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Content for  TS 38.331  Word version:  17.5.0

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5.8 Sidelink  5.8.1 General  5.8.2 Conditions for NR sidelink communication/discovery operation  5.8.3 Sidelink UE information for NR sidelink communication/discovery  5.8.5 Sidelink synchronisation information transmission for NR sidelink communication/discovery  5.8.5a Sidelink synchronisation information transmission for V2X sidelink communication  5.8.6 Sidelink synchronisation reference  5.8.7 Sidelink communication reception  5.8.8 Sidelink communication transmission 
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5.8  Sidelink |R16|  p. 283

5.8.1  General  p. 283

NR sidelink communication consists of unicast, groupcast and broadcast. For unicast, the PC5-RRC connection is a logical connection between a pair of a Source Layer-2 ID and a Destination Layer-2 ID in the AS. The PC5-RRC signalling, as specified in clause 5.8.9, can be initiated after its corresponding PC5 unicast link establishment (TS 23.287). The PC5-RRC connection and the corresponding sidelink SRBs and sidelink DRB(s) are released when the PC5 unicast link is released as indicated by upper layers.
For each PC5-RRC connection of unicast, one sidelink SRB (i.e. SL-SRB0) is used to transmit the PC5-S message(s) before the PC5-S security has been established. One sidelink SRB (i.e. SL-SRB1) is used to transmit the PC5-S messages to establish the PC5-S security. One sidelink SRB (i.e. SL-SRB2) is used to transmit the PC5-S messages after the PC5-S security has been established, which is protected. One sidelink SRB (i.e. SL-SRB3) is used to transmit the PC5-RRC signalling, which is protected and only sent after the PC5-S security has been established. One sidelink SRB (i.e. SL-SRB4) is used to transmit/receive the NR sidelink discovery messages.
For unicast of NR sidelink communication, AS security comprises of integrity protection of PC5 signalling (SL-SRB1, SL-SRB2 and SL-SRB3) and user data (SL-DRBs), and it further comprises of ciphering of PC5 signaling (SL-SRB1 only for the Direct Link Security Mode Complete message as specified in TS 24.587 for V2X service or TS 24.554 for Proximity-services, SL-SRB2 and SL-SRB3) and user data (SL-DRBs). The ciphering and integrity protection algorithms and parameters for a PC5 unicast link are exchanged by PC5-S messages in the upper layers as specified in TS 33.536, and apply to the corresponding PC5-RRC connection in the AS. Once AS security is activated for a PC5 unicast link in the upper layers as specified in TS 33.536, all messages on SL-SRB2 and SL-SRB3 and/or user data on SL-DRBs of the corresponding PC5-RRC connection are integrity protected and/or ciphered by the PDCP.
For unicast of NR sidelink communication, if the change of the key is indicated by the upper layers as specified in TS 24.587 or TS 24.554, UE re-establishes the PDCP entity of the SL-SRB1, SL-SRB2, SL-SRB3 and SL-DRBs on the corresponding PC5-RRC connection.
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5.8.2  Conditions for NR sidelink communication/discovery operation  p. 284

The UE shall perform NR sidelink communication operation only if the conditions defined in this clause are met:
1 >
if the UE's serving cell is suitable (RRC_IDLE or RRC_INACTIVE or RRC_CONNECTED); and if either the selected cell on the frequency used for NR sidelink communication/discovery operation belongs to the registered or equivalent PLMN as specified in TS 24.587 or TS 24.554 or the UE is out of coverage on the frequency used for NR sidelink communication/discovery operation as defined in TS 38.304 and TS 36.304; or
1 >
if the UE's serving cell (RRC_IDLE or RRC_CONNECTED) fulfils the conditions to support NR sidelink communication/discovery in limited service state as specified in TS 23.287; and if either the serving cell is on the frequency used for NR sidelink communication/discovery operation or the UE is out of coverage on the frequency used for NR sidelink communication/discovery operation as defined in TS 38.304 and TS 36.304; or
1 >
if the UE has no serving cell (RRC_IDLE).
Up

5.8.3  Sidelink UE information for NR sidelink communication/discovery  p. 285

5.8.3.1  General  p. 285

Reproduction of 3GPP TS 38.331, Fig. 5.8.3.1-1: Sidelink UE information for NR sidelink communication/discovery
Figure 5.8.3.1-1: Sidelink UE information for NR sidelink communication/discovery
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The purpose of this procedure is to inform the network that the UE:
  • is interested or no longer interested to receive or transmit NR sidelink communication/discovery,
  • is requesting assignment or release of transmission resource for NR sidelink communication/discovery,
  • is reporting QoS parameters and QoS profile(s) related to NR sidelink communication,
  • is reporting that a sidelink radio link failure or sidelink RRC reconfiguration failure has been detected,
  • is reporting the sidelink UE capability information of the associated peer UE for unicast communication,
  • is reporting the RLC mode information of the sidelink data radio bearer(s) received from the associated peer UE for unicast communication,
  • is reporting the accepted sidelink DRX configuration received from the associated peer UE for NR sidelink unicast reception,
  • is reporting the sidelink DRX assistance information received from the associated peer UE for NR sidelink unicast transmission, when the UE is configured with sl-ScheduledConfig,
  • is reporting, for NR sidelink groupcast transmission, the sidelink DRX on/off indication for the associated Destination Layer-2 ID, when the UE is configured with sl-ScheduledConfig,
  • is reporting, for NR sidelink groupcast or broadcast reception, the Destination Layer-2 ID and QoS profile(s) associated with its interested services to which sidelink DRX is applied,
  • is reporting DRX configuration reject information from its associated peer UE for NR sidelink unicast transmission, when the UE is configured with sl-ScheduledConfig,
  • is reporting parameters related to U2N relay operation.
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5.8.3.2  Initiation  p. 285

