB008940
Note related to the NRBTSActivate over allocation avoidance for cell
stream PRB (actOverAllocAvoidForCellStrPrb) parameter has been added.
Activating CB008940
Note related to the setting of the NRCELLSearch space configuration Index
(type0SearchSpaceConfigurationIndex) parameter has been added.
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Activating CB010513
Note related to the NRBTSActivate over allocation avoidance for cell
stream PRB (actOverAllocAvoidForCellStrPrb) parameter has been added.
Activating CB011028
Note related to the NRBTSActivate over allocation avoidance for cell
stream PRB (actOverAllocAvoidForCellStrPrb) parameter has been added.
Changes between issues 24 (2025-02-03) and 25 (2025-04-22)
5G baseband pooling impact on physical resource blocks (PRBs)
Added paragraph in 25R2 and 25R3 releases.
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5G Baseband Pooling
1. 5G baseband pooling overview and benefits
The available baseband (BB) resources are dynamically distributed and shared among all the cells
allocated to a particular BB pool, depending on the traffic load in the BB pooling.
For every capacity plug-in unit or core unit, the memory and capability for resource processing
per slot are limited. With the given operator requirements regarding for example:
cell bandwidth and related maximum number of physical resource blocks (PRBs)
maximum number of RRC-connected UEs
maximum number of UEs scheduled per slot
the maximum capacity per cell is determined by the required maximum number of cells per
capacity plug-in unit or core unit.
When the number of cells per capacity plug-in unit or core unit increases, the requirements for
the memory and processing capabilities of the capacity plug-in unit or core unit also increase. In
case the requirements exceed the limits of the capacity plug-in unit or core unit, the operator can:
Increase the number of capacity plug-in units or core units and decrease the number of cells
per capacity plug-in unit or core unit. This approach allows for cells to operate at their
maximum capacity but it also increases the total cost of ownership (TCO) due to the costs
generated by the purchase of the additional capacity plug-in units or core units.
Statically divide resources of the capacity plug-in unit or core unit between the cells. This
approach allows to reduce TCO but it decreases the maximum capacity per cell without
consideration for the actual cell capacity needs. Such a decrease depends on the total number
of cells required in comparison to the number of cells the capacity plug-in unit or core unit can
serve with the maximum capacity.
In the following examples, the capacity plug-in unit or core unit can process a maximum of
9000 RRC-connected UEs, while the operator requires a maximum capacity of 1500 RRC
-connected UEs per cell:
For six cells on a capacity plug-in unit and a static resource allocation, the maximum cell
capacity is 1500 RRC-connected UEs.
For 12 cells on a capacity plug-in unit and a static resource allocation, the maximum cell
capacity is 750 RRC-connected UEs.
For 24 cells on a capacity plug-in unit and a static resource allocation, the maximum cell
capacity is 375 RRC-connected UEs.
Dynamically share the resources of the capacity plug-in unit or core unit between the cells with
the consideration for the actual capacity needs of each cell. This approach is called baseband
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5G Baseband Pooling
resource pooling.
Baseband resource pooling shares the resources to the cells on the capacity plug-in unit or core
unit based on the actual capacity needs while at the same time, the overall memory and resource
processing limits of the capacity plug-in unit or core unit aren't exceeded. With the baseband
resource pooling, cells with low traffic load free resources they don't need, which are then
allocated to cells with high traffic load. When the load imbalance between the cells of the capacity
plug-in unit or core unit increases, the performance of the baseband pooling also increases.
The exact number of configured cells depends on the configuration of the BTS Site Solution
features in your network. For more information, see the Single RAN
System/Dimensioning/SRAN Dimensioning Guideline document.
With the 5G baseband pooling feature enabled, make sure to adjust your network configuration
according to the following tools:
Single RAN/Reference Documentation/Adaptive PDCCH Configuration Tool
Single RAN/Reference Documentation/Configuration Guide to Paging in 5G
5GC002093: Shared Real Time Baseband Resources - FR1 TDD
The 5GC002093 feature allows using the MIMO layers and sharing real-time resources on the slot
level by multiple frequency range 1 (FR1) TDD cells. This provides resource optimization, which
improves network capacity. The 5GC002093 feature is applicable to the ABIL capacity plug-in
unit.
CB008172: Baseband Pooling of up to 8 DL MIMO Layers - FR1 TDD ABIO
The CB008172 feature improves network capacity by introducing the BB pooling functionality for
FR1 TDD deployments on the ABIO and ABIN capacity plug-in unit and ASOE core unit.
5GC002426: Baseband Pooling of RRC Connected Users - FDD and CB007114:
Baseband Pooling of Scheduled UEs per Slot - FDD
The 5GC002426 and CB007114 features improve cell capacity by pooling between the cells the
resources of the RRC-connected and scheduled UEs. This feature is supported on the ABIO
capacity plug-in unit and ASOE core unit.
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5G Baseband Pooling
5GC001227: Baseband Pooling of PRBs - FR1 FDD
The 5GC001227 feature improves network capacity by supporting DL and UL physical resource
block (PRB) pooling for the ABIO capacity plug-in unit and the ASOE core unit in the FR1 FDD band
deployments. With the 5GC001227 feature, depending on you network configuration, you can
deploy up to six cells on the ABIO capacity plug-in unit. For more information, see the CB006913:
NR ABIO BB Cell Sets 24 Cells FDD CPRI and OBSAI feature and the Operating
Documentation/ Dimensioning/SRAN Dimensioning Guideline document. By enabling PRB
pooling, cells are organized into smaller resource consumption groups, which frees resources.
CB009158: PRB Pooling for FDD Cells – Enhancements
The CB009158 feature improves cell management by extending the flexibility of the FDD
deployments with a higher number of cells. The CB009158 feature removes limitation for the
PRB pooling functionality restricted by the 5GC001227: Baseband Pooling of PRBs - FR1 FDD
feature. The CB009158 feature can be used in FR1 FDD with the ABIN and ABIO capacity plug-in
units or the ASOE core unit.
CB009265: Extended Baseband Pooling of RRC-Connected Users
The CB009265 feature improves network capacity by supporting the configuration of up to 1500
RRC-connected UEs per FR1 FDD and TDD cell. The CB009265 feature applies to the ABIO
capacity plug-in unit with an extended cell set.
CB008940: Baseband Resource Pooling - FR1 TDD
The CB008940 feature improves network capacity by supporting pooling of the resources such
as UEs scheduled per transmission time interval, RRC-connected UEs, PRBs for FR1 TDD cells. The
CB008940 feature is supported on the ABIO and ABIN capacity plug-in unit and ASOE core unit
with the Enhanced Common Public Radio Interface (eCPRI) fronhaul interface.
CB007112: Baseband Pooling of up to 16 MIMO Layers
The CB007112 feature improves network capacity by supporting up to 16 DL MIMO layers for 3
FR1 TDD cells with bandwidth up to 100 MHz for the ABIO capacity plug-in unit and ASOE core
unit.
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CB010513: Baseband Pooling—Extensions for FR1 TDD
The CB010513 feature improves cell capacity and management by extending the flexibility of the
FR1 TDD deployment with a higher number of cells. With the CB010513 feature, you can
configure up to 1500 RRC-connected UEs for non-beamforming scenarios. Additionally, you can
enable baseband pooling together with the Slice Aware Scheduler, VoNR , DL Interference
Generation , and Coordination of TDD Deployments over Country Borders functionalities. The
CB010513 feature is supported on the ABIN and ABIO capacity plug-in unit and ASOE core unit
with the Common Public Radio Interface (CPRI) and enhanced Common Public Radio Interface
(eCPRI) interface.
CB011028: Baseband Pooling - Enhancements for FR1 TDD
The CB011028 feature improves the functionality introduced with the CB010513 feature by
supporting the dynamic resource allocation for remote interference management reference signal
(RIM-RS) and supercell configuration. With the CB011028 feature, supercell configurations are
allocated on half of the capacity plug-in unit with baseband pooling disabled, while the other half
can allocate normal cells with baseband pooling enabled.
CB009215: PRB Pooling for FDD Cells – Concept Refinement
The CB009215 feature improves the functionality introduced with the 5GC001227 feature. The
CB009215 feature increases cell throughput and enhances baseband pooling performance by
optimizing the utilization of layer 1 (L1) processing resources for PRB handling in DL and UL.
The CB009215 feature introduces the functionality for the automatic assignment of the physical
random access channel (PRACH) configuration index for the FDD deployments. This functionality
can be enabled without activating the CB009215 feature.
The CB009215 feature supports frequency range 1 FDD deployments with a higher number of
cells.
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5G Baseband Pooling
2. 5G baseband pooling requirements
Hardware, software, and license requirements
Equipment preconditions
Table 1: 5G baseband pooling features availability in SRAN
Feature
Available since
5GC002093: Shared Real Time Baseband Resources—FR1 TDD
22R1
CB008172: Baseband Pooling of up to 8 DL MIMO Layers—FR1
TDD ABIO
22R1
5GC002426: Baseband Pooling of RRC Connected Users—FDD
22R2
CB007114: Baseband Pooling of Scheduled UEs per Slot—FDD
22R2
5GC001227: Baseband Pooling of PRBs—FR1 FDD
22R3
CB009158: PRB Pooling for FDD Cells—Enhancements
22R4
CB009265: Extended Baseband Pooling of RRC Connected Users
23R1
CB008940: Baseband Pooling of PRB - FR1 TDD
23R3
CB007112: Baseband Pooling of up to 16 MIMO layers
23R3
CB010513 Baseband Pooling—Extensions for FR1 TDD
23R4
CB011028: Baseband Pooling - Enhancements for FR1 TDD
24R1
CB009215: PRB Pooling for FDD cells – Concept Refinement
24R1
For SRAN supported hardware and software, see Operating Documentation/Single RAN
Features/List of Features and Documents Single RAN Operating Documentation.
For ASiR System 5G supported hardware and software, see Operating Documentation/AirScale
Indoor Radio System 5G/ASiR System 5G Features/List of Features Supported in ASiR
System 5G AirScale Indoor Radio System 5G Operating Documentation.
For ASiR System supported hardware and software, see Operating Documentation/AirScale
Indoor Radio System/ASiR System Features/List of Features in ASiR System AirScale Indoor
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5G Baseband Pooling
Radio System Operating Documentation.
Sales information
For ASiR System 5G licenses information, see Operating Documentation/AirScale Indoor Radio
System 5G/ASiR System 5G Features/List of Features Supported in ASiR System 5G.
For ASiR System licenses information, see Operating Documentation/AirScale Indoor Radio
System/ASiR System Features/List of Features in ASiR System.
Additional configuration
The baseband pooling is mandatory for the ABIP and ABIQ capacity plug-in units and ASOF, ASOG,
and ASOH core units. All the baseband pooling features are enabled by default on the BTS level
when the ABIP and ABIQ capacity plug-in units ASOF, ASOG, and ASOH core units are deployed
with the following cell configuration:
Frequency range 1 (FR) 1 TDD cells with up to 8DL layers
FR 1 TDD cells with 16 DL layers
FR1 FDD cells
In case of the deployment with ABIP and ABIQ capacity plug-in unit the NRDU Flexible 5G
FR1 carrier aggregation mode (flexibleCAMode) parameter needs to be set to
NumberCellAmount.
Note:
The cell mapping to baseband pools can change between gNB/cell restarts, because the
pool allocation is affected by the order of radio detection in the startup or by the order of
operation between resets. This should be considered during configuration (for example,
PRACH configuration). This can also lead to a change in TRS or CSI-RS positions.
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5G Baseband Pooling
3. 5G baseband pooling system impact
The 5G baseband (BB) pooling impacts network performance and capacity.
5GC002093: Shared Real Time Baseband Resources - FR1 TDD and
CB008172: Baseband Pooling of up to 8 DL MIMO Layers - FR1 TDD ABIO
The 5GC002093 and CB008172 features supports three cells in the 8-layer DL and 4-layer UL
on the ABIL and ABIO capacity plug-in units, and three cells in the 4-layer DL and 4-layer UL
deployment on the ABIL capacity plug-in unit.
5GC002426: Baseband Pooling of RRC Connected Users - FDD and CB007114:
Baseband Pooling of Scheduled UEs per Slot - FDD
The 5GC002426 and CB007114 features enable support for a higher number of FDD cells on
the ABIO capacity plug-in unit and ASOE core unit.
5GC001227: Baseband Pooling of PRBs - FR1 FDD
The 5GC001227 feature enables support for a higher number of frequency range 1 (FR1) FDD
cells per ABIO capacity plug-in unit and ASOE core unit.
CB009265: Extended Baseband Pooling of RRC-Connected Users
The CB009265 feature increases the number of RRC-connected UEs in FDD deployments with
the ABIO capacity plug-in unit, the maximum number of RRC-connected UEs increases from 560
up to 1500.
CB008940: Baseband Resource Pooling - FR1 TDD
The CB008940: Baseband Resource Pooling - FR1 TDD features improve capacity by
supporting pooling of the resources such as UEs scheduled per transmission time interval, RRC
-connected UEs, and MIMO-layer PRBs for the FR1 TDD configuration, which allows you to enable a
higher number of cells. Additionally, you can configure up to six cells with 8DL and 4UL MIMO
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5G Baseband Pooling
layers.
With the CB008940 feature enabled, a performance degradation can occur. To prevent it, the
following improvements are introduced in the baseband pooling algorithm:
The sum of the served cell bandwidths is more evenly balanced among the baseband pools.
After allocating the minimum number of PRBs for GRB and non-GRB traffic, the remaining PRBs
are more evenly distributed among the cells in one of the baseband pools. Cells with low and
medium loads receive more PRBs than before and can better adapt to changing load
conditions.
You can enable the improvements in the baseband pooling algorithm by setting the NRBTS
Activate enhanced algorithm of baseband resource pooling FR1 TDD
(actBbPoolTddFr1AlgEnh) parameter to true.
The CB008940 feature enables the PRB pooling, which impacts the average cell throughput per
cell depending on the number of cells on the gNB.
CB007112: Baseband Pooling of up to 16 MIMO Layers
The CB007112 feature improves the average DL throughput by extending the FR1 TDD DL MIMO
layer pooling capabilities to 16 DL layers for the ABIO capacity plug-in unit and ASOE core unit.
CB010513: Baseband Pooling—Extensions for FR1 TDD
The CB010513: Baseband Pooling—Extensions for FR1 TDD feature improves capacity by
supporting up to 1500 RRC-connected UEs for FR1 TDD cells for non-beamforming scenarios on
ABIN and ABIO capacity plug-in unit and ASOE core unit.
With the CB010513 feature enabled, the degradation of the cell throughput can occur depending
on the configuration of the channel state information reference signal (CSI-RS) periodicity. If the
network is configured with periodicity of 160 and 320 slots, throughput degradation can be
prevented by setting the NRBTS Activate explicit TRS CSI-RS pooling solution
(actExplicitCsirsPoolSolution) to false. In case the
actExplicitCsirsPoolSolution parameter is set to true, the network can be configured
with periodicity of 40, 80, 160, and 320 slots. However, throughput degradation can occur with
periodicity of 160 and 320 slots.
Setting the following parameters to the given values results in the physical downlink shared
channel (PDSCH) not being present in the slots reserved for tracking reference signal (TRS) in the
pooling group (even though these slots may not be used by a specific cell):
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5G Baseband Pooling
The actExplicitCsirsPoolSolution parameter to true
The NRCELL Activate CSI-RS for tracking rate matching for PDSCH
(actPdschRmCsirsForTracking) parameter to false
Consequently, the above-mentioned operation leads to a decrease in the following counters:
M55308C10003 Number of PRBs available for PDSCH
M55308C00001 Sum of DL Data slots
M55308C23002 Number of PDSCH PRBs used by 5QI1
M55335C02005 Number of Downlink slots without PDCCH symbol
configured in Cell BWP-0
M55335C08005 Number of Downlink slots without PDCCH symbol
configured in Cell BWP-2
M55308C10003 Number of PRBs available for PDSCH
M55308C10001 Number of PRBs used for PDSCH
and others related to slots and symbols without PDSCH
CB009215: PRB Pooling for FDD Cells – Concept Refinement
The CB009215 feature impacts cell performance and throughput as follows:
The DL cell throughput increases up to 6% by avoiding slots without any physical downlink
shared channel (PDSCH) allocation in DL slots carrying Channel State Information Reference
Signal (CSI-RS). This PDSCH resource allocation privilege can't be assigned to all cells on the
capacity plug-in unit or core unit in the same slot, without exceeding their resource processing
capabilities per slot. The baseband resource manager decides, based on the actual traffic
needs, to which cells this privilege is assigned.
The resource allocation interval is reduced by 20%, shortening the decision time from 50 ms to
40 ms.
The UE performance, including high-speed UE's can be downgraded due to the increase of the
minimum tracking reference signal (TRS) periodicity for CSI-RS for TRS. For more information
on high-speed UEs, see the CB008792: High-Speed UE Support in FR1 TDD Cells feature.
The CB009215 feature reduces the values of the following counters:
M55300C02029 and M55300C06028
This is related to more accurate CQI estimation as UE can measure interference at CSI-IM
symbols from neighboring cells Zero-Allocation Bypass (ZAB) privilege or without pooling. This
can lead to a lower MCS and higher transmission robustness. As a result, a lower number of
RxTx's can be expected in this case.
