Distinguishing downlink (DL) signal synchronization blocks (SSBs) and sidelink (SL) SSBs in a wireless communications network. A base station may configure a group of candidate SSB positions in a SSB burst set, specifying a subgroup of candidate SSB positions for DL SSBs and specifying a remaining subgroup as candidate SSB positions for SL SSBs, transmit an indication of the subgroup of candidate SSB positions for SL SSBs to a first UE and transmit an indication of the subgroup of candidate SSB positions for DL SSBs to a second UE. The first UE may transmit SL SSBs on the subgroup of candidate SSB positions for SL SSBs and the second UE may use the indication of the subgroup of candidate SSB positions for DL SSBs to distinguish DL SSBs received from the base station and SL SSBs received from the first UE. Alternative arrangements include the first UE prioritising DL SSB transmission on shared candidate SSB positions by muting SL SSB transmission on the shared positions, the base station multiplexing candidate SSB positions for SL SSBs and DL SSBs in the time domain and the base station configuring SL SSB transmissions on off-raster frequency positions in the frequency domain.
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