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Content for  TS 38.331  Word version:  18.2.0

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5.3.5.5 Cell Group configuration  5.3.5.5.1 General  5.3.5.5.2 Reconfiguration with sync  5.3.5.5.3 RLC bearer release  5.3.5.5.4 RLC bearer addition/modification  5.3.5.5.5 MAC entity configuration  5.3.5.5.6 RLF Timers & Constants configuration  5.3.5.5.7 SpCell Configuration  5.3.5.5.8 SCell Release  5.3.5.5.9 SCell Addition/Modification  5.3.5.5.10 BH RLC channel release  5.3.5.5.11 BH RLC channel addition/modification  5.3.5.5.12 Uu Relay RLC channel release  5.3.5.5.13 Uu Relay RLC channel addition/modification  5.3.5.5.14 NCR-Fwd configuration 
...

 

5.3.5.5  Cell Group configuration  p. 109

5.3.5.5.1  General  p. 109
The network configures the UE with Master Cell Group (MCG), and zero or one Secondary Cell Group (SCG). In (NG)EN-DC, the MCG is configured as specified in TS 36.331, and for NE-DC, the SCG is configured as specified in TS 36.331. The network provides the configuration parameters for a cell group in the CellGroupConfig IE.
The UE performs the following actions based on a received CellGroupConfig IE:
1 >
if the CellGroupConfig contains the spCellConfig with reconfigurationWithSync:
2 >
perform Reconfiguration with sync according to clause 5.3.5.5.2;
2 >
resume all suspended radio bearers except the SRBs for the source cell group, and resume SCG transmission for all radio bearers, and resume BH RLC channels and resume SCG transmission for BH RLC channels for IAB-MT, if suspended;
1 >
if the CellGroupConfig contains the rlc-BearerToReleaseList or rlc-BearerToReleaseListExt:
2 >
perform RLC bearer release as specified in clause 5.3.5.5.3;
1 >
if the CellGroupConfig contains the rlc-BearerToAddModList:
2 >
perform the RLC bearer addition/modification as specified in clause 5.3.5.5.4;
1 >
if the CellGroupConfig contains the mac-CellGroupConfig:
2 >
configure the MAC entity of this cell group as specified in clause 5.3.5.5.5;
1 >
if the CellGroupConfig contains the sCellToReleaseList:
2 >
perform SCell release as specified in clause 5.3.5.5.8;
1 >
if the CellGroupConfig contains the spCellConfig:
2 >
configure the SpCell as specified in clause 5.3.5.5.7;
1 >
if the CellGroupConfig contains the sCellToAddModList:
2 >
perform SCell addition/modification as specified in clause 5.3.5.5.9;
1 >
if the CellGroupConfig contains the bh-RLC-ChannelToReleaseList:
2 >
perform BH RLC channel release as specified in clause 5.3.5.5.10;
1 >
if the CellGroupConfig contains the bh-RLC-ChannelToAddModList:
2 >
perform the BH RLC channel addition/modification as specified in clause 5.3.5.5.11;
1 >
if the CellGroupConfig contains the uu-RelayRLC-ChannelToReleaseList:
2 >
perform Uu Relay RLC channel release as specified in clause 5.3.5.5.12;
1 >
if the CellGroupConfig contains the uu-RelayRLC-ChannelToAddModList:
2 >
perform the Uu Relay RLC channel addition/modification as specified in clause 5.3.5.5.13;
1 >
if the CellGroupConfig contains the ncr-FwdConfig:
2 >
perform the NCR-Fwd configuration as specified in 5.3.5.5.14;
1 >
if the CellGroupConfig contains the autonomousDenialParameters:
2 >
consider itself to be allowed to deny any transmission in a particular UL slot if during the number of slots indicated by autonomousDenialValidity, preceding and including this particular slot, it autonomously denied fewer UL slots than indicated by autonomousDenialSlots within the same cell group;
Up
5.3.5.5.2  Reconfiguration with sync  p. 110
The UE shall perform the following actions to execute a reconfiguration with sync.
