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Content for  TS 38.331  Word version:  17.3.0

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5.3.5 RRC reconfiguration  5.3.5.1 General  5.3.5.2 Initiation  5.3.5.3 Reception of an RRCReconfiguration by the UE  5.3.5.4 Secondary cell group release 
...

 

5.3.5  RRC reconfiguration  p. 73

5.3.5.1  General  p. 73

Reproduction of 3GPP TS 38.331, Fig. 5.3.5.1-1: RRC reconfiguration, successful
Figure 5.3.5.1-1: RRC reconfiguration, successful
Up
Reproduction of 3GPP TS 38.331, Fig. 5.3.5.1-2: RRC reconfiguration, failure
Figure 5.3.5.1-2: RRC reconfiguration, failure
Up
The purpose of this procedure is to modify an RRC connection, e.g. to establish/modify/release RBs/BH RLC channels/Uu Relay RLC channels/PC5 Relay RLC channels, to perform reconfiguration with sync, to setup/modify/release measurements, to add/modify/release SCells and cell groups, to add/modify/release conditional handover configuration, to add/modify/release conditional PSCell change or conditional PSCell addition configuration. As part of the procedure, NAS dedicated information may be transferred from the Network to the UE.
RRC reconfiguration to perform reconfiguration with sync includes, but is not limited to, the following cases:
  • reconfiguration with sync and security key refresh, involving RA to the PCell/PSCell, MAC reset, refresh of security and re-establishment of RLC and PDCP triggered by explicit L2 indicators;
  • reconfiguration with sync but without security key refresh, involving RA to the PCell/PSCell, MAC reset and RLC re-establishment and PDCP data recovery (for AM DRB or AM MRB) triggered by explicit L2 indicators.
  • reconfiguration with sync for DAPS and security key refresh, involving RA to the target PCell, establishment of target MAC, and
    • for non-DAPS bearer: refresh of security and re-establishment of RLC and PDCP triggered by explicit L2 indicators;
    • for DAPS bearer: establishment of RLC for the target PCell, refresh of security and reconfiguration of PDCP to add the ciphering function, the integrity protection function and ROHC function of the target PCell;
    • for SRB: refresh of security and establishment of RLC and PDCP for the target PCell;
  • reconfiguration with sync for DAPS but without security key refresh, involving RA to the target PCell, establishment of target MAC, and
    • for non-DAPS bearer: RLC re-establishment and PDCP data recovery (for AM DRB or AM MRB) triggered by explicit L2 indicators.
    • for DAPS bearer: establishment of RLC for target PCell, reconfiguration of PDCP to add the ciphering function, the integrity protection function and ROHC function of the target PCell;
    • for SRB: establishment of RLC and PDCP for the target PCell.
  • reconfiguration with sync for direct-to-indirect path switch, not involving RA at target side, involving re-establishment of PDCP /PDCP data recovery (for AM DRB) triggered by explicit L2 indicators.
In (NG)EN-DC and NR-DC, SRB3 can be used for measurement configuration and reporting, for UE assistance (re-)configuration and reporting for power savings, for IP address (re-)configuration and reporting for IAB-nodes, to (re-)configure MAC, RLC, BAP, physical layer and RLF timers and constants of the SCG configuration, and to reconfigure PDCP for DRBs associated with the S-KgNB or SRB3, and to reconfigure SDAP for DRBs associated with S-KgNB in NGEN-DC and NR-DC, and to add/modify/release conditional PSCell change configuration, provided that the (re-)configuration does not require any MN involvement, and to transmit RRC messages between the MN and the UE during fast MCG link recovery. In (NG)EN-DC and NR-DC, only measConfig, radioBearerConfig, conditionalReconfiguration, bap-Config, iab-IP-AddressConfigurationList, otherConfig and/or secondaryCellGroup are included in RRCReconfiguration received via SRB3, except when RRCReconfiguration is received within DLInformationTransferMRDC.
