Section: 9.1.1.4 SCCH configuration
Content: Parameters that are specified for unicast of NR sidelink communication, which is used for the sidelink signalling radio bearer of PC5-RRC message. The SL-SRB using this SCCH configuration is named as SL-SRB3. Parameters that are specified of NR sidelink communication, which is used for the sidelink signalling radio bearer of unprotected PC5-S message (e.g. Direct Link Establishment Request, TS 24.587[ Vehicle-to-Everything (V2X) services in 5G System (5GS); Stage 3 ]  [57] or Prose Direct Link Establishment Request, TS 24.554[ Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3 ]  [72]). The SL-SRB using this SCCH configuration is named as SL-SRB0. Parameters that are specified for unicast of NR sidelink communication, which is used for the sidelink signalling radio bearer of PC5-S message establishing PC5-S security (e.g. Direct Link Security Mode Command and Direct Link Security Mode Complete, TS 24.587[ Vehicle-to-Everything (V2X) services in 5G System (5GS); Stage 3 ]  [57] or ProSe Direct Link Security Mode Command and ProSe Direct Link Security Mode Complete, TS 24.554[ Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3 ]  [72]). The SL-SRB using this SCCH configuration is named as SL-SRB1. Parameters that are specified for unicast of NR sidelink communication, which is used for the sidelink signalling radio bearer of protected PC5-S message except Direct Link Security Mode Complete, TS 24.587[ Vehicle-to-Everything (V2X) services in 5G System (5GS); Stage 3 ]  [57] or Prose Direct Link Security Mode Complete, TS 24.554[ Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3 ]  [72]. The SL-SRB using this SCCH configuration is named as SL-SRB2. Parameters that are specified for NR sidelink discovery, which is used for the sidelink signalling radio bearer of NR sidelink discovery messages (e.g., Announcement message, Solicitation message and Response message, see TS 23.304[ Proximity based Services (ProSe) in the 5G System (5GS) ]  [65]). The SL-SRB using this SCCH configuration is named as SL-SRB4. Parameters that are specified for NR sidelink L2 U2N Relay operations, which is used for the PC5 Relay RLC channel for Remote UE's SRB0 message transmission/reception. The PC5 Relay RLC channel using this configuration is named as SL-RLC0. Parameters that are specified for NR sidelink L2 U2U Relay operations, which is used for the PC5 Relay RLC channel for U2U Remote UE's SL-SRB0/1/2/3 message transmission/reception with the peer U2U Remote UE. The PC5 Relay RLC channel using this configuration is named as SL-U2U-RLC.