A UE capable of NR sidelink communication or NR sidelink discovery or NR sidelink U2N relay operation that is in RRC_CONNECTED may initiate the procedure to indicate it is (interested in) receiving or transmitting NR sidelink communication or NR sidelink discovery or NR sidelink U2N relay operation in several cases including upon successful connection establishment or resuming, upon change of interest, upon changing QoS profile(s), upon receiving UECapabilityInformationSidelink from the associated peer UE, upon RLC mode information updated from the associated peer UE or upon change to a PCell providing SIB12 including sl-ConfigCommonNR. A UE capable of NR sidelink communication may initiate the procedure to request assignment of dedicated sidelink DRB configuration and transmission resources for NR sidelink communication transmission. A UE capable of NR sidelink communication may initiate the procedure to report to the network that a sidelink radio link failure or sidelink RRC reconfiguration failure has been declared. A UE capable of NR sidelink discovery may initiate the procedure to request assignment of dedicated resources for NR sidelink discovery transmission or NR sidelink discovery reception. A UE capable of U2N relay operation may initiate the procedure to report/update parameters for acting as U2N Relay UE or U2N Remote UE (including L2 Remote UE's source L2 ID).
A UE capable of NR sidelink operation that is in RRC_CONNECTED may initiate the procedure to report the sidelink DRX configuration received from the associated peer UE for NR sidelink unicast reception, upon accepting the sidelink DRX configuration from the associated peer UE. A UE capable of NR sidelink communication that is configured with sl-ScheduledConfig and is performing sidelink unicast transmission may initiate the procedure to report the sidelink DRX assistance information or the sidelink DRX configuration reject information received from the associated peer UE, upon receiving either of them from the associated peer UE. A UE capable of NR sidelink communication that is configured with sl-ScheduledConfig and is performing sidelink groupcast transmission may initiate the procedure to report the sidelink DRX on/off indication for the associated Destination Layer-2 ID.
A UE capable of NR sidelink operation that is in RRC_CONNECTED may initiate the procedure to report the Destination Layer-2 ID and QoS profile(s) associated with its interested service(s) that sidelink DRX is applied, for NR sidelink groupcast or broadcast reception.
Upon initiating this procedure, the UE shall:
1 >
if SIB12 including sl-ConfigCommonNR is provided by the PCell:
2 >
ensure having a valid version of SIB12 for the PCell;
2 >
if configured by upper layers to receive NR sidelink communication on the frequency included in sl-FreqInfoList in SIB12 of the PCell:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-RxInterestedFreqList; or if the frequency configured by upper layers to receive NR sidelink communication on has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink communication reception frequency of interest in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-RxInterestedFreqList:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it is no longer interested in NR sidelink communication reception in accordance with clause 5.8.3.3;
2 >
if configured by upper layers to transmit non-relay NR sidelink communication on the frequency included in sl-FreqInfoList in SIB12 of the PCell:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-TxResourceReqList; or if the information carried by the sl-TxResourceReqList has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink communication transmission resources required by the UE in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-TxResourceReqList:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it no longer requires NR sidelink communication transmission resources in accordance with clause 5.8.3.3.
2 >
if configured by upper layer to receive NR sidelink non-relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-NonRelayDiscovery:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR or connected to a PCell providing SIB12 but not including sl-NonRelayDiscovery; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-RxInterestedFreqListDisc; or if the frequency configured by upper layers to receive NR sidelink non-relay discovery messages on has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink discovery reception frequency of interest in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-RxInterestedFreqListDisc:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it is no longer interested in NR sidelink non-relay discovery messages reception in accordance with 5.8.3.3;
2 >
if configured by upper layer to receive NR sidelink L2 U2N relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L2U2N-Relay; or if configured by upper layer to receive NR sidelink L3 U2N relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L3U2N-RelayDiscovery:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR; or connected to a PCell providing SIB12 but not including sl-L2U2N-Relay in case of L2 U2N relay operation; or connected to a PCell providing SIB12 but not including sl-L3U2N-RelayDiscovery in case of L3 U2N relay operation; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-RxInterestedFreqListDisc; or if the frequency configured by upper layers to receive NR sidelink discovery messages on has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
if the UE is capable of U2N Relay UE, and if SIB12 includes sl-RelayUE-ConfigCommon; or
4 >
if the UE is selecting a U2N Relay UE / has a selected U2N Relay UE / configured with measurement object associated to L2 U2N Relay UEs, and if SIB12 includes sl-RemoteUE-ConfigCommon:
5 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR relay sidelink discovery reception frequency of interest in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-RxInterestedFreqListDisc:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it is no longer interested in NR relay sidelink discovery messages reception in accordance with clause 5.8.3.3;
2 >
if configured by upper layer to transmit NR sidelink non-relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-NonRelayDiscovery:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR or connected to a PCell providing SIB12 but not including sl-NonRelayDiscovery; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-TxResourceReqListDisc; or if the information carried by the sl-TxResourceReqListDisc has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink non-relay discovery messages resources required by the UE in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-TxResourceReqListDisc:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it no longer requires NR sidelink non-relay discovery messages resources in accordance with clause 5.8.3.3;
2 >
if configured by upper layer to transmit NR sidelink L2 U2N relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L2U2N-Relay; or if configured by upper layer to transmit NR sidelink L3 U2N relay discovery messages on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L3U2N-RelayDiscovery:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR; or connected to a PCell providing SIB12 but not including sl-L2U2N-Relay in case of L2 U2N relay operation; or connected to a PCell providing SIB12 but not including sl-L3U2N-RelayDiscovery in case of L3 U2N relay operation; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-TxResourceReqListDisc; or if the information carried by the sl-TxResourceReqListDisc has changed since the last transmission of the SidelinkUEInformationNR message:
4 >
if the UE is capable of U2N Relay UE, and if SIB12 includes sl-RelayUE-ConfigCommon, and if the U2N Relay UE threshold conditions as specified in clause 5.8.14.2 are met; or
4 >
if the UE is selecting a U2N Relay UE / has a selected U2N Relay UE, and if SIB12 includes sl-RemoteUE-ConfigCommon, and if the U2N Remote UE threshold conditions as specified in clause 5.8.15.2 are met:
5 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink relay discovery messages resources required by the UE in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-TxResourceReqListDisc:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it no longer requires NR sidelink relay discovery messages resources in accordance with clause 5.8.3.3;
2 >
if configured by upper layer to transmit NR sidelink L2 U2N relay communication on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L2U2N-Relay; or if configured by upper layer to transmit NR sidelink L3 U2N relay communication on the frequency included in sl-FreqInfoList in SIB12 of the PCell including sl-L3U2N-RelayDiscovery:
3 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
3 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-ConfigCommonNR; or connected to a PCell providing SIB12 but not including sl-L2U2N-Relay in case of L2 U2N relay operation; or connected to a PCell providing SIB12 but not including sl-L3U2N-RelayDiscovery in case of L3 U2N relay operation; or
3 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-TxResourceReqL2U2N-Relay; or if the information carried by the sl-TxResourceReqL2U2N-Relay has changed since the last transmission of the SidelinkUEInformationNR message; or if the last transmission of the SidelinkUEInformationNR message did not include sl-TxResourceReqL3U2N-Relay; or if the information carried by the sl-TxResourceReqL3U2N-Relay has changed since the last transmission of the SidelinkUEInformationNR message; or
3 >
if configured by upper layers not to transmit either NR sidelink L2 U2N relay communication or NR sidelink L3 U2N relay communication, and if the last transmission of the SidelinkUEInformationNR message includes both sl-TxResourceReqL2U2N-Relay and sl-TxResourceReqL3U2N-Relay:
4 >
if the UE is capable of U2N Relay UE, and if SIB12 includes sl-RelayUE-ConfigCommon, and if the U2N Relay UE threshold conditions as specified in clause 5.8.14.2 are met; or
4 >
if the UE is selecting a U2N Relay UE / has a selected U2N Relay UE, and if SIB12 includes sl-RemoteUE-ConfigCommon, and if the U2N Remote UE threshold conditions as specified in clause 5.8.15.2 are met:
5 >
initiate transmission of the SidelinkUEInformationNR message to indicate the NR sidelink relay communication transmission resources required by the UE in accordance with clause 5.8.3.3;
2 >
else:
3 >
if the last transmission of the SidelinkUEInformationNR message included sl-TxResourceReqL2U2N-Relay or sl-TxResourceReqL3U2N-Relay:
4 >
initiate transmission of the SidelinkUEInformationNR message to indicate it no longer requires NR sidelink relay communication transmission resources in accordance with clause 5.8.3.3;
2 >
if configured by upper layers to perform NR sidelink reception on the frequency included in sl-FreqInfoList in SIB12 of the PCell and if sl-DRX-ConfigCommonGC-BC is included in SIB12-IEs:
3 >
if the UE received a sidelink DRX configuration in the RRCReconfigurationSidelink message for NR sidelink unicast reception from the associated peer UE and the UE accepted the sidelink DRX configuration:
4 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
4 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-DRX-ConfigCommonGC-BC; or
4 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-RxDRX-ReportList; or if the information carried by sl-RxDRX-ReportList has changed since the last transmission of the SidelinkUEInformationNR message:
5 >
initiate transmission of the SidelinkUEInformationNR message to report the sidelink DRX configuration in accordance with clause 5.8.3.3;
3 >
else:
4 >
if the last transmission of the SidelinkUEInformationNR message included sl-RxDRX-ReportList:
5 >
initiate transmission of the SidelinkUEInformationNR message to indicate the sidelink DRX configuration is no longer used in accordance with clause 5.8.3.3;
3 >
if the UE is performing NR sidelink groupcast or broadcast reception and is interested in a service that sidelink DRX is applied:
4 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
4 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-DRX-ConfigCommonGC-BC; or
4 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-RxInterestedGC-BC-DestList; or if the information carried by sl-RxInterestedGC-BC-DestList has changed since the last transmission of the SidelinkUEInformationNR message:
5 >
initiate transmission of the SidelinkUEInformationNR message to report the Destination Layer-2 ID and QoS profile(s) associated with the service(s) in accordance with clause 5.8.3.3;
3 >
else:
4 >
if the last transmission of the SidelinkUEInformationNR message included sl-RxInterestedGC-BC-DestList:
5 >
initiate transmission of the SidelinkUEInformationNR message to indicate it is no longer interested in the service that sidelink DRX is applied in accordance with clause 5.8.3.3;
2 >
if configured by upper layers to perform NR sidelink transmission on the frequency included in sl-FreqInfoList in SIB12 of the PCell and if sl-DRX-ConfigCommonGC-BC is included in SIB12-IEs and if the UE is configured with sl-ScheduledConfig:
3 >
if the UE received a sidelink DRX assistance information or a sidelink DRX configuration reject information from the associated peer UE for NR sidelink unicast transmission:
4 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
4 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-DRX-ConfigCommonGC-BC; or
4 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-DRX-InfoFromRxList or sl-FailureList; or if the information carried by sl-DRX-InfoFromRxList or sl-FailureList has changed since the last transmission of the SidelinkUEInformationNR message:
5 >
initiate transmission of the SidelinkUEInformationNR message to report the sidelink DRX assistance information or the sidelink DRX configuration reject information in accordance with clause 5.8.3.3;
3 >
if the UE is performing NR sidelink groupcast transmission:
4 >
if the UE did not transmit a SidelinkUEInformationNR message since last entering RRC_CONNECTED state; or
4 >
if since the last time the UE transmitted a SidelinkUEInformationNR message the UE connected to a PCell not providing SIB12 including sl-DRX-ConfigCommonGC-BC; or
4 >
if the last transmission of the SidelinkUEInformationNR message did not include sl-DRX-Indication; or if the information carried by sl-DRX-Indication has changed since the last transmission of the SidelinkUEInformationNR message:
5 >
initiate transmission of the SidelinkUEInformationNR message to report sidelink DRX on/off indication for the corresponding destination in accordance with clause 5.8.3.3;
Up