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5.3.5.2  Initiation  p. 74

The Network may initiate the RRC reconfiguration procedure to a UE in RRC_CONNECTED. The Network applies the procedure as follows:
  • the establishment of RBs (other than SRB1, that is established during RRC connection establishment) is performed only when AS security has been activated;
  • the establishment of BH RLC Channels for IAB is performed only when AS security has been activated;
  • the establishment of Uu Relay RLC channels and PC5 Relay RLC channels (other than SL-RLC0 and SL-RLC1) for L2 U2N Relay UE is performed only when AS security has been activated, and the establishment of PC5 Relay RLC channels for L2 U2N Remote UE (other than SL-RLC0 and SL-RLC1) is performed only when AS security has been activated;
  • the addition of Secondary Cell Group and SCells is performed only when AS security has been activated;
  • the reconfigurationWithSync is included in secondaryCellGroup only when at least one RLC bearer or BH RLC channel is setup in SCG;
  • the reconfigurationWithSync is included in masterCellGroup only when AS security has been activated, and SRB2 with at least one DRB or multicast MRB or, for IAB, SRB2, are setup and not suspended;
  • the conditionalReconfiguration for CPC is included only when at least one RLC bearer is setup in SCG;
  • the conditionalReconfiguration for CHO or CPA is included only when AS security has been activated, and SRB2 with at least one DRB or multicast MRB or, for IAB, SRB2, are setup and not suspended.
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5.3.5.3  Reception of an RRCReconfiguration by the UE  p. 75

The UE shall perform the following actions upon reception of the RRCReconfiguration, or upon execution of the conditional reconfiguration (CHO, CPA or CPC):
1 >
if the RRCReconfiguration is applied due to a conditional reconfiguration execution upon cell selection performed while timer T311 was running, as defined in clause 5.3.7.3:
2 >
remove all the entries within the MCG and the SCG VarConditionalReconfig, if any;
1 >
if the RRCReconfiguration includes the daps-SourceRelease:
2 >
reset the source MAC and release the source MAC configuration;
2 >
for each DAPS bearer:
3 >
release the RLC entity or entities as specified in TS 38.322, clause 5.1.3, and the associated logical channel for the source SpCell;
3 >
reconfigure the PDCP entity to release DAPS as specified in TS 38.323;
2 >
for each SRB:
3 >
release the PDCP entity for the source SpCell;
3 >
release the RLC entity as specified in TS 38.322, clause 5.1.3, and the associated logical channel for the source SpCell;
2 >
release the physical channel configuration for the source SpCell;
2 >
discard the keys used in the source SpCell (the KgNB key, the KRRCenc key, the KRRCint key, the KUPint key and the KUPenc key), if any;
1 >
if the RRCReconfiguration is received via other RAT (i.e., inter-RAT handover to NR):
2 >
if the RRCReconfiguration does not include the fullConfig and the UE is connected to 5GC (i.e., delta signalling during intra 5GC handover):
3 >
re-use the source RAT SDAP and PDCP configurations if available (i.e., current SDAP/PDCP configurations for all RBs from source E-UTRA RAT prior to the reception of the inter-RAT HO RRCReconfiguration message);
1 >
else:
2 >
if the RRCReconfiguration includes the fullConfig:
3 >
perform the full configuration procedure as specified in clause 5.3.5.11;
1 >
if the RRCReconfiguration includes the masterCellGroup:
2 >
perform the cell group configuration for the received masterCellGroup according to clause 5.3.5.5;
1 >
if the RRCReconfiguration includes the masterKeyUpdate:
2 >
perform AS security key update procedure as specified in clause 5.3.5.7;
1 >
if the RRCReconfiguration includes the sk-Counter:
2 >
perform security key update procedure as specified in clause 5.3.5.7;
1 >
if the RRCReconfiguration includes the secondaryCellGroup:
2 >
perform the cell group configuration for the SCG according to clause 5.3.5.5;
1 >
if the RRCReconfiguration includes the mrdc-SecondaryCellGroupConfig:
2 >
if the mrdc-SecondaryCellGroupConfig is set to setup:
3 >
if the mrdc-SecondaryCellGroupConfig includes mrdc-ReleaseAndAdd:
4 >
perform MR-DC release as specified in clause 5.3.5.10;
3 >
if the received mrdc-SecondaryCellGroup is set to nr-SCG:
4 >
perform the RRC reconfiguration according to clause 5.3.5.3 for the RRCReconfiguration message included in nr-SCG;
3 >
if the received mrdc-SecondaryCellGroup is set to eutra-SCG:
4 >
perform the RRC connection reconfiguration as specified in TS 36.331, clause 5.3.5.3 for the RRCConnectionReconfiguration message included in eutra-SCG;
2 >
else (mrdc-SecondaryCellGroupConfig is set to release):
3 >
perform MR-DC release as specified in clause 5.3.5.10;
1 >
if the RRCReconfiguration message includes the radioBearerConfig:
2 >
perform the radio bearer configuration according to clause 5.3.5.6;
1 >
if the RRCReconfiguration message includes the radioBearerConfig2:
2 >
perform the radio bearer configuration according to clause 5.3.5.6;
1 >
if the RRCReconfiguration message includes the measConfig:
2 >
perform the measurement configuration procedure as specified in clause 5.5.2;
1 >
if the RRCReconfiguration message includes the dedicatedNAS-MessageList:
2 >
forward each element of the dedicatedNAS-MessageList to upper layers in the same order as listed;
1 >
if the RRCReconfiguration message includes the dedicatedSIB1-Delivery:
2 >
perform the action upon reception of SIB1 as specified in clause 5.2.2.4.2;
1 >
if the RRCReconfiguration message includes the dedicatedSystemInformationDelivery:
2 >
perform the action upon reception of System Information as specified in clause 5.2.2.4;
1 >
if the RRCReconfiguration message includes the dedicatedPosSysInfoDelivery:
2 >
perform the action upon reception of the contained posSIB(s), as specified in clause 5.2.2.4.16;
1 >
if the RRCReconfiguration message includes the otherConfig:
2 >
perform the other configuration procedure as specified in clause 5.3.5.9;
1 >
if the RRCReconfiguration message includes the bap-Config:
2 >
perform the BAP configuration procedure as specified in clause 5.3.5.12;
1 >
if the RRCReconfiguration message includes the iab-IP-AddressConfigurationList:
2 >
if iab-IP-AddressToReleaseList is included:
3 >
perform release of IP address as specified in clause 5.3.5.12a.1.1;
2 >
if iab-IP-AddressToAddModList is included:
3 >
perform IAB IP address addition/update as specified in clause 5.3.5.12a.1.2;
1 >
if the RRCReconfiguration message includes the conditionalReconfiguration:
2 >
perform conditional reconfiguration as specified in clause 5.3.5.13;
1 >
if the RRCReconfiguration message includes the needForGapsConfigNR:
2 >
if needForGapsConfigNR is set to setup:
3 >
consider itself to be configured to provide the measurement gap requirement information of NR target bands;
2 >
else:
3 >
consider itself not to be configured to provide the measurement gap requirement information of NR target bands;
1 >
if the RRCReconfiguration message includes the needForGapNCSG-ConfigNR:
2 >
if needForGapNCSG-ConfigNR is set to setup:
3 >
consider itself to be configured to provide the measurement gap and NCSG requirement information of NR target bands;
2 >
else:
3 >
consider itself not to be configured to provide the measurement gap and NCSG requirement information of NR target bands;
1 >
if the RRCReconfiguration message includes the needForGapNCSG-ConfigEUTRA:
2 >
if needForGapNCSG-ConfigEUTRA is set to setup:
3 >
consider itself to be configured to provide the measurement gap and NCSG requirement information of E-UTRA target bands;
2 >
else:
3 >
consider itself not to be configured to provide the measurement gap and NCSG requirement information of E-UTRA target bands;
1 >
if the RRCReconfiguration message includes the sl-ConfigDedicatedNR:
2 >
perform the sidelink dedicated configuration procedure as specified in clause 5.3.5.14;
1 >
if the RRCReconfiguration message includes the sl-L2RelayUE-Config:
2 >
perform the L2 U2N Relay UE configuration procedure as specified in clause 5.3.5.15;
1 >
if the RRCReconfiguration message includes the sl-L2RemoteUE-Config:
2 >
perform the L2 U2N Remote UE configuration procedure as specified in clause 5.3.5.16;
1 >
if the RRCReconfiguration message includes the dedicatedPagingDelivery:
2 >
perform the Paging message reception procedure as specified in clause 5.3.2.3;
1 >
if the RRCReconfiguration message includes the sl-ConfigDedicatedEUTRA-Info:
2 >
perform related procedures for V2X sidelink communication in accordance with TS 36.331, clause 5.3.10clause 5.5.2;
1 >
if the RRCReconfiguration message includes the ul-GapFR2-Config:
2 >
perform the FR2 UL gap configuration procedure as specified in clause 5.3.5.13c;
1 >
if the RRCReconfiguration message includes the musim-GapConfig:
2 >
perform the MUSIM gap configuration procedure as specified in clause 5.3.5.9a;
1 >
if the RRCReconfiguration message includes the appLayerMeasConfig:
2 >
