Vehicle to everything synchronization reference selection and reselection
Apparatuses, systems and methods associated with asynchronous synchronization reference source selection and reselection for wireless communication devices are disclosed herein. In embodiments, one or more non-transitory, computer-readable media having instructions stored thereon, wherein the instructions, in response to execution by a user equipment (UE), cause the UE to establish a sidelink connection with a first synchronization reference (SyncRef) UE, and monitor for physical sidelink broadcast channel (PSBCH) synchronization signals from a second SyncRefUE, wherein the UE is to drop one or more subframes of data reception of the sidelink connection with the first SyncRef UE when the UE monitors for the PSBCH synchronization signals. Other embodiments may be described and/or claimed.
1. A user equipment (UE), comprising:
a memory configured to store program instructions; and
a processor, upon executing the program instructions, configured to:
while connected to a first UE, determine a monitoring occasion for monitoring one or more signals from a second UE for synchronizing with the second UE; and
drop one or more subframes from the first UE during the monitoring occasion.
2. The UE of claim 1 , wherein the one or more signals from the second UE comprise at least one of sidelink synchronization signals (SLSS) or a physical sidelink broadcast channel (PSBCH).
3. The UE of claim 2 , wherein the one or more subframes from the first UE overlap with a subframe from the second UE that includes the at least one of the SLSS or the PSBCH.
4. The UE of claim 1 , wherein the one or more subframes from the first UE comprise one or more subframes scheduled to receive data via at least one of a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
5. The UE of claim 1 , wherein to drop the one or more subframes from the first UE, the processor is configured to drop up to two subframes from the first UE during the monitoring occasion.
6. The UE of claim 1 , wherein to drop the one or more subframes from the first UE, the processor is configured to drop up to three subframes from the first UE during the monitoring occasion.
7. The UE of claim 1 , wherein the UE is configured with a global navigation satellite system (GNSS) synchronization reference source being a highest priority for a vehicle-to-everything (V2X) synchronization reference source.
8. The UE of claim 1 , wherein the UE is configured with a serving cell/primary cell (PCell) synchronization reference source being a highest priority for a vehicle-to-everything (V2X) synchronization reference source.
9. A method, comprising:
while connected to a first user equipment (UE), determining a monitoring occasion for monitoring one or more signals from a second UE for synchronizing with the second UE;
dropping one or more subframes from the first UE during the monitoring occasion; and
receiving, from the second UE and during the monitoring occasion, the one or more signals.
10. The method of claim 9 , wherein the one or more signals from the second UE comprise at least one of sidelink synchronization signals (SLSS) or a physical sidelink broadcast channel (PSBCH).
11. The method of claim 10 , wherein the one or more subframes from the first UE overlap with a subframe from the second UE that includes the at least one of the SLSS or the PSBCH.
12. The method of claim 9 , wherein the one or more subframes from the first UE comprise one or more subframes scheduled to receive data via at least one of a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
13. The method of claim 9 , wherein dropping the one or more subframes from the first UE comprises dropping up to two subframes from the first UE during the monitoring occasion.
14. The method of claim 9 , wherein dropping the one or more subframes from the first UE comprises dropping up to three subframes from the first UE during the monitoring occasion.
15. A non-transitory computer-readable medium storing instructions that, when executed by a processor of an electronic device, cause the processor to perform operations, the operations comprising:
while connected to a first user equipment (UE), determining a monitoring occasion for monitoring one or more signals from a second UE for synchronizing with the second UE;
dropping one or more subframes from the first UE during the monitoring occasion; and
receiving, from the second UE and during the monitoring occasion, the one or more signals.
16. The computer-readable medium of claim 15 , wherein the one or more signals from the second UE comprise at least one of sidelink synchronization signals (SLSS) or a physical sidelink broadcast channel (PSBCH).
17. The computer-readable medium of claim 16 , wherein the one or more subframes from the first UE overlap with a subframe from the second UE that includes the at least one of the SLSS or the PSBCH.
18. The computer-readable medium of claim 15 , wherein the one or more subframes from the first UE comprise one or more subframes scheduled to receive data via at least one of a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
19. The computer-readable medium of claim 15 , wherein dropping the one or more subframes from the first UE comprises dropping up to two subframes from the first UE during the monitoring occasion.
20. The computer-readable medium of claim 15 , wherein dropping the one or more subframes from the first UE comprises dropping up to three subframes from the first UE during the monitoring occasion.