5.8.3.3  Actions related to transmission of SidelinkUEInformationNR message  p. 290

The UE shall set the contents of the SidelinkUEInformationNR message as follows:
1 >
if the UE initiates the procedure to indicate it is (no more) interested to receive NR sidelink communication; or
1 >
if the UE initiates the procedure to request (configuration/ release) of NR sidelink communication transmission resources or to report to the network that a sidelink radio link failure or sidelink RRC reconfiguration failure has been declared; or
1 >
if the UE initiates the procedure to report to the network the sidelink DRX configuration for NR sidelink unicast reception; or
1 >
if the UE initiates the procedure to report to the network the sidelink DRX assistance information or the sidelink DRX configuration reject information for NR sidelink unicast transmission; or
1 >
if the UE initiates the procedure to report to the network the Destination Layer-2 ID and QoS profile(s) associated with its interested service(s) that sidelink DRX is applied for NR sidelink groupcast or broadcast reception; or
1 >
if the UE initiates the procedure to report to the network the Destination Layer-2 ID and the sidelink DRX on/off indication for the corresponding destination for NR sidelink groupcast transmission; or
1 >
if the UE initiates the procedure to indicate it is (no more) interested to receive NR sidelink discovery messages; or
1 >
if the UE initiates the procedure to request (configuration/ release) of NR sidelink discovery messages transmission resources; or
1 >
if the UE initiates the procedure to request (configuration/ release) of NR sidelink U2N relay communication transmission resources (i.e. UE includes all concerned information, irrespective of what triggered the procedure):
2 >
if SIB12 including sl-ConfigCommonNR is provided by the PCell:
3 >
if configured by upper layers to receive NR sidelink communication:
4 >
include sl-RxInterestedFreqList and set it to the frequency for NR sidelink communication reception;
3 >
if configured by upper layers to transmit non-relay NR sidelink communication:
4 >
include sl-TxResourceReqList and set its fields (if needed) as follows for each destination for which it requests network to assign NR sidelink communication resource:
5 >
set sl-DestinationIdentity to the destination identity configured by upper layer for NR sidelink communication transmission;
5 >
set sl-CastType to the cast type of the associated destination identity configured by the upper layer for the NR sidelink communication transmission;
5 >
set sl-RLC-ModeIndication to include the RLC mode(s) and optionally QoS profile(s) of the sidelink QoS flow(s) of the associated RLC mode(s), if the associated bi-directional sidelink DRB has been established due to the configuration by RRCReconfigurationSidelink;
5 >
set sl-QoS-InfoList to include QoS profile(s) of the sidelink QoS flow(s) of the associated destination configured by the upper layer for the NR sidelink communication transmission;
5 >
set sl-InterestedFreqList to indicate the frequency of the associated destination for NR sidelink communication transmission;
5 >
set sl-TypeTxSyncList to the current synchronization reference type used on the associated sl-InterestedFreqList for NR sidelink communication transmission.
5 >
set sl-CapabilityInformationSidelink to include UECapabilityInformationSidelink message, if any, received from the associated peer UE.
4 >
if a sidelink radio link failure or a sidelink RRC reconfiguration failure has been declared, according to clauses 5.8.9.3 and 5.8.9.1.8, respectively;
5 >
include sl-FailureList and set its fields as follows for each destination for which it reports the NR sidelink communication failure:
6 >
set sl-DestinationIdentity to the destination identity configured by upper layer for NR sidelink communication transmission;
6 >
if the sidelink RLF is detected as specified in clause 5.8.9.3:
7 >
set sl-Failure as rlf for the associated destination for the NR sidelink communication transmission;
6 >
else if RRCReconfigurationFailureSidelink is received:
7 >
set sl-Failure as configFailure for the associated destination for the NR sidelink communication transmission;
3 >
if SIB12 including sl-NonRelayDiscovery and if configured by upper layers to receive NR sidelink non-relay discovery messages, or if SIB12 including sl-L2U2N-Relay and if configured by upper layers to receive NR sidelink L2 U2N relay discovery messages, or if SIB12 including sl-L3U2N-RelayDiscovery and if configured by upper layers to receive NR sidelink L3 U2N relay discovery messages:
4 >
include sl-RxInterestedFreqListDisc and set it to the frequency for NR sidelink discovery messages reception;
4 >
if the UE is capable of L2 U2N remote UE:
5 >
include sl-SourceIdentityRemoteUE and set it to the source identity configured by upper layer for NR sidelink L2 U2N relay communication transmission;
3 >
if SIB12 including sl-NonRelayDiscovery and if configured by upper layers to transmit NR sidelink non-relay discovery messages, or if SIB12 including sl-L2U2N-Relay and if configured by upper layers to transmit NR sidelink L2 U2N relay discovery messages, or if SIB12 including sl-L3U2N-RelayDiscovery and if configured by upper layers to transmit NR sidelink L3 U2N relay discovery messages:
4 >
include sl-TxResourceReqListDisc and set its fields (if needed) as follows for each destination for which it requests network to assign NR sidelink discovery messages resource:
5 >
set sl-DestinationIdentityDisc to the destination identity configured by upper layer for NR sidelink discoverymessages transmission;
5 >
if the UE is acting as L2 U2N Relay UE:
6 >
set sl-SourceIdentityRelayUE to the source identity configured by upper layer for NR sidelink L2 U2N relay discovery messages transmission;
5 >
set sl-CastTypeDisc to the cast type of the associated destination identity for the NR sidelink discovery messages transmission;
5 >
set sl-TxInterestedFreqListDisc to indicate the frequency of the associated destination for NR sidelink discovery messages transmission;
5 >
set sl-TypeTxSyncListDisc to the current synchronization reference type used on the associated sl-InterestedFreqList for NR sidelink discovery messages transmission;
5 >
set sl-DiscoveryType to the current discovery type of the associated destination identity configured by the upper layer for NR sidelink discovery messages transmission;
3 >
if SIB12 including sl-L2U2N-Relay and if configured by upper layers to transmit NR sidelink L2 U2N relay communication and the UE is acting as L2 U2N Relay UE:
4 >
include sl-TxResourceReqL2U2N-Relay in sl-TxResourceReqListCommRelay and set its fields (if needed) as follows for each destination for which it requests network to assign NR sidelink L2 U2N relay communication resource:
5 >
set sl-DestinationIdentityL2U2N to the destination identity configured by upper layer for NR sidelink L2 U2N relay communication transmission;
5 >
set sl-TxInterestedFreqListL2U2N to indicate the frequency of the associated destination for NR sidelink L2 U2N relay communication transmission;
5 >
set sl-TypeTxSyncListL2U2N to the current synchronization reference type used on the associated sl-InterestedFreqListL2U2N for NR sidelink L2 U2N relay communication transmission;
5 >
set sl-LocalID-Request to request local ID for L2 U2N Remote UE;
5 >
set sl-PagingIdentityRemoteUE to the paging UE ID received from peer L2 U2N Remote UE, if it is not released as in clause 5.8.9.8.3;
5 >
set sl-CapabilityInformationSidelink to include UECapabilityInformationSidelink message, if any, received from peer UE.
4 >
include ue-Type and set it to relayUE;
3 >
if SIB12 including sl-L2U2N-Relay and if configured by upper layers to transmit NR sidelink L2 U2N relay communication and the UE has a selected L2 U2N Relay UE:
4 >
include sl-TxResourceReqL2U2N-Relay in sl-TxResourceReqListCommRelay and set its fields (if needed) as follows to request network to assign NR sidelink L2 U2N relay communication resource:
5 >
set sl-TxInterestedFreqListL2U2N to indicate the frequency of the associated destination for NR sidelink L2 U2N relay communication transmission;
5 >
set sl-TypeTxSyncListL2U2N to the current synchronization reference type used on the associated sl-InterestedFreqListL2U2N for NR sidelink L2 U2N relay communication transmission;
5 >
set sl-CapabilityInformationSidelink to include UECapabilityInformationSidelink message, if any, received from peer UE.
4 >
include ue-Type and set it to remoteUE;
3 >
if SIB12 including sl-L3U2N-RelayDiscovery and if configured by upper layers to transmit NR sidelink L3 U2N relay communication:
4 >
include sl-TxResourceReqL3U2N-Relay in sl-TxResourceReqListCommRelay and set its fields (if needed) as follows for each destination for which it requests network to assign NR sidelink L3 U2N relay communication resource:
5 >
set sl-DestinationIdentity to the destination identity configured by upper layer for NR sidelink L3 U2N relay communication transmission;
5 >
set sl-CastType to the cast type of the associated destination identity configured by the upper layer for the NR sidelink L3 U2N relay communication transmission;
5 >
set sl-RLC-ModeIndication to include the RLC mode(s) and optionally QoS profile(s) of the sidelink QoS flow(s) of the associated RLC mode(s), if the associated bi-directional sidelink DRB has been established due to the configuration by RRCReconfigurationSidelink;
5 >
set sl-QoS-InfoList to include QoS profile(s) of the sidelink QoS flow(s) of the associated destination configured by the upper layer for the NR sidelink L3 U2N relay communication transmission;
5 >
set sl-TxInterestedFreqList to indicate the frequency of the associated destination for NR sidelink L3 U2N relay communication transmission;
5 >
set sl-TypeTxSyncList to the current synchronization reference type used on the associated sl-InterestedFreqList for NR sidelink L3 U2N relay communication transmission.
5 >
set sl-CapabilityInformationSidelink to include UECapabilityInformationSidelink message, if any, received from peer UE.
4 >
include ue-Type and set it to relayUE if the UE is acting as NR sidelink L3 U2N Relay UE or to remoteUE otherwise;
3 >
if sl-DRX-ConfigCommonGC-BC is included in SIB12-IEs:
4 >
if configured by upper layers to perform NR sidelink reception:
5 >
include sl-RxDRX-ReportList and set its fields (if needed) as follows for each destination for which it reports to network:
6 >
set sl-DRX-ConfigFromTx to include the accepted sidelink DRX configuration of the associated destination for NR sidelink unicast communication, if received from the associated peer UE;
5 >
include sl-RxInterestedGC-BC-DestList and set its fields (if needed) as follows for each Destination Layer-2 ID for which it reports to network:
6 >
set sl-RxInterestedQoS-InfoList to include the QoS profile of its interested service(s) that sidelink DRX is applied for the associated destination for NR sidelink groupcast or broadcast reception;
6 >
set sl-DestinationIdentity to the associated destination identity configured by upper layer for NR sidelink groupcast or broadcast reception;
4 >
if configured by upper layers to perform NR sidelink transmission and configured with sl-ScheduledConfig:
5 >
include sl-TxResourceReqList and/or sl-TxResourceReqListCommRelay and set its fields (if needed) as follows for each destination for which it reports to network:
6 >
set sl-DRX-InfoFromRxList to include the sidelink DRX assistance information of the associated destination, if any, received from the associated peer UE;
6 >
if the RRCReconfigurationCompleteSidelink message includes the sl-DRX-ConfigReject:
7 >
set sl-Failure as drxReject-v1710 for the associated destination for the NR sidelink communication transmission;
6 >
set sl-DRX-Indication to include the sidelink DRX on/off indication for the associated destination for NR sidelink groupcast transmission;
1 >
if the UE initiates the procedure while connected to an E-UTRA PCell:
2 >
submit the SidelinkUEInformationNR to lower layers via SRB1, embedded in E-UTRA RRC message ULInformationTransferIRAT as specified in clause 5.6.28 of TS 36.331;
1 >
else:
2 >
submit the SidelinkUEInformationNR message to lower layers for transmission.
Up

