Sidelink synchronization assistance

A base station, comprising:

• a processor;
• a wireless transceiver communicatively coupled to the processor and configured to communicate over a cellular carrier;
• and
• a memory communicatively coupled to the processor, wherein the processor and the memory are configured to:
• identify a detection time window, wherein the detection time window comprises a sidelink synchronization resource configured for transmission of a sidelink synchronization signal on a sidelink carrier;
• and
• transmit, via the cellular carrier, an indication of the detection time window to a plurality of user equipment (UEs) communicating over the sidelink carrier.

A user equipment (UE), comprising:

• a processor;
• a wireless transceiver communicatively coupled to the processor and configured to communicate over a cellular carrier with a base station and over a sidelink carrier with a set of one or more sidelink devices;
• and
• a memory communicatively coupled to the processor, wherein the processor and the memory are configured to:
• receive, from the base station, an indication of a detection time window comprising a sidelink synchronization resource configured for transmission of a sidelink synchronization signal on the sidelink carrier;
• and
• detect the sidelink synchronization signal on the sidelink carrier within the detection time window to synchronize communication with the set of one or more sidelink devices on the sidelink carrier.