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M55308C00017
This is related to the changing of the TRS locations (earlier slot 0 and now slot 1 and 2) and the
lack of PDSCH in the TRS slots for cells without ZAB. The reduction of the counter value is seen
for TDD cells, which is attributed to the same reason.
3.1 5G baseband pooling impact on physical resource blocks
(PRBs)
Cells can't use all of their PRBs when you enable the support of a high number of cells. This is
because these cells share the resources.
The PRB pooling determines the number of UL and DL PRBs assigned to each cell in the pool. A
certain number of PRBs is reserved per cell and isn't changed. This is to guarantee that each cell
has the minimum number of PRBs needed to keep it operational. Some examples of guaranteed
PRBs are as follows:
PRBs used for cell-specific channel state information reference signal (CSI-RS) in DL
PRBs used for long physical uplink control channel formats 1 and 3 in UL
In dynamic spectrum sharing (DSS) cells with PRB pooling enabled, where one-symbol PDCCH
Downlink Control Information (DCI) is configured and Aggregation Level (AL) 8 is requested, AL4
can be enforced if the resource manager allocates a cell less than 96 PRBs. As a result, the link
-level reliability of AL4 instead of AL8 can be expected. DSS cells always use DL/UL PDCCH split,
and AL8 DCI requires 48 PRBs in one direction (a total of 96 PRBs are required for DL and UL).
In DSS cells, with enabled rate matching (RM), when the NRDSSLTE Activate rate
matching for CSI-IM (actRateMatchedCsilm) parameter is set to true, the Non-zero
power (NZP) CSI-RS for channel acquisition resources are placed in slots reserved for MSG2
transmissions. With the NRCELL PRACH configuration index
(prachConfigurationIndex) parameter, you can define the PRACH preamble configuration
as well as a reserved slot for MSG2 transmission in DSS-RM cells.
The baseband pooling (BBP) algorithm works based on resource limits as determined under
maximum traffic load conditions.
Maximum traffic load conditions mean that all UEs in a slot have a maximum number of MIMO
layers and maximum modulation and coding scheme (MCS) and transport block size (TBS), to
name a few of the conditions. Such conditions are not representative of the common traffic load
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encountered in field deployments. There, average MCS / TBS values used in the cells are much
smaller than the maximum possible ones since the radio conditions vary across the coverage
range of each cell. This does not allow all users to get maximum MCS / TBS all the time.
For FR1 TDD, the BBP algorithm is updated in the 25R2 release and can adapt the BBP resource
limits and allocations based on field traffic load conditions. This update increases the number of
PRBs available per cell in the pool, which may also increase the average cell throughput. This is
valid for both UL and DL PRBs, and throughput, and changes will be visible in the respective KPIs.
The increased UL and DL PRB capacity under field traffic conditions is termed as instantaneous
UL/DL capacity.
Support for this BBP algorithm update with respect to instantaneous capacity is limited to the
ABIP capacity plug-in unit, as well as ASOG and ASOH core units.
Note:
Since the 25R3 release, this BBP algorithm update is supported for both non-Dual Boost
and Dual Boost solutions.
In the 25R2 release, for FR1 TDD the full board pooling concept is introduced for non-Dual Boost
solution.
With full board pooling, all baseband resources are managed in one large pool instead of two half
-sized pools. As compared to half board pooling, the full board pooling:
removes the necessity of bandwidth balancing between two pools,
avoids any unnecessary capacity restrictions with respect to UL capacity due to the lack of
resource sharing between pools, and
removes the restrictions introduced by CB007112 for the number of DL UEs/TTI when cells
are configured with 16 DL MIMO layers.
Note:
In the 25R2 release, the full board BBP mechanism applies for 16 DL MIMO layers
deployments only.
In the 25R3 release, the instantaneous UL capacity on FR1 TDD cells is further improved when
combined with full board pooling. This increases the average cell UL throughput further as
compared to the 25R2 release. The enhanced instantaneous UL capacity is supported only on the
ABIP capacity plug-in unit with any chosen configuration of UL and DL MIMO layers and the UL
receiver. It is highly recommended to use the 8RX IRC receiver for best UL performance. For the
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details on activation and respective parameter settings, see Activating and deactivating 5G
baseband pooling / Activating and deactivating TDD 5G baseband pooling features / Activating
full board BBP mechanism.
Note:
Support for enhanced instantaneous UL capacity on additional units is planned, with
further deployment options to be included in future releases.
Note:
The TDD PRB pooling DL performance is improved by enabling the NRBTS Activate
over allocation avoidance for cell stream
PRB(actOverAllocAvoidForCellStrPrb) parameter. When enabled, the PRB
pooling algorithm adapts the maximum PRB allocation per cell based on both the actual
PRB demand and the total available PRBs as per cell bandwidth for all cells in the pool. The
accuracy of the DL PRB assignment to the cells in the pool is improved. The lower the
actual DL PRB demand is as compared to the total available PRBs, the higher the DL PRB
allocation accuracy becomes (as compared to disabling this function) and more cells in the
pool can be allocated with DL PRBs. Therefore, the average DL throughput in a cell and in
the pool is increased.
Note that this adaptation follows the same pooling decision update period, so any rapid
changes in PRB demand will be subject to the same delays of the PRB pooling algorithm
until the next PRB pooling interval arrives.
This functionality is enabled by default.
3.2 5G baseband pooling impact on key performance
indicators (KPIs)
Due to cell resource pooling at different layers, when dedicated BB pooling features are activated,
depending on network configuration you can experience a decrease in the cell processing KPIs at
those layers.
This decrease can happen if a high load is simultaneously present in several cells that use shared
resources. It can also occur in the case of asymmetric traffic load assigned to the cells of separate
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BB pools. Such behavior can be observed when the following features are activaed:
5GC002426: Baseband Pooling of RRC Connected Users - FDD
CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD
5GC001227: Baseband Pooling of PRBs - FR1 FDD
CB009158: PRB Pooling for FDD Cells – Enhancements
CB009265: Extended Baseband Pooling of RRC-Connected Users
CB008940: Baseband Resource Pooling - FR1 TDD
CB009215: PRB Pooling for FDD Cells – Concept Refinement
Depending on your network configuration, the 5GC001227: Baseband Pooling of PRBs - FR1
FDD feature impacts KPIs as follows:
The maximum cell-specific DL throughput and maximum UE-specific DL throughput on a
pooled cell can decrease by approximately 5% due to the overhead of pooling of cell-specific
CSI-RS.
The average cell-level and UE-level throughputs can decrease due to the support of a higher
number of cells. Latency can increase in high user traffic load conditions on the pool level.
For the list of KPIs, see: 5G baseband pooling measurements, counters and KPIs.
Impact of the CSI RS pooling solution on KPIs
Before baseband pooling (BBP), all cells on a capacity plug-in unit transmit the CSI RS + CSI IM
reference signals in the same downlink slot.
To support a higher number of cells for FDD deployments, the CSI RS + CSI IM reference signals
transmitted in the downlink are staggered in the time domain. Cells in one pool are divided into
CSI RS + CSI IM pooling groups, and each group is assigned a different slot for CSI RS + CSI IM
transmission.
Figure: Example of CSI RS +CSI IM slot configuration with BBP disabled and enabled shows an
illustrative example where the boxes labeled as “CSI” indicate the transmission slot for CSI RS +
CSI IM.
Figure 1: Example of CSI RS +CSI IM slot configuration with BBP disabled and enabled
This implementation impacts KPIs as follows:
In a scenario where all cells don't have BBP enabled, UEs don't measure PDSCH interference on
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CSI RS + CSI IM symbols. This is because all cells transmitting CSI RS + CSI IM on the same DL
slot and symbol. Therefore, UEs channel quality indicator (CQI) and rank estimation are
optimistic as compared to the actual interference situation, for example the values of reported
CQI and rank indication (RI) are rather high.
In a scenario where all cells have BBP enabled, cells transmit CSI RS + CSI IM in different slots,
see Figure 1. Therefore, UEs measure actual interference on CSI RS + CSI IM symbols coming
from PDSCH transmissions in neighboring cells. Due to that the UEs CQI and rank estimation
are realistic compared to the actual interference situation. The reported CQI and RI values are
expected to be lower as compared to the case with the disabled BBP.
In a mixed scenario where some cells have BBP enabled and some don't, again UEs measure
actual interference on CSI RS + CSI IM symbols coming from PDSCH transmissions in
neighboring cells. Therefore, reported CQI and RI values are expected to be lower as compared
to the case of BBP disabled.
Depending on the FDD deployment scenario (large range cells with PRACH format 1 compared to
smaller range cells with PRACH format 0), data traffic in cell edge compared to cell center and
other factors, DL throughput degradation can happen.
To counteract this issue, you can configure the NRBTS Slow PRB pooling FDD FR1
enhancement compatibility mode (slowPrbPoolFddFr1EnhCompMode) parameter.
For more details, see Compatibility mode for enhanced slow PRB pooling in FDD FR1 section. This
functionality prevents PDSCH transmissions during the CSI-RS + CSI-IM symbol, resulting in a
more stable link adaptation and improved throughput. This functionality is triggered regardless of
whether pooling is active at gNB to ensure the CSI-IM coexistence mechanism between non
-pooled and pooled neighbor cells. However, a peak throughput reduction of up to ~1% can occur
for non-pooled cells and pooled cells with Zero-Allocation Bypass (ZAB) privilege.
3.3 5G baseband pooling impact on parameters related to
radio link control (RLC)
With the PRB pooling enabled, cells have fewer PRBs reserved for data, and the transport block
sizes (TBSs) are reduced.
As a result, the RLC service data unit (SDU) segments are transmitted more often, especially for
UEs in less favorable radio conditions. The increased RLC SDU segment transmission increases the
probability of a segment loss resulting in the loss of the RLC SDU. In case the RLC SDU is lost, the
RLC SDU re-transmission rate increases. The increased RLC SDU segment re-transmission
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increases the reception delay of the Packet Data Convergence Protocol (PDCP) protocol data unit
(PDU) and can result in the possible discard of PDCP PDU after the expiry of the reordering timers.
In case the MU-MIMO is enabled together with the PRB pooling, the same amount of PRBs is
shared between a higher number of UEs. As a result, the UEs are scheduled less often and there is
a decrease in the RLC re-transmission compared to the PRB pooling enabled without the MU
-MIMO.
In the case of cells with high loads, in order to decrease the UL traffic load, Nokia recommends
decreasing the frequency of the RLC PDUs re-transmission by increasing the value of re
-transmission and prohibition timers. You can limit the number of discards of the PDCP PDUs by
adjusting the reordering timers. Nokia recommends the following parameter configurations:
Set the NRBTS Activate FDM UE skipping overload control
(actFdmUeSkippingOlc) parameter to true.
Set the NRDRB_RLC_AM Timer poll retransmit DL (dlTPollRetr) parameter to
100ms.
Set the NRDRB_RLC_AM Timer poll retransmit UL (ulTPollRetr) parameter to
100ms.
Set the NRDRB_PDCP Timer reordering DL (tReorderingDl) parameter to 300ms.
Set the NRDRB_PDCP Timer reordering UL (tReorderingUl) parameter to 300ms.
Set the NRDRB_RLC_AM Timer status prohibit DL (dlTProhib) parameter to
50ms.
Set the NRDRB_RLC_AM Timer status prohibit UL (ulTProhib) parameter to
50ms.
Increasing the values of the re-transmission and prohibition timers can impact the NR_1322:
5G DL RLC data PDU discard ratio by High RLC for QoS group 01 key
performance indicator. The timer values can be tuned based on the following criteria:
The average number of RRC-connected UEs
The number of UEs with data per slot
PRB utilization
If the PRB pooling is enabled together with the dynamic spectrum sharing (DSS), Nokia
recommends configuring the following RLC-related parameters:
Set the NRDSSLTE Timer status prohibit DL for DSS (dssDlTProhib)
parameter to 50ms.
Set the NRDSSLTE Timer status prohibit UL for DSS (dssUlTProhib)
parameter to 150ms.
Set the NRDSSLTE Timer poll retransmit DL for DSS (dssDlTPollRetr)
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parameter to 100ms.
Set the NRDSSLTE Timer poll retransmit UL for DSS (dssUlTPollRetr)
parameter to 100ms.
Note:
Enabling features such as multi-user MIMO (MU-MIMO) together with the PRB pooling can
result in minor impacts, including an increase of physical DL control channel (PDCCH)
blocking, which results in the delay of DL and UL transmission. The delay of DL and UL
transmission can lead to a delay in the transmission of the RLC PDUs, causing an increase
in the DL RLC re-transmission.
3.4 5G baseband pooling impact on physical downlink
control channel (PDCCH)
A list of 5G baseband pooling features impacting the PDCCH resources
With the CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD, 5GC002426:
Baseband Pooling of RRC Connected Users - FDD, 5GC001227: Baseband Pooling of PRBs FR1 FDD, CB009158: PRB Pooling for FDD cells – Enhancements, CB007112: Baseband
Pooling of up to 16 DL MIMO Layers, CB008940: Baseband Resource Pooling - FR1 TDD, and
CB009215: PRB Pooling for FDD Cells – Concept Refinement features enabled, you can expect
the following impacts on the PDCCH:
Baseband pooling increases the number of UEs that can be scheduled per transmission time
interval (TTI), resulting in a higher demand for PDCCH resources for scheduled UEs, which
increases the possibility of the PDCCH blocking. Such behavior is more pronounced in the case
of a small CORESET size.
In specific scenarios, especially those characterized by high load on the capacity plug-in unit,
cells can be allocated with smaller amounts of PRBs, resulting in the configured CORESET
resources being partially unavailable. The unavailable CORESET can contribute to a higher
occurrence of PDCCH blocking.
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3.5 5G baseband pooling impact on other features
A list of correlations between 5G baseband (BB) pooling and other features
The following features need to be enabled before activating the 5GC002093: Shared Real Time
Baseband Resources - FR1 TDD and CB008172: Baseband Pooling of up to 8 DL MIMO
Layers - FR1 TDD ABIO features:
5GC000679: UL/DL FDM Scheduling
5GC002537: FDM Allocation Enhancements
Note:
The 5GC002093 needs to be enabled on ABIL capacity plug-in unit. The CB008172 needs
to be enabled for the ABIO capacity plug-in unit and ASOE core unit. Both features use the
same activation parameter.
The following features need to be activated before activating the 5GC001227: Baseband
Pooling of PRBs - FR1 FDD feature:
5GC002426: Baseband Pooling of RRC Connected Users - FDD
CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD
The following features need to be deactivated before activating the 5GC001227: Baseband
Pooling of PRBs - FR1 FDD feature:
5GC001242: UL and DL PRB Blanking for 10 MHz DSS Carrier
5GC000431: Cell Switch-Off (Component Carrier) for Energy Efficiency
The following features need to be activated before activating the CB009158: PRB Pooling for
FDD Cells – Enhancements feature:
5GC002426: Baseband Pooling of RRC Connected Users - FDD
CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD
5GC001227: Baseband Pooling of PRBs - FR1 FDD
The following features need to be deactivated before activating the CB009158: PRB Pooling for
FDD Cells – Enhancements feature:
5GC002063: LTE-NR DSS Extension to SA+NSA in FDD
5GC001586: LTE-NR CRS Rate Matching DSS for FDD EN-DC PSCell
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The CB009158: PRB Pooling for FDD Cells - Enhancements feature impacts the physical
resource block (PRB) pooling functionality introduced with the 5GC001227: Baseband Pooling of
PRBs - FR1 FDD feature by enabling the interaction between the CB009158 feature and the
following features:
5GC002558: UL and DL PRB Blanking at Carrier Edge
With the CB009158 feature, you can enable concurrent support of the PRB pooling along with
the UL and DL PRB blanking.
5GC000526: DL Interference Generation - Single Cell
With the CB009158 feature, you can enable the 5GC000526 feature, which generates an
artificial load on the physical downlink shared channel in a cell. Load generation allows you to
test DL performance in neighbor cells without having a test UE in the cell where this feature is
activated.
5GC000431: Cell Switch-Off (Component Carrier) for Energy Efficiency
With the CB009158 feature, you can enable the 5GC000431 feature to enable the load
-based power saving operation mode on the classical gNB.
The following features need to be activated before activating the CB007112: Baseband pooling
of up to 16 MIMO layers feature:
CB008940: Baseband Resource Pooling - FR1 TDD
CB008701:DL MU MIMO - 16 Layers
The CB007601:Cell Specific CSI-RS for TDD Non-Beamforming feature needs to be
deactivated before activating the CB008940: Baseband Resource Pooling - FR1 TDD feature.
Note:
Since the 23R4 release, this limitation is removed.
The following features need to be deactivated before activating the CB008940: Baseband
Resource Pooling - FR1 TDD feature:
CB007601:Cell Specific CSI-RS for TDD Non-Beamforming
Slice-Aware Scheduler related features
5GC000526 DL Interference Generation
CB008379 GBR Services for SA
5GC000524: DL MU-MIMO for Digital Beamforming
The 5GC002516: Coordination of TDD Deployments over Country Borders impacts the
CB008940: Baseband Resource Pooling - FR1 TDD feature.
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With the 5GC002516 feature enabled, the channel state information reference signal (CSI-RS)
resources of the cell aren't transmitted but they are still allocated to the UEs, resulting in the
limitation of throughput due to incorrect channel state information (CSI) reports.