5.8.4  Void

5.8.5  Sidelink synchronisation information transmission for NR sidelink communication/discovery  p. 294

5.8.5.1  General  p. 294

Reproduction of 3GPP TS 38.331, Fig. 5.8.5.1-1: Synchronisation information transmission for NR sidelink communication/discovery, in (partial) coverage
Figure 5.8.5.1-1: Synchronisation information transmission for NR sidelink communication/discovery, in (partial) coverage
Up
Reproduction of 3GPP TS 38.331, Fig. 5.8.5.1-2: Synchronisation information transmission for NR sidelink communication/discovery, out of coverage
Figure 5.8.5.1-2: Synchronisation information transmission for NR sidelink communication/discovery, out of coverage
Up
The purpose of this procedure is to provide synchronisation information to a UE. This procedure also applies to NR sidelink discovery.

5.8.5.2  Initiation  p. 295

A UE capable of NR sidelink communication/discovery and SLSS/PSBCH transmission shall, when transmitting NR sidelink communication/discovery, and if the conditions for NR sidelink communication/discovery operation are met and when the following conditions are met:
1 >
if in coverage on the frequency used for NR sidelink communication/discovery, as defined in TS 38.304; and has selected GNSS or the cell as synchronization reference as defined in clause 5.8.6.3; or
1 >
if out of coverage on the frequency used for NR sidelink communication/discovery, and the frequency used to transmit NR sidelink communication/discovery is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-FreqInfoList within SIB12; and has selected GNSS or the cell as synchronization reference as defined in clause 5.8.6.3:
2 >
if in RRC_CONNECTED; and if networkControlledSyncTx is configured and set to on; or
2 >
if networkControlledSyncTx is not configured; and for the concerned frequency syncTxThreshIC is configured; and the RSRP measurement of the reference cell, selected as defined in clause 5.8.6.3, for NR sidelink communication/discovery transmission is below the value of syncTxThreshIC:
3 >
transmit sidelink SSB on the frequency used for NR sidelink communication/discovery in accordance with clause 5.8.5.3 and TS 38.211, including the transmission of SLSS as specified in clause 5.8.5.3 and transmission of MasterInformationBlockSidelink as specified in clause 5.8.9.4.3;
1 >
else:
2 >
for the frequency used for NR sidelink communication/discovery, if syncTxThreshOoC is included in SidelinkPreconfigNR; and the UE is not directly synchronized to GNSS, and the UE has no selected SyncRef UE or the PSBCH-RSRP measurement result of the selected SyncRef UE is below the value of syncTxThreshOoC; or
2 >
for the frequency used for NR sidelink communication/discovery, if the UE selects GNSS as the synchronization reference source:
3 >
transmit sidelink SSB on the frequency used for NR sidelink communication/discovery in accordance with TS 38.211 , including the transmission of SLSS as specified in clause 5.8.5.3 and transmission of MasterInformationBlockSidelink as specified in clause 5.8.9.4.3;
Up

5.8.5.3  Transmission of SLSS  p. 295

The UE shall select the SLSSID and the slot in which to transmit SLSS as follows:
1 >
if triggered by NR sidelink communication/discovery and in coverage on the frequency used for NR sidelink communication/discovery, as defined in TS 38.304; or
1 >
if triggered by NR sidelink communication/discovery, and out of coverage on the frequency used for NR sidelink communication/discovery, and the concerned frequency is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-FreqInfoList within SIB12:
2 >
if the UE has selected GNSS as synchronization reference in accordance with clause 5.8.6.2:
3 >
select SLSSID 0;
3 >
use sl-SSB-TimeAllocation1 included in the entry of configured sl-SyncConfigList corresponding to the concerned frequency, that includes txParameters and gnss-Sync;
3 >
select the slot(s) indicated by sl-SSB-TimeAllocation1;
2 >
if the UE has selected a cell as synchronization reference in accordance with clause 5.8.6.2:
3 >
select the SLSSID included in the entry of configured sl-SyncConfigList corresponding to the concerned frequency, that includes txParameters and does not include gnss-Sync;
3 >
select the slot(s) indicated by sl-SSB-TimeAllocation1;
1 >
else if triggered by NR sidelink communication/discovery and the UE has GNSS as the synchronization reference:
2 >
select SLSSID 0;
2 >
if sl-SSB-TimeAllocation3 is configured for the frequency used in SidelinkPreconfigNR:
3 >
select the slot(s) indicated by sl-SSB-TimeAllocation3;
2 >
else:
3 >
select the slot(s) indicated by sl-SSB-TimeAllocation1;
1 >
else:
2 >
select the synchronisation reference UE (i.e. SyncRef UE) as defined in clause 5.8.6;
2 >
if the UE has a selected SyncRef UE and inCoverage in the MasterInformationBlockSidelink message received from this UE is set to true; or
2 >
if the UE has a selected SyncRef UE and inCoverage in the MasterInformationBlockSidelink message received from this UE is set to false while the SLSS from this UE is part of the set defined for out of coverage, see TS 38.211:
3 >
select the same SLSSID as the SLSSID of the selected SyncRef UE;
3 >
select the slot in which to transmit the SLSS according to the sl-SSB-TimeAllocation1 or sl-SSB-TimeAllocation2 included in the preconfigured sidelink parameters corresponding to the concerned frequency, such that the timing is different from the SLSS of the selected SyncRef UE;
2 >
else if the UE has a selected SyncRef UE and the SLSS from this UE was transmitted on the slot(s) indicated sl-SSB-TimeAllocation3, which is configured for the frequency used in SidelinkPreconfigNR:
3 >
select SLSSID 337;
3 >
select the slot(s) indicated by sl-SSB-TimeAllocation2;
2 >
else if the UE has a selected SyncRef UE:
3 >
select the SLSSID from the set defined for out of coverage having an index that is 336 more than the index of the SLSSID of the selected SyncRef UE, see TS 38.211;
3 >
select the slot in which to transmit the SLSS according to sl-SSB-TimeAllocation1 or sl-SSB-TimeAllocation2 included in the preconfigured sidelink parameters corresponding to the concerned frequency, such that the timing is different from the SLSS of the selected SyncRef UE;
2 >
else (i.e. no SyncRef UE selected):
3 >
if the UE has not randomly selected an SLSSID:
4 >
randomly select, using a uniform distribution, an SLSSID from the set of sequences defined for out of coverage except SLSSID 336 and 337, see TS 38.211;
4 >
select the slot in which to transmit the SLSS according to the sl-SSB-TimeAllocation1 or sl-SSB-TimeAllocation2 (arbitrary selection between these) included in the preconfigured sidelink parameters in SidelinkPreconfigNR corresponding to the concerned frequency;
Up

5.8.5a  Sidelink synchronisation information transmission for V2X sidelink communication  p. 297

5.8.5a.1  General  p. 297

Reproduction of 3GPP TS 38.331, Fig. 5.8.5a.1-1: Synchronisation information transmission for V2X sidelink communication, in (partial) coverage
Figure 5.8.5a.1-1: Synchronisation information transmission for V2X sidelink communication, in (partial) coverage
Up
Reproduction of 3GPP TS 38.331, Fig. 5.8.5a.1-2: Synchronisation information transmission for V2X sidelink communication, out of coverage
Figure 5.8.5a.1-2: Synchronisation information transmission for V2X sidelink communication, out of coverage
Up
The purpose of this procedure is to provide synchronisation information to a UE.

5.8.5a.2  Initiation  p. 297

A UE capable of V2X sidelink communication initiates the transmission of SLSS and MasterInformationBlock-SL-V2X according to the conditions and the procedures specified for V2X sidelink communication in clause 5.10.7 of TS 36.331.

5.8.6  Sidelink synchronisation reference  p. 297

5.8.6.1  General  p. 297

The purpose of this procedure is to select a synchronisation reference and used when transmitting NR sidelink communication/discovery. This procedure also applies to NR sidelink discovery.

