Synchronization for V2X carrier aggregation

A user equipment (UE) for wireless communications, comprising:

• a processor;
• and
• a memory in communication with the processor, wherein the memory includes instructions executable by the processor to:
• identify a set of synchronization carriers that are configured for a first UE;
• identify, at the first UE, one or more frequency carriers used to establish communication with one or more second UEs;
• determine a subset of synchronization carriers from the set of synchronization carriers based on identification of the one or more frequency carriers used to establish communication between the first UE and the one or more second UEs, wherein the subset of synchronization carriers comprises multiple synchronization carriers;
• determine, for each synchronization carrier in the subset of synchronization carriers, a synchronization source for each synchronization carrier in the subset of synchronization carriers;
• select one synchronization carrier of the subset of synchronization carriers based on the determined synchronization sources and in accordance with a synchronization source priority;
• and
• establish communication between the first UE and the one or more second UEs over the one or more frequency carriers based on a timing and frequency synchronization provided by the synchronization source associated with the selected one synchronization carrier.

A non-transitory computer readable medium for wireless communications comprising code for:

• identifying a set of synchronization carriers that are configured for a first user equipment (UE);
• identifying, at the first UE, one or more frequency carriers used to establish communication with one or more second UEs;
• determining a subset of synchronization carriers from the set of synchronization carriers based on identification of the one or more frequency carriers used to establish communication between the first UE and the one or more second UEs, wherein the subset of synchronization carriers comprises multiple synchronization carriers;
• determining, for each synchronization carrier in the subset of synchronization carriers, a synchronization source for each synchronization carrier in the subset of synchronization carriers;
• selecting one synchronization carrier of the subset of synchronization carriers based on the determined synchronization sources and in accordance with a synchronization source priority;
• and
• establishing communication between the first UE and the one or more second UEs over the one or more frequency carriers based on a timing and frequency synchronization provided by the synchronization source associated with the selected one synchronization carrier.

An apparatus for wireless communication, comprising:

• means for identifying a set of synchronization carriers that are configured for a first user equipment (UE);
• means for identifying, at the first UE, one or more frequency carriers used to establish communication with one or more second UEs;
• means for determining a subset of synchronization carriers from the set of synchronization carriers based on identification of the one or more frequency carriers used to establish communication between the first UE and the one or more second UEs, wherein the subset of synchronization carriers comprises multiple synchronization carriers;
• means for determining, for each synchronization carrier in the subset of synchronization carriers, a synchronization source for each synchronization carrier in the subset of synchronization carriers;
• means for selecting one synchronization carriers based on the determined synchronization sources and in accordance with a synchronization source priority;
• and
• means for establishing communication between the first UE and the one or more second UEs over the one or more frequency carriers based on a timing and frequency synchronization provided by the synchronization source associated with the selected one synchronization carrier.