Section: 5.3.3.1a Conditions for establishing RRC Connection for NR sidelink communication/discovery/V2X sidelink communication
Content: For NR sidelink communication/discovery, an RRC connection establishment is initiated only in the following cases: 1> if configured by upper layers to transmit NR sidelink communication and related data is available for transmission: 2> if the frequency on which the UE is configured to transmit NR sidelink communication is included in sl-FreqInfoList/sl-FreqInfoListSizeExt within SIB12 provided by the cell on which the UE camps; and if the valid version of SIB12 does not include sl-TxPoolSelectedNormal for the concerned frequency; 1> if configured by upper layers to transmit NR sidelink discovery and related data is available for transmission: 2> if the UE is configured by upper layers to transmit NR sidelink L2 U2N relay discovery messages and sl-L2U2N-Relay is included in SIB12; or 2> if the UE is configured by upper layers to transmit NR sidelink L3 U2N relay discovery messages and sl-L3U2N-RelayDiscovery is included in SIB12; or 2> if the UE is configured by upper layers to transmit NR sidelink non-relay discovery messages and sl-NonRelayDiscovery is included in SIB12: 3> if the frequency on which the UE is configured to transmit NR sidelink discovery is included in sl-FreqInfoList/sl-FreqInfoListSizeExt within SIB12 provided by the cell on which the UE camps; and if the valid version of SIB12 includes neither sl-DiscTxPoolSelected nor sl-TxPoolSelectedNormal for the concerned frequency; For L2 U2N Relay UE in RRC_IDLE, an RRC connection establishment is initiated in the following cases: 1> if any message is received from a L2 U2N Remote UE via SL-RLC0 as specified in 9.1.1.4 or SL-RLC1 as specified in 9.2.4; or 1> if RemoteUEInformationSidelink containing the connectionForMP is received from a L2 U2N Remote UE as specified in 5.8.9.8.3; For V2X sidelink communication, an RRC connection is initiated only when the conditions specified for V2X sidelink communication in clause 5.3.3.1a of TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [10] are met. NOTE: Upper layers initiate an RRC connection (except if the RRC connection is initiated at the L2 U2N Relay UE upon reception of a message from a L2 U2N Remote UE via SL-RLC0 or SL-RLC1). The interaction with NAS is left to UE implementation.