perform the application layer measurement configuration procedure as specified in clause 5.3.5.13d;
1 >
if the RRCReconfiguration message includes the ue-TxTEG-RequestUL-TDOA-Config:
2 >
if ue-TxTEG-RequestUL-TDOA-Config is set to setup:
3 >
perform the UE positioning assistance information procedure as specified in clause 5.7.14;
2 >
else:
3 >
release the configuration of UE positioning assistance information;
1 >
set the content of the RRCReconfigurationComplete message as follows:
2 >
if the RRCReconfiguration includes the masterCellGroup containing the reportUplinkTxDirectCurrent:
3 >
include the uplinkTxDirectCurrentList for each MCG serving cell with UL;
3 >
include uplinkDirectCurrentBWP-SUL for each MCG serving cell configured with SUL carrier, if any, within the uplinkTxDirectCurrentList;
2 >
if the RRCReconfiguration includes the masterCellGroup containing the reportUplinkTxDirectCurrentTwoCarrier:
3 >
include in the uplinkTxDirectCurrentTwoCarrierList the list of uplink Tx DC locations for the configured intra-band uplink carrier aggregation in the MCG;
2 >
if the RRCReconfiguration includes the masterCellGroup containing the reportUplinkTxDirectCurrentMoreCarrier:
3 >
include in the uplinkTxDirectCurrentMoreCarrierList the list of uplink Tx DC locations for the configured intra-band uplink carrier aggregation in the MCG;
2 >
if the RRCReconfiguration includes the secondaryCellGroup containing the reportUplinkTxDirectCurrent:
3 >
include the uplinkTxDirectCurrentList for each SCG serving cell with UL;
3 >
include uplinkDirectCurrentBWP-SUL for each SCG serving cell configured with SUL carrier, if any, within the uplinkTxDirectCurrentList;
2 >
if the RRCReconfiguration includes the secondaryCellGroup containing the reportUplinkTxDirectCurrentTwoCarrier:
3 >
include in the uplinkTxDirectCurrentTwoCarrierList the list of uplink Tx DC locations for the configured intra-band uplink carrier aggregation in the SCG;
2 >
if the RRCReconfiguration includes the secondaryCellGroup containing the reportUplinkTxDirectCurrentMoreCarrier:
3 >
include in the uplinkTxDirectCurrentMoreCarrierList the list of uplink Tx DC locations for the configured intra-band uplink carrier aggregation in the SCG;
2 >
if the RRCReconfiguration message includes the mrdc-SecondaryCellGroupConfig with mrdc-SecondaryCellGroup set to eutra-SCG:
3 >
include in the eutra-SCG-Response the E-UTRA RRCConnectionReconfigurationComplete message in accordance with TS 36.331, clause 5.3.5.3;
2 >
if the RRCReconfiguration message includes the mrdc-SecondaryCellGroupConfig with mrdc-SecondaryCellGroup set to nr-SCG:
3 >
include in the nr-SCG-Response the SCG RRCReconfigurationComplete message;
3 >
if the RRCReconfiguration message is applied due to conditional reconfiguration execution and the RRCReconfiguration message does not include the reconfigurationWithSync in the masterCellGroup:
4 >
include in the selectedCondRRCReconfig the condReconfigId for the selected cell of conditional reconfiguration execution;
2 >
if the RRCReconfiguration includes the reconfigurationWithSync in spCellConfig of an MCG:
3 >
if the UE has logged measurements available for NR and if the RPLMN is included in plmn-IdentityList stored in VarLogMeasReport:
4 >
include the logMeasAvailable in the RRCReconfigurationComplete message;
4 >
if Bluetooth measurement results are included in the logged measurements the UE has available for NR:
5 >
include the logMeasAvailableBT in the RRCReconfigurationComplete message;
4 >
if WLAN measurement results are included in the logged measurements the UE has available for NR:
5 >
include the logMeasAvailableWLAN in the RRCReconfigurationComplete message;
3 >
if the sigLoggedMeasType in VarLogMeasReport is included:
4 >
if T330 timer is running and the logged measurements configuration is for NR:
5 >
set sigLogMeasConfigAvailable to true in the RRCReconfigurationComplete message;
4 >
else:
5 >
if the UE has logged measurements available for NR:
6 >
set sigLogMeasConfigAvailable to false in the RRCReconfigurationComplete message;
3 >
if the UE has connection establishment failure or connection resume failure information available in VarConnEstFailReport or VarConnEstFailReportList and if the RPLMN is equal to plmn-Identity stored in VarConnEstFailReport or in at least one of the entries of VarConnEstFailReportList:
4 >
include connEstFailInfoAvailable in the RRCReconfigurationComplete message;
3 >
if the UE has radio link failure or handover failure information available in VarRLF-Report and if the RPLMN is included in plmn-IdentityList stored in VarRLF-Report; or
3 >
if the UE has radio link failure or handover failure information available in VarRLF-Report of TS 36.331 and if the UE is capable of cross-RAT RLF reporting and if the RPLMN is included in plmn-IdentityList stored in VarRLF-Report of TS 36.331:
4 >
include rlf-InfoAvailable in the RRCReconfigurationComplete message;
3 >
if the UE was configured with successHO-Config when connected to the source PCell; and
3 >
if the applied RRCReconfiguration is not due to a conditional reconfiguration execution upon cell selection performed while timer T311 was running, as defined in clause 5.3.7.3:
4 >
perform the actions for the successful handover report determination as specified in clause 5.7.10.6, upon successfully completing the Random Access procedure triggered for the reconfigurationWithSync in spCellConfig of the MCG;
3 >
if the UE has successful handover information available in VarSuccessHO-Report and if the RPLMN is included in plmn-IdentityList stored in VarSuccessHO-Report:
4 >
include successHO-InfoAvailable in the RRCReconfigurationComplete message;
2 >
if the RRCReconfiguration message was received via SRB1, but not within mrdc-SecondaryCellGroup or E-UTRA RRCConnectionReconfiguration or E-UTRA RRCConnectionResume:
3 >
if the UE is configured to provide the measurement gap requirement information of NR target bands:
4 >
if the RRCReconfiguration message includes the needForGapsConfigNR; or
4 >
if the NeedForGapsInfoNR information is changed compared to last time the UE reported this information:
5 >
include the NeedForGapsInfoNR and set the contents as follows:
6 >
include intraFreq-needForGap and set the gap requirement information of intra-frequency measurement for each NR serving cell;
6 >
if requestedTargetBandFilterNR is configured:
7 >
for each supported NR band that is also included in requestedTargetBandFilterNR, include an entry in interFreq-needForGap and set the gap requirement information for that band;
6 >
else:
7 >
include an entry in interFreq-needForGap and set the corresponding gap requirement information for each supported NR band;
3 >
if the UE is configured to provide the measurement gap and NCSG requirement information of NR target bands:
4 >
if the RRCReconfiguration message includes the needForGapNCSG-ConfigNR; or
4 >
if the needForGapNCSG-InfoNR information is changed compared to last time the UE reported this information:
5 >
include the NeedForGapNCSG-InfoNR and set the contents as follows:
6 >
include intraFreq-needForNCSG and set the gap and NCSG requirement information of intra-frequency measurement for each NR serving cell;
6 >
if requestedTargetBandFilterNCSG-NR is configured:
7 >
for each supported NR band included in requestedTargetBandFilterNCSG-NR, include an entry in interFreq-needForNCSG and set the NCSG requirement information for that band;
6 >
else:
7 >
include an entry for each supported NR band in interFreq-needForNCSG and set the corresponding NCSG requirement information;
3 >
if the UE is configured to provide the measurement gap and NCSG requirement information of E-UTRA target bands:
4 >
if the RRCReconfiguration message includes the needForGapNCSG-ConfigEUTRA; or
4 >
if the needForGapNCSG-InfoEUTRA information is changed compared to last time the UE reported this information:
5 >
include the NeedForGapNCSG-InfoEUTRA and set the contents as follows:
6 >
if requestedTargetBandFilterNCSG-EUTRA is configured, for each supported E-UTRA band included in requestedTargetBandFilterNCSG-EUTRA, include an entry in needForNCSG-EUTRA and set the NCSG requirement information for that band; otherwise, include an entry for each supported E-UTRA band in needForNCSG-EUTRA and set the corresponding NCSG requirement information;
1 >
if the UE is configured with E-UTRA nr-SecondaryCellGroupConfig (UE in (NG)EN-DC):
2 >
if the RRCReconfiguration message was received via E-UTRA SRB1 as specified in TS 36.331; or
2 >
if the RRCReconfiguration message was received via E-UTRA RRC message RRCConnectionReconfiguration within MobilityFromNRCommand (handover from NR standalone to (NG)EN-DC);
3 >
if the RRCReconfiguration is applied due to a conditional reconfiguration execution for CPC which is configured via conditionalReconfiguration contained in nr-SecondaryCellGroupConfig specified in TS 36.331:
4 >
submit the RRCReconfigurationComplete message via the E-UTRA MCG embedded in E-UTRA RRC message ULInformationTransferMRDC as specified in TS 36.331, clause 5.6.2a.