5.8.6.2  Selection and reselection of synchronisation reference  p. 297

The UE shall:
1 >
if the frequency used for NR sidelink communication/discovery is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-ConfigCommonNR within SIB12, and sl-SyncPriority is configured for the concerned frequency and set to gnbEnb:
2 >
select a cell as the synchronization reference source as defined in clause 5.8.6.3:
1 >
else if the frequency used for NR sidelink communication/discovery is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-ConfigCommonNR within SIB12, and sl-SyncPriority for the concerned frequency is not configured or is set to gnss, and GNSS is reliable in accordance with TS 38.101-1 and TS 38.133:
2 >
select GNSS as the synchronization reference source;
1 >
else if the frequency used for NR sidelink communication/discovery is included in SL-PreconfigurationNR, and sl-SyncPriority in SidelinkPreconfigNR is set to gnss and GNSS is reliable in accordance with TS 38.101-1 and TS 38.133:
2 >
select GNSS as the synchronization reference source;
1 >
else:
2 >
perform a full search (i.e. covering all subframes and all possible SLSSIDs) to detect candidate SLSS, in accordance with TS 38.133
2 >
when evaluating the one or more detected SLSSIDs, apply layer 3 filtering as specified in clause 5.5.3.2 using the preconfigured sl-filterCoefficient, before using the PSBCH-RSRP measurement results;
2 >
if the UE has selected a SyncRef UE:
3 >
if the PSBCH-RSRP of the strongest candidate SyncRef UE exceeds the minimum requirement TS 38.133 by sl-SyncRefMinHyst and the strongest candidate SyncRef UE belongs to the same priority group as the current SyncRef UE and the PSBCH-RSRP of the strongest candidate SyncRef UE exceeds the PSBCH-RSRP of the current SyncRef UE by syncRefDiffHyst; or
3 >
if the PSBCH-RSRP of the candidate SyncRef UE exceeds the minimum requirement TS 38.133 by sl-SyncRefMinHyst and the candidate SyncRef UE belongs to a higher priority group than the current SyncRef UE; or
3 >
if GNSS becomes reliable in accordance with TS 38.101-1 and TS 38.133, and GNSS belongs to a higher priority group than the current SyncRef UE; or
3 >
if a cell is detected and gNB/eNB (if sl-NbAsSync is set to true) belongs to a higher priority group than the current SyncRef UE; or
3 >
if the PSBCH-RSRP of the current SyncRef UE is less than the minimum requirement defined in TS 38.133:
4 >
consider no SyncRef UE to be selected;
2 >
if the UE has selected GNSS as the synchronization reference for NR sidelink communication/discovery:
3 >
if the PSBCH-RSRP of the candidate SyncRef UE exceeds the minimum requirement defined in TS 38.133 by sl-SyncRefMinHyst and the candidate SyncRef UE belongs to a higher priority group than GNSS; or
3 >
if GNSS becomes not reliable in accordance with TS 38.101-1 and TS 38.133:
4 >
consider GNSS not to be selected;
2 >
if the UE has selected cell as the synchronization reference for NR sidelink communication/discovery:
3 >
if the PSBCH-RSRP of the candidate SyncRef UE exceeds the minimum requirement defined in TS 38.133 by sl-SyncRefMinHyst and the candidate SyncRef UE belongs to a higher priority group than gNB/eNB; or
3 >
if the selected cell is not detected:
4 >
consider the cell not to be selected;
2 >
if the UE has not selected any synchronization reference:
3 >
if the UE detects one or more SLSSIDs for which the PSBCH-RSRP exceeds the minimum requirement defined in TS 38.133 by sl-SyncRefMinHyst and for which the UE received the corresponding MasterInformationBlockSidelink message (candidate SyncRef UEs), or if the UE detects GNSS that is reliable in accordance with TS 38.101-1 and TS 38.133, or if the UE detects a cell, select a synchronization reference according to the following priority group order:
4 >
if sl-SyncPriority corresponding to the concerned frequency is set to gnbEnb:
5 >
UEs of which SLSSID is part of the set defined for in coverage, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to true, starting with the UE with the highest PSBCH-RSRP result (priority group 1);
5 >
UE of which SLSSID is part of the set defined for in coverage, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 2);
5 >
GNSS that is reliable in accordance with TS 38.101-1 and TS 38.133 (priority group 3);
5 >
UEs of which SLSSID is 0, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to true, or of which SLSSID is 0 and SLSS is transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, starting with the UE with the highest PSBCH-RSRP result (priority group 4);
5 >
UEs of which SLSSID is 0 and SLSS is not transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 5);
5 >
UEs of which SLSSID is 337 and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 5);
5 >
Other UEs, starting with the UE with the highest PSBCH-RSRP result (priority group 6);
4 >
if sl-SyncPriority corresponding to the concerned frequency is set to gnss, and sl-NbAsSync is set to true:
5 >
UEs of which SLSSID is 0, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to true, or of which SLSSID is 0 and SLSS is transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, starting with the UE with the highest PSBCH-RSRP result (priority group 1);
5 >
UEs of which SLSSID is 0 and SLSS is not transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCHS-RSRP result (priority group 2);
5 >
UEs of which SLSSID is 337 and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 2);
5 >
the cell detected by the UE as defined in clause 5.8.6.3 (priority group 3);
5 >
UEs of which SLSSID is part of the set defined for in coverage, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to true, starting with the UE with the highest PSBCH-RSRP result (priority group 4);
5 >
UE of which SLSSID is part of the set defined for in coverage, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 5);
5 >
Other UEs, starting with the UE with the highest S-RSRP result (priority group 6);
4 >
if sl-SyncPriority corresponding to the concerned frequency is set to gnss, and sl-NbAsSync is set to false:
5 >
UEs of which SLSSID is 0, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to true, or of which SLSSID is 0 and SLSS is transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, starting with the UE with the highest PSBCH-RSRP result (priority group 1);
5 >
UEs of which SLSSID is 0 and SLSS is not transmitted on slot(s) indicated by sl-SSB-TimeAllocation3, and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCHS-RSRP result (priority group 2);
5 >
UEs of which SLSSID is 337 and inCoverage, included in the MasterInformationBlockSidelink message received from this UE, is set to false, starting with the UE with the highest PSBCH-RSRP result (priority group 2);
5 >
Other UEs, starting with the UE with the highest PSBCH-RSRP result (priority group 3);
Up