1 >
if the AS security is not activated, perform the actions upon going to RRC_IDLE as specified in clause 5.3.11 with the release cause 'other' upon which the procedure ends;
1 >
stop timer T430 if running;
1 >
if no DAPS bearer is configured:
2 >
stop timer T310 for the corresponding SpCell, if running;
1 >
if this procedure is executed for the MCG:
2 >
if timer T316 is running;
3 >
if the UE supports RLF-Report for fast MCG recovery procedure:
4 >
set the elapsedTimeT316 in the VarRLF-Report to the value of the elapsed time of the timer T316;
4 >
set the pSCellId to the global cell identity of the PSCell, if available, otherwise to the physical cell identity and carrier frequency of the PSCell;
3 >
else:
4 >
clear the information included in VarRLF-Report, if any;
2 >
resume MCG transmission, if suspended.
1 >
stop timer T312 for the corresponding SpCell, if running;
1 >
if sl-PathSwitchConfig is included:
2 >
consider the target L2 U2N Relay UE to be the one indicated by the targetRelayUE-Identity in the sl-PathSwitchConfig;
2 >
start timer T420 for the corresponding target L2 U2N Relay UE with the timer value set to t420, as included in the sl-PathSwitchConfig;
2 >
apply the value of the newUE-Identity as the C-RNTI;
2 >
indicate to upper layer (to trigger the PC5 unicast link establishment) with the target L2 U2N Relay UE indicated by the targetRelayUE-Identity;
2 >
apply the default configuration of SL-RLC1 as defined in clause 9.2.4 for SRB1;
1 >
else (sl-PathSwitchConfig is not included):
2 >
if this procedure is executed for the MCG or if this procedure is executed for an SCG not indicated as deactivated in the E-UTRA or NR RRC message in which the RRCReconfiguration message is embedded:
3 >
start timer T304 for the corresponding SpCell with the timer value set to t304, as included in the reconfigurationWithSync;
2 >
if the frequencyInfoDL is included:
3 >
consider the target SpCell to be one on the SSB frequency indicated by the frequencyInfoDL with a physical cell identity indicated by the physCellId;
2 >
else:
3 >
consider the target SpCell to be one on the SSB frequency of the source SpCell with a physical cell identity indicated by the physCellId;
2 >
start synchronising to the DL of the target SpCell;
2 >
apply the specified BCCH configuration defined in clause 9.1.1.1 for the target SpCell;
2 >
acquire the MIB of the target SpCell, which is scheduled as specified in TS 38.213;
2 >
if NTN-Config is configured for the target cell:
3 >
start timer T430 with the timer value set to ntn-UlSyncValidityDuration from the subframe indicated by epochTime, according to the target cell NTN-Config;
2 >
If any DAPS bearer is configured:
3 >
create a MAC entity for the target cell group with the same configuration as the MAC entity for the source cell group;
3 >
for each DAPS bearer:
4 >
establish an RLC entity or entities for the target cell group, with the same configurations as for the source cell group;
4 >
establish the logical channel for the target cell group, with the same configurations as for the source cell group;
3 >
for each SRB:
4 >
establish an RLC entity for the target cell group, with the same configurations as for the source cell group;
4 >
establish the logical channel for the target cell group, with the same configurations as for the source cell group;
3 >
suspend SRBs for the source cell group;
3 >
apply the value of the newUE-Identity as the C-RNTI in the target cell group;
3 >
configure lower layers for the target SpCell in accordance with the received spCellConfigCommon;
3 >
configure lower layers for the target SpCell in accordance with any additional fields, not covered in the previous, if included in the received reconfigurationWithSync.
2 >
else:
3 >
reset the MAC entity of this cell group;
3 >
consider the SCell(s) of this cell group, if configured, that are not included in the SCellToAddModList in the RRCReconfiguration message, to be in deactivated state;
3 >
apply the value of the newUE-Identity as the C-RNTI for this cell group;
3 >
configure lower layers in accordance with the received spCellConfigCommon;
3 >
if rach-LessHO is included:
4 >
configure lower layers in accordance with rach-LessHO for the target SpCell;
3 >
configure lower layers in accordance with any additional fields, not covered in the previous, if included in the received reconfigurationWithSync.
2 >
if the UE is acting as L2 U2N Remote UE at the source side:
3 >
indicate upper layer to trigger PC5 unicast link release.
Upon L2 U2N Relay UE receiving reconfigurationWithSync, it either indicates to upper layers (to trigger PC5 unicast link release) or sends NotificationMessageSidelink message to the connected L2 U2N Remote UE(s) in accordance with clause 5.8.9.10.
