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CB008379: GBR Services for SA
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Single RAN Features
Rel. 25R1-SR
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CB008379: GBR Services for SA
Table of Contents
Summary of changes .................................................................................................................... 6
1 CB008379 overview and benefits ............................................................................................. 8
2 CB008379 requirements ............................................................................................................ 9
3 CB008379 system impact ........................................................................................................ 10
CB008379 interaction with other features ................................................................... 10
4 CB008379 description .............................................................................................................. 12
5 CB008379 reference data ........................................................................................................ 17
6 Activating and configuring CB008379 .................................................................................... 23
7 Deactivating CB008379 ............................................................................................................ 27
CB008379 glossary .................................................................................................................... 29
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CB008379: GBR Services for SA
List of Figures
Figure 1
4
Examples of services supported by the CB008379 feature ............................... 13
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CB008379: GBR Services for SA
List of Tables
Table 1
Table 2
Table 3
Issue 05.
Counters related to the CB008379 feature ............................................................ 18
Parameters related to the CB008379 feature ....................................................... 20
Prerequisite parameter settings for configuring the CB008379 feature .......... 23
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CB008379: GBR Services for SA
Summary of changes
A list of changes between document issues. You can navigate to the respective changed topics.
Changes between issues 04 (2023-02-28) and 05 (2023-12-11)
CB008379 description
A note regarding the lack of support of Evolved Packet System (EPS) fallback has been added.
Changes between issues 03 (2023-02-14) and 04 (2023-02-28)
Activating and configuring CB008379
Setting has been changed for the following parameters: NRBTSActivate PDCP/RLC
buffer congestion mechanism (actPdcpRlcBufCongestionMechsm),
NRBTSActivate prioritization of 5QI-1 and 5QI-5 traffic
(actPrioVoiceTraffic), and NRBTSActivate prioritization of non-VoNR
GBR traffic (actPrioNonVoNRGBRTraffic).
Changes between issues 02 (2022-09-30) and 03 (2023-02-14)
CB008379 description
A note regarding mechanism that discards the non-GBR DRBs has been added.
A note regarding support of 5QI-1 value has been added.
Activating and configuring CB008379
The following parameters has been added to the procedure: NRCELLActivate voice
over NR call support in the NR cell (actVoNR), NRCELLActivate
enhanced voice over NR call support in the NR cell
(actEnhancedVoNR), and NRDRBDiscard timer (discardTimer). The NRCELLGBR
scheduling congestion detection for Radio Admission Control
(gbrCongDetectionRac) parameter has been updated.
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CB008379: GBR Services for SA
1. CB008379 overview and benefits
The CB008379: GBR Services for SA feature improves end-user experience and radio resource
management for 5G standalone option 2 FDD and TDD network deployment in frequency range 1.
The 5G QoS indicator (5QI) values 2, 3, 4, 71, 72, 76 are introduced, as well as operator-defined 5QI
values in the range of 128-254 can be supported as GBR service.
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2. CB008379 requirements
Information where to find hardware, software, and license requirements
Hardware and software preconditions
For 5G supported hardware and software, see Reference Documentation/Compatibility matrix
and Operating Documentation/5G Features/List of Features and Documents.
For SRAN supported hardware and software, see Operating Documentation/Single RAN
Features/List of Features and Documents.
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.
For ASiR System supported hardware and software, see Operating Documentation/AirScale
Indoor Radio System/ASiR System Features/List of Features in ASiR System.
Sales information
For 5G and SRAN licensing information, see Operating Documentation/Single RAN
System/Licenses.
For ASiR System 5G licensing information, see Operating Documentation/AirScale Indoor Radio
System 5G/ASiR System 5G Features/List of Features Supported in ASiR System 5G.
For ASiR System licensing information, see Operating Documentation/AirScale Indoor Radio
System/ASiR System Features/List of Features in ASiR System.
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3. CB008379 system impact
The feature impacts cell capacity.
With the CB008379: GBR Services for SA feature enabled, cell capacity is reduced compared to
a cell supporting non-GBR services. Cell capacity is reduced due to the amount of traffic with
specific requirements. The traffic with specific requirements refers to UE traffic configured with a
GBR data radio bearer (DRB), and those UEs have specific packet delay budget and packet error
rate requirements. In the scheduler, such traffic gets a higher priority compared to non-GBR
traffic. Unlike non-GBR transmissions that can wait until RF conditions improve, GBR data has to
be sent within a packet delay budget to meet the GBR latency and data rate requirements.
