16.9.4.3 Control of idle/inactive UEs

The UE in RRC_IDLE or RRC_INACTIVE performs NR sidelink communication and/or V2X sidelink communication, as configured by the upper layers. NG-RAN may provide common sidelink configuration to the UE in RRC_IDLE or RRC_INACTIVE via system information for NR sidelink communication and/or V2X sidelink communication. UE receives resource pool configuration and SL DRB configuration via SIB12 for NR sidelink communication as specified in TS 38.331 [12], and/or resource pool configuration via SIB13 and SIB14 for V2X sidelink communication as specified in TS 38.331 [12].

When the UE performs cell reselection, the UE interested in V2X service(s) considers at least whether NR sidelink communication and/or V2X sidelink communication are supported by the cell. The UE may consider the following carrier frequency as the highest priority frequency, except for the carrier only providing the anchor carrier:

• the frequency providing both NR sidelink communication configuration and V2X sidelink communication configuration, if configured to perform both NR sidelink communication and V2X sidelink communication;
• the frequency providing NR sidelink communication configuration, if configured to perform only NR sidelink communication.
• the frequency providing V2X sidelink communication configuration, if configured to perform only V2X sidelink communication.

When the UE performs cell reselection, the UE interested in ProSe service(s) considers at least whether NR sidelink communication/discovery is supported by the cell. The UE may consider the carrier frequency providing NR sidelink communication/discovery configuration as the highest priority frequency, except for the carrier only providing the anchor carrier.