Section: 5.8.17.3 Conditions for Selection and reselection of NR sidelink U2U Relay UE
Content: A UE capable of NR sidelink U2U Remote UE operation shall initiate NR sidelink U2U Relay (re)slection procedure as specified in 5.8.17.4 when one of the following conditions is met: 1> if configured by upper layers to search for or select a NR sidelink U2U Relay UE; or 1> if the NR sidelink U2U Remote UE threshold conditions for direct PC5 link with the peer NR sidelink U2U Remote UE as specified in 5.8.17.2 are met within sl-RemoteUE-ConfigU2U if configured: 2> if the UE does not have a selected NR sidelink U2U Relay UE; or 2> if the UE has a selected NR sidelink U2U Relay UE, and SL-RSRP of the currently selected NR sidelink U2U Relay UE is available and is below sl-RSRP-ThreshU2U by sl-HystMinU2U within sl-RemoteUE-ConfigU2U if configured; or 2> if the UE has a selected NR sidelink U2U Relay UE, and SD-RSRP of the currently selected NR sidelink U2U Relay UE is available, and is below sd-RSRP-ThreshU2U by sd-HystMinU2U within sl-RemoteUE-ConfigU2U if configured; or NOTE: For relay selection, U2U Remote UE uses SL-RSRP measurements for relay selection trigger evaluation when there is data transmission from peer U2U Remote UE to U2U Remote UE. For relay reselection, U2U Remote UE uses SL-RSRP measurements for relay reselection trigger evaluation when there is data transmission from U2U Relay UE to U2U Remote UE. And in both cases, it is left to UE implementation whether to use SL-RSRP or SD-RSRP for relay (re)selection trigger evaluation in case of no data transmission. 2> if the UE has a selected NR sidelink U2U Relay UE, and upper layers indicate not to use the currently selected NR sidelink U2U Relay UE; or 2> if the UE has a selected NR sidelink U2U Relay UE, and upper layers request the release of the PC5-RRC connection with the current NR sidelink U2U Relay UE; or 2> if the UE has a selected NR sidelink U2U Relay UE, and sidelink radio link failure is detected on the PC5-RRC connection with the current NR sidelink U2U Relay UE as specified in clause 5.8.9.3: