Section: 16.9.2.6 RRC
Content: The RRC sublayer provides the following services and functions over the PC5 interface: - Transfer of a PC5-RRC message between peer UEs; - Maintenance and release of a PC5-RRC connection between two UEs; - Detection of sidelink radio link failure for a PC5-RRC connection; - Measurement configuration and reporting related to sidelink. A PC5-RRC connection is a logical connection between two UEs for a pair of Source and Destination Layer-2 IDs which is considered to be established after a corresponding PC5 unicast link is established as specified in TS 23.287[ Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services ]  [40]. There is one-to-one correspondence between the PC5-RRC connection and the PC5 unicast link. A UE may have multiple PC5-RRC connections with one or more UEs for different pairs of Source and Destination Layer-2 IDs. Separate PC5-RRC procedures and messages are used for a UE to transfer UE capability and sidelink configuration to the peer UE, as specified in TS 38.331[ NR; Radio Resource Control (RRC); Protocol specification ]  [3]. Both peer UEs can exchange their own UE capability and sidelink configuration using separate bi-directional procedures in both sidelink directions. If it is not interested in sidelink transmission, if sidelink RLF on the PC5-RRC connection is declared, or if the Layer-2 link release procedure is completed as specified in TS 23.287[ Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services ]  [40], UE releases the PC5-RRC connection.