5.8.6.3  Sidelink communication transmission reference cell selection  p. 300

A UE capable of NR sidelink communication/discovery that is configured by upper layers to transmit NR sidelink communication/discovery shall:
1 >
for the frequency used to transmit NR sidelink communication/discovery, select a cell to be used as reference for synchronization in accordance with the following:
2 >
if the frequency concerns the primary frequency:
3 >
use the PCell or the serving cell as reference;
2 >
else if the frequency concerns a secondary frequency:
3 >
use the concerned SCell as reference;
2 >
else if the UE is in coverage of the concerned frequency:
3 >
use the DL frequency paired with the one used to transmit NR sidelink communication/discovery as reference;
2 >
else (i.e., out of coverage on the concerned frequency):
3 >
use the PCell or the serving cell as reference, if needed;
Up

5.8.7  Sidelink communication reception  p. 300

A UE capable of NR sidelink communication that is configured by upper layers to receive NR sidelink communication shall:
1 >
if the conditions for NR sidelink communication operation as defined in clause 5.8.2 are met:
2 >
if the frequency used for NR sidelink communication is included in sl-FreqInfoToAddModList in RRCReconfiguration message or sl-FreqInfoList included in SIB12:
3 >
if the UE is configured with sl-RxPool included in RRCReconfiguration message with reconfigurationWithSync (i.e. handover):
4 >
configure lower layers to monitor sidelink control information and the corresponding data using the pool(s) of resources indicated by sl-RxPool;
3 >
else if the cell chosen for NR sidelink communication provides SIB12:
4 >
configure lower layers to monitor sidelink control information and the corresponding data using the pool(s) of resources indicated by sl-RxPool in SIB12;
2 >
else:
3 >
configure lower layers to monitor sidelink control information and the corresponding data using the pool(s) of resources that were preconfigured by sl-RxPool in SL-PreconfigurationNR, as defined in clause 9.3.
Up

5.8.8  Sidelink communication transmission  p. 301

A UE capable of NR sidelink communication that is configured by upper layers to transmit NR sidelink communication and has related data to be transmitted shall:
1 >
if the conditions for NR sidelink communication operation as defined in clause 5.8.2 are met:
2 >
if the frequency used for NR sidelink communication is included in sl-FreqInfoToAddModList in sl-ConfigDedicatedNR within RRCReconfiguration message or included in sl-ConfigCommonNR within SIB12:
3 >
if the UE is in RRC_CONNECTED and uses the frequency included in sl-ConfigDedicatedNR within RRCReconfiguration message:
4 >
if the UE is configured with sl-ScheduledConfig:
5 >
if T310 for MCG or T311 is running; and if sl-TxPoolExceptional is included in sl-FreqInfoList for the concerned frequency in SIB12 or included in sl-ConfigDedicatedNR in RRCReconfiguration; or
5 >
if T301 is running and the cell on which the UE initiated RRC connection re-establishment provides SIB12 including sl-TxPoolExceptional for the concerned frequency; or
5 >
if T304 for MCG is running and the UE is configured with sl-TxPoolExceptional included in sl-ConfigDedicatedNR for the concerned frequency in RRCReconfiguration:
6 >
configure lower layers to perform the sidelink resource allocation mode 2 based on random selection using the pool of resources indicated by sl-TxPoolExceptional as defined in TS 38.321;
5 >
else:
6 >
configure lower layers to perform the sidelink resource allocation mode 1 for NR sidelink communication;
5 >
if T311 is running, configure the lower layers to release the resources indicated by rrc-ConfiguredSidelinkGrant (if any);
4 >
if the UE is configured with sl-UE-SelectedConfig:
5 >
if a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for the concerned frequency included in sl-ConfigDedicatedNR within RRCReconfiguration is not available in accordance with TS 38.214;
6 >
if sl-TxPoolExceptional for the concerned frequency is included in RRCReconfiguration; or
6 >
if the PCell provides SIB12 including sl-TxPoolExceptional in sl-FreqInfoList for the concerned frequency:
7 >
configure lower layers to perform the sidelink resource allocation mode 2 based on random selection using the pool of resources indicated by sl-TxPoolExceptional as defined in TS 38.321;
5 >
else, if the sl-TxPoolSelectedNormal for the concerned frequency is included in the sl-ConfigDedicatedNR within RRCReconfiguration:
6 >
configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-TxPoolSelectedNormal for the concerned frequency;
3 >
else:
4 >
if the cell chosen for NR sidelink communication transmission provides SIB12:
5 >
if SIB12 includes sl-TxPoolSelectedNormal for the concerned frequency, and a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in the sl-TxPoolSelectedNormal is available in accordance with TS 38.214 or random selection, if allowed by sl-AllowedResourceSelectionConfig, is selected:
6 >
configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig using the pools of resources indicated by sl-TxPoolSelectedNormal for the concerned frequency as defined in TS 38.321;
5 >
else if SIB12 includes sl-TxPoolExceptional for the concerned frequency:
6 >
from the moment the UE initiates RRC connection establishment or RRC connection resume, until receiving an RRCReconfiguration including sl-ConfigDedicatedNR, or receiving an RRCRelease or an RRCReject; or
6 >
if a result of full/partial sensing, if selected and is allowed by sl-AllowedResourceSelectionConfig, on the resources configured in sl-TxPoolSelectedNormal for the concerned frequency in SIB12 is not available in accordance with TS 38.214:
7 >
configure lower layers to perform the sidelink resource allocation mode 2 based on random selection (as defined in TS 38.321) using the pool of resources indicated by sl-TxPoolExceptional for the concerned frequency;
2 >
else:
3 >
configure lower layers to perform the sidelink resource allocation mode 2 based on resource selection operation according to sl-AllowedResourceSelectionConfig (as defined in TS 38.321 and TS 38.214) using the pools of resources indicated by sl-TxPoolSelectedNormal in SidelinkPreconfigNR for the concerned frequency.
If configured to perform sidelink resource allocation mode 2, the UE capable of NR sidelink communication that is configured by upper layers to transmit NR sidelink communication shall perform resource selection operation according to sl-AllowedResourceSelectionConfig on all pools of resources which may be used for transmission of the sidelink control information and the corresponding data. The pools of resources are indicated by SidelinkPreconfigNR, sl-TxPoolSelectedNormal in sl-ConfigDedicatedNR, or sl-TxPoolSelectedNormal in SIB12 for the concerned frequency, as configured above.
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