3 >
else if the RRCReconfiguration message was included in E-UTRA RRCConnectionResume message:
4 >
submit the RRCReconfigurationComplete message via E-UTRA embedded in E-UTRA RRC message RRCConnectionResumeComplete as specified in TS 36.331, clause 5.3.3.4a;
3 >
else:
4 >
submit the RRCReconfigurationComplete via E-UTRA embedded in E-UTRA RRC message RRCConnectionReconfigurationComplete as specified in TS 36.331, clause 5.3.5.3 / 5.3.5.4 / 5.4.2.3;
3 >
if the scg-State is not included in the E-UTRA message (RRCConnectionReconfiguration or RRCConnectionResume) containing the RRCReconfiguration message:
4 >
perform SCG activation as specified in clause 5.3.5.13a;
4 >
if reconfigurationWithSync was included in spCellConfig of an SCG:
5 >
initiate the Random Access procedure on the PSCell, as specified in TS 38.321;
4 >
else if the SCG was deactivated before the reception of the E-UTRA RRC message containing the RRCReconfiguration message:
5 >
if bfd-and-RLM was not configured to true before the reception of the E-UTRA RRCConnectionReconfiguration or RRCConnectionResume message containing the RRCReconfiguration message or if lower layers indicate that a Random Access procedure is needed for SCG activation:
6 >
initiate the Random Access procedure on the SpCell, as specified in TS 38.321;
5 >
else the procedure ends;
4 >
else the procedure ends;
3 >
else:
4 >
perform SCG deactivation as specified in clause 5.3.5.13b;
4 >
the procedure ends;
2 >
if the RRCReconfiguration message was received within nr-SecondaryCellGroupConfig in RRCConnectionReconfiguration message received via SRB3 within DLInformationTransferMRDC:
3 >
submit the RRCReconfigurationComplete via E-UTRA embedded in E-UTRA RRC message RRCConnectionReconfigurationComplete as specified in TS 36.331, clause 5.3.5.3 / 5.3.5.4;
3 >
if the scg-State is not included in the RRCConnectionReconfiguration:
4 >
if reconfigurationWithSync was included in spCellConfig of an SCG:
5 >
initiate the Random Access procedure on the SpCell, as specified in TS 38.321;
4 >
else the procedure ends;
3 >
else:
4 >
perform SCG deactivation as specified in clause 5.3.5.13b;
4 >
the procedure ends;
2 >
else (RRCReconfiguration was received via SRB3) but not within DLInformationTransferMRDC:
3 >
submit the RRCReconfigurationComplete message via SRB3 to lower layers for transmission using the new configuration;
1 >
else if the RRCReconfiguration message was received via SRB1 within the nr-SCG within mrdc-SecondaryCellGroup (UE in NR-DC, mrdc-SecondaryCellGroup was received in RRCReconfiguration or RRCResume via SRB1):
2 >
if the RRCReconfiguration is applied due to a conditional reconfiguration execution for CPC which is configured via conditionalReconfiguration contained in nr-SCG within mrdc-SecondaryCellGroup:
3 >
submit the RRCReconfigurationComplete message via the NR MCG embedded in NR RRC message ULInformationTransferMRDC as specified in clause 5.7.2a.3.
2 >
if the scg-State is not included in the RRCReconfiguration or RRCResume message containing the RRCReconfiguration message:
3 >
perform SCG activation as specified in clause 5.3.5.13a;
3 >
if reconfigurationWithSync was included in spCellConfig in nr-SCG:
4 >
initiate the Random Access procedure on the PSCell, as specified in TS 38.321;
3 >
else if the SCG was deactivated before the reception of the NR RRC message containing the RRCReconfiguration message:
4 >
if bfd-and-RLM was not configured to true before the reception of the RRCReconfiguration or RRCResume message containing the RRCReconfiguration message; or
4 >
if lower layers indicate that a Random Access procedure is needed for SCG activation:
5 >
initiate the Random Access procedure on the PSCell, as specified in TS 38.321;
4 >
else the procedure ends;
3 >
else the procedure ends;
2 >
else
3 >
perform SCG deactivation as specified in clause 5.3.5.13b;
3 >
the procedure ends;
1 >
else if the RRCReconfiguration message was received via SRB3 (UE in NR-DC):
2 >
if the RRCReconfiguration message was received within DLInformationTransferMRDC:
3 >
if the RRCReconfiguration message was received within the nr-SCG within mrdc-SecondaryCellGroup (NR SCG RRC Reconfiguration):
4 >
if the scg-State is not included in the RRCReconfiguration message containing the RRCReconfiguration message:
5 >
if reconfigurationWithSync was included in spCellConfig in nr-SCG:
6 >
initiate the Random Access procedure on the PSCell, as specified in TS 38.321;
5 >
else:
6 >
the procedure ends;
4 >
else:
5 >
perform SCG deactivation as specified in clause 5.3.5.13b;
5 >
the procedure ends;
3 >
else:
4 >
if the RRCReconfiguration does not include the mrdc-SecondaryCellGroupConfig:
5 >
if the RRCReconfiguration includes the scg-State:
6 >
perform SCG deactivation as specified in clause 5.3.5.13b;
4 >
submit the RRCReconfigurationComplete message via SRB1 to lower layers for transmission using the new configuration;
2 >
else:
3 >
submit the RRCReconfigurationComplete message via SRB3 to lower layers for transmission using the new configuration;
1 >
else (RRCReconfiguration was received via SRB1):
2 >
if the UE is in NR-DC and;
2 >
if the RRCReconfiguration does not include the mrdc-SecondaryCellGroupConfig:
3 >
if the RRCReconfiguration includes the scg-State:
4 >
perform SCG deactivation as specified in clause 5.3.5.13b;
3 >
else:
4 >
perform SCG activation without SN message as specified in clause 5.3.5.13b1;
2 >
if the reconfigurationWithSync was included in spCellConfig of an MCG:
3 >
if ta-Report is configured with value enabled and the UE supports TA reporting:
4 >
indicate TA report initiation to lower layers;
2 >
submit the RRCReconfigurationComplete message via SRB1 to lower layers for transmission using the new configuration;
2 >
if this is the first RRCReconfiguration message after successful completion of the RRC re-establishment procedure:
3 >
resume SRB2, SRB4, DRBs, multicast MRB, and BH RLC channels for IAB-MT, and Uu Relay RLC channels for L2 U2N Relay UE, that are suspended;
1 >
if reconfigurationWithSync was included in spCellConfig of an MCG or SCG and when MAC of an NR cell group successfully completes a Random Access procedure triggered above; or,
1 >
if sl-PathSwitchConfig was included in reconfigurationWithSync included in spCellConfig of an MCG, and when successfully sending RRCReconfigurationComplete message (i.e., PC5 RLC acknowledgement is received from target L2 U2N Relay UE):
2 >
stop timer T304 for that cell group if running;
2 >
if sl-PathSwitchConfig was included in reconfigurationWithSync:
3 >
stop timer T420;
3 >
release all radio resources, including release of the RLC entities and the MAC configuration at the source side;
3 >
reset MAC used in the source cell;
2 >
stop timer T310 for source SpCell if running;
2 >
apply the parts of the CSI reporting configuration, the scheduling request configuration and the sounding RS configuration that do not require the UE to know the SFN of the respective target SpCell, if any;
2 >
apply the parts of the measurement and the radio resource configuration that require the UE to know the SFN of the respective target SpCell (e.g. measurement gaps, periodic CQI reporting, scheduling request configuration, sounding RS configuration), if any, upon acquiring the SFN of that target SpCell;
2 >
for each DRB configured as DAPS bearer, request uplink data switching to the PDCP entity, as specified in TS 38.323;
2 >
if the reconfigurationWithSync was included in spCellConfig of an MCG:
3 >
if T390 is running:
4 >
stop timer T390 for all access categories;
4 >
perform the actions as specified in clause 5.3.14.4.
