Carrier aggregation and high order modulation in vehicle-to-vehicle (V2V) sidelink communication

A non-transitory computer-readable storage medium storing program instructions executable by one or more processors to cause a user equipment (UE) to:

• detect a sidelink synchronization signal (SLSS) from another UE on a synchronization component carrier (CC) of a carrier aggregation, wherein the synchronization CC is allocated for V2V sidelink transmissions of control information or data, and wherein the carrier aggregation includes one or more second CCs allocated for V2V sidelink transmissions of data;
• determine, based on the detected SLSS, a common time synchronization for the synchronization CC and the second CCs for vehicle-to-vehicle (V2V) sidelink transmissions in accordance with the carrier aggregation;
• select, from the synchronization CC and the second CCs, a CC for a V2V sidelink transmission by the UE;
• and
• encode, based on a block of data bits, a physical sidelink shared channel (PSSCH) for the V2V sidelink transmission by the UE on the selected CC;
• and
• wherein, if the SLSS from the other UE is not detected:
• encode an SLSS to enable determination of the common time synchronization for the synchronization CC and the second CC by the other UE, wherein the SLSS is encoded for transmission on the synchronization CC.

A method, comprising:

• by a user equipment (UE) configured for carrier aggregation using a synchronization component carrier (CC) and a second CC:
• attempting to detect a sidelink synchronization signal (SLSS) from another UE on the synchronization CC;
• if the SLSS from the other UE is detected:
• determining, based on the detected SLSS, a common time synchronization for the carrier aggregation for vehicle-to-vehicle (V2V) sidelink transmissions to the other UE;
• and
• if the SLSS from the other UE is not detected:
• encoding an SLSS to enable determination of the common time synchronization for the synchronization CC and the second CC by the other UE, wherein the SLSS is encoded for transmission on the synchronization CC.