Because of this, GBR transmissions can be sent in unfavorable RF conditions causing the GBR DRB
to occupy more resources, which reduces the resources for non-GBR DRB.
CB008379 interaction with other features
A list of correlations between this and another features
The CB008379: GBR Services for SA feature impacts the following features:
Emergency calls
For one protocol data unit (PDU) session, an emergency QoS flow can’t coexist with a single
GBR QoS flow.
Discontinuous reception (DRX)
The active DRX functionality is deactivated when a non-VoNR GRB data radio bearer (DRB) is
set up. The non-GBR DRX profile is restored at the release of the last GBR DRB of the UE. The
VoNR DRX profile is restored if the UE is still configured with VoNR GBR DRB.
Dynamic spectrum sharing (DSS)
GBR services are supported on NR cells where DSS functionality is activated. The radio
admission control (RAC) function considers the reduced cell capacity when DSS is activated.
This is because DSS divides the resources between LTE and NR, so the RAC is based on the
reduced resources that were allocated to NR.
Carrier aggregation (CA)
GBR services are supported on NR cells where CA is activated. When CA is active and GBR
bearer is set up, the gNB schedules GBR DRB on the primary cell only and keeps CA activated.
Slice-aware scheduler
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The different level of GBR traffic per slice negatively affects the resource distribution for the
slices with low GBR traffic. Nokia recommends to not activate GBR services together with slice
aware scheduler.
Multiple bandwidth parts (BWPs)
GBR load per BWP can be periodically reported from layer 2 Tunneling Protocol to the control
plane for GBR RAC.
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4. CB008379 description
The CB008379: GBR Services for SA feature introduces support for 5G QoS indicator (5QI)
values for GBR services such as conversational video and live streaming, and operator-defined
5QI values. The CB008379 feature provides parameters configuring the GBR flow control, non
-VoNR GBR data radio bearer (DRB), scheduling, and radio admission control (RAC).
GBR services are QoS services with GBR bearers. Some examples of GBR services are conversation
video transmissions such as live streams or real-time gaming streams. With the CB008379: GBR
Services for SA feature enabled, such services are supported in 5G standalone network
deployment with 5G QoS indicator (5QI) values 2, 3, 4, 71, 72, 76, and 5QI values defined by the
operator in the range of 128-254. The services supported by the CB008379 feature are based on
the
3GPP TS 23.501 Release 16 version 16.9.0.
Note:
Starting from the 23R1 release, the CB008379: GBR Services for SA feature supports the
5QI-1 value.
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CB008379: GBR Services for SA
Figure 1: Examples of services supported by the CB008379 feature
The CB008379 feature is enabled with the NRCELLActivate GBR services support
in the NR cell (actNonVoNRGbrService) parameter. With the CB008379 feature
enabled, the GBR DRB setup is requested only when a non-GBR DRB is set as a default bearer for
the same protocol data unit (PDU) session.
The CB008379 feature supports configuring the UE with up to two GBR DRBs at the same time,
in case one is a VoNR GBR DRB introduced by the CB006112: Voice over NR Enhancement
feature, and another is a non-VoNR GBR DRB. Supporting two GBR DRBs allows the UE to have
both GBR services, such as voice which has value of 5QI-1 and, for example, video which has value
of 5QI-2.
A single GBR QoS flow is supported for the UE. In a no data load scenario and low interference
conditions, the guaranteed bit rate for a single GBR QoS flow is up to 30 Mbps for both downlink
and uplink. The CB008379 feature supports guaranteed flow bit rate (GFBR) modification. The
GFBR is modified by NR core network and defines the expected bit rate that a GBR QoS flow
provides.
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Note:
Nokia is 3GPP-compliant and hence doesn't support Evolved Packet System (EPS) fallback
due to a QoS flow modification failure. For more information, see:
TS 23.501, section 15.16.3.10 IMS Voice Service via EPS Fallback or RAT fallback in 5GS
TS 23.502, section 4.13.6.1 EPS fallback for IMS voice4
GBR flow control
The CB008379 feature supports DL flow control for GBR DRB. For the non-VoNR GBR DRB, the
DL flow control needs to be enabled using the NRDRBDL flow control algorithm
(dlFlowControlAlgo) parameter.
