Section: 5.8.9.1 Sidelink RRC reconfiguration 5.8.9.1.1 General
Content: Figure 5.8.9.1.1-1: Sidelink RRC reconfiguration, successful Figure 5.8.9.1.1-2: Sidelink RRC reconfiguration, failure The purpose of this procedure is to modify a PC5-RRC connection, e.g. to establish/modify/release sidelink DRBs or additional sidelink RLC bearer or PC5 Relay RLC channels, to add/modify/release sidelink carrier, to (re-)configure NR sidelink measurement and reporting, to (re-)configure sidelink CSI reference signal resources, to (re)configure CSI reporting latency bound, to (re)configure sidelink DRX, to (re-)configure the latency bound of SL Inter-UE coordination report, and to indicate the SFN-DFN offset. The UE may initiate the sidelink RRC reconfiguration procedure and perform the operation in clause 5.8.9.1.2 on the corresponding PC5-RRC connection in following cases: - the release of sidelink DRBs associated with the peer UE, or L2 U2U Relay UE and peer L2 U2U Remote UE in case of L2 U2U Relay operation, as specified in clause 5.8.9.1a.1; - the establishment of sidelink DRBs associated with the peer UE, or L2 U2U Relay UE and peer L2 U2U Remote UE in case of L2 U2U Relay operation, as specified in clause 5.8.9.1a.2; - the modification for the parameters included in SLRB-Config of sidelink DRBs associated with the peer UE, as specified in clause 5.8.9.1a.2; - the release of additional sidelink RLC bearer associated with the peer UE, as specified in clause 5.8.9.1a.5; - the establishment of additional sidelink RLC bearer associated with the peer UE, as specified in clause 5.8.9.1a.6; - the modification for the parameters included in SL-RLC-BearerConfig of additional sidelink RLC bearer associated with the peer UE, as specified in clause 5.8.9.1a.6; - the release of PC5 Relay RLC channels for L2 U2N/U2U Relay UE and Remote UE, as specified in clause 5.8.9.7.1; - the establishment of PC5 Relay RLC channels for L2 U2N/U2U Relay UE and Remote UE, as specified in clause 5.8.9.7.2; - the modification for the parameters included in SL-RLC-ChannelConfigPC5 of PC5 Relay RLC channels for L2 U2N/U2U Relay UE and Remote UE, as specified in clause 5.8.9.7.2; - the release of sidelink carrier associated with the peer UE, as specified in clause 5.8.9.1b.1; - the addition of sidelink carrier associated with the peer UE, as specified in clause 5.8.9.1b.2; - the modification of sidelink carrier associated with the peer UE, as specified in clause 5.8.9.1b.2; - the (re-)configuration of the peer UE to perform NR sidelink measurement and report. - the (re-)configuration of the sidelink CSI reference signal resources and CSI reporting latency bound; - the (re-)configuration of the peer UE to perform sidelink DRX; - the (re-)configuration of the latency bound of SL Inter-UE coordination report; - the (re-)configuration of the local UE ID for L2 U2U Remote UEs by L2 U2U Relay UE. - the response to the request in a RemoteUEInformationSidelink message for the SFN-DFN offset from the L2 U2N Remote UE; - the change in the value of the SFN-DFN offset at the L2 U2N Relay UE. NOTE: It is up to L2 U2N Relay UE implementation to determine when the SFN-DFN offset has changed in value to a degree requiring an update to be sent to the L2 U2N Remote UE. In RRC_CONNECTED, the UE applies the NR sidelink communications parameters provided in RRCReconfiguration (if any). In RRC_IDLE or RRC_INACTIVE, the UE applies the NR sidelink communications parameters provided in system information (if any). For other cases, UEs apply the NR sidelink communications parameters provided in SidelinkPreconfigNR (if any). When UE performs state transition between above three cases, the UE applies the NR sidelink communications parameters provided in the new state, after acquisition of the new configurations. Before acquisition of the new configurations, UE continues applying the NR sidelink communications parameters provided in the old state.