3 >
if T350 is running:
4 >
stop timer T350;
3 >
if RRCReconfiguration does not include dedicatedSIB1-Delivery and
3 >
if the active downlink BWP, which is indicated by the firstActiveDownlinkBWP-Id for the target SpCell of the MCG, has a common search space configured by searchSpaceSIB1:
4 >
acquire the SIB1, which is scheduled as specified in TS 38.213, of the target SpCell of the MCG;
4 >
upon acquiring SIB1, perform the actions specified in clause 5.2.2.4.2;
2 >
if the reconfigurationWithSync was included in spCellConfig of an MCG; or
2 >
if the reconfigurationWithSync was included in spCellConfig of an SCG and the CPA or CPC was configured:
3 >
remove all the entries within the MCG and the SCG VarConditionalReconfig, if any;
3 >
remove all the entries within VarConditionalReconfiguration as specified in TS 36.331, clause 5.3.5.9.6, if any;
3 >
for each measId of the MCG measConfig, if configured, and for each measId of the SCG measConfig, if configured, if the associated reportConfig has a reportType set to condTriggerConfig:
4 >
for the associated reportConfigId:
5 >
remove the entry with the matching reportConfigId from the reportConfigList within the VarMeasConfig;
4 >
if the associated measObjectId is only associated to a reportConfig with reportType set to condTriggerConfig:
5 >
remove the entry with the matching measObjectId from the measObjectList within the VarMeasConfig;
4 >
remove the entry with the matching measId from the measIdList within the VarMeasConfig;
2 >
if reconfigurationWithSync was included in masterCellGroup or secondaryCellGroup:
3 >
if the UE initiated transmission of a UEAssistanceInformation message for the corresponding cell group during the last 1 second, and the UE is still configured to provide the concerned UE assistance information for the corresponding cell group; or
3 >
if the RRCReconfiguration message is applied due to a conditional reconfiguration execution, and the UE is configured to provide UE assistance information for the corresponding cell group, and the UE has initiated transmission of a UEAssistanceInformation message for the corresponding cell group since it was configured to do so in accordance with clause 5.7.4.2:
4 >
initiate transmission of a UEAssistanceInformation message for the corresponding cell group in accordance with clause 5.7.4.3 to provide the concerned UE assistance information;
4 >
start or restart the prohibit timer (if exists) or the leave without response timer for the MUSIM associated with the concerned UE assistance information with the timer value set to the value in corresponding configuration;
3 >
if SIB12 is provided by the target PCell, and the UE initiated transmission of a SidelinkUEInformationNR message indicating a change of NR sidelink communication/discovery related parameters relevant in target PCell (i.e. change of sl-RxInterestedFreqList or sl-TxResourceReqList) during the last 1 second preceding reception of the RRCReconfiguration message including reconfigurationWithSync in spCellConfig of an MCG; or
3 >
if the RRCReconfiguration message is applied due to a conditional reconfiguration execution and the UE is capable of NR sidelink communication/discovery and SIB12 is provided by the target PCell, and the UE has initiated transmission of a SidelinkUEInformationNR message since it was configured to do so in accordance with clause 5.8.3.2:
4 >
initiate transmission of the SidelinkUEInformationNR message in accordance with clause 5.8.3.3;
2 >
if reconfigurationWithSync was included in masterCellGroup:
3 >
if configured with application layer measurements and if application layer measurement report container has been received from upper layers for which the successful transmission of the message or at least one segment of the message has not been confirmed by lower layers:
4 >
re-submit the MeasurementReportAppLayer message or all segments of the MeasurementReportAppLayer message to lower layers for transmission via SRB4;
2 >
if reconfigurationWithSync was included in masterCellGroup and the target cell provides SIB21:
3 >
if the UE initiated transmission of an MBSInterestIndication message during the last 1 second preceding reception of this RRCReconfiguration message; or
3 >
if the RRCReconfiguration message is applied due to a conditional reconfiguration execution, and the UE has initiated transmission of an MBSInterestIndication message after having received this RRCReconfiguration message:
4 >
initiate transmission of an MBSInterestIndication message in accordance with clause 5.9.4;
2 >
the procedure ends.
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5.3.5.4  Secondary cell group release  p. 86

The UE shall:
1 >
as a result of SCG release triggered by E-UTRA (i.e. (NG)EN-DC case) or NR (i.e. NR-DC case):
2 >
reset SCG MAC, if configured;
2 >
for each RLC bearer that is part of the SCG configuration:
3 >
perform RLC bearer release procedure as specified in clause 5.3.5.5.3;
2 >
for each BH RLC channel that is part of the SCG configuration:
3 >
perform BH RLC channel release procedure as specified in clause 5.3.5.5.10;
2 >
release the SCG configuration;
2 >
remove all the entries within the SCG VarConditionalReconfig, if any;
2 >
if SCG release was triggered by NR (i.e. NR-DC case):
3 >
remove all the entries within the MCG VarConditionalReconfig for which the RRCReconfiguration within condRRCReconfig does not include the masterCellGroup with reconfigurationWithSync, if any;
2 >
else (i.e. EN-DC case):
3 >
perform VarConditionalReconfiguration CPC removal as specified in TS 36.331 clause 5.3.5.9.7;
2 >
stop timer T310 for the corresponding SpCell, if running;
2 >
stop timer T312 for the corresponding SpCell, if running;
2 >
stop timer T304 for the corresponding SpCell, if running.
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