Up
5.3.5.5.3  RLC bearer release  p. 113
The UE shall:
1 >
for each logicalChannelIdentity/LogicalChannelIdentityExt value included in the rlc-BearerToReleaseList/rlc-BearerToReleaseListExt that is part of the current UE configuration within the same cell group (LCH release); or
1 >
for each logicalChannelIdentity value that is to be released as the result of an SCG release according to clause 5.3.5.4:
2 >
release the RLC entity or entities as specified in clause 5.1.3 of TS 38.322;
2 >
release the corresponding logical channel.
Up
5.3.5.5.4  RLC bearer addition/modification  p. 113
For each RLC-BearerConfig received in the rlc-BearerToAddModList IE the UE shall:
1 >
if the UE's current configuration contains an RLC bearer with the received logicalChannelIdentity/LogicalChannelIdentityExt within the same cell group:
2 >
if the RLC bearer is associated with an DAPS bearer, or
2 >
if any DAPS bearer is configured and the RLC bearer is associated with an SRB:
3 >
reconfigure the RLC entity or entities for the target cell group in accordance with the received rlc-Config;
3 >
reconfigure the logical channel for the target cell group in accordance with the received mac-LogicalChannelConfig;
2 >
else:
3 >
if reestablishRLC is received:
4 >
re-establish the RLC entity as specified in TS 38.322;
3 >
reconfigure the RLC entity or entities in accordance with the received rlc-Config;
3 >
reconfigure the logical channel in accordance with the received mac-LogicalChannelConfig;
3 >
if servedMBS-RadioBearer is received:
4 >
associate this logical channel with the PDCP entity identified by servedMBS-RadioBearer;
1 >
else (a logical channel with the given logicalChannelIdentity/LogicalChannelIdentityExt is not configured within the same cell group, including the case when full configuration option is used):
2 >
if the servedRadioBearer associates the logical channel with an SRB and rlc-Config is not included:
3 >
establish an RLC entity in accordance with the default configuration defined in clause 9.2 for the corresponding SRB;
2 >
else:
3 >
establish an RLC entity in accordance with the received rlc-Config;
2 >
if the servedRadioBearer associates the logical channel with an SRB and if mac-LogicalChannelConfig is not included:
3 >
configure this MAC entity with a logical channel in accordance to the default configuration defined in clause 9.2 for the corresponding SRB;
2 >
else:
3 >
configure this MAC entity with a logical channel in accordance to the received mac-LogicalChannelConfig;
2 >
associate this logical channel with the PDCP entity identified by servedRadioBearer or servedMBS-RadioBearer.
Up
5.3.5.5.5  MAC entity configuration  p. 114
The UE shall:
1 >
if SCG MAC is not part of the current UE configuration (i.e. SCG establishment):
2 >
create an SCG MAC entity;
1 >
if any DAPS bearer is configured:
2 >
reconfigure the MAC main configuration for the target cell group in accordance with the received mac-CellGroupConfig excluding tag-ToReleaseList and tag-ToAddModList;
1 >
else:
2 >
reconfigure the MAC main configuration of the cell group in accordance with the received mac-CellGroupConfig excluding tag-ToReleaseList and tag-ToAddModList;
1 >
if the received mac-CellGroupConfig includes the tag-ToReleaseList:
2 >
for each TAG-Id value included in the tag-ToReleaseList that is part of the current UE configuration:
3 >
release the TAG indicated by TAG-Id;
1 >
if the received mac-CellGroupConfig includes the tag-ToAddModList:
2 >
for each tag-Id value included in tag-ToAddModList that is not part of the current UE configuration (TAG addition):
3 >
add the TAG, corresponding to the tag-Id, in accordance with the received timeAlignmentTimer;
2 >
for each tag-Id value included in tag-ToAddModList that is part of the current UE configuration (TAG modification):
3 >
reconfigure the TAG, corresponding to the tag-Id, in accordance with the received timeAlignmentTimer.
Up
5.3.5.5.6  RLF Timers & Constants configuration  p. 114
The UE shall:
1 >
if the received rlf-TimersAndConstants is set to release:
2 >
if any DAPS bearer is configured:
3 >
use values for timers T301, T310, T311 and constants N310, N311 for the target cell group, as included in ue-TimersAndConstants received in SIB1;
2 >
else:
3 >
use values for timers T301, T310, T311 and constants N310, N311, as included in ue-TimersAndConstants received in SIB1;
1 >
else:
2 >
if any DAPS bearer is configured:
3 >
configure the value of timers and constants for the target cell group in accordance with received rlf-TimersAndConstants;
2 >
else:
3 >
(re-)configure the value of timers and constants in accordance with received rlf-TimersAndConstants;
3 >
stop timer T310 for this cell group, if running;
3 >
stop timer T312 for this cell group, if running;
3 >
reset the counters N310 and N311.
Up
5.3.5.5.7  SpCell Configuration  p. 115
The UE shall:
1 >
if the UE is acting as L2 U2N Remote UE and is not configured with MP:
2 >
if the SpCellConfig contains the rlf-TimersAndConstants which is set to setup:
3 >
use value for timers T311 as received in rlf-TimersAndConstants;
2 >
else if rlf-TimersAndConstants is not configured for this cell group or SpCellConfig contains the rlf-TimersAndConstants which is set to release:
3 >
use value for timers T311, as included in ue-TimersAndConstants received in SIB1;
1 >
else
2 >
if the SpCellConfig contains the rlf-TimersAndConstants:
3 >
configure the RLF timers and constants for this cell group as specified in clause 5.3.5.5.6;
2 >
else if rlf-TimersAndConstants is not configured for this cell group:
3 >
if any DAPS bearer is configured:
4 >
use values for timers T301, T310, T311 and constants N310, N311 for the target cell group, as included in ue-TimersAndConstants received in SIB1;
3 >
else
4 >
use values for timers T301, T310, T311 and constants N310, N311, as included in ue-TimersAndConstants received in SIB1;
2 >
if the SpCellConfig contains spCellConfigDedicated:
3 >
configure the SpCell in accordance with the spCellConfigDedicated;
3 >
consider the bandwidth part indicated in firstActiveUplinkBWP-Id, if included in the spCellConfigDedicated, to be the active uplink bandwidth part;
3 >
if the firstActiveDownlinkBWP-Id is included in the spCellConfigDedicated:
4 >
if the SpCellConfig is included in an RRCReconfiguration message contained in an NR or E-UTRA RRC message indicating that the SCG is deactivated:
5 >
consider the bandwidth part indicated in firstActiveDownlinkBWP-Id to be the bandwidth part for Radio Link Monitoring, Beam Failure Detection and measurements;
4 >
else:
5 >
consider the bandwith part indicated in firstActiveDownlinkBWP-Id to be the active downlink bandwidth part;
3 >
if any of the reference signal(s) that are used for radio link monitoring are reconfigured by the received spCellConfigDedicated:
4 >
stop timer T310 for the corresponding SpCell, if running;
4 >
stop timer T312 for the corresponding SpCell, if running;
4 >
reset the counters N310 and N311.
1 >
if the SpCellConfig contains the lowMobilityEvaluationConnected:
2 >
the UE may perform the evaluation of the low mobility criterion for this cell group as specified in clause 5.7.13.1;
1 >
if the SpCellConfig contains the goodServingCellEvaluationRLM:
2 >
the UE may perform the evaluation of the good serving cell quality criterion for this SpCell as specified in clause 5.7.13.2;
1 >
if the SpCellConfig contains the goodServingCellEvaluationBFD:
2 >
the UE may perform the evaluation of the good serving cell quality criterion for this serving cell as specified in clause 5.7.13.2;
Up
5.3.5.5.8  SCell Release  p. 116
The UE shall:
1 >
if the release is triggered by reception of the sCellToReleaseList:
2 >
for each sCellIndex value included in the sCellToReleaseList:
3 >
if the current UE configuration includes an SCell with value sCellIndex:
4 >
release the SCell.
5.3.5.5.9  SCell Addition/Modification  p. 116
The UE shall:
1 >
for each sCellIndex value included in the sCellToAddModList that is not part of the current UE configuration (SCell addition):
2 >
add the SCell, corresponding to the sCellIndex, in accordance with the sCellConfigCommon and sCellConfigDedicated;
2 >
if the sCellState is included:
3 >
configure lower layers to consider the SCell to be in activated state;
2 >
else:
3 >
configure lower layers to consider the SCell to be in deactivated state;
2 >
for each measId included in the measIdList within VarMeasConfig:
3 >
if SCells are not applicable for the associated measurement; and
3 >
if the concerned SCell is included in cellsTriggeredList defined within the VarMeasReportList for this measId:
4 >
remove the concerned SCell from cellsTriggeredList defined within the VarMeasReportList for this measId;
2 >
if the SCellConfig contains the goodServingCellEvaluationBFD:
3 >
the UE may perform the evaluation of the good serving cell quality criterion for this serving cell as specified in clause 5.7.13.2.