The GBR flow control can be defined with the NRDRBMax RLC queuing delay GBR
(maxRlcQueueingDelayGbr), NRDRBMax transfer delay GBR
(maxTransferDelayGbr), and NRBTSActivate prioritization of non-VoNR GBR
traffic (actPrioNonVoNRGBRTraffic) parameters introduced by the CB008379 feature.
When buffer congestion is detected at Packet Data Convergence Protocol (PDCP) or RLC, the non
-GBR packets are discarded before the GBR DRB. The NRBTSActivate PDCP/RLC buffer
congestion mechanism (actPdcpRlcBufCongestionMechsm) parameter allows you to
choose whether the gNB discards a non-GBR packet when buffer congestion is detected for a GBR
bearer only, or when buffer congestion is detected for both GBR or non-GBR bearers.
The NRBTSPDCP buffer usage threshold (pdcpBufUsageThreshold) and
NRBTSRLC buffer usage threshold (rlcBufUsageThreshold) parameters allow you
to set the threshold for the percentage of allowed PDCP and RLC buffer usage. When these
thresholds are exceeded, the PDCP service data units (SDUs) and RLC SDUs are discarded for non
-GBR DRBs. You can configure the number of PDCP SDUs and RLC SDUs for non-GBR DRBs that
needs to be discarded with the NRBTSNumber of non GBR RLC SDU to be discarded
(numNonGbrRlcSduDiscard) and NRBTSNumber of non GBR PDCP SDU to be
discarded (numNonGbrPdcpSduDiscard) parameters.
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Note:
The functionality of the actPdcpRlcBufCongestionMechsm parameter discards the
data of the non-GBR bearer with the highest amount of data in the buffer. Due to this
process, there is space for the incoming data, but the functionality can't ensure the
required amount of buffering in all cases. This impacts the User Datagram Protocol (UDP)
data when the inflow data rate is higher than the outflow data rate in the air interface.
GBR DRB configuration
DRBs are mapped with each GBR QoS flow identifier (QFI) through RRC signaling. A separate
profiles should be used for VoNR and non-VoNR GBR DRBs. The DRBs profiles need to be
configured with parameters introduced by the CB008379 feature, and with existing parameters.
There are two Radio Link Control (RLC) modes for the GBR DRBs - RLC-acknowledged mode and
RLC-unacknowledged mode. Both modes apply to the GBR DRBs associated with 5QI-4, 71, 72, 76
and 5QI defined by the operator. The 5QI-2 and 5QI-3 can only use RLC unacknowledged mode.
GBR DRBs scheduling
The GBR DRBs are scheduled dynamically with a higher scheduling priority than non-GBR DRBs.
The GBR DRBs scheduling sub-priority is based on the packet delay budget (PDB) which
differentiates the types of GBR services. The uplink and downlink schedulers consider the PDB and
GFBR during scheduling decisions.
Radio Admission Control (RAC) and mobility
During the handover procedure, the gNB performs RAC for GBR DRBs. The Transport Admission
Control together with allocation and retention priority (ARP)-based admission control aren't
performed. The RAC function checks the current radio resource usage and resource availability
during the request for a GFBR increase. Dedicated RAC thresholds can be defined for the UE
connected with the GBR DRB for both mobility and non-mobility scenarios. For more information,
see Radio admission control for 5G SA description in Radio Admission Control for 5G SA
document.
The following mobility scenarios are supported by the CB008379 feature:
intra-NR mobility, such as intra-frequency and inter-frequency handover
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An intra-frequency handover reuses the handover trigger and procedure from the
5GC000704: Intra-Frequency Handover via Xn (SA Option 2) feature, and an inter-frequency
handover from the 5GC000706: Inter-Frequency Handover via Xn (SA Option 2) feature.
inter-RAT mobility, such as inter-RAT handover from NR to LTE
An inter-RAT handover from NR to LTE reuses the handover trigger and procedure from the
5GC000707: Inter-RAT Handover to LTE (SA Option 2) feature.
PMQAP profiles
PMQAP is a operator-configurable profile for 5G performance measurement (PM) counters. The
5QI-related PM counters are collected and measured based on PMQAP profile. You can define
what granularity is included in PM counters values:
QCI
5QI
ARP
slice identity
public land mobile network identifier identity
The PMQAP profiles can be created based on 5QI values introduced by the CB008379 feature to
get the needed counters within specific 5QI groups separately. For more information on PMQAP
profile and its configuration, see the CB006898: PMQAP Profiles for NR - I feature.
