Synchronization signal block configurations for sidelink communications

A first sidelink user equipment (UE) comprising:

• a memory;
• a transceiver;
• and
• at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to:
• transmit, to a second sidelink UE, a first sidelink synchronization block (S-SSB) in a scheduled S-SSB slot;
• perform a first listen-before-talk (LBT) procedure in an unlicensed frequency band;
• and
• transmit, to the second sidelink UE, a second S-SSB in a slot before a next scheduled S-SSB slot based on the first LBT procedure being unsuccessful.

A first sidelink user equipment (UE) comprising:

• a memory;
• a transceiver;
• and
• at least one processor coupled to the memory and the transceiver, wherein the first sidelink UE is configured to:
• transmit, to a wireless communications device, a request for a sidelink synchronization block (S-SSB) based on completion of a timer associated with an S-SSB interval;
• and
• receive, from the wireless communications device in an unlicensed frequency band, the S-SSB in a slot before a next scheduled S-SSB slot based on the request.