Section: 9.10 Timing
Content: Transmission of a sidelink radio frame number from the UE shall start seconds before the start of the corresponding timing reference frame at the UE. The UE is not required to receive sidelink or downlink transmissions earlier than after the end of a sidelink transmission. For PSDCH transmission and sidelink synchronization signal transmission for PSDCH: if the UE has a serving cell fulfilling the S criterion according to [10, clause 5.2.3.2] - the timing of reference radio frame equals that of downlink radio frame of the cell c as given in Clause 14.3.1 of [4] and - is given by clause 8.1, otherwise - the timing of reference radio frame is implicitly obtained from [4] and - . For all other sidelink transmissions: if the UE has a serving cell fulfilling the S criterion according to [10, clause 5.2.3.2] - the timing of reference radio frame equals that of downlink radio frame in the cell with the same uplink carrier frequency as the sidelink and - is given by clause 8.1, otherwise - the timing of reference radio frame is implicitly obtained from [4] and - . Figure 9.9-1: Sidelink timing relation. The quantity differs between channels and signals according to