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5. CB008379 reference data
A list of management data related to the feature: measurements, counters, and parameters
For reference data descriptions, see Reference Documentation/Reference document.
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Measurements and counters
Table 1: Counters related to the CB008379 feature
Counter ID
Counter name
Measurement
M55139C04501
The number admission
control success due to full
bandwidth for GBR
Standalone (SA) Distributed unit
(DU) Radio admission control
measurement
M55139C04502
The number admission
control success due to
partial bandwidth for GBR
Standalone (SA) Distributed unit
(DU) Radio admission control
measurement
M55139C04503
The number admission
control attempts due to
full bandwidth for GBR
Standalone (SA) Distributed unit
(DU) Radio admission control
measurement
M55139C04504
The number admission
control attempts due to
partial bandwidth for GBR
Standalone (SA) Distributed unit
(DU) Radio admission control
measurement
M55320C03001
DL PDCP SDU volume
discarded due to other
causes - QoS Group 01
NR PDCP Report 2
M55320C04001
DL PDCP SDUs discarded due
to other causes - QoS Group
01
NR PDCP Report 2
M55320C05001
DL PDCP SDU volume
discarded due to exceeding
buffer threshold - QoS
Group 01
NR PDCP Report 2
M55320C06001
DL PDCP SDUs discarded due
to exceeding buffer
threshold - QoS Group 01
NR PDCP Report 2
M55320C20010
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 10
NR PDCP Report 2
M55320C20011
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 11
NR PDCP Report 2
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Counter ID
Counter name
Measurement
M55320C20012
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 12
NR PDCP Report 2
M55320C20013
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 13
NR PDCP Report 2
M55320C20014
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 14
NR PDCP Report 2
M55320C20015
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 15
NR PDCP Report 2
M55320C20016
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 16
NR PDCP Report 2
M55320C20017
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 17
NR PDCP Report 2
M55320C20018
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 18
NR PDCP Report 2
M55320C20019
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 19
NR PDCP Report 2
M55320C20020
DL PDCP SDUs discarded due
to PDCP discard timer
expiry - QoS Group 20
NR PDCP Report 2
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CB008379: GBR Services for SA
Parameters
Table 2: Parameters related to the CB008379 feature
Full name
Abbreviated name
Path
Activate PDCP/RLC
buffer congestion
mechanism
actPdcpRlcBufCongestionM
echsm
MRBTS/NRBTS
Activate
prioritization of
5QI-1 and 5QI-5
traffic
actPrioVoiceTraffic
MRBTS/NRBTS
Activate
prioritization of
non-VoNR GBR traffic
actPrioNonVoNRGBRTraffic
MRBTS/NRBTS
Number of non GBR
PDCP SDU to be
discarded
numNonGbrPdcpSduDiscard
MRBTS/NRBTS
Number of non GBR RLC
SDU to be discarded
numNonGbrRlcSduDiscard
MRBTS/NRBTS
PDCP buffer usage
threshold
pdcpBufUsageThreshold
MRBTS/NRBTS
RLC buffer usage
threshold
rlcBufUsageThreshold
MRBTS/NRBTS
Activation of radio
admission control for
GBR data radio
bearers
actGBRAdmissionControl
MRBTS/NRBTS/NRCELL
Activate GBR load
reporting for DSS
actGbrLoadRepDss
MRBTS/NRBTS/NRCELL
Activate GBR services
support in the NR
cell
actNonVoNRGbrService
MRBTS/NRBTS/NRCELL
Additional GBR
traffic resources for
handovers
addGbrTrafficHo
MRBTS/NRBTS/NRCELL
Additional number of
GBR DRB resources for
handovers
addNumOfGBRBearers