Note:
Due to the tracking reference signal being allocated at different slot, you need to adjust
the common search space according to Adaptive PDCCH Configuration Tool. For more
information, see Reference Documentation/Product configurations/Adaptive PDCCH
Configuration Tool.
The CB008940 feature needs to be activated before activating the CB010513: Baseband
pooling - Extensions for FR1 TDD feature.
The CB010513 feature impacts the functionalities introduced with the CB008940 feature. It
changes the interaction of the CB008940 feature with the following features:
The CB010513 feature improves the interaction with the 5GC002516 feature by skipping the
usage of muted CSI-RS resource sets. With this improvement, only not muted CSI-RS resource
sets are allocated to the UEs. Such an approach was not supported with the CB008940
feature.
5GC000526
The CB010513 feature improves the interaction with the 5GC000526 feature. With this
improvement, the load generation of an artificial physical downlink shared channel (PDSCH)
considers the DL PRBs provided for the cell as all the available PRBs, which wasn't the case with
the CB008940 feature.
CB007601: Cell Specific CSI-RS for TDD Non-Beamforming
The CB010513 feature removes the limitation introduced with the CB008940 feature by
supporting the activation of the CB007601 feature together with the CB010513 feature.
With the CB010513 feature enabled, you can configure 40 cell-specific slots for Channel State
Information Reference Signal (CSI-RS).
The 5GC000524: DL MU-MIMO for Digital Beamforming feature needs to be deactivated
before activating the CB010513 feature.
The CB010513 feature needs to be activated before activating the CB011028: Baseband
Pooling - Enhancements for FR1 TDD feature.
The following features need to be activated before activating the CB009215: PRB Pooling for
FDD Cells – Concept Refinement feature:
5GC002426: Baseband Pooling of RRC Connected Users - FDD
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CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD
5GC001227: Baseband Pooling of PRBs - FR1 FDD
CB009158: PRB Pooling for FDD Cells - Enhancements
3.6 5G baseband pooling changes to the system
Changes to the system introduced with the 5G baseband pooling feature
3.6.1 Extended baseband pooling of RRC-connected users changes to the system
Changes to the system introduced with the CB009265: Extended Baseband Pooling of RRC
-Connected Users feature
With the introduction of the CB009265: Extended Baseband Pooling of RRC-Connected Users
feature, you can configure the NRCELL Maximum number of users in a New Radio
cell (maxNumOfUsersPerNRCell) parameter to allow the support of 1500 UEs. This
increase applies to the ABIO capacity plug-in units, which use TDD and FDD frequency range 1
cells.
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4. 5G baseband pooling features
This section describes features introduced for the 5G baseband (BB) pooling using the frequency
range 1 (FR1) FDD and FR1 TDD configuration. The BB pooling functionality allows the available
resources to be dynamically distributed among cells and shared among all the cells allocated to a
particular pool.
4.1 5G baseband pooling features - TDD
5G baseband pooling features supported with the TDD.
With the baseband (BB) pooling, the resources of the capacity plug-in unit are divided into two
pools except for the ABIN capacity plug-in unit, where only one pool is used.
BB pooling is developed and dimensioned for the maximum supported number of cells per
capacity plug-in unit. For frequency range 1 (FR1) TDD, as per currently available configuration
options, this means that:
ABIO capacity plug-in unit can host up to 6 cells,
ABIP capacity plug-in unit can host up to 6 cells with the 8RX receiver and up to 12 cells with
the 4RX receiver.
Baseband resources are dynamically shared between the cells in each pool, but not shared
between the two pools, as this would overcomplicate the BB pooling algorithm. For the FR1 TDD,
this can lead to sub-optimal performance in the case of a three-cell deployment over two pools,
where one pool has an excess of resources while the other pool may experience a resource
shortage due to increased traffic demand.
When the BB pooling functionality is enabled, the positions of the Tracking Reference Signals
(TRS), CSI-RS for channel acquisition (ACQ), and CSI for Interference Measurement (IM) are
modified by the system to accommodate their simultaneous processing for the high number of
cells on the capacity plug-in unit. Therefore, there is a more varied distribution of TRS, CSI-RS for
ACQ, and CSI-IM across available slots network-wide. Cells are internally mapped to CSI RS pooling
groups and each pooling group is assigned a different downlink slot for CSI RS transmission. CSI
RS transmissions include reference symbols for both ACQ and IM. The cell mapping to CSI RS
pooling groups can change between gNB/cell restarts, because the pool allocation is affected by
the order of radio detection in the startup or by the order of operation between resets.
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Note:
If the cell mapping to CSI-RS pooling groups changes between gNB or cell restarts, it is
expected that the positions of TRS or CSI-RS can also change. This, in turn, may lead to
changes in the reported CQI values.
As a result, positions differ from the case when the BB pooling functionality is disabled. In the case
of mixed deployments, different positions can lead to a higher PDSCH interference from
neighboring TRS and CSI-RS in cell-edge conditions, leading to a higher DL Block Error Rate (BLER)
and subsequent DL throughput degradation. Therefore, Nokia recommends enabling the BB
pooling functionality network-wide.
Note:
When the BB pooling is enabled network-wide, interference can still occur if the ABIL
capacity plug-in unit is configured in the network. Interference can occur because the
5GC002093 Shared Real Time Baseband Resources - FR1 TDD feature doesn't modify
the TRS, CSI-RS ACQ, and CSI-RS IM positions as compared to the BB pooling algorithm on
ABIO and ABIP capacity plug-in units.
Note:
In environments affected by high-level inter-cell interference, the CB012269: CSI-RS
Allocation Optimization feature improves CQI measurement by measuring the inter-cell
interference through CSI-IM. Whether you should enable the CB012269 feature depends
on the dedicated scenario. For more information, see the CB012269 document.
Using the CB009363: 8RX IRC Receiver - ABIP/ABIQ FR1 TDD feature on the ABIP and ABIQ
capacity plug-in units increases the hardware processing demands, as the 8RX interference
rejection combining (IRC) receiver always processes eight UL MIMO streams per physical resource
block (PRB) for both single-user (SU) and multi-user (MU) MIMO scheduling. In comparison, the 4RX
IRC receiver processes either four UL MIMO streams for SU MIMO scheduling or eight UL MIMO
streams for MU MIMO scheduling.
Depending on the number of cells configured on the ABIP and ABIQ capacity plug-in units, the
chosen receiver per cell, the traffic demands per cell, and the resulting baseband resource sharing
through baseband pooling, the UL throughput can degrade in some cells using the 8RX receiver.
This is due to the PRB restriction applied from BB pooling at a high traffic load and the higher
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resource consumption of the 8RX receiver compared to the 4RX receiver.
Consider this imbalance for any performance comparison between 4RX and 8RX IRC receivers
beyond a single cell.
The only fair performance comparison between 4RX and 8RX IRC on the capacity plug-in unit level
is when the number of 4RX IRC receiver cells is twice the number of 8RX IRC receiver cells, for
example:
6 cells 4RX vs. 3 cell 8RX receiver
12 cells 4RX vs. 6 cell 8RX receiver
When TDD PRB pooling features—CB008940: Baseband Resource Pooling-FR1 TDD,
CB010513: Baseband Pooling—Extensions for FR1 TDD, and CB011028: Baseband Pooling Enhancements for FR1 TDD—are enabled, counter M55308C03002 PDCCH OFDM symbols
shows values higher than when these features are disabled. This is caused by changes in system
information block type 1 (SIB1) link adaptation. Before the CB008940 feature, UE-specific CSI-RS
weren't allowed in SIB1 slots. When the CB008940 feature is activated, the last two SIB1 symbols
are reserved for potential UE-specific CSI-RS. This reduces SIB1 link adaptation, which causes
counter M55308C03002 PDCCH OFDM symbols value to increase.
4.1.1 Shared real-time baseband resources - FR1 TDD
The 5GC002093: Shared Real Time Baseband Resources - FR1 TDD feature introduces
pooling of the MIMO layers and spatial stream processing for the frequency range 1 (FR1) TDD on
the ABIL capacity plug-in unit.
The 5GC002093 feature enables the pooling of layer 1 (L1) resources for processing MIMO layers
and spatial streams. Spatial stream processing allows for the allocation of additional MIMO layers
and spatial streams of resources, depending on the traffic needs of a specific cell. The
5GC002093 feature supports a higher number of downlink multi-user MIMOs (MU-MIMOs) layers
and introduces the pooling of resources for the ABIL capacity plug-in unit for FR1 TDD
deployments, both 5G SA and 5G NSA.
Without the 5GC002093 feature, downlink MU-MIMO can be fully supported only in deployments
with two NRCELLGRP objects per L1 instance.
The concept of MIMO layers and spatial stream processing resource sharing applies to the FR1
TDD ABIL capacity plug-in unit with an Enhanced Common Public Radio Interface (eCPRI) fronthaul
only.
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To share BB resources, all cells need to be configured with the same:
Subcarrier spacing
Frame pattern
NR cell type
Note:
The cell bandwidth restriction of the downlink MIMO mode is needed on the ABIL capacity
plug-in unit, but not on the ABIO capacity plug-in unit.
If one of the cells doesn't meet the listed conditions, either fault 7506 gNB CpRtCell
configuration update failure or 4602 5G cell configuration mismatch is
raised, and alarm 7114 CELL SERVICE PROBLEM is reported.
The 5GC002093 feature is activated with the NRBTS Activate TDD pre-pooling
(actTddPrePooling) parameter. The 5GC002093 needs to be activated together with the
CB008172 feature.
Note:
The cells can be configured either with different or the same center frequencies.
4.1.2 Baseband pooling of up to 8 DL MIMO layers - FR1 TDD
ABIO
The CB008172: Baseband Pooling of up to 8 DL MIMO Layers - FR1 TDD ABIO feature
introduces the baseband (BB) pooling functionality for 5G-capable radios using the frequency
range 1 (FR1) TDD configuration.
The CB008172 feature allows you to configure the 5GC002093: Shared Real Time Baseband
Resources - FR1 TDD feature on the ABIO capacity plug-in unit. When the 5GC002093 feature is
activated, the CB008172 feature uses the DL MIMO layers as additional resources across the cells
of a single ABIO capacity plug-in unit. Additionally, the CB008172 feature enables the DL MU
-MIMO configuration and frequency-division multiplexing for three cells per component carrier in
the 8-layer DL and 4-layer UL deployments, which was introduced with the CB006559: NR ABIO
BB Cell Sets 6 TDD Cells eCPRI 8DL feature. You can configure three cells with a bandwidth
from 60 up to 100 MHz per component carrier.
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The CB008172 feature is activated with the NRBTS Activate spatial stream
pooling (actSpatialStreamPooling) parameter. The CB008172 needs to be activated
together with the 5GC002093 feature.
Note:
Since the 23R3 release, Nokia recommends configuring the NRBTS Activate baseband
resource pooling FR1 TDD (actBbPoolTddFr1) parameter on the ABIO and ABIP
capacity plug-in units instead of the actSpatialStreamPooling parameter.
4.1.3 Baseband resource pooling-FR1 TDD
The CB008940: Baseband Resource Pooling-FR1 TDD feature introduces resources pooling
for the frequency range 1 (FR1) TDD cells on the ABIO and ABIN capacity plug-in units as well as on
the ASOE core unit with the Enhanced Common Public Radio Interface (eCPRI) fronthaul interface.
With the introduction of the CB008940 feature, you can allocate a higher number of cells by
enabling pooling of the following radio resources:
UEs scheduled per transmission time interval
RRC-connected UEs
UL and DL physical resource blocks (PRBs)
Note:
With the CB008940 feature enabled, the mix of super and pooling cells on the same
capacity plug-in unit isn't supported.
The CB008940 feature optimizes the layer 1 (L1) pool resources allocation to process the DL and
UL PRBs. With the CB008940 feature enabled, you can configure:
up to 6 FR1 TDD cells with bandwidth up to 100 MHz for the ABIO capacity plug-in unit and the
ASOE core unit.
up to 3 FR1 TDD cells with bandwidth up to 100 MHz for the ABIN capacity plug-in unit.
up to 8 DL and up to 4 UL layers per cell for the ABIO capacity plug-in unit, ASOE core unit, and
ABIN capacity plug-in unit.
up to 16 UEs per slot per cell and up to 1500 RRC-connected UEs per cell.
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Note:
The maximum number of RRC-connected UEs can't be reached for all the cells
simultaneously.
The CB008940 feature is enabled with the NRBTS Activate baseband resource
pooling FR1 TDD (actBbPoolTddFr1) parameter. With the CB008940 feature enabled,
multiple cells share the resources in the L1 pool instead of having dedicated resource allocation
for each cell.
Note:
When NR TDD cells within the same BB pool of a baseband unit are configured with
different frame structures, this is an unsupported configuration. This leads to the following
faults being raised:
For ABIO, ABIN, ASOE, ASOF fault 1868: BTS config error (Not enough HW
for LCR)
For ABIP, ABIQ, ASOG, ASOH fault 4282 (Configuration and HW mismatch)
The system maps cells to BB pools within the BB units based on the configured cell and
provided connections towards radio units.
With the actBbPoolTddFr1 parameter set to true, more than three cells can be deployed on
half of the ASOE core unit and half of the ABIP capacity plug-in unit when the following parameter
are configured:
The NRBTS Allow slow static NDM-SRS PRB pooling
(allowSlowPrbPoolingStatNdmSrs) parameter is set to true.
At least one of the following parameters is set to true:
NRCELL Activate downlink SRS based beam management(actDlSrsBm)
NRCELL Activate uplink SRS based beam management (actUlSrsBm)
In 25R1 release a change is introduced to allow processing of more than 6 cells with SRS-based
beamforming enabled per full ABIP capacity plug-in unit with
allowSlowPrbPoolingStatNdmSrs parameter set to false. The change allows to
configure the lower SRS periodicity which allows for a more accurate channel estimation and the
performance improvement of the CB008322 feature in the scenarios, where the setting of the
allowSlowPrbPoolingStatNdmSrs parameter to false was not possible due to the BB
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pooling requirements.
Note:
The 25R1 change to the allowSlowPrbPoolingStatNdmSrs parametrization rule is
applicable only to full ABIP capacity plug-in unit and NR FR1 TDD deployments with more
than 6 cells. Multi-RAT (Any RAT + NR TDD) is not supported in one ABIP when more than 3
NR TDD cells per ABIP capacity plug-in unit are configured
when allowSlowPrbPoolingStatNdmSrs parameter is set to false.
The CB008940 feature introduces the following counters:
M55115C03501: Admission Fail due to NSA UE Specific CSI-RS in
BBPOOL in DU
M55139C05501: Admission Fail due to SA UE Specific CSI-RS in
BBPOOL in DU
Note:
If the DL and UL multi-user MIMO (MU-MIMO) is enabled together with the DL and UL PRB
pooling, and the configured Control Resource Set (CORESET) size is more than 48 PRBs,
Nokia recommends setting the PDCCH Aggregation Level selection mode
(alSelection) parameter to dynamic to minimize the limitation of a physical downlink
control channel. The full CORESET size of PRBs can be unavailable when the PRB pooling
doesn't allocate a sufficient number of PRBs to a cell.
When you enable the CB008940 feature, compare the values of the following parameters with
the PUCCH Configuration tool:
NRCELL Requested minimum number of PUSCH PRBs (reqMinNumPuschPrb)
NRCELL Maximum number of users in a New Radio cell
(maxNumOfUsersPerNRCell)
NRCELL Number of radio resources reserved for emergency calls
(numOfRadioResReservForEmergency) if the NRCELL Activate emergency
calls handling (actEmergencyCall) parameter is set to true
NRCELL Number of radio resources reserved for temporary use
(numOfRadioResReservForTempUse) if the NRBTS Activate UE context
preemption (actUserPreemption) parameter is set to true
NRCELL Number of radio resources reserved for priority access
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(numOfRadioResReservForPa) if the NRCELL Activate priority access
(actPriorityAccess) parameter is configured and the NRBTS Apply priority
access (applyPriorityAccess) parameter isn't set to none
Note:
Any actions performed on those parameters cause an NR cell reset.
With the CB008940 feature, you can enable the enhanced PRB pooling algorithm in UL for
optimal PRB distribution functionality between cells when the UL MU-MIMO is enabled. In the 24R1
release, Bit 7 of the NRBTS Temporary activation flags 2 (tmpActFeat2)
parameter is used as a placeholder for the NRBTS Deactivate enhanced PRB pooling
UL MU-MIMO (deactEnhPrbPoolAlgoUlMuMimo) parameter, which is introduced in the
24R2 release. The functionality is activated by default, however, you can use the
deactEnhPrbPoolAlgoUlMuMimo parameter to deactivate the enhanced PRB pooling
algorithm in the UL for optimal distribution.
If the tmpActFeat2 parameter doesn't exist or Bit 7 equals 0, the enhanced PRB pooling
algorithm in UL for optimal PRB distribution functionality is activated. If Bit 7 equals 1, the
enhanced PRB pooling algorithm in the UL is deactivated. Any changes made to the Bit 7 trigger
a RAT reset.
Configuration for the semi-static and tdLte structure types with TDD PRB
pooling
When you enable the TDD PRB pooling for the below-mentioned frame structures with 6
synchronization signal blocks (SSBs), and the amount of other system information (OSI) is too
high, the gNB can't get enough slot resources for OSI and paging. considering SSB, tracking
reference signal, and channel state information reference signal.
