Section: 5.8.17.4 Actions related to selection and reselection of NR sidelink U2U Relay UE
Content: A UE capable of NR sidelink U2U Remote UE operation shall: 1> perform NR sidelink discovery procedure as specified in clause 5.8.13 in order to search for candidate NR sidelink U2U Relay UEs; 2> when evaluating the one or more detected NR sidelink U2U Relay UEs, apply layer 3 filtering as specified in 5.5.3.2 across measurements that concern the same U2U Relay UE ID and using the sd-FilterCoefficientU2U in SIB12 (if in RRC_IDLE/INACTIVE), the sd-FilterCoefficientU2U in sl-ConfigDedicatedNR (if in RRC_CONNECTED) or the preconfigured sd-FilterCoefficientU2U as defined in 9.3 (out of coverage), before using the SD-RSRP measurement results; 2> consider a candidate NR sidelink U2U Relay UE for which SD-RSRP exceeds sd-RSRP-ThreshU2U has met the AS criteria; 1> if the UE detects any suitable NR sidelink U2U Relay UE(s): 2> consider one of the available suitable NR sidelink U2U Relay UE(s) can be selected; 1> else: 2> consider no NR sidelink U2U Relay UE to be selected; 1> if the UE is performing U2U Relay Communication with integrated Discovery as specified in TS 23.304[ Proximity based Services (ProSe) in the 5G System (5GS) ]  [65] and has received Direct Communication Request message(s) from one or multiple NR sidelink U2U Relay UEs: 2> when evaluating the NR sidelink U2U Relay UE(s), apply layer 3 filtering as specified in 5.5.3.2 across measurements that concern the same U2U Relay UE ID and using the sd-FilterCoefficientU2U in SIB12 (if in RRC_IDLE/INACTIVE), the sd-FilterCoefficientU2U in sl-ConfigDedicatedNR (if in RRC_CONNECTED) or the preconfigured sd-FilterCoefficientU2U as defined in 9.3 (out of coverage), before using the SD-RSRP measurement results; 2> consider a candidate NR sidelink U2U Relay UE for which SL-RSRP exceeds sd-RSRP-ThreshU2U has met the AS criteria; 2> if the UE detects any suitable NR sidelink U2U Relay UE(s): 3> consider one of the available suitable NR sidelink U2U Relay UE(s) can be selected; 2> else: 3> consider no NR sidelink U2U Relay UE to be selected. NOTE: A candidate NR sidelink U2U Relay UE which meets all AS layer criteria defined in 5.8.17.4 and higher layer criteria defined in TS 23.304[ Proximity based Services (ProSe) in the 5G System (5GS) ]  [65] can be regarded as suitable NR sidelink U2U Relay UE by the NR sidelink U2U Remote UE. If multiple suitable NR sidelink U2U Relay UEs are available, it is up to Remote UE implementation to choose one NR sidelink U2U Relay UE. The details of the interaction with upper layers are up to UE implementation.