MRBTS/NRBTS/NRCELL
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Full name
Abbreviated name
Path
GBR scheduling
congestion detection
for Radio Admission
Control
gbrCongDetectionRac
MRBTS/NRBTS/NRCELL
Discard timer
discardTimer
MRBTS/NRBTS/NRDRB
DL flow control
algorithm
dlFlowControlAlgo
MRBTS/NRBTS/NRDRB
DSCP
dscp
MRBTS/NRBTS/NRDRB
L2 overhead factor
GBR DL
l2OHFactorDl
MRBTS/NRBTS/NRDRB
L2 overhead factor
GBR UL
l2OHFactorUl
MRBTS/NRBTS/NRDRB
Maximum GBR DL
maxDataRateGbrDl
MRBTS/NRBTS/NRDRB
Maximum GBR UL
maxDataRateGbrUl
MRBTS/NRBTS/NRDRB
Max RLC queuing delay
GBR
maxRlcQueueingDelayGbr
MRBTS/NRBTS/NRDRB
Max transfer delay
GBR
maxTransferDelayGbr
MRBTS/NRBTS/NRDRB
New Radio DRB RLC
mode
rlcMode
MRBTS/NRBTS/NRDRB
List of 5QI values
fiveqiValueList
MRBTS/NRBTS/NRDRB_5QI
Delay target
delayTarget
MRBTS/NRBTS/NRDRB_MAC
Logical channel group
identifier
lcgid
MRBTS/NRBTS/NRDRB_MAC
Scheduling bucket
size duration
schedulBSD
MRBTS/NRBTS/NRDRB_MAC
Scheduling priority
schedulPrio
MRBTS/NRBTS/NRDRB_MAC
New Radio DRB RLC AM
Profile instance
identifier
nrDrbRlcAmId
MRBTS/NRBTS/NRDRB_RLC_AM
New Radio DRB RLC UM
Profile instance
identifier
nrDrbRlcUmId
MRBTS/NRBTS/NRDRB_RLC_UM
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CB008379: GBR Services for SA
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Full name
Abbreviated name
Path
5QI configuration
range
cfg5qiRange
MRBTS/NRBTS/NRPMRNL/NRPMQA
P
There are no alarms, faults, and key performance indicators related to the CB008379: GBR
Services for SA feature.
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CB008379: GBR Services for SA
6. Activating and configuring CB008379
Instructions to activate GBR services for the NR cell in standalone option 2 network deployment
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 doesn't interrupt service
availability.
The following parameters need to be configured before activating the CB008379: GBR Services
for SA feature:
Table 3: Prerequisite parameter settings for configuring the CB008379 feature
Path
Parameter
Setting
MRBTS/MNL
Product variant planned
(productVariantPlanned)
sBTS
MRBTS/NRBTS/NRCELL
Activation of radio
admission control for
GBR data radio bearers
(actGBRAdmissionControl)
GBRService
MRBTS/NRBTS/NRCELL
Cell deployment type
(cellDepType)
SA
MRBTS/NRBTS/NRDRB
New Radio resource type
(resType)
GBR
MRBTS/NRBTS/NRDRB
DL flow control
algorithm
(dlFlowControlAlgo)
3gppFlowControl
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Procedure
1
Go to Parameter Editor.
2
Set the NRCELLActivate GBR services support in the NR cell
(actNonVoNRGbrService) parameter to true.
Object path: MRBTS›NRBTS›NRCELL
3
Configure the NRDRB_5QIList of 5QI values (fiveqiValueList) parameter.
Object path: MRBTS›NRBTS›NRDRB_5QI
4
Set the NRBTSActivate PDCP/RLC buffer congestion mechanism
(actPdcpRlcBufCongestionMechsm) parameter to gbrNonGbr.
Object path: MRBTS›NRBTS
5
Configure the NRBTSPDCP buffer usage threshold (pdcpBufUsageThreshold)
parameter.
Object path: MRBTS›NRBTS
6
Configure the NRBTSNumber of non GBR PDCP SDU to be discarded
(numNonGbrPdcpSduDiscard) parameter.
Object path: MRBTS›NRBTS
7
Configure the NRBTSNumber of non GBR RLC SDU to be discarded
(numNonGbrRlcSduDiscard) parameter.
Object path: MRBTS›NRBTS
8
Configure the NRBTSRLC buffer usage threshold (rlcBufUsageThreshold)
parameter.
Object path: MRBTS›NRBTS
9
Set the NRBTSActivate prioritization of non-VoNR GBR traffic
(actPrioNonVoNRGBRTraffic) parameter to false.
Object path: MRBTS›NRBTS
10 Set the NRBTSActivate prioritization of 5QI-1 and 5QI-5 traffic
(actPrioVoiceTraffic) parameter to false.
