Granted Patent B2

US 12,732,928 · App. 17/310,936 · Granted Sep 8, 2026

Inventors: Alexey Khoryaev (Nizhny Novgorod, RU); Sergey Panteleev (Nizhny Novgorod, RU); Artyom Putilin (Kstovo, RU); Sergey Sosnin (Zavolzhie, RU); Mikhail Shilov (Nizhny Novgorod, RU)

Assignee: APPLE INC.

H04W56/001G01S19/03H04W4/40

Abstract

Claims (54)

1 . A method, performed by a user equipment (UE), for sidelink synchronization for new radio vehicle-to-everything (NR V2X) communication in a wireless communication system, the method comprising:

performing an initial sidelink synchronization by:

detecting a valid synchronization source, wherein the valid synchronization source is a first detected synchronization source for sidelink communication, and

triggering, without regard to a priority associated with the valid synchronization source, synchronization and sidelink communication with the detected valid synchronization source;

deriving a sidelink synchronization signal (SLSS) identifier (ID) and physical sidelink broadcast channel (PSBCH) content, wherein deriving the SLSS ID and the PSBCH content is based at least in part on whether the UE is directly synchronized with a global navigation satellite system (GNSS), indirectly synchronized with the GNSS, directly synchronized with the base station, indirectly synchronized with the base station, or synchronized with an independent synchronization source,

wherein the PSBCH content includes a different synchronization hop information field, timing information field, and original synchronization source field that indicates whether the original synchronization source is a GNSS, network, or independent synchronization source based on a type of synchronization, and

wherein the SLSS ID is randomly selected from a pre-configured range of SLSS IDs for independent synchronization sources;

directly synchronizing with the GNSS after the initial sidelink synchronization in response to detecting the GNSS;

determining a loss of GNSS synchronization for the UE; and

performing, in response to the loss of GNSS synchronization, synchronization with a serving base station for the UE, wherein the serving base station is timing aligned with the GNSS timing of the UE.

2 . The method of claim 1 , wherein the synchronization with the serving base station is direct synchronization.

3 . The method of claim 1 , wherein the synchronization with the serving base station is indirect synchronization.

4 . The method of claim 1 , wherein prior to the loss of GNSS synchronization for the UE, the UE has a successful GNSS synchronization.

5 . The method of claim 4 , wherein the synchronization is direct synchronization.

6 . The method of claim 4 , wherein the synchronization is indirect synchronization.

7 . The method of claim 1 wherein the initial sidelink synchronization process is performed prior to determining the loss of GNSS synchronization for the UE, the initial sidelink synchronization process further comprising:

detecting a valid synchronization source without regard to a priority associated with the synchronization source;

attempting synchronization with the detected valid synchronization source; and

determining successful synchronization with the detected valid synchronization source.

8 . The method of claim 7 , the initial sidelink synchronization process further comprising:

searching for one or more high priority valid synchronization sources having a higher priority than the detected valid synchronization source with which the successful synchronization with the detected valid synchronization source is determined;

detecting a high priority valid synchronization source of the one or more high priority valid synchronization sources;

attempting synchronization with the detected high priority synchronization source; and

determining successful synchronization with the detected high priority synchronization source.

9 . The method of claim 8 , wherein the search for the one or more high priority valid synchronization sources occurs repeatedly during the initial sidelink synchronization process.

10 . The method of claim 1 , wherein the UE is preconfigured with sidelink parameters including subcarrier spacing and cyclic prefix type.

11 . An apparatus of a User Equipment (UE) for sidelink synchronization for new radio vehicle-to-everything (NR V2X) communication in a wireless communication system, the apparatus comprising:

a processor; and

a memory storing instructions that, when executed by the processor, configure the apparatus to:

perform an initial sidelink synchronization by:

detect a valid synchronization source, wherein the valid synchronization source is a first detected synchronization source for sidelink communication, and

trigger, without regard to a priority associated with the valid synchronization source, synchronization and sidelink communication with the detected valid synchronization source;

derive a sidelink synchronization signal (SLSS) identifier (ID) and physical sidelink broadcast channel (PSBCH) content, wherein deriving the SLSS ID and the PSBCH content is based at least in part on whether the UE is directly synchronized with a global navigation satellite system (GNSS), indirectly synchronized with the GNSS, directly synchronized with the base station, indirectly synchronized with the base station, or synchronized with an independent synchronization source,

wherein the PSBCH content includes a different synchronization hop information field, timing information field, and original synchronization source field that indicates whether the original synchronization source is a GNSS, network, or independent synchronization source based on a type of synchronization, and

wherein the SLSS ID is randomly selected from a pre-configured range of SLSS IDs for independent synchronization sources;

directly synchronize with the GNSS after the initial sidelink synchronization in response to detecting the GNSS;

determine a loss of GNSS synchronization for the UE; and

perform, in response to the loss of GNSS synchronization, synchronization with a serving base station for the UE, wherein the serving base station is timing aligned with the GNSS timing of the UE.

12 . The apparatus of claim 11 , wherein prior to the loss of GNSS synchronization for the UE, the UE has a successful GNSS synchronization.

13 . The apparatus of claim 12 , wherein the synchronization is direct synchronization.

14 . The apparatus of claim 12 , wherein the synchronization is indirect synchronization.

15 . A non-transitory computer-readable storage medium, the computer-readable storage medium including instructions that when executed by a user equipment (UE), cause the UE to:

perform an initial sidelink synchronization by:

detecting a first valid synchronization source, wherein the valid synchronization source is a first detected synchronization source for sidelink communication; and

triggering, without regard to a priority associated with the first valid synchronization source, synchronization and sidelink communication with the first valid synchronization source that was detected;

derive a sidelink synchronization signal (SLSS) identifier (ID) and physical sidelink broadcast channel (PSBCH) content, wherein deriving the SLSS ID and the PSBCH content is based at least in part on whether the UE is directly synchronized with a global navigation satellite system (GNSS), indirectly synchronized with the GNSS, directly synchronized with the base station, indirectly synchronized with the base station, or synchronized with an independent synchronization source,

wherein the PSBCH content includes a different synchronization hop information field, timing information field, and original synchronization source field that indicates whether the original synchronization source is a GNSS, network, or independent synchronization source based on a type of synchronization, and

wherein the SLSS ID is randomly selected from a pre-configured range of SLSS IDs for independent synchronization sources;

directly synchronize with the GNSS after the initial sidelink synchronization in response to detecting the GNSS;

determine a loss of GNSS synchronization for the UE; and

perform, in response to the loss of the GNSS synchronization, synchronization with a serving base station for the UE, wherein the serving base station is timing aligned with the GNSS timing of the identified synchronization source.

16 . The non-transitory computer readable-storage medium of claim 15 , wherein prior to determining the loss of GNSS synchronization for the UE, the UE has a successful GNSS synchronization.

17 . The non-transitory computer readable-storage medium of claim 16 , wherein the synchronization is direct synchronization.

18 . The non-transitory computer readable-storage medium of claim 16 , wherein the synchronization is indirect synchronization.

Continuity (2)

References Cited (19)