The UE may transmit or receive NR sidelink communication/discovery if it fulfils the condition(s) defined in clause 5.8.2 of TS 38.331. When UE is in-coverage for sidelink operation as defined in clause 8.2, the UE may perform NR sidelink communication/discovery according to SIB12, and when out-of-coverage for sidelink, the UE may perform NR sidelink communication/discovery according to SL-PreconfigurationNR or according to SIB12 of the cell on the frequency which provides inter-carrier NR sidelink configuration, or according to SIB12 received from the connected L2 U2N Relay UE as specified in TS 38.331. The UE shall not perform NR sidelink communication/discovery according to SL-PreconfigurationNR if the UE detects a cell providing NR sidelink configuration or inter-carrier NR sidelink configuration for the frequency UE is interested to perform NR sidelink communication/discovery on, or if the UE is a L2 U2N Remote UE and has received SIB12 from the connected L2 U2N Relay UE. The UE may transmit or receive V2X sidelink communication if it fulfills the condition(s) defined in clause 5.10.1d of TS 36.331. When UE is in-coverage for sidelink operation as defined in clause 8.2, the UE may perform V2X sidelink communication according to SIB13/ SIB14 of the cell on an NR frequency. The UE may transmit or receive SL-PRS for ranging/sidelink positioning if it fulfils the conditions defined in TS 38.331. The U2N Remote UE, the U2N Relay UE, the U2U Remote UE, or the U2U Relay UE may transmit NR sidelink relay discovery (i.e., as specified in TS 23.304) if it fulfills the condition(s) defined in TS 38.331. For NR sidelink broadcast and groupcast, the UE may obtain SL DRX configuration from SIB12 (for in-coverage UE, as defined in clause 8.2, in RRC_IDLE and RRC_INACTIVE state; or for out-of-coverage, UE as defined in clause 8.2, on the frequency which the UE is configured to perform NR sidelink communication/discovery and which is included in sl-FreqInfoList/sl-FreqInfoListSizeExt in SIB12) or SL-PreconfigurationNR (for non L2 U2N Remote UE out-of-coverage, as defined in clause 8.2, on the frequency which the UE is configured to perform NR sidelink communication/discovery and which is not included in sl-FreqInfoList/sl-FreqInfoListSizeExt in SIB12). For inter-UE coordination (IUC) information configuration, the UE may obtain it from SIB12 (for in-coverage UE, as defined in clause 8.2, in RRC_IDLE and RRC_INACTIVE state; or for non L2 U2N Remote UE out-of-coverage, as defined in clause 8.2, on the frequency which UE is configured to perform NR sidelink communication and which is included in sl-FreqInfoList/sl-FreqInfoListSizeExt in SIB12) or SL-PreconfigurationNR (for non L2 U2N Remote UE out-of-coverage, as defined in clause 8.2, on the frequency which UE is configured to perform NR sidelink communication and which is not included in sl-FreqInfoList/sl-FreqInfoListSizeExt in SIB12). For ranging/sidelink positioning, the UE may obtain the configuration from SIB23 (for in-coverage UE, as defined in clause 8.2, in RRC_IDLE and RRC_INACTIVE state) or SL-PreconfigurationNR (for out-of-coverage UE, as defined in clause 8.2).

The requirements defined in this clause for sidelink operation (including sidelink relay operations) apply for UEs in RRC_IDLE, RRC_INACTIVE and in RRC_CONNECTED. When UE is interested to perform NR sidelink communication/discovery and ranging/sidelink positioning on non-serving frequency, it may perform measurements on that frequency or the frequencies which can provide inter carrier NR sidelink configuration for that frequency for cell selection and reselection purpose in accordance with TS 38.133. When UE is interested to perform V2X sidelink communication on non-serving frequency, it may perform measurements on that frequency or the frequencies which can provide inter carrier V2X sidelink configuration for that frequency for cell selection and intra-frequency reselection purpose in accordance with TS 38.133. If the UE detects at least one cell on the frequency which UE is configured to perform NR sidelink communication/discovery and ranging/sidelink positioning on fulfilling the S criterion in accordance with clause 8.2.1, it shall consider itself to be in-coverage for NR sidelink communication/discovery and ranging/sidelink positioning on that frequency. If the UE cannot detect any cell on that frequency meeting the S criterion, it shall consider itself to be out-of-coverage for NR sidelink communication/discovery and ranging/sidelink positioning on that frequency. If the UE detects at least one cell on the frequency which UE is configured to perform V2X sidelink communication on fulfilling the S criterion in accordance with clause 8.2.1, it shall consider itself to be in-coverage for V2X sidelink communication on that frequency. If the UE cannot detect any cell on that frequency meeting the S criterion, it shall consider itself to be out-of-coverage for V2X sidelink communication on that frequency. If the UE has selected a cell on a non-serving frequency for V2X sidelink communication, it shall perform additional intra-frequency reselection process to select a better cell for sidelink operation on that frequency in accordance with clause 8.2.1. If the UE has selected a cell on a non-serving frequency for NR sidelink communication/discovery, it shall perform additional reselection process to select a better cell for sidelink operation in accordance with clause 8.2.1.