For the semi-static frame structure type 1/4 with 6 SSB and TDD PRB pooling enabled, set the
following parameters to the recommended values:
NRCELL First PDCCH monitoring occasion of paging occasion
(fPdcchMonOccsnPo)—0
NRCELL Paging offset (pagingOffset)—3
Parameters under the PDCCH_CONFIG_COMMON Search space configuration for
common PDCCH (searchSpaceCommon) parameter structure:
PDCCH_CONFIG_COMMON Duration of the search space (duration)—3
PDCCH_CONFIG_COMMON Periodicity of the search space
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(periodicity)—sl20
PDCCH_CONFIG_COMMON Search space type (searchSpaceType)—Type2
PDCCH_CONFIG_COMMON Slot offset of the first PDCCH occasion
(slotOffset)—5
For the tdLte frame structure type—set with the NRCELL Frame Structure Type
(frameStructureType parameter under the NRCELL TDD frame structure
(tddFrameStructure) parameter structure—with 6 SSBs and TDD PRB pooling enabled, the
following conditions can apply:
The NRCELL LTE to NR frame shift (lteToNrFrameShift) parameter under the
NRCELL tddFrameStructure parameter structure is set to 0ms.
The NRCELL Number of paging frames in a DRX cycle (numOfPagingFrames)
parameter is set to halfT.
The 5GC002516: Coordination of TDD Deployments over Country Borders feature is
disabled, by setting the NRCELL Activate interfering TDD frame muting
(actInfTddFrameMuting) parameter to false
If the above conditions are met, set the following parameters under the
PDCCH_CONFIG_COMMON searchSpaceCommon parameter structure to the recommended
values:
NRCELL fPdcchMonOccsnPo—2
NRCELL pagingOffset—1
PDCCH_CONFIG_COMMON duration—4
PDCCH_CONFIG_COMMON periodicity—sl10
PDCCH_CONFIG_COMMON searchSpaceType—Type0A
PDCCH_CONFIG_COMMON slotOffset—6
Both solutions have no impact on KPIs.
Note:
For above configurations, Nokia doesn't recommend increasing the value of the
NRSYSINFO_PROFILE SI window length (siWindowLength) or
NRSYSINFO_PROFILE System Information target rate
(systemInformationTargetRate) parameters as it impacts coverage, delay, and
latency KPIs.
For the following configurations with 6 SSB and TDD PRB pooling enabled, the below-mentioned
legacy configurations without PRB pooling for physical downlink control channel apply:
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The semi-static frame structure type 3/7 with the 5GC002516: Coordination of TDD
Deployments over Country Borders feature disabled, by setting the NRCELL
actInfTddFrameMuting parameter to false.
The semi-static frame structure type 1/4 with the 5GC002516: Coordination of TDD
Deployments over Country Borders feature enabled, by setting the NRCELL
actInfTddFrameMuting parameter to true.
The tdLte frame structure type with the NRCELL lteToNrFrameShift parameter set to
0ms, the NRCELL numOfPagingFrames parameter set to halfT, and the 5GC002516:
Coordination of TDD Deployments over Country Borders feature enabled, by setting the
NRCELL actInfTddFrameMuting parameter to true.
The tdLte frame structure type with the NRCELL lteToNrFrameShift parameter set to
3ms, the NRCELL numOfPagingFrames parameter set to quaterT, the NRCELL
Activate Canada Wimax Interference Avoidance
(actCaWimaxInterferenceAvoidance) parameter set to true, and the 5GC002516:
Coordination of TDD Deployments over Country Borders feature disabled, by setting the
NRCELL (actInfTddFrameMuting) parameter to false.
The tdLte frame structure type with the NRCELL lteToNrFrameShift parameter set to
3ms, the NRCELL numOfPagingFrames parameter set to quaterT, the NRCELL
actCaWimaxInterferenceAvoidance parameter set to false, and the 5GC002516:
Coordination of TDD Deployments over Country Borders feature enabled, by setting the
NRCELL actInfTddFrameMuting parameter to true.
Note:
By increasing the system information block period or the value of the
NRSYSINFO_PROFILE siWindowLength parameter, the delay and latency KPIs can
increase. Nokia doesn't recommend increasing the value of the NRSYSINFO_PROFILE
systemInformationTargetRate parameter as it decreases the cell coverage KPIs.
Additionally, for all of the above configurations, set the NRSYSINFO_PROFILE SI window
length (siWindowLength) parameter to s160.
4.1.4 Baseband pooling—extensions for FR1 TDD
The CB010513: Baseband Pooling—Extensions for FR1 TDD feature improves capacity and
cell management for the ABIN and ABIO capacity plug-in unit and ASOE core unit for enhanced
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Common Public Radio Interface (eCPRI) and Common Public Radio Interface (CPRI) fronthaul
interfaces in the FR1 TDD deployment with a higher number of cells.
With the introduction of the CB010513 feature, you can enable baseband pooling together with
the following functionalities:
Slice-Aware Scheduler
VoNR
DL Interference Generation.
Coordination of TDD Deployments over Country Borders
The CB010513 feature supports the periodicity of 40 cell-specific slots for Channel State
Information Reference Signal (CSI-RS) for non-beamforming scenarios, which enables a
configuration of up to 1500 RRC-connected UEs on the ABIO and ABIN capacity plug-in units and
ASOE core unit. Such configuration is supported with TDD cell frame structure 1:4, 2:8, and 3:7.
Additionally, the CB010513 supports the 40 and 80 slots periodicity for the cell-specific CSI-RS in
beamforming scenarios.
You can enable the support of the higher number of RRC-connected UEs with the NRCELL CSI
reporting periodicity (csiReportPeriodicity) parameter.
For more information on the TDD frame structure, see NR radio frame in TDD mode.
The CB010513 feature is enabled with the NRBTS Activate baseband resource
pooling FR1 TDD extension (actBbPoolExtensionTddFr1) parameter.
With the CB010513 feature, you can prevent throughput degradation for cell sets with more
than three cells, where the remote interference management reference signal (RIM-RS) is enabled.
You can disable the RIM-RS with the NRBTS Activate disabling of NR remote
interference management RS at gNB level (actDisableNrRimRsAtGnbLevel)
parameter set to true.
4.1.5 Baseband pooling of up to 16 DL MIMO layers
The CB007112: Baseband Pooling of up to 16 DL MIMO Layers feature supports the
configuration of up to 16 DL MIMO layers in the frequency range 1 (FR1) TDD for the ABIO capacity
plug-in unit and ASOE core unit.
The CB007112 feature supports the configuration of up to 16 DL MIMO layers in the 3 FR1 TDD
cells deployment with each cell having bandwidth up to 100 MHz. The CB007112 feature needs
to be activated together with the CB008940: Baseband Resource Pooling - FR1 TDD feature
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using the NRBTS Activate large baseband resource pooling FR1 TDD
(actLargeBbPoolTddFr1) parameter.
Additionally, to fully benefit form the CB007112 feature, the NRCELL NR Cell type
(nrCellType) parameters needs to be set to one of the following values on at least two cells:
16DL4UL
16DL8UL
Note:
The value ranges of the nrCellType parameter refer to the number of MIMO fronthaul
streams of the cell. For the DL, the number of MIMO streams equals the number of MIMO
layers. For the UL, the number of MIMO streams is twice the number of MIMO layers.
The CB007112 feature is supported in the 5G SA option 2 and 5G NSA option 3x architectures.
4.1.6 Baseband pooling - enhancements for FR1 TDD
The CB011028: Baseband Pooling - Enhancements for FR1 TDD feature improves the
functionality introduced with the CB010513: Baseband Pooling—Extensions for FR1 TDD
feature by extending interworking of the supercell configurations. Additionally, the CB011028
feature improves the baseband pooling configuration with remote interference management
reference signals (RIM-RS).
The CB011028 feature extends interworking of the supercell configurations. With the CB011028
feature, each half of the capacity plug-in unit can be configured as follows:
A supercell with disabled baseband pooling
Cells with enabled baseband pooling
Additionally, the CB011028 feature supports the dynamic resource allocation for the RIM-RS,
which allows to identify the BTS affected by the atmospheric ducting phenomenon. The dynamic
resource allocation for the RIM-RS can prevent throughput degradation in the deployment with
more than three cells when the RIM-RS is enabled and the NRBTS Activate disabling of
NR remote interference management RS at gNB level
(actDisableNrRimRsAtGnbLevel) parameter is set to false.
With the CB0011028 feature enabled, the physical resource blocks (PRBs) from the layer 1 (L1)
pool capacity are reserved for each cell where RIM-RS is enabled. You can't configure RIM-RS in
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cells with a 10 Mhz bandwidth. For more information about RIM-RS, see the Remote interference
management framework-0 in the TDD Remote Interference Mitigation and Avoidance
document.
You can enable the CB011028 feature with the NRBTS Activate baseband resource
pooling FR1 TDD enhancements (actBbPoolTddFr1Enh) parameter.
The CB011028 feature introduces counter M55308C00091: Discarded Remote
Interference Management (RIM) transmissions. This counter is triggered when
RIM-RS transmissions are discarded from the lack of granted PRBs.
4.2 5G baseband pooling features - FDD
5G baseband pooling features supported with the FDD
4.2.1 Baseband pooling of scheduled UEs per slot - FDD
The CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD feature introduces the
pooling of UEs scheduled per slot for 5G-capable radio modules. Depending on your
configuration, you can deploy a higher number of FDD cells.
With the CB007114 feature, you can define the required deployment mode for FR1 FDD
configurations using the ABIO capacity plug-in unit or ASOE core unit. The deployment mode is
configured with the BBMOD FDD NR cell configuration tradeoff
(fddNrCellConfigTradeoff) parameter.
The following deployment scenarios are available, depending on the value of the
fddNrCellConfigTradeoff parameter:
If the parameter value is set to max cells, six cells with bandwidth up to 20 MHz are
deployed on half of the ABIO capacity plug-in unit and four cells on half of the ASOE core unit.
The max cells value is used to get a higher cell number (up to 12 cells per ABIO capacity
plug-in unit and up to 8 cells per ASOE core unit). This leads to a lower cell capacity (fewer RRC
-connected users).
If the parameter value is set to max capacity, three cells with bandwidth up to 30 MHz are
deployed on half of the ABIO capacity plug-in unit and two cells on half of the ASOE core unit.
The max capacity value is used to get a higher cell capacity (a higher number of RRC
-connected users). This leads to a lower number of NR FDD cells (up to 6 cells per ABIO
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capacity plug-in unit).
The CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD feature supports the BB
pooling of scheduled UEs per slot for FR1 FDD on the ABIO capacity plug-in unit and ASOE core
unit. The CB007114 feature supports a higher number of cells without decreasing the cell
-specific peak capacities. This feature is activated with the NRBTS Activate scheduled UE
per TTI pooling (actScheUePooling) parameter.
4.2.2 Baseband pooling of RRC-connected users - FDD
The 5GC002426: Baseband Pooling of RRC Connected Users - FDD feature introduces the
RRC pooling for 5G capable radio modules. Depending on configuration, you can allocate a higher
number of FDD cells.
With the 5GC002426 feature, you can define the required deployment mode for the frequency
range 1 (FR1) FDD configurations for the ABIO capacity plug-in unit as well as ASOE core unit. The
deployment mode is configured with the BBMOD FDD NR cell configuration tradeoff
(fddNrCellConfigTradeoff) parameter.
Depending on the value of the fddNrCellConfigTradeoff parameter, different deployment
scenarios are available. For more information, see Deployment scenarios.
The 5GC002426 feature increases the number of cells without decreasing the number of RRC
-connected users on the ABIO capacity plug-in unit and ASOE core unit.
To increase the number of cells without decreasing the maximum number of RRC-connected
users, the baseband processing capacity is pooled in one layer 1 (L1) and one layer 2 (L2) instance.
With the introduction of the 5GC002426 feature, the resources are divided into three parts:
Emergency resources, reserved for emergency calls
Guaranteed resources per cell
Shared resources used by all active cells
The 5GC002426 feature is activated with the NRBTS Activate baseband pooling of
RRC connected users (actConnRrcPooling) parameter.
This feature introduces counters that record the number of times the admission control failures
occur due to the unavailability of specific resources:
M55115C02501 Admission Fail due to NSA NR User in BBPOOL in DU
M55115C02502 Admission Fail due to NSA L2 DRB number in BBPOOL in
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DU
M55115C02503 Admission Fail due to NSA Periodic CSI in BBPOOL in
DU
M55115C02504 Admission Fail due to NSA SR in BBPOOL in DU
M55139C03501 Admission Fail due to SA L2 GBR number in BBPOOL in
DU
M55139C03502 Admission Fail due to SA NR User in BBPOOL in DU
M55139C03503 Admission Fail due to SA L2 DRB number in BBPOOL in
DU
M55139C03504 Admission Fail due to SA Periodic CSI in BBPOOL in DU
M55139C03505 Admission Fail due to SA SR in BBPOOL in DU
When you enable the 5GC002426 feature, compare the values of the following parameters with
the PUCCH Configuration tool:
NRCELL Requested minimum number of PUSCH PRBs (reqMinNumPuschPrb)
NRCELL Maximum number of users in a New Radio cell
(maxNumOfUsersPerNRCell)
NRCELL Number of radio resources reserved for emergency calls
(numOfRadioResReservForEmergency) if the NRCELL Activate emergency
calls handling (actEmergencyCall) parameter is set to true
NRCELL Number of radio resources reserved for temporary use
(numOfRadioResReservForTempUse) if the NRBTS Activate UE context
preemption (actUserPreemption) parameter is set to true
NRCELL Number of radio resources reserved for priority access
(numOfRadioResReservForPa) if the NRCELL Activate priority access
(actPriorityAccess) parameter is configured and the NRBTS Apply priority
access (applyPriorityAccess) parameter isn't set to none
Note:
Any actions performed on those parameters cause an NR cell reset.
4.2.3 Baseband pooling of PRBs - FR1 FDD
The 5GC001227: Baseband Pooling of PRBs - FR1 FDD feature introduces the UL and DL
physical resource block (PRB) pooling for the frequency range 1 (FR1) FDD bands, and enables
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support for a higher number of cells on the ABIO capacity plug-in unit and ASOE core unit. The
5GC001227 feature can be used together with the dynamic spectrum sharing (DSS)
functionality.
With the 5GC001227 feature, the PRBs are dynamically allocated to all commissioned cells inside
the pool. The PRB allocation is re-evaluated periodically based on the PRB utilization of each cell in
the pool. Each cell has a guaranteed minimum number of PRBs, which keeps it operational and
ensures proper working of common channels and signals.
The PRB pooling is applied to UL and DL PRBs, which are shared by cells of one pool, based on the
cell traffic load. The cell traffic load refers to the PRB utilization per cell in the pool. With the ABIO
capacity plug-in unit and the ASOE core unit, two pools are available per gNB. The cell traffic load
is assessed periodically for each cell in the pool for both UL and DL.
The feature is enabled with the NRBTS Activate slow PRB pooling
(actSlowPrbPooling) parameter. The 5GC001227 feature can be enabled on the gNB in the
5G SA and 5G NSA modes and NSA-SA in the concurrent mode configurations.
The feature uses the following counters to indicate the number of PRBs available for the physical
uplink shared channel (PUSCH) and the physical downlink shared channel (PDSCH):
M55308C10005: PRBs available for PDSCH with L1 baseband pooling
activated
This counter reflects PRBs available for the PDSCH and physical downlink control channel
(PDCCH).
M55308C10006: PRBs available for PUSCH with L1 baseband pooling
activated
This counter reflects PRBs available for the PUSCH.
PRB pooling and CQI
The 5GC001227 feature impacts the channel state information reference signal (CSI-RS). When
PRB pooling is enabled, the CSI-RS for channel acquisition is shifted to a different slot, which
impacts the channel quality indicator (CQI) measurement. Such a situation leads to a lower
interference in cells with enabled PRB pooling, which impacts the accuracy of CQI reported by the
UE. Once all the gNBs in the cluster are activated with PRB pooling and the cell count is close to a
supported maximum, both the interference and CQI values return to the pre-PRB pooling state.
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Note:
CSI-RS for channel acquisition periodicity is doubled when PRB pooling is enabled, resulting
in a less-precise CQI estimation for moving UEs.
DSS
The DSS functionality is supported in combination with the 5GC001227 feature. If the DSS
functionality is enabled, the NRCELL LTE-NR dynamic spectrum sharing mode
(lteNrDssMode) parameter needs to be set to DSS_Phase_3 and theNRDSSLTE Activate
rate matching for CSI-IM (actRateMatchedCsiIm) parameter needs to be set to
true. The PRB resource pooling in combination with the DSS is only applicable when all the cells
on the gNB are DSS-configured. All DSS cells need to be configured with the same cell bandwidth
and only 15 or 20 MHz bandwidths are allowed. Support for the DSS cells was extended with the
CB009158: PRB Pooling for FDD Cells - Enhancements feature, for more information, see
CB009158 feature.
4.2.3.1 Baseband pooling of PRBs - FR1 FDD configuration
aspects
The configuration aspects related to the 5G baseband pooling functionality
The following configuration aspects need to be considered when the 5GC001227: Baseband
Pooling of PRBs - FR1 FDD feature is enabled:
All cells on the gNB need to have the same cell bandwidth. Otherwise, alarm 1868: BTS
config error (Not enough HW for LCR) is raised.
All cells on the gNB need to be either dynamic spectrum sharing (DSS) only or non-DSS only.