1 >
for each sCellIndex value included in the sCellToAddModList that is part of the current UE configuration (SCell modification):
2 >
modify the SCell configuration in accordance with the sCellConfigDedicated;
2 >
if the sCellToAddModList was received in an RRCReconfiguration message including reconfigurationWithSync, or received in an RRCResume message, or received in an RRCReconfiguration message including reconfigurationWithSync embedded in an RRCResume message or embedded in an RRCReconfiguration message or embedded in an E-UTRA RRCConnectionReconfiguration message or embedded in an E-UTRA RRCConnectionResume message, or received in an RRCReconfiguration message embedded in an RRCReconfiguration message or embedded in an E-UTRA RRCConnectionReconfiguration message activating deactivated SCG:
3 >
if the sCellState is included:
4 >
configure lower layers to consider the SCell to be in activated state;
3 >
else:
4 >
configure lower layers to consider the SCell to be in deactivated state.
2 >
if the SCellConfig contains the goodServingCellEvaluationBFD:
3 >
the UE may perform the evaluation of the good serving cell quality criterion for this serving cell as specified in clause 5.7.13.2.
Up
5.3.5.5.10  BH RLC channel release  p. 117
The IAB-node shall:
1 >
for each BH-RLC-ChannelID value included in the bh-RLC-ChannelToReleaseList that is part of the current IAB-node configuration within the same cell group (LCH release); or
1 >
for each BH-RLC-ChannelID value that is to be released as the result of an SCG release according to clause 5.3.5.4:
2 >
release the RLC entity or entities as specified in clause 5.1.3 of TS 38.322;
2 >
release the corresponding logical channel.
Up
5.3.5.5.11  BH RLC channel addition/modification  p. 117
For each BH-RLC-ChannelConfig received in the bh-RLC-ChannelToAddModList IE the IAB-node shall:
1 >
if the current configuration contains a BH RLC Channel with the received bh-RLC-ChannelID within the same cell group:
2 >
if reestablishRLC is received:
3 >
re-establish the RLC entity as specified in TS 38.322;
2 >
reconfigure the RLC entity or entities in accordance with the received rlc-Config;
2 >
reconfigure the logical channel in accordance with the received mac-LogicalChannelConfig;
1 >
else (a backhaul logical channel with the given BH-RLC-ChannelID was not configured before within the same cell group):
2 >
establish an RLC entity in accordance with the received rlc-Config;
2 >
configure this MAC entity with a logical channel in accordance to the received mac-LogicalChannelConfig.
Up
5.3.5.5.12  Uu Relay RLC channel release  p. 118
The L2 U2N Relay UE or N3C relay UE shall:
1 >
for each Uu-RelayRLC-ChannelID value included in the uu-RelayRLC-ChannelToReleaseList that is part of the current configuration within the same cell group (LCH release):
2 >
release the RLC entity as specified in clause 5.1.3 of TS 38.322;
2 >
release the corresponding logical channel.
5.3.5.5.13  Uu Relay RLC channel addition/modification  p. 118
For each Uu-RelayRLC-ChannelConfig received in the uu-RelayRLC-ChannelToAddModList the L2 U2N Relay UE or N3C relay UE shall:
1 >
if the current configuration contains a Uu Relay RLC channel with the same uu-RelayRLC-ChannelID within the same cell group:
2 >
if reestablishRLC is received:
3 >
re-establish the RLC entity as specified in TS 38.322;
2 >
reconfigure the RLC entity in accordance with the received rlc-Config;
2 >
reconfigure the logical channel in accordance with the received mac-LogicalChannelConfig;
1 >
else (a logical channel with the given uu-RelayRLC-ChannelID was not configured before within the same cell group):
2 >
establish an RLC entity in accordance with the received rlc-Config;
2 >
configure this MAC entity with a logical channel in accordance to the received mac-LogicalChannelConfig.
Up
5.3.5.5.14  NCR-Fwd configuration  p. 118
The NCR-MT shall:
1 >
if NCR-FwdConfig is set to setup:
2 >
if NCR-FwdConfig includes periodic forwarding resource configuration:
3 >
indicate to NCR-Fwd to forward in accordance with the configured periodic forwarding resource set(s);
1 >
else (NCR-FwdConfig is set to release):
2 >
release NCR-Fwd configuration;
2 >
indicate to NCR-Fwd to cease forwarding.

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