24
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CB008379: GBR Services for SA
MRBTS›NRBTS
11 Set the NRCELLActivate voice over NR call support in the NR cell
(actVoNR) parameter to true.
Object path: MRBTS›NRBTS›NRCELL
12 Set the NRCELLActivate enhanced voice over NR call support in the
NR cell (actEnhancedVoNR) parameter to true.
Object path: MRBTS›NRBTS›NRCELL
13 Optional:
Configure the NRCELLGBR scheduling congestion detection for Radio
Admission Control (gbrCongDetectionRac) parameter.
Object path: MRBTS›NRBTS›NRCELL
If the gbrCongDetectionRac parameter is set to true, then the GBR time domain
scheduling congestion at L2 drives GBR load to 100%. If GBR load is set to 100%, then no
further GBR DRBs are admitted until congestion is no longer present.
14 Configure the NRDRBDiscard timer (discardTimer) parameter.
Object path: MRBTS›NRBTS›NRDRB
15 Configure the NRDRBMaximum GBR UL (maxDataRateGbrUl) parameter.
Object path: MRBTS›NRBTS›NRDRB
16 Configure the NRDRBMaximum GBR DL (maxDataRateGbrDl) parameter.
Object path: MRBTS›NRBTS›NRDRB
17 Configure the NRDRBMax RLC queuing delay GBR (maxRlcQueueingDelayGbr)
parameter.
Object path: MRBTS›NRBTS›NRDRB
18 Configure the NRDRBMax transfer delay GBR (maxTransferDelayGbr)
parameter.
Object path: MRBTS›NRBTS›NRDRB
19 Configure the NRDRBL2 overhead factor GBR DL (l2OHFactorDl) parameter.
Object path: MRBTS›NRBTS›NRDRB
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20 Configure the NRDRBL2 overhead factor GBR UL (l2OHFactorUl) parameter.
Object path: MRBTS›NRBTS›NRDRB
21 Map the NRDRB_MAC object path to the NRDRBNew Radio DRB MAC Profile
distinguished name (nrDrbMacDN) parameter value.
Step example
In case the NRDRB_MAC object path is MRBTS-773/NRBTS-0/NRDRB_MAC-1, the
nrDrbMacDN parameter value needs to be set to MRBTS-773/NRBTS-0/NRDRB_MAC-1.
22 Configure the NRDRB_MACScheduling bucket size duration (schedulBSD)
parameter.
Object path: MRBTS›NRBTS›NRDRB_MAC
23 Configure the NRDRB_MACDelay target (delayTarget) parameter.
Object path: MRBTS›NRBTS›NRDRB_MAC
24 Map the NRDRB_PDCP object path to the NRDRBNew Radio DRB PDCP Profile
distinguished name (nrDrbPdcpDN) parameter value.
25 Map the NRDRB_RLC_AM object path to the NRDRBNew Radio DRB RLC AM Profile
distinguished name (nrDrbRlcAmDN) parameter value.
In this procedure the RLC acknowledged mode configuration is provided for demonstration
purposes only. The RLC unacknowledged mode configuration is also supported and it
depends on the actual 5QI profiles.
Result
The NR cell in standalone option 2 network deployment supports GBR services and 5QI values
defined by the operator.
26
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CB008379: GBR Services for SA
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CB008379: GBR Services for SA
7. Deactivating CB008379
Instructions to deactivate GBR services for the NR cell in standalone option 2 network
deployment
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 doesn't interrupt service
availability.
Procedure
1
Go to Parameter Editor.
2
Set the NRCELLActivate GBR services support in the NR cell
(actNonVoNRGbrService) parameter to false.
Object path: MRBTS›NRBTS›NRCELL
3
Remove the 5QI values 2, 3, 4, 71, 72, 76, and the values in range of 128-254 from the
NRDRB_5QIList of 5QI values (fiveqiValueList) parameter.
Object path: MRBTS›NRBTS›NRDRB_5QI
4
Set the NRCELLActivation of radio admission control for GBR data
radio bearers (actGBRAdmissionControl) parameter to one of the following
values:
off
EnhancedVoNR
Object path: MRBTS›NRBTS›NRCELL
5
Remove the NRCELLGBR scheduling congestion detection for Radio
Admission Control (gbrCongDetectionRac) parameter.
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Object path: MRBTS›NRBTS›NRCELL
6
Set the NRBTSActivate prioritization of non-VoNR GBR traffic
(actPrioNonVoNRGBRTraffic) parameter to false.
Object path: MRBTS›NRBTS
Result
The NR cell in standalone option 2 network deployment no longer supports GBR services and 5QI
values defined by the operator.
28
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CB008379: GBR Services for SA
CB008379 glossary
A list of terms related to the CB008379: GBR Services for SA feature
5G QoS identifier (5QI)
In 5G a scalar that is used as a reference to a specific QoS forwarding
behavior such as packet loss rate or packet delay budget and it is
provided to a 5G QoS flow. This may be implemented in the access
network by the 5QI referencing node specific parameters that control
the QoS forwarding treatment like scheduling weights, admission
thresholds, queue management thresholds, link layer protocol
configuration.
QoS flow identifier (QFI)
A field associated with the transferred packet. QFI is used to
determine the QoS flow and QoS profile which are associated with
the received packet.
acknowledged mode (AM)
Radio Link Control mode in which a receiver provides feedback if the
packets are correctly received or not, and triggers retransmission if
needed.
access and mobility
management function
(AMF)
A function in 5G control plane that supports the termination of non
-access stratum (NAS) signaling, NAS ciphering and integrity
protection, registration management, connection management,
mobility management, access authentication and authorization,
security and context management.
admission control (AC)
A decision process that determines the resource allocation in a cell
whenever a request for resources is made during bearer setup,
bearer renegotiation, or handover.
allocation and retention
priority (ARP)
A QoS parameter that's used to differentiate between bearers when
performing allocation and retention of a bearer. The ARP can be used
by the network to decide whether a certain bearer can be established
or must be rejected in case of resource limitations. Also, it can be
used to decide which bearers are dropped in case of exceptional
resource limitations, for instance, during a handover. This QoS
parameter, however, doesn't affect the packet forwarding in the
network.
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CB008379: GBR Services for SA
data radio bearer (DRB)
A radio bearer that is established between the gNB and UE to
transport user plane data only.
guaranteed bit rate (GBR)
A QoS parameter defining the resource type of the bearer (dedicated
Evolved Packet System (EPS) bearer). GBR services always have the
guaranteed bandwidth.
GBR QoS flow
A mechanism used for the 5G QoS management. GBR QoS flow uses
the GBR resource type or the delay-critical GBR resource type, and
requires guaranteed flow bit rate.
GFBR (Guaranteed Flow Bit
Rate)
A QoS parameter used in 5G to define the expected bit rate that a
GBR (Guaranteed Bit Rate) QoS flow provides. The GFBR is signaled
through the next generation control plane interface (NG-C) from the
access and mobility management function (AMF), or in case of
handover, from the related Xn Application Protocol (XnAP) or Next
Generation Application Protocol (NGAP) messages.
non-guaranteed bit rate
(non-GBR)
A QoS parameter defining the resource type of the bearer (default
Evolved Packet System (EPS) bearer) in which the number of bits to
be delivered to a receiver isn't guaranteed.
The Packet Delay Budget
(PDB)
A definition of an packet upper bound related to the time for which a
packet can be delayed between the UE and the user plane function
(UPF).
protocol data unit (PDU)
A 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.
QoS Class Identifier (QCI)
A mechanism used in LTE to ensure bearer traffic is allocated
appropriate QoS. Different bearer traffic requires different QoS and
therefore different QCI values. QCI value 9 is typically used for the
default bearer of a UE/PDN for non-privileged subscribers. The QoS
concept as used in LTE networks is class-based, where each bearer
type is assigned one QCI by the network. QCI is a scalar that is used
within the BTS as a reference to node-specific parameters that
control packet forwarding treatment, for example, scheduling weight,
admission thresholds, and link-layer protocol configuration.
30
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CB008379: GBR Services for SA
Quality of Service (QoS)
Collective effect of service performance, which determines the
degree of service user satisfaction. QoS is characterized by the
combined aspects of performance factors applicable to all the
services, such as service operability performance, service accessibility
performance, service retainability performance, service integrity
performance, and other factors specific to each service.
service data unit (SDU)
A unit of data passed from the Open Systems Interconnection layer
or sublayer to a lower layer.
unacknowledged mode
(UM)
Radio Link Control in which upper layer segmentation is maintained
but retransmissions aren't used.
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