Otherwise, alarm 1868: BTS config error (Not enough HW for LCR) is raised.
All DSS cells need to have either 15 or 20 MHz cell bandwidth.
The PRB blanking can't be used.
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Note:
With the 5GC001227 feature enabled, you need to adjust the physical downlink control
channel (PDCCH), as described in the recommended configuration. For more information,
see Single RAN>Reference Documentation>Product configurations>Adaptive PDCCH
Configuration Tool.
4.2.4 PRB pooling for FDD cells - enhancements
The CB009158: PRB Pooling for FDD Cells - Enhancements feature improves the physical
resource block (PRB) pooling functionality by providing more flexibility for FDD deployment.
The CB009158 feature removes limitations for the PRB pooling functionality restricted by the
5GC001227: Baseband Pooling of PRBs - FR1 FDD feature and supports the following:
The PRB pooling on the ABIO and ABIN capacity plug-in units
The PRB pooling on the dynamic spectrum sharing (DSS) cells on the ASOE core unit
The mixed cell bandwidth and mixed MIMO modes on the same ABIO and ABIN plug-in units,
and ASOE core unit
The PRB pooling with the DSS and PRB blanking
The PRB pooling deployment of DSS and non-DSS cells on the same ABIO and ABIN plug-in
units, and ASOE core unit
10 MHz bandwidth, extending the current capabilities of DDS cells with 15 and 20 MHz
bandwidths
Note:
If the DSS functionality is enabled, the NRCELL LTE-NR dynamic spectrum
sharing mode (lteNrDssMode) parameter needs to be set to DSS_Phase_3 and
the NRDSSLTE Activate rate matching for CSI-IM
(actRateMatchedCsiIm) parameter needs to be set to true
The PRB pooling in the 5G SA option 2 and 5G NSA option 3x architectures for the FDD
frequency range 1 (FR1) cells only
The configuration of the following features:
5GC002558: UL and DL PRB Blanking at Carrier Edge
5GC000526: DL Interference Generation - Single Cell
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5GC000431: Cell Switch-Off (Component Carrier) for Energy Efficiency
The CB009158 feature is activated with the same parameter as the 5GC001227 feature. By
enabling the 5GC001227 feature with the NRBTS Activate slow PRB pooling
(actSlowPrbPooling) parameter, you also enable the CB009158 feature. The CB009158
feature is disabled together with the 5GC001227 feature. For more information, see the
Activating 5GC001227 and CB009158 and Deactivating 5GC001227 and CB009158 procedures.
With the CB009158 feature enabled, you need to adjust the physical downlink control channel
(PDCCH), as described in the recommended configuration. For more information, see Reference
Documentation/Product configurations/Adaptive PDCCH Configuration Tool.
4.2.5 Extended baseband pooling of RRC-connected users
With the introduction of the CB009265: Extended Baseband Pooling of RRC-Connected Users
feature, you can configure up to 1500 RRC-connected UEs for the ABIO capacity plug-in unit using
a higher number of FDD cells.
Before the introduction of the CB009265 feature, the UE context memory was statically
allocated to each cell in the layer 2 real-time (L2-RT) instance. The L2-RT instance is located in the
gNB distributed unit in the AirScale capacity plug-in unit. Such an approach limits the number of
resources that can be used for the baseband (BB) pooling of the RRC-connected UEs, which
results in a limited number of RRC-connected users.
The CB009265 feature moves the UE context memory from the cells and allocates it to each L2
-RT instance. With the CB009265 feature, only one shared UE context memory serves multiple
cells. The shared UE context memory saves resources, which can be utilized for the BB pooling of
the RRC-connected UEs, resulting in a higher number of RRC-connected UEs.
The shared UE context memory has a mechanism for safe allocation, access, and release of the UE
context memory from the cells. The mechanism applies to all Nokia products in the frequency
range 1 (FR1) FDD and FR1 TDD configuration, except for the ABIL capacity plug-in unit.
The CB009265 feature is activated by default after the software upgrade to the 23R1 release.
You can configure up to 1500 RRC-connected users with the NRCELL Maximum number of
users in a New Radio cell (maxNumOfUsersPerNRCell) parameter.
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4.2.6 PRB pooling for FDD cells – concept refinement
The CB009215: PRB Pooling for FDD Cells – Concept Refinement feature enhances the
utilization of layer 1 (L1) processing resources for physical resource block (PRB) handling in DL and
UL for deployment with a higher number of cells.
Before the introduction of the CB009215 feature, a number of PRBs in the pool were reserved
for symbols carrying reference signals, and the remaining PRBs weren't shared among the cells in
the pool.
With the CB009215 feature, during resource pooling, single or multiple cells with the highest
traffic load are selected and assigned with reserved PRBs and remaining PRBs. As a result, such
cells can achieve their maximum throughput and prevent the cell throughput degradation due to
PRB pooling overhead.
With the CB009215 feature enabled, a cell with a bandwidth over 20 MHz or two cells with up to
20 MHz with the highest load achieve their maximum throughput.
You can activate the CB009215 feature with the NRBTS Activate slow PRB pooling
enhancements in FDD FR1 (actSlowPrbPoolingFddFr1Enh) parameter.
PDCCH configuration for DSS
The CB009215 feature introduces the recommended physical downlink control channel (PDCCH)
configuration for the phase 3 dynamic spectrum sharing (DSS) cells. However, only DSS phase 3
rate-matched cells are supported with the CB009215 feature. For more information on a PDCCH
configuration, see Reference Documentation/Product configurations/Adaptive PDCCH
Configuration Tool.
The CB009215 feature introduces the transient fault 4759: Verification of PDCCH
search space configuration needed for FDD DSS Cell, which is raised when a
PDCCH configuration for a particular cell needs to be adjusted. You can find this fault in the
Alarm History tab in Web Element Manager.
Automatic PRACH configuration index
The CB009215 feature introduces automatic physical random access channel (PRACH)
configuration index allocation for an FDD cell, which can be enabled with the NRBTS Activate
automated PRACH configuration index assignment in FDD FR1
(actAutoPrachConfigIndexFdd) parameter. With the automatic PRACH configuration index
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allocation enabled, the system checks the value of the NRCELL PRACH configuration
index (prachConfigurationIndex) parameter and decodes the PRACH format and
periodicity requested by the user. In case the initial configuration isn't valid and can't be set up,
the system can override user settings.
You can check the assigned PRACH configuration index value used by the system with the
NRCELL PRACH configuration index system value
(prachConfigurationIndexSys) parameter.
Note:
The automatic PRACH configuration index functionality isn't supported together with the
CB006912: NR ABIN BB cell sets 12 cells NR FDD CPRI and OBSAI feature.
Note:
You can enable the automatic PRACH configuration index functionality when the
CB009215 feature is deactivated.
With the CB009215 feature enabled and the automatic PRACH configuration index allocation
disabled, the PRACH configuration index needs to be manually adjusted using the NRCELL PRACH
configuration index (prachConfigurationIndex) parameter. During a manual PRACH
configuration, you need to ensure equal distribution of the PRACH groups for all the cells in the L1
pool.
Table 2: PRACH configuration recommendation
PRACH group
PRACH slot
prachConfigurationIndex
PRACH group 1
PRACH slot 1
8, 12, 36, or 40
PRACH group 2
PRACH slot 4
9, 13, 37, or 41
PRACH group 3
PRACH slot 7
10, 14, 38, or 42
PRACH group 4
PRACH slot 9
11, 15, 39, or 43
In case equal distribution of PRACH groups isn't possible, you need to add cells to the PRACH
groups in the following order:
PRACH group 2
PRACH group 3
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PRACH group 1
PRACH group 4
Note:
If the order of the cell addition to the PRACH groups isn't followed, the commissioning of
cells can lead to unsuccessful cell setup for some cells.
Table 3: Example of the recommended cell assignment to the PRACH groups
Cell
PRACH group
The first cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 2
The second cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 3
The third cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 1
The fourth cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 4
The fifth cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 2
The sixth cell
The index value of the
prachConfigurationIndex parameter
assigned to the PRACH group 3
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Note:
Due to the non-3GPP-compliant behavior regarding Type 1 PDCCH Search Space handling
of UEs based on some specific chipset vendor in the FDD DSS cells configuration with the
CB009215 feature enabled, such UEs can't connect to the cell due to the PRACH MSG2
failure. This behavior results from a different implementation of the 3GPP specification by
these UEs regarding the start of the random access response window during which the UE
expects to receive the PRACH MSG2.
The PRACH MSG2 failures for the non-3GPP-compliant UEs based on some specific chipset
vendor occur when:
the enhanced FDD PRB pooling is enabled.
at least 1 DSS cell is configured.
the prachConfigurationIndex parameter is set to 13 or 40. The
prachConfigurationIndex parameter can be configured either manually, with the
actAutoPrachConfigIndexFdd parameter set to false, or automatically due to
automated PRACH configuration functionality when the
actAutoPrachConfigIndexFdd parameter is set to true.
To prevent PRACH MSG2 failures for the above-mentioned UEs, Nokia recommends setting
the NRBTS Activate a fix for non-3GPP compliant random access
response window in specific vendor UEs for FDD DSS cells
(actFixNonCompRarWinFddDss) parameter to true. This parameter configuration
positions the random access response window so the above-mentioned UEs can
successfully receive PRACH MSG2. This solution applies to all UEs, and therefore you don't
need to identify such non-3GPP-compliant devices beforehand. In the 24R1 and 24R2
release, Bit 9 of the NRBTS Temporary activation flags 2 (tmpActFeat2)
parameter is used as a placeholder for the actFixNonCompRarWinFddDss parameter.
To prevent PRACH MSG2 failures for the non-3GPP-compliant UEs based on some specific
chipset vendor in the 24R1 and 24R2 releases, check Bit 9 of the tmpActFeat2
parameter. Checked Bit 9 corresponds to value true of the
actFixNonCompRarWinFddDss parameter.
If you set the NRBTS actFixNonCompRarWinFddDss parameter to false, you can't
configure the PRACH configuration indices 13 and 40, and you need to set the
actAutoPrachConfigIndexFdd parameter to false. This reduces the maximum
number of DSS cells on the ABIO capacity plug-in unit from 24 to 18.
When the CB009215 feature is enabled, the CSI-RS for channel acquisition periodicity is set to 20
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ms. Depending on the configuration before enabling the CB009215 feature and the configured
CSI-RS periodicity, this can lead to lower or higher UE CPU occupation for the CSI-RS measuring
and reporting procedure. Consequently, this can result in an increase or decrease in the number
of configured CSI-RS resources in secondary cells in carrier aggregation scenarios, as a
consequence the counters from M55308C22001 to M55308C22007 can be impacted.
Compatibility mode for enhanced slow PRB pooling in FDD FR1
To configure the compatibility mode for enhanced slow PRB pooling in FDD FR1, use the NRBTS
Slow PRB pooling FDD FR1 enhancement compatibility mode
(slowPrbPoolFddFr1EnhCompMode) parameter. Recommendations for the configuration of
this parameter are described in the Table:Configuration of the
slowPrbPoolFddFr1EnhCompMode parameter.
Table 4: Configuration of the slowPrbPoolFddFr1EnhCompMode parameter
Site to be configured
Neighbouring site
-
with the
actSlowPrbPoolingFddFr1
Enh parameter set to false
with the
actSlowPrbPoolingFddFr1
Enh parameter set to true
with the
actSlowPrbPoolingFddFr1
Enh parameter set to false
disabled
mute_slot_3_6_8
with the
actSlowPrbPoolingFddFr1
Enh parameter set to true
mute_slot_0_3_6_8
mute_slot_3_6_8
In a mixed HW setup where some FDD capacity plug-in units that support and have the PRB
pooling enabled while others don't, you should follow the recommended configuration with the
actSlowPrbPoolingFddFr1Enh parameter set to true.
This solution can reduce the values of the M55308C03001and M55308C03005 counters. This is
related to the lower number of symbols that are available for PDSCH. Moreover, the CQI value is
expected to increase after enabling the muting solution.
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5G Baseband Pooling
5. 5G baseband pooling reference data
A list of management data related to the 5G baseband (BB) pooling features: alarms, faults,
measurements, counters, key performance indicators (KPIs), and parameters
For reference data descriptions, see Reference Documentation/Reference document.
5.1 5G baseband pooling faults and alarms
A list of management data related to the 5G baseband (BB) pooling features: alarms and faults
BTS faults and reported alarms
Table 5: SRAN BTS faults related to the 5G BB pooling feature in the 22R1 release
Related
Fault ID
Fault name
Reported alarms
5GC002093
4602
5G cell configuration
mismatch
7114 CELL SERVICE
PROBLEM
5GC002093
7506
gNB CpRtCell
configuration update
failure
7114 CELL SERVICE
PROBLEM
feature
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Table 6: SRAN BTS faults related to the 5G BB pooling feature in the 24R1 release
Related
Fault ID
Fault name
Reported alarms
CB009215
1868
BTS configuration
error (not enough HW
for LCR)
7114 CELL SERVICE
PROBLEM, 7653 CELL
FAULTY
CB009215
4676
Duplicate PRACH
configuration index
7114 CELL SERVICE
PROBLEM
CB009215
4759
Verification of PDCCH
search space
configuration needed
for FDD DSS Cell
7115 BASE STATION
INFORMATION
feature
5.2 5G baseband pooling measurements, counters, and KPIs
A list of management data related to the 5G baseband (BB) pooling features: measurements,
counters, and key performance indicators (KPIs)
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5G Baseband Pooling
Measurements and counters
Table 7: SRAN BTS counters related to the 5G BB pooling features in the 22R2 release
Related
Counter ID
Counter name
Measurement
5GC002426,
CB007114
M55308C17001
Accumulated number of
scheduled (FDM and MU
-MIMO) UEs on PDSCH
per slot
NR Cell Utilization
5GC002426,
CB007114
M55308C17002
Maximum number of
scheduled (FDM and MU
-MIMO) UEs on PUSCH
per slot
NR Cell Utilization
5GC002426,
CB007114
M55308C18001
Accumulated number of
Scheduled (FDM and MU
-MIMO) UEs on PUSCH
per slot
NR Cell Utilization
5GC002426,
CB007114
M55308C18002
Maximum number of
Scheduled (FDM and MU
-MIMO) UEs on PUSCH
per slot
NR Cell Utilization
5GC002426,
CB007114
M55115C02501
Number of Admission
Fail due to NSA NR
User in BBPOOL in DU
Distributed unit (DU)
Radio admission
control measurement
5GC002426,
CB007114
M55115C02502
Number of Admission
Fail due to NSA L2 DRB
number in BBPOOL in DU
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55115C02503
Number of Admission
Fail due to NSA
Periodic CSI in BBPOOL
in DU
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55115C02504
Number of Admission
Fail due to NSA SR in
BBPOOL in DU
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55139C03501
Number of Admission
Fail due to SA L2 GBR
number in BBPOOL in DU
Standalone (SA)
Distributed unit (DU)
Radio Admission
Control measurement
feature
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Related
Counter ID
Counter name
Measurement
5GC002426,
CB007114
M55139C03502
Number of Admission
Fail due to SA NR User
in BBPOOL in DU
Standalone (SA)
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55139C03503
Number of Admission
Fail due to SA L2 DRB
number in BBPOOL in DU
Standalone (SA)
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55139C03504
Number of Admission
Fail due to SA
Periodic CSI in BBPOOL
in DU
Standalone (SA)
Distributed unit (DU)
Radio Admission
Control measurement
5GC002426,
CB007114
M55139C03505
Number of Admission
Fail due to SA SR in
BBPOOL in DU
Standalone (SA)
Distributed unit (DU)
Radio Admission
Control measurement
feature
Table 8: SRAN BTS counters related to the 5G BB pooling features in the 22R3 and 22R4 releases
Related
Counter ID
Counter name
Measurement
5GC001227,
CB009158
M55308C10005
PRBs available for
PDSCH with L1 baseband
pooling activated
NR Cell Utilization
5GC001227,
CB009158
M55308C10006
PRBs available for
PUSCH with L1 baseband
pooling activated
NR Cell Utilization
feature
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5G Baseband Pooling
Table 9: SRAN BTS counters related to the 5G BB pooling features in the 23R3 release
Related
Counter ID
Counter name
Measurement
CB008940
M55308C03002
PDCCH OFDM symbols
NR Cell Utilization
CB008940,
CB008305
M55308C34005
Number of PRBs for 2
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34006
Number of PRBs for 3
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34007
Number of PRBs for 4
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34008
Number of PRBs for 5
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34009
Number of PRBs for 6
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34010
Number of PRBs for 7
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB008940,
CB008305
M55308C34011
Number of PRBs for 8
-layer Tx for MU MIMO
in DL
NR Cell Utilization
CB007112
M55308C34012
Num of PRBs for non
paired UE tx for MU
MIMO in DL
NR Cell Utilization
CB007112
M55308C34013
Num of PRBs for 2 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
CB007112
M55308C34014
Num of PRBs for 3 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
feature
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Related
Counter ID
Counter name
Measurement
CB007112
M55308C34015
Num of PRBs for 4 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
CB007112,
CB008701
M55308C34016
Num of PRBs for 9
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34017
Num of PRBs for 10
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34018
Num of PRBs for 11
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34019
Num of PRBs for 12
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34020
Num of PRBs for 13
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34021
Num of PRBs for 14
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34022
Num of PRBs for 15
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112,
CB008701
M55308C34023
Num of PRBs for 16
layer tx for MU MIMO
in DL
NR Cell Utilization
CB007112
M55308C34024
Num of PRBs for 5 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
CB007112
M55308C34025
Num of PRBs for 6 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
feature
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5G Baseband Pooling
Related
Counter ID
Counter name
Measurement
CB007112
M55308C34026
Num of PRBs for 7 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
CB007112
M55308C34027
Num of PRBs for 8 UE
pair tx for MU MIMO in
DL
NR Cell Utilization
CB007112
M55308C34028
Total Number of MU
MIMO paired UEs for
PDSCH
NR Cell Utilization
CB007112
M55308C34029
Total number of MU
MIMO eligible UEs
scheduled on PDSCH
NR Cell Utilization
CB007112
M55308C35007
Number of PRBs for 2
UE pair Rx for MU MIMO
in UL
NR Cell Utilization
CB007112
M55308C35008
Number of PRBs for 3
UE pair Rx for MU MIMO
in UL
NR Cell Utilization
CB007112
M55308C35009
Number of PRBs for 4
UE pair Rx for MU MIMO
in UL
NR Cell Utilization
CB007112
M55308C35007
Num of PRBs for 2 UE
pair rx for MU MIMO in
UL
NR Cell Utilization
CB007112
M55308C35009
Num of PRBs for 4 UE
pair rx for MU MIMO in
UL
NR Cell Utilization
CB007112
M55308C35006
Number of PRBs for
non-paired UE Rx for
MU MIMO in UL
NR Cell Utilization
CB008940
M55115C03501
Admission Fail due to
NSA UE Specific CSI-RS
in BBPOOL in DU
Distributed unit (DU)
Radio admission control
measurement
feature
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Related
Counter ID
Counter name
Measurement
M55139C05501
Admission Fail due to
SA UE Specific CSI-RS
in BBPOOL in DU
Standalone (SA)
Distributed unit (DU)
Radio admission control
measurement
feature
CB008940
Table 10: SRAN BTS counters related to the 5G BB pooling feature in the 23R4 release
Related
Counter ID
Counter name
Measurement
CB010513
M55308C10005
Number of PRBs
available for PDSCH
with L1 baseband
pooling activated
NR Cell Utilization
CB010513
M55308C10006
Number of PRBs
available for PUSCH
with L1 baseband
pooling activated
NR Cell Utilization
CB010513
M55910C00001
DL PRBs used for
slice-aware scheduling
per resource group
NR cell utilization per NR
resource group for FR1
and FR2
CB010513
M55910C00002
Maximum DL PRB
utilization for slice
-aware scheduling per
resource group
NR cell utilization per NR
resource group for FR1
and FR2
feature
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5G Baseband Pooling
Table 11: SRAN BTS counters related to the 5G BB pooling feature in the 24R1 release
Related
Counter ID
Counter name
Measurement
CB011028
M55308C10001
PRBs used for PDSCH
NR Cell Utilization
CB011028
M55308C10005
Number of PRBs
available for PDSCH
with L1 baseband
pooling activated
NR Cell Utilization
CB011028
M55308C00091
Discarded Remote
Interference
Management (RIM)
transmissions
NR Cell Utilization
CB009215
M55308C00001
Sum of DL Data slots
NR Cell Utilization
CB009215
M55308C03001
Number of PDSCH OFDM
symbols
NR Cell Utilization
CB009215
M55308C03005
Time of PDSCH OFDM
symbols
NR Cell Utilization
CB009215
M55332C02001
Total number of
available DL Slots
NR EN DSS per NR cell
CB009215
M55335C02004
Number of slots with
downlink grant
capability in Cell
BWP-0
NR PDCCH usage
CB009215
M55335C05004
Number of slots with
downlink grant
capability in Cell
BWP-1
NR PDCCH usage
CB009215
M55335C08004
Number of slots with
downlink grant
capability in Cell
BWP-2
NR PDCCH usage
CB009215
M55335C11004
Number of slots with
downlink grant
capability in Cell
BWP-3
NR PDCCH usage
feature
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Related
Counter ID
Counter name
Measurement
CB009215
M55335C14004
Number of slots with
downlink grant
capability in Cell
BWP-4
NR PDCCH usage
CB009215
M55335C17004
Number of slots with
downlink grant
capability in Cell
BWP-5
NR PDCCH usage
CB009215
M55335C20004
Number of slots with
downlink grant
capability in Cell
BWP-6
NR PDCCH usage
CB009215
M55335C23004
Number of slots with
downlink grant
capability in Cell
BWP-7
NR PDCCH usage
CB009215
M55335C26004
Number of slots with
downlink grant
capability in Cell
BWP-8
NR PDCCH usage
CB009215
M55335C29004
Number of slots with
downlink grant
capability in Cell
BWP-9
NR PDCCH usage
feature
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5G Baseband Pooling
KPIs
Table 12: SRAN BTS KPIs related to the 5G BB pooling features in the 22R2 release
Related
KPI ID
KPI name
5GC002426,
CB007114
NR_5112
5G Average number of scheduled UEs in DL
5GC002426,
CB007114
NR_5113
5G Average number of scheduled UEs in UL
5GC002426,
CB007114
NR_5128
5G SA Average number of SA RRC connected
users in selected area
5GC002426,
CB007114
NR_5129
5G SA Maximum number of SA RRC connected
users
feature
Table 13: SRAN BTS KPIs related to the 5G BB pooling feature in the 22R3 release
Related
KPI ID
KPI name
5GC001227
NR_5258
5G Maximum MAC SDU Cell throughput in DL on
DTCH
5GC001227
NR_5259
5G Maximum MAC SDU Cell throughput in UL on
DTCH
feature
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Table 14: SRAN BTS KPIs related to the 5G BB pooling feature in the 22R4 release
Related
KPI ID
KPI name
CB009158
NR_5100
5G Average MAC layer user throughput in
downlink
CB009158
NR_5101
5G Average MAC layer user throughput in
uplink
CB009158
NR_5114
5G PRB utilization for PDSCH
CB009158
NR_5115
5G PRB utilization for PUSCH
CB009158
NR_5258
5G Maximum MAC SDU Cell Throughput in DL on
DTCH
CB009158
NR_5259
5G Maximum MAC SDU Cell Throughput in UL on
DTCH
feature
Table 15: SRAN BTS KPIs related to the 5G BB pooling feature in the 23R1 release
Related
KPI ID
KPI name
CB009265
NR_5124
5G NSA Average number of NSA users in
selected area
CB009265
NR_5125
5G NSA Maximum number of NSA users per cell
CB009265
NR_5128
5G SA Average number of SA RRC connected
users in selected area
CB009265
NR_5129
5G SA Maximum number of SA RRC connected
users
feature
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Table 16: SRAN BTS KPIs related to the 5G BB pooling feature in the 23R3 release
Related
KPI ID
KPI name
CB008940,
CB007112
NR_70
5G Average PDCP SDU delay in DL
CB008940,
CB007112
NR_71
5G Average PDCP SDU delay in UL
CB008940,
CB007112
NR_5085
5G NSA PDCP SDU throughput (without
repetitions) in UL
CB008940,
CB007112
NR_5088
5G MAC PDU Cell throughput on active PDSCH
data slots on initial HARQ transmissions
CB008940,
CB007112
NR_5089
5G MAC PDU Cell throughput on active PUSCH
data slots on initial HARQ transmissions
CB008940,
CB007112
NR_5090
5G Active cell MAC PDU throughput on PDSCH
on initial HARQ transmissions
CB008940,
CB007112
NR_5091
5G Active cell MAC PDU throughput on PUSCH
on initial HARQ transmissions
CB007112
NR_5095
5G SA PDCP SDU throughput in uplink
CB007112
NR_5125
5G NSA Maximum number of NSA users per cell
CB007112
NR_5129
5G SA Maximum number of SA RRC users
CB007112
NR_5247
5G Average number of users per cell
CB007112
NR_5258
5G Maximum MAC SDU Cell Throughput in DL on
DTCH
CB007112
NR_5259
5G Maximum MAC SDU Cell Throughput in UL on
DTCH
feature
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Table 17: SRAN BTS KPIs related to the 5G BB pooling feature in the 23R4 release
Related
KPI ID
KPI name
CB010513
NR_578
5G MAC PDU Cell throughput on PDSCH
considering the accumulated time of frames
with data slots used for PDSCH
CB010513
NR_5084
5G SA PDCP SDU throughput in downlink
CB010513
NR_5094
5G SA PDCP SDU throughput in downlin
CB010513
NR_5100
5G Average MAC layer user throughput in
downlink
CB010513
NR_5124
5G NSA Average number of NSA users in
selected area
CB010513
NR_5128
5G SA Average number of SA RRC connected
users in selected area
CB010513
NR_5242
5G Achievable MAC PDU Cell throughput on
PDSCH considering PRB utilization
CB010513
NR_5244
5G Scheduled user throughput in downlink
considering PRB utilization
feature
5.3 5G baseband pooling parameters
A list of management data related to the 5G baseband (BB) pooling features: parameters
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5G Baseband Pooling
Parameters
Table 18: SRAN BTS parameters related to the 5G BB pooling feature in the 22R1 release
Related
Full name
Abbreviated name
Path
5GC002093
Activate spatial
stream pooling
actSpatialStreamPoo
ling
MRBTS/NRBTS
5GC002093
Activate TDD pre
-pooling
actTddPrePooling
MRBTS/NRBTS
CB008172
Activate spatial
stream pooling
actSpatialStreamPoo
ling
MRBTS/NRBTS
CB008172
Activate enhanced
frequency domain
scheduling
actFdmEnhancedSched
uling
MRBTS/NRBTS
CB008172
Activate frequency
domain scheduling
actFdmScheduling
MRBTS/NRBTS
CB008172
NR Cell type
nrCellType
MRBTS/NRBTS
CB008172
Activate
Beamforming
actBeamforming
MRBTS/NRBTS
CB008172
Number of Rx
beamforming
numberOfRxBeamformi
ng
MRBTS/NRBTS
CB008172
PUCCH mode
selection
pucchModeSelect
MRBTS/NRBTS
CB008172
Number of sub
-sectors
numOfSubSectors
MRBTS/NRBTS/NRCELL
CB008172
Basic Beam Set
basicBeamSet
MRBTS/NRBTS/NRCELL
CB008172
BTS Beam Refinement
P2
nrBtsBeamRefinement
P2
MRBTS/NRBTS/NRCELL/bea
mSet
CB008172
Number of
transmitted
Synchronization
Signal Blocks
numberOfTransmitted
SsBlocks
MRBTS/NRBTS/NRCELLGRP
feature
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Table 19: SRAN BTS parameters related to the 5G BB pooling features in the 22R2 release
Related
Full name
Abbreviated name
Path
5GC002426,
CB007114
FDD NR cell
configuration
tradeoff
fddNrCellConfigTrad
eoff
EQM/APEQM/CABINET/BBM
OD
5GC002426,
CB007114
Activate frequency
domain scheduling
actFdmScheduling
MRBTS/NRBTS
5GC002426,
CB007114
Activate scheduled
UE per TTI pooling
actScheUePooling
MRBTS/NRBTS
5GC002426,
CB007114
Activate baseband
pooling of RRC
connected users
actConnRrcPooling
MRBTS/NRBTS
5GC002426,
CB007114
Maximum number of
PDSCH allocation
per slot
maxNumPdschAllocati
onPerSlot
MRBTS/NRBTS/NRCELL
5GC002426,
CB007114
Maximum number of
PUSCH allocation
per slot
maxNumPuschAllocati
onPerSlot
MRBTS/NRBTS/NRCELL
5GC002426,
CB007114
PUCCH mode
selection
pucchModeSelect
MRBTS/NRBTS/NRCELL
feature
Table 20: SRAN BTS parameters related to the 5G BB pooling feature in the 22R3 release
Related
Full name
Abbreviated name
Path
5GC001227
Activate
baseband pooling
of RRC connected
users
actConnRrcPooling
MRBTS/NRBTS
5GC001227
Activate
scheduled UE per
TTI pooling
actScheUePooling
MRBTS/NRBTS
5GC001227
Activate slow
PRB pooling
actSlowPrbPooling
MRBTS/NRBTS
feature
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Table 21: SRAN BTS parameters related to the 5G BB pooling feature in the 22R4 release
Related
Full name
Abbreviated name
Path
CB009158
Activate
baseband pooling
of RRC connected
users
actConnRrcPooling
MRBTS/NRBTS
CB009158
Activate
scheduled UE per
TTI pooling
actScheUePooling
MRBTS/NRBTS
CB009158
Activate slow
PRB pooling
actSlowPrbPooling
MRBTS/NRBTS
CB009158
Activate NR
load-based power
saving
actNrLBPowerSaving
MRBTS/NRBTS
CB009158
Activate PRB
blanking
actPRBBlanking
MRBTS/NRBTS/NRCELL
CB009158
Target total
load with
artificial load
targetTotalLoad
MRBTS/NRBTS/NRCELL
CB009158
Activate
asymmetric
bandwidth
guardband
actAsymBwGuardband
MRBTS/NRBTS/NRCELL/NRCE
LL_FDD
feature
Table 22: SRAN BTS parameters related to the 5G BB pooling feature in the 23R1 release
Related Feature
Full name
Abbreviated name
Path
CB009265
Maximum number of
users in a New
Radio cell
maxNumOfUsersPerNRCe
ll
MRBTS/NRBTS/NRCEL
L
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Table 23: SRAN BTS parameters related to the 5G BB pooling feature in the 23R3 release
Related
Full name
Abbreviated name
Path
CB008940
Activate baseband
resource pooling
FR1 TDD
actBbPoolTddFr1
MRBTS/NRBTS
CB007112,
CB008940
Activate large
baseband resource
pooling FR1 TDD
actLargeBbPoolTddFr
1
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate downlink
MU MIMO enhancement
actDlMuMimoEnh
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate UL MU-MIMO
actUlMuMimo
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
NR Cell type
nrCellType
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Maximum number of
users in a New
Radio cell
maxNumOfUsersPerNRC
ell
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Maximum number of
PUSCH allocation
per slot
maxNumPuschAllocati
onPerSlot
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Maximum number of
PDSCH allocation
per slot
maxNumPdschAllocati
onPerSlot
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate slice
aware scheduler in
DL
actSliceAwareSchedu
ler
MRBTS/NRBTS
CB007112,
CB008940
Allow slow static
NDM-SRS PRB pooling
allowSlowPrbPooling
StatNdmSrs
MRBTS/NRBTS
CB007112,
CB008940
Activate cell CSI
-RS/IM for TDD non
beamforming
actCellCsiRsImTddNo
nBf
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate cell
specific CSI-RS for
FR1 TDD cell based
on SSB beamforming
actCellCsirsTddOnSs
bBf
MRBTS/NRBTS/NRCELL
Feature
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5G Baseband Pooling
Related
Full name
Abbreviated name
Path
CB007112,
CB008940
Activate multiple
CSI-RS resources
multiplexing in
slot
actCsirsMultiplexin
g
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate DL MU-MIMO
actDlMuMimo
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate GBR
services support in
the NR cell
actNonVoNRGbrServic
e
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
Activate super cell
actSuperCell
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
CSI-RS Tracking
Period
csirsTrackingPeriod
MRBTS/NRBTS/NRCELL/cs
irsForTracking
CB007112,
CB008940
CSI reporting
periodicity
csiReportPeriodicit
y
MRBTS/NRBTS/NRCELL/pe
riodicCsiAcquisitio
n
CB007112,
CB008940
Number of CSI-RS
resource period in
one CSI report
period
csirsNumberWithinRe
portPeriod_Set1
MRBTS/NRBTS/NRCELL/pe
riodicCsiAcquisitio
n
CB007112,
CB008940
PUCCH mode
selection
pucchModeSelect
MRBTS/NRBTS/NRCELL
CB007112,
CB008940
SS Burst Set Period
ssBurstSetPeriod
MRBTS/NRBTS/NRCELLGRP
Feature
Note:
For the ABIQ capacity plug-in unit, when the 8RX IRC receiver is used (the
NRCELLnumberOfRxBeamforming parameter is set to 8RX) for any of the cells
configured on the capacity plug-in unit, set the NRBTSactLargeBbPoolTddFr1
parameter to true.
If the NRBTSactLargeBbPoolTddFr1 parameter is set to false, you can't set up any
cells with 8RX IRC receiver on the ABIQ capacity plug-in unit, and fault 4282
Configuration and hardware mismatch is raised.
