Granted Patent B2

US 12,262,445 · App. 17/788,602 · Granted Mar 25, 2025

Inventors: Hung-Chen Chen (Taipei, TW); Mei-Ju Shih (Taipei, TW)

Assignee: SHARP KABUSHIKI KAISHA

H04W76/38H04W56/0045H04W72/23H04W74/0833H04W76/27

Abstract

Claims (43)

1. A method of-for small data transmission performed by a user equipment (UE), the method comprising:

receiving, from a base station (BS), a radio resource control (RRC) release message, the RRC release message including a configured grant configuration and a first timer associated with the configured grant configuration, the configured grant configuration indicating an uplink (UL) resource;

transitioning to an RRC_INACTIVE state in response to receiving the RRC release message;

starting the first timer in response to receiving the RRC release message;

determining whether the UL resource is valid, the UL resource being invalid at least when the first timer expires; and

transmitting UL data on the UL resource after the UE determines that the UL resource is valid.

2. The method of claim 1 , wherein

the UL resource is further determined to be invalid when a serving cell of the UE is different from a cell that is supported by the BS and from which the UE receives the RRC release message.

3. The method of claim 1 , wherein

the UL resource is further determined to be invalid when a Reference Symbol Received Power (RSRP) of a Synchronization Signal Block (SSB) associated with the UL resource is not greater than a threshold.

4. The method of claim 1 , wherein the RRC release message further indicates one or more data radio bearers (DRBs) allowed for a UL data transmission while the UE is in the RRC_INACTIVE state.

5. The method of claim 1 , wherein

the UL resource is further determined to be invalid when a size of the UL data to be transmitted is larger than a threshold associated with the configured grant configuration.

6. The method of claim 1 , further comprising:

reporting, to the BS, a capability of supporting the small data transmission via the configured grant configuration while the UE is in the RRC_INACTIVE state.

7. The method of claim 1 , further comprising:

reporting, to the BS, a capability of supporting the small data transmission via a random access (RA) procedure while the UE is in the RRC_INACTIVE state.

8. The method of claim 7 , further comprising:

determining whether to perