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 SyncRef UE, 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. 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 SyncRef UE, 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.
2. The one or more non-transitory, computer-readable media of claim 1 , wherein the UE is to monitor for the PSBCH synchronization signals in a PSBCH monitoring occasion and the one or more subframes of data reception comprise up to two subframes of data reception within the PSBCH monitoring occasion.
3. The one or more non-transitory, computer-readable media of claim 1 , wherein the second SyncRef UE and the UE are asynchronous.
4. The one or more non-transitory, computer-readable media of claim 1 , wherein the first SyncRef UE and the UE are synchronized.
5. The one or more non-transitory, computer-readable media of claim 1 , wherein the one or more subframes comprise one or more subframes scheduled to receive data via a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
6. The one or more non-transitory, computer-readable media of claim 1 , wherein the one or more subframes comprise two subframes.
7. The one or more non-transitory, computer-readable media 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 (V 2 X) synchronization reference source.
8. The one or more non-transitory, computer-readable media 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 (V 2 X) synchronization reference source.
9. The one or more non-transitory, computer-readable media of claim 1 , wherein the UE is to monitor for the PSBCH synchronization signals for selection/reselection of a vehicle-to-everything (V 2 X) synchronization reference source.
10. The one or more non-transitory, computer-readable media of claim 1 , wherein the UE comprises a vehicle user equipment.
11. A user equipment (UE), comprising:
a memory configured to store program instructions and to store an indication of data exchange timing for a first synchronization reference (SyncRef) UE; and
a processor, upon executing the program instructions, configured to:
monitor for physical sidelink broadcast channel (PSBCH) synchronization signals from a second SyncRef UE during a PSBCH monitoring occasion; and
drop one or more subframes scheduled for data reception based on the indication of the data exchange timing within the PSBCH monitoring occasion.
12. The UE of claim 11 , wherein the one or more subframes comprises two subframes.
13. The UE of claim 11 , wherein the UE and the first SyncRef UE are asynchronous, and wherein the UE and the second SyncRef UE are asynchronous.
14. The UE of claim 11 , wherein the UE is configured with a global navigation satellite system (GNSS) synchronization reference source being a highest priority for a vehicle-to-everything (V 2 X) synchronization reference source, and wherein the UE and the first SyncRef UE are asynchronous.
15. The UE of claim 11 , wherein the one or more subframes are scheduled for data reception via a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH).
16. The UE of claim 11 , wherein the UE comprises a vehicle user equipment.
17. A user equipment (UE) configured to perform a selection/reselection of a synchronization reference source, the UE comprising:
a memory configured to store program instructions; and
a processor, upon executing the program instructions, configured to:
maintain a sidelink connection with a first synchronization reference (SyncRef) UE;
monitor for physical sidelink broadcast channel (PSBCH) synchronization signals from a second SyncRef UE for the selection/reselection of the SyncRef source; and
drop one or more subframes scheduled for data reception during the monitoring for the PSBCH synchronization signals.
18. The UE of claim 17 , wherein the one or more subframes comprises two subframes.
19. The UE of claim 17 , wherein the UE is configured with a global navigation satellite system (GNSS) synchronization reference source as a highest priority for a vehicle-to-everything (V 2 X) synchronization reference source.
20. The UE of claim 17 , wherein the UE is configured with a serving cell/primary cell (PCell) synchronization reference source being a highest priority for a vehicle-to-everything (V 2 X) synchronization reference source.