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Table 24: SRAN BTS parameters related to the 5G BB pooling feature in the 23R4 release
Related
Full name
Abbreviated name
Path
CB010513
Activate baseband
resource pooling
FR1 TDD extension
actBbPoolExtensionT
ddFr1
MRBTS/NRBTS
CB010513
Activate baseband
resource pooling
FR1 TDD
actBbPoolTddFr1
MRBTS/NRBTS
CB010513
Activate disabling
of NR remote
interference
management RS at
gNB level
actDisableNrRimRsAt
GnbLevel
MRBTS/NRBTS
CB010513
Activate slice
aware scheduler in
DL
actSliceAwareSchedu
ler
MRBTS/NRBTS
CB010513
Activate explicit
TRS CSI-RS pooling
solution
actExplicitCsirsPoo
lSolution
MRBTS/NRBTS
CB010513
Activate cell CSI
-RS/IM for TDD non
beamforming
actCellCsiRsImTddNo
nBf
MRBTS/NRBTS/NRCELL
CB010513
Activate cell
specific CSI-RS for
FR1 TDD cell based
on SSB beamforming
actCellCsirsTddOnSs
bBf
MRBTS/NRBTS/NRCELL
CB010513
Activate DL MU-MIMO
actDlMuMimo
MRBTS/NRBTS/NRCELL
CB010513
Activate GBR
services support in
the NR cell
actNonVoNRGbrServic
e
MRBTS/NRBTS/NRCELL
CB010513
Activate NR remote
interference
management
actNrRim
MRBTS/NRBTS/NRCELL
CB010513
Activate short BSR
limit adaptation
actShortBsrLimitAda
ptation
MRBTS/NRBTS/NRCELL
CB010513
Activate super cell
actSuperCell
MRBTS/NRBTS/NRCELL
feature
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Related
Full name
Abbreviated name
Path
CB010513
Maximum number of
PDSCH allocation
per slot
maxNumPdschAllocati
onPerSlot
MRBTS/NRBTS/NRCELL
CB010513
PUCCH mode
selection
pucchModeSelect
MRBTS/NRBTS/NRCELL
CB010513
Target total load
with artificial
load
targetTotalLoad
MRBTS/NRBTS/NRCELL
CB010513
CSI-RS Tracking
Period
csirsTrackingPeriod
MRBTS/NRBTS/NRCELL/cs
irsForTracking
CB010513
UL to DL logical
data slot ratio
ulDlDataSlotRatio
MRBTS/NRBTS/NRCELL/td
dFrameStructure
CB010513
Interfering UL to
DL logical data
slot ratio
infUlDlDataSlotRati
o
MRBTS/NRBTS/NRCELL/in
fTddFrameStructure
CB010513
SS Burst Set Period
ssBurstSetPeriod
NRBTS/NRCELLGRP
feature
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Table 25: SRAN BTS parameters related to the 5G BB pooling feature in the 24R1 release
Related
Full name
Abbreviated name
Path
CB011028
Activate baseband
resource pooling
FR1 TDD
enhancements
actBbPoolTddFr1Enh
MRBTS/NRBTS
CB009215
Activate automated
PRACH configuration
index assignment in
FDD FR1
actAutoPrachConfigI
ndexFdd
MRBTS/NRBTS
CB009215
Activate LTE-NR
dynamic spectrum
sharing
actLteNrDss
MRBTS/NRBTS
CB009215
Activate slow PRB
pooling
actSlowPrbPooling
MRBTS/NRBTS
CB009215
Activate slow PRB
pooling
enhancements in FDD
FR1
actSlowPrbPoolingFd
dFr1Enh
MRBTS/NRBTS
CB009215
Activate short BSR
limit adaptation
actShortBsrLimitAda
ptation
MRBTS/NRBTS
CB008940
Activate enhanced
algorithm of
baseband resource
pooling FR1 TDD
actBbPoolTddFr1AlgE
nh
MRBTS/NRBTS
CB010513
Activate explicit
TRS CSI-RS pooling
solution
actExplicitCsirsPoo
lSolution
MRBTS/NRBTS
CB009215
Activate a fix for
non-3GPP compliant
random access
response window in
specific vendor UEs
for FDD DSS cells
actFixNonCompRarWin
FddDss
MRBTS/NRBTS
CB009215
PRACH configuration
index
prachConfigurationI
ndex
MRBTS/NRBTS/NRCELL/
CB009215
PRACH configuration
index system value
prachConfigurationI
ndexSys
MRBTS/NRBTS/NRCELL/
feature
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Related
Full name
Abbreviated name
Path
CB009215
CSI-RS Tracking
Period
csirsTrackingPeriod
MRBTS/NRBTS/NRCELL/cs
irsForTracking
CB009215
CSI reporting
periodicity
csiReportPeriodicit
y
MRBTS/NRBTS/NRCELL/pe
riodicCsiAcquisitio
n
CB009215
Flexible 5G FR1
carrier aggregation
mode
flexibleCAMode
MRBTS/NRBTS/NRDU
feature
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6. Activating and deactivating 5G baseband pooling
Activation and deactivation procedures for the 5G baseband (BB) pooling features
6.1 Activating and deactivating TDD 5G baseband pooling
features
Activation and deactivation procedures related to TDD 5G baseband pooling features.
If the PRB pooling is enabled, there can be less physical downlink shared channel (PDSCH)
interference to Channel State Information Reference Signal (CSI-RS) for Channel Measurements
due to symbols without PDSCH allocation, resulting in the overestimated Channel Quality Indicator
(CQI) measured by the UE.
You can configure the following parameters to achieve the optimal CQI for the UE in link
adaptation and scheduling:
NRCELL Delta CQI minimum of DL OLLA for high reliability
(NRCELL.pdschHrLaConfig.dllaDeltaCqiMinHR)
NRCELL Delta CQI maximum of DL OLLA for high reliability
(NRCELL.pdschHrLaConfig.dllaDeltaCqiMaxHR)
6.1.1 Activating full board BBP mechanism with enhanced
instantaneous UL capacity
Activation procedure for full board BBP mechanism for ABIP capacity plug-in unit supporting the
enhanced instantaneous UL capacity.
For best UL performance, it is highly recommended to use the 8RX IRC receiver as per feature
CB009363.
Procedure for cells with 16DL 4UL Layers on Full ABIP
1. BBMOD.bbmodBoardConfigType must be set for either NRTDD or Auto value.
2. NRCELL.nrCellType must utilize 16 DL MIMO layers, meaning it is configured for
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5G Baseband Pooling
‘16DLxUL’, where x can be configured for any supported value.
Procedure for cells with up to 8DL 4UL Layers on Full ABIP
1. BBMOD.bbmodBoardConfigType must be set for NRTDD_FullboardMode value.
6.1.2 Activating 5GC002093 and CB008172
Activation procedure for the 5GC002093: Shared Real Time Baseband Resources - FR1 TDD
and CB008172: Baseband Pooling of up to 8 DL MIMO Layers - FR1 ABIO features
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a gNB reset. Activating the configuration plan triggers this action on the gNB side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate spatial stream pooling
(actSpatialStreamPooling) parameter to true.
Path: MRBTS›NRBTS
Note:
Since the 23R3 release, Nokia recommends configuring the NRBTS Activate
baseband resource pooling FR1 TDD (actBbPoolTddFr1) parameter on
the ABIO and ABIP capacity plug-in units instead of the
actSpatialStreamPooling parameter.
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3
Set the NRBTS Activate TDD pre-pooling (actTddPrePooling) parameter to
true.
Note:
The 5GC002093 needs to be enabled on ABIL capacity plug-in unit. The CB008172
needs to be enabled for the ABIO capacity plug-in unit and ASOE core unit. Both
features use the same activation parameter.
Path: MRBTS›NRBTS
Result
With the TDD pre-pooling and the spatial stream pooling enabled, you can configure the
5GC002093 and CB008172 features.
6.1.3 Deactivating 5GC002093 and CB008172
Activation procedure for the 5GC002093: Shared Real Time Baseband Resources - FR1 TDD
and CB008172: Baseband Pooling of up to 8 DL MIMO Layers - FR1 ABIO features
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a gNB reset. Activating the configuration plan triggers this action on the gNB side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate spatial stream pooling
(actSpatialStreamPooling) parameter to false.
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5G Baseband Pooling
Path: MRBTS›NRBTS
3
Set the NRBTS Activate TDD pre-pooling (actTddPrePooling) parameter to
false.
Path: MRBTS›NRBTS
Result
With the TDD pre-pooling and the spatial stream pooling is disabled, you can't configure the
5GC002093 and CB008172 features.
6.1.4 Configuring 5GC002093 and CB008172
An example of configuration procedure for the CB008172: Baseband Pooling of up to 8 DL
MIMO Layers - FR1 TDD ABIO and 5GC002093: Shared Real Time Baseband Resources FR1 TDD features
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure the BTS is configured with the A5G-TD-3S-1CC-8DL-4UL-FR1-Enhanced Common
Public Radio Interface profile on half of ABIO capacity plug-in unit. For more information, see:
Reference Documentation/5G and SRAN Supported Configuration/SBTS and gNB
Supported Configurations/gNB Supported Configurations.
Make sure that the 5GC002093 and CB008172 features are enabled. For more information,
see Activating 5GC002093 and CB008172.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a gNB reset. Activating the configuration plan triggers this action on the gNB side.
Procedure
1
80
Go to Parameter Editor.
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2
Set the NRBTS Activate enhanced frequency domain scheduling
(actFdmEnhancedScheduling) parameter value to true.
Path: MRBTS›NRBTS
3
Set the NRBTS Activate frequency domain scheduling (actFdmScheduling)
parameter to true.
Path: MRBTS›NRBTS
4
Set the NRCELL NR Cell type (nrCellType) parameter to 8DL4UL.
Path: MRBTS›NRBTS›NRCELL
The Number of sub-sectors (numOfSubSectors) parameter needs to be set to
0sub-sector.
5
Set the NRCELL Activate Beamforming (actBeamforming) parameter to true.
Path: MRBTS›NRBTS›NRCELL
The NRCELL Basic Beam Set (basicBeamSet) parameter needs to be configured.
6
Set the NRCELL BTS Beam Refinement P2 (nrBtsBeamRefinementP2) parameter
to true under the Beam Set (beamSet) parent parameter structure.
Path: MRBTS›NRBTS›NRCELL
7
Set the NRCELL Number of Rx beamforming (numberOfRxBeamforming)
parameter to 4Rx.
Path: MRBTS›NRBTS›NRCELL
The NRCELLGRP Number of transmitted Synchronization Signal Blocks
(numberOfTransmittedSsBlocks) parameter needs to be set to a value different than
1 beam.
8
Set the NRCELL PUCCH mode selection (pucchModeSelect) parameter to
longPucch.
Path: MRBTS›NRBTS›NRCELL
Result
The baseband pooling of the MIMO layers in the 8-layer DL and 4-layer UL deployment
configuration is enabled.
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5G Baseband Pooling
6.1.5 Pre-configurating CB008940
This procedure describes step-by-step action necessary for the pre-configuration of the
CB008940: Baseband Pooling of PRB - FR1 TDD feature.
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that BTS has frequency range 1 (FR1) TDD cells configured.
The following parameters need to be configured before configuring the network for the
activation of the CB008940
Table 26: Prerequisite parameter settings for the pre-configuration of the CB008940 feature
Path
Parameter
Setting
MRBTS/NRBTS/NRCELL
Activate cell CSI-RS/IM for TDD
non beamforming
(actCellCsiRsImTddNonBf)
false
MRBTS/NRBTS/NRCELL
Activate cell specific CSI-RS
for FR1 TDD cell based on SSB
beamforming
(actCellCsirsTddOnSsbBf)
false
MRBTS/NRBTS/NRCELL
Activate DL MU-MIMO (actDlMuMimo)
false
MRBTS/NRBTS/NRCELL
Activate GBR services support
in the NR cell
(actNonVoNRGbrService)
false
MRBTS/NRBTS/NRCELL
Activate super cell
(actSuperCell)
false
MRBTS/NRBTS
Activate slice aware scheduler
(actSliceAwareScheduler)
false
Modifying the settings of the parameters used in this procedure interrupts service availability
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through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate frequency domain scheduling (actFdmScheduling)
parameter to true.
Object path: MRBTS›NRBTS
3
Set the NRCELL Activate increased frequency domain multiplexed users
per slot (actIncreasedFdmUsersPerSlot) parameter to true.
Object path: MRBTS›NRBTS›NRCELL
4
Set the NRCELL Maximum number of PDSCH allocation per slot
(maxNumPdschAllocationPerSlot) parameter to 16.
Object path: MRBTS›NRBTS›NRCELL
5
Set the NRCELL Maximum number of PUSCH allocation per slot
(maxNumPuschAllocationPerSlot) parameter to 16
Object path: MRBTS›NRBTS›NRCELL
6
Set the NRCELL Activate multiple CSI-RS resources multiplexing in
slot (actCsirsMultiplexing) parameter to true.
Note:
The actcsiRsMultiplexing parameter needs to be set to true when the
NRCELL Downlink MIMO Mode (dlMimoMode) parameter is set to 8x4 Closed
Loop Spatial Multiplexing.
For other configurations of the dlMimoMode parameter, Nokia recommends setting
the actcsiRsMultiplexing parameter to true.
Object path: MRBTS›NRBTS›NRCELL
7
Set the NRCELL CSI reporting periodicity (csiReportPeriodicity)
parameter to 160 or 320.
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Note:
You can configure those values with the NRCELL Downlink MIMO Mode
(dlMimoMode) parameter set to 8x4 Closed Loop Spatial Multiplexing.
If the dlMimoMode parameter is configured with a value different than 8x4
Closed Loop Spatial Multiplexing, then the csiReportPeriodicity
parameter can be configured with any value.
Object path:MRBTS›NRBTS›NRCELL
8
Set the NRCELL Number of CSI-RS resource period in one CSI report
period (csirsNumberWithinReportPeriod_Set1) parameter to 1 or 2.
Note:
With the dlMimoMode parameter set to 8x4 Closed Loop Spatial
Multiplexing and the csiReportPeriodicity parameter set to slots160,
the csirsNumberWithinReportPeriod_Set1 parameter needs to be set to 1.
If the csiReportPeriodicity parameter is set to slots320, then the
csirsNumberWithinReportPeriod_Set1 parameter can be set to 1 or 2.
Object path:MRBTS›NRBTS›NRCELL
9
Set the NRCELL CSI-RS Tracking Period (csirsTrackingPeriod) parameter to
80ms.
Object path:MRBTS›NRBTS›NRCELL›csirsForTracking
10 Set the NRCELL PUCCH mode selection (pucchModeSelect) parameter to
longPucch.
Object path: MRBTS›NRBTS›NRCELL
11 Set the NRCELLGRP SS Burst Set Period (ssBurstSetPeriod) parameter to 20.
Object path:MRBTS›NRBTS›NRCELLGRP
12 Configure the NRBTS Allow slow static NDM-SRS PRB pooling
(allowSlowPrbPoolingStatNdmSrs) parameter.
Nokia recommends configuring the allowSlowPrbPoolingStatNdmSrs parameter
when the NDM SRS is enabled on the capacity plug-in units or core unit with a higher number
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of cells.
From 25R1 release it is possible to set the allowSlowPrbPoolingStatNdmSrs
parameter to false when there are more than 6 cells with SRS-based beamforming enabled
per ABIP capacity plug-in unit. This allows to configure lower SRS periodicity which may
improve the performance of the CB008322: Sounding-based DL Short-Term Sub-band
Beamforming for NR FR1 TDD feature.
Note:
The exact number of cells depends on the configuration of the BTS Site Solution
features in your network. For more information, see the Operating
Documentation/Dimensioning/SRAN Dimensioning Guideline document.
Result
The network is configured for the activation of the CB008940 feature.
6.1.6 Activating CB008940
Instructions on how to activate the CB008940: Baseband Pooling of PRB - FR1 TDD feature in
the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that BTS has frequency range 1 (FR1) TDD cells configured.
Make sure that the network is configured for the activation of the CB008940. For more
information, see Pre-configurating CB008940.
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Note:
With PRB pooling enabled, the modulation and coding scheme (MCS) 0 is unable to provide
a sufficient transport block size to accommodate the payload of system information block
type 1 (SIB1). To accommodate the SIB1 payload, you need to set the
NRSYSINFO_PROFILE System Information target rate
(systemInformationTargetRate) parameter to 157 or to a higher value (at least
MCS1).
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate baseband resource pooling FR1 TDD
(actBbPoolTddFr1) parameter to true.
With the actBbPoolTddFr1 parameter set to true, Nokia recommends setting the
NRCELL Search space configuration Index
(type0SearchSpaceConfigurationIndex) parameter to 5.
Note:
When the NRCELL Search space configuration Index
(type0SearchSpaceConfigurationIndex) parameter cannot be set to 5 in
TDD cells with Coreset#0 configured to less than 48 PRBs (for example, cells with 10 or
15 MHz, as well as 20 MHz cells with PRB blanking enabled), Nokia recommends
setting the type0SearchSpaceConfigurationIndex parameter to 4.
Object path: MRBTS›NRBTS
3
Set the NRCELL Activate short BSR limit adaptation
(actShortBsrLimitAdaptation) parameter to true.
The actShortBsrLimitAdaptation parameter needs to be configured for all instances
of the NRCELL managed object.
Object path: MRBTS›NRBTS›NRCELL
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Result
With the CB008940 feature enabled, each FR1 TDD cell has a guaranteed minimum number of
available physical resource blocks (PRBs). Performance degradation can occur, but it can be
prevented by setting the NRBTS Activate enhanced algorithm of baseband
resource pooling FR1 TDD (actBbPoolTddFr1AlgEnh) parameter to true. For more
information see: 5G baseband pooling system impact section.
Note:
In scenarios where the actual traffic-based PRB demand is significantly lower than the cell's
maximum PRB capacity, enabling the NRBTS Activate over allocation
avoidance for cell stream PRB (actOverAllocAvoidForCellStrPrb)
parameter can improve overall TDD PRB pooling performance. For more details, see 5G
baseband pooling impact on physical resource blocks (PRBs) topic.
6.1.7 Deactivating CB008940
Instructions on how to deactivate the CB008940: Baseband Pooling of PRB - FR1 TDD feature
in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that BTS has frequency range 1 (FR1) TDD cells configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
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2
Set the NRBTS Activate baseband resource pooling FR1 TDD
(actBbPoolTddFr1) parameter to false.
Object path: MRBTS›NRBTS
3
Set the NRBTS Activate short BSR limit adaptation
(actShortBsrLimitAdaptation) parameter to false.
The actShortBsrLimitAdaptation parameter needs to be configured for all instances
of the NRCELL managed object.
Object path: MRBTS›NRBTS›NRCELL
Result
With the CB008940 feature disabled, each FR1 TDD cell doesn't have a guaranteed minimum
number of available physical resource blocks (PRBs).
6.1.8 Activating CB007112
Instructions on how to activate the CB007112: Baseband pooling of up to 16 DL MIMO layers
feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that BTS has frequency range 1 (FR1) TDD cells configured.
Make sure that the CB008940: Baseband Pooling of PRB - FR1 TDD feature is enabled.
For the best throughput performance in DL and UL with the CB007112 feature, Nokia
recommends:
Activating the CB008701: DL MU-MIMO Enhancements feature
Setting the NRCELL NR Cell type (nrCellType) parameter to 16DL4UL or
16DL8UL. At least two cell needs to be configured with the nrCellType parameter set
to 16DL4UL or 16DL8UL .
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Procedure
1
Set the NRBTS Activate large baseband resource pooling FR1 TDD
(actLargeBbPoolTddFr1) parameter to true.
Object path: MRBTS›NRBTS
Result
With the CB007112 feature enabled, 16 DL MIMO layers are pooled by the capacity plug-in unit.
6.1.9 Deactivating CB007112
Instructions on how to deactivate the CB007112: Baseband pooling of up to 16 DL MIMO
layers feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that BTS has frequency range 1 (FR1) TDD cells configured.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate large baseband resource pooling FR1 TDD
(actLargeBbPoolTddFr1) parameter to false.
Object path: MRBTS›NRBTS
Result
With the CB007112 feature disabled, 16 MIMO layers aren't pooled by the capacity plug-in unit.
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6.1.10 Activating CB010513
Instructions on how to activate the CB010513: Baseband Pooling—Extensions for FR1 TDD
feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that the BTS has frequency range 1 (FR1) TDD cells configured.
Make sure that the CB008940: Baseband Resource Pooling-FR1 TDD feature is enabled.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate baseband resource pooling FR1 TDD extension
(actBbPoolExtensionTddFr1) parameter to true.
Object path: ›MRBTS›NRBTS
3
Optional:
Configure the NRBTS Activate disabling of NR remote interference
management RS at gNB level (actDisableNrRimRsAtGnbLevel) parameter.
Object path: ›MRBTS›NRBTS
Result
With the CB010513 feature activated, you can enable baseband pooling together with Slice
Aware Scheduler, VoNR, DL Interference Generation, and Coordination of TDD Deployments
over Country Borders functionalities. Additionally, you can configure FR1 TDD cells with up to 1500
RRC-connected UEs for non-beamforming scenarios.
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Note:
With the CB010513 feature enabled, the degradation of the cell throughput can occur
depending on the configuration of the channel state information reference signal (CSI-RS)
periodicity. If the network is configured with periodicity of 160 and 320 slots, throughput
degradation can be prevented by setting the NRBTS Activate explicit TRS CSI
-RS pooling solution (actExplicitCsirsPoolSolution) to false. In case
the actExplicitCsirsPoolSolution parameter is set to true, the network can be
configured with periodicity of 40, 80, 160, and 320 slots. However, throughput degradation
can occur with periodicity of 160 and 320 slots .
Note:
In scenarios where the actual traffic-based PRB demand is significantly lower than the cell's
maximum PRB capacity, enabling the NRBTS Activate over allocation
avoidance for cell stream PRB (actOverAllocAvoidForCellStrPrb)
parameter can improve overall TDD PRB pooling performance. For more details, see 5G
baseband pooling impact on physical resource blocks (PRBs) topic.
6.1.11 Deactivating CB010513
Instructions on how to deactivate the CB010513: Baseband Pooling—Extensions for FR1 TDD
feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that the BTS has frequency range 1 (FR1) TDD cells configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
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Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate baseband resource pooling FR1 TDD extension
(actBbPoolExtensionTddFr1) parameter to false.
Object path: ›MRBTS›NRBTS
Result
With the CB010513 feature deactivated, you can't enable baseband pooling functionality
together with the Slice Aware Scheduler, VoNR, DL Interference Generation, and Coordination
of TDD Deployments over Country Borders functionalities. Additionally, you are unable to
configure FR1 TDD cells with up to 1500 RRC-connected UEs for non-beamforming scenarios.
6.1.12 Activating CB011028
Instructions on how to activate the CB011028: Baseband Pooling - Enhancements for FR1
TDD feature in the network.
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that the BTS has frequency range 1 (FR1) TDD cells configured.
Make sure that the CB010513: Baseband Pooling—Extensions for FR1 TDD feature is
activated.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
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2
Set the NRBTS Activate baseband resource pooling FR1 TDD extension
(actBbPoolTddFr1Enh) parameter to true.
Object path: MRBTS›NRBTS
Result
The dynamic resource allocation for the remote interference management reference signals (RIM
-RS) is enabled.
Note:
In scenarios where the actual traffic-based PRB demand is significantly lower than the cell's
maximum PRB capacity, enabling the NRBTS Activate over allocation
avoidance for cell stream PRB (actOverAllocAvoidForCellStrPrb)
parameter can improve overall TDD PRB pooling performance. For more details, see 5G
baseband pooling impact on physical resource blocks (PRBs) topic.
6.1.13 Deactivating CB011028
Instructions on how to deactivate the CB011028: Baseband Pooling - Enhancements for FR1
TDD feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that the BTS has frequency range 1 (FR1) TDD cells configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
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2
Set the NRBTS Activate baseband resource pooling FR1 TDD extension
(actBbPoolTddFr1Enh) parameter to false.
Object path: MRBTS›NRBTS
Result
The dynamic resource allocation for the remote interference management reference signals (RIM
-RS) is disabled.
6.2 Activating and deactivating FDD 5G baseband pooling
features
Activation and deactivation procedures related to FDD 5G baseband pooling features.
6.2.1 Activating 5GC002426 and CB007114
Instructions on how to activate the 5GC002426: Baseband Pooling of RRC Connected Users FDD and CB007114: Baseband pooling of Scheduled UEs per Slot - FDD features in the
network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a gNB restart. Activating the configuration plan triggers this action on the gNB side.
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Table 27: Prerequisite parameter settings for configuring the 5GC002426 and CB007114
features
Path
Parameter
Setting
NRBTS
Activate frequency domain scheduling
(actFdmScheduling)
true
NRBTS/NRCELL
PUCCH mode selection (pucchModeSelect)
longPucch
NRBTS/NRCELL
Maximum number of PDSCH allocation per
slot (maxNumPdschAllocationPerSlot)
12
NRBTS/NRCELL
Maximum number of PUSCH allocation per
slot (maxNumPuschAllocationPerSlot)
10
NRBTS/NRCELL
Activate increased frequency domain
multiplexed users per slot
(actIncreasedFdmUsersPerSlot)
true
Procedure
1
Go to Parameter Editor.
2
Set the NRBTSActivate scheduled UE per TTI pooling (actScheUePooling)
parameter to true.
MRBTS›NRBTS
3
Set the NRBTSActivate baseband pooling of RRC connected users
(actConnRrcPooling) parameter to true.
MRBTS›NRBTS
Result
With the 5GC002426 and CB007114 features activated, you can use a higher number of FDD
cells per capacity plug-in unit.
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6.2.2 Deactivating 5GC002426 and CB007114
Instructions on how to deactivate the 5GC002426: Baseband Pooling of RRC Connected Users
- FDD and CB007114: Baseband pooling of Scheduled UEs per Slot - FDD features in the
network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Check if the BTS is commissioned and operational.
Check if all BTS elements are detected and configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS restart. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTSActivate scheduled UE per TTI pooling (actScheUePooling)
parameter to false.
MRBTS›NRBTS
3
Set the NRBTSActivate baseband pooling of RRC connected users
(actConnRrcPooling) parameter to false.
MRBTS›NRBTS
Result
The baseband pooling of RRC-connected users and scheduled UEs is deactivated.
6.2.3 Activating 5GC001227 and CB009158
Instructions on how to activate the 5GC001227: Baseband Pooling of PRBs - FR1 FDDand
CB009158: PRB Pooling for FDD Cells - Enhancements features in the network
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Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure the BTS is commissioned and operational.
Make sure all BTS elements are detected and configured.
Make sure that the BBMODFDD NR cell configuration tradeoff
(fddNrCellConfigTradeoff) parameter is set to max cells extended.
Make sure that the following features are activated before activating the 5GC001227 and
CB009158 features:
5GC002426: Baseband Pooling of RRC Connected Users - FDD
CB007114: Baseband Pooling of Scheduled UEs per Slot - FDD
Make sure that the 5GC001242: UL and DL PRB Blanking for 10 MHz DSS Carrier is
deactivated.
Note:
The 5GC001227 and CB009158 features are activated together by using the
NRBTSActivate slow PRB pooling (actSlowPrbPooling) parameter.
Note:
During the cell addition, a capacity plug-in unit reset can occur due to the optimization of
internal resource usage. Nokia recommends adding the cells during non-busy hours, when
the amount of UEs in a cell is low.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTSActivate slow PRB pooling (actSlowPrbPooling) parameter to
true.
Object path: MRBTS›NRBTS
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Result
Physical resource blocks are shared between the cells.
6.2.4 Deactivating 5GC001227 and CB009158
Instructions on how to deactivate the 5GC001227: Baseband Pooling of PRBs - FR1 FDD and
CB009158: PRB Pooling for FDD Cells - Enhancements features in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure the BTS is commissioned and operational.
Make sure all BTS elements are detected and configured.
Note:
The 5GC001227 and CB009158 features are deactivated together by using the
NRBTSActivate slow PRB pooling (actSlowPrbPooling) parameter.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTSActivate slow PRB pooling (actSlowPrbPooling) parameter to
false.
Object path: MRBTS›NRBTS
Result
Physical resource blocks aren't shared between the cells.
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6.2.5 Activating CB009215
Instructions on how to activate the CB009215: PRB Pooling for FDD Cells – Concept
Refinement feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Make sure that the NRDU Flexible 5G FR1 carrier aggregation mode
(flexibleCAMode) parameter is set to NumberCellAmount .
Make sure that the following features are enabled before activating the CB009215 feature:
5GC002426: Baseband Pooling of RRC Connected Users - FDD and CB007114:
Baseband Pooling of Scheduled UEs per Slot - FDD
5GC001227: Baseband Pooling of PRBs - FR1 FDD and CB009158: PRB Pooling for
FDD Cells - Enhancements
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate slow PRB pooling enhancements in FDD FR1
(actSlowPrbPoolingFddFr1Enh) parameter to true.
Object path: ›MRBTS›NRBTS
3
Set the NRCELL Activate short BSR limit adaptation
(actShortBsrLimitAdaptation) parameter to true in all the instances of the
NRCELL managed object.
Object path: MRBTS›NRBTS›NRCELL
4
Set the NRBTS Activate a fix for non-3GPP compliant random access
response window in specific vendor UEs for FDD DSS cells
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(actFixNonCompRarWinFddDss) parameter to True.
Object path: MRBTS›NRBTS
Result
With the CB009215 feature enabled, resource pooling and cell throughput are improved by
optimizing the utilization of layer 1 (L1) processing resources for physical resource block (PRB)
handling in DL and UL.
6.2.6 Deactivating CB009215
Instructions on how to deactivate the CB009215: PRB Pooling for FDD Cells – Concept
Refinement feature in the network
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Modifying the settings of the parameters used in this procedure interrupts service availability
through a BTS reset. Activating the configuration plan triggers this action on the BTS side.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate slow PRB pooling enhancements in FDD FR1
(actSlowPrbPoolingFddFr1Enh) parameter to false.
Object path: MRBTS›NRBTS
Result
With the CB009215 feature disabled, resource pooling and cell throughput aren't improved due
to a lack of optimized utilization of layer 1 (L1) processing resources for physical resource block
(PRB) handling in DL and UL.
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6.2.7 Configuring automatic PRACH configuration index
Instructions on how to enable automatic allocation of the physical random access channel
(PRACH) configuration index for the frequency range 1 (FR1) FDD cells
Before you start
See Configuring Features with Web Element Manager for general management tool
instructions.
Make sure that the BTS is commissioned and operational.
Make sure that BTS elements are detected and configured.
Modifying the settings of the parameter used in this procedure interrupts service availability
through a BTS restart. Activating the configuration plan triggers this action on the BTS side.
Note:
The automatic PRACH configuration index functionality isn't supported together with the
CB006912: NR ABIN BB cell sets 12 cells NR FDD CPRI and OBSAI feature.
Procedure
1
Go to Parameter Editor.
2
Set the NRBTS Activate automated PRACH configuration index
assignment in FDD FR1 (actAutoPrachConfigIndexFdd) parameter to true.
Object path: MRBTS›NRBTS
Result
The automatic PRACH configuration index allocation is enabled, and the NRCELLPRACH
configuration index system value (prachConfigurationIndexSys) parameter
is assigned with automatically calculated value.
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5G baseband pooling glossary
A list of terms related to the 5G baseband pooling functionality
baseband (BB)
frequency band occupied by one signal or a number of multiplexed
signals at specified input and output points of a transmission system
baseband pool (BB
pool)
concentration of baseband resources in a single location, which enables
sharing of signal processing resources between cells. This helps maximize
the efficiency of baseband processing capacity usage
Candidate Set 1 (CS1)
in layer 2 scheduling, a selection of UEs eligible for being scheduled
among all connected UEs. The ordering of CS1 list is based on resource
priority classes and will serve as an input for time domain scheduling. One
CS1 list is created for UL and one for DL
Candidate Set 2 (CS2)
in layer 2 scheduling, selection of UEs that will be assigned to carriers. The
CS2 list is created after prioritization of UEs in CS1 list, based on time
domain (TD) metrics. The UEs with the highest TD metrics are selected for
frequency domain (FD) scheduling
dynamic spectrum
sharing (DSS)
technology that allows the operators to operate LTE and 5G NR in the
same band at the same time. There are two modes of dynamic spectrum
sharing: through a non-standalone mode (NSA) and a standalone mode
(SA)
Enhanced Common
Public Radio Interface
(eCPRI)
standard that defines the connection between eCPRI Radio Equipment
Control (eREC) and eCPRI Radio Equipment (eRE) through the fronthaul
transport network. It is used in 5G systems, LTE-Advanced, and LTE
-Advanced Pro
frequency range 1
(FR1)
frequency range below 7.125 GHz defined for 5G in 3GPP. The frequency
bands in FR1 are set for FDD, TDD, supplementary uplink (SUL), and
supplementary downlink (SDL)
frequency range 2
(FR2)
frequency range above 24.250 GHz defined for 5G in 3GPP. The frequency
bands in FR2 are set for TDD
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5G Baseband Pooling
gNB distributed unit
(gNB-DU)
logical node hosting Radio Link Control (RLC), Media Access Control (MAC),
and physical layers (PHY) of the gNB. Its operation is partly controlled by
the gNB central unit (gNB-CU). One gNB-DU supports one or multiple
cells. One cell is supported by only one gNB-DU
layer 2 (L2)
second layer in the 5G protocol stack, also called Media Access Control
layer (MAC) layer, which provides the radio resource allocation service and
the data transfer service to the upper layer
layer 2 real-time (L2
-RT)
logical function implemented in the gNB-DU. The L2-RT consists of Radio
Link Control, Media Access Control, and is a part of the radio access point,
which is located in the layer 2 of the capacity plug-in unit or core unit
MIMO
wireless communication method in which multiple radio transmitters and
receivers are used to improve the performance
multi-user MIMO (MU
-MIMO)
multiple input multiple output (MIMO) in which one base transceiver
station that has multiple transmitters serves several sets of user
equipment simultaneously by sharing the same radio resource
non-standalone (NSA)
type of 5G network configuration which uses dual connectivity with an
existing LTE radio, LTE core network, and 5G radio
physical resource block
(PRB)
set of allocated physical transport carriers and the time intervals those
carriers can use to transport data. It consists of 12 subcarriers in the
frequency domain and takes 14 orthogonal frequency division
multiplexing (OFDM) symbols in the time domain. The transmission time
interval is one millisecond
Packet Data
Convergence Protocol
(PDCP)
protocol for the compression of redundant Network Protocol Data Unit
(N-PDU) control information and the transfer of Packet Data Protocol
(PDP) user data using services provided by Radio Link Control (RLC)
protocol data unit
(PDU)
block of information transferred between peer entities. It contains
information such as how to transfer the message from the sender's
terminal to the recipient's terminal
RLC SDU segment
byte segment of a radio link control service data unit (RLC SDU)
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103
5G Baseband Pooling
standalone (SA)
in 5G, a network configuration independent from LTE, which uses 5G core
network and 5G radio network
supercell
a logical cell comprising multiple physical subcells sharing the same radio
resources
UE context
data structure in the BTS to store all the information related to a specific
UE in the active state. The UE context includes, for example, the UE state
information, security information, UE capability information, and the
identities of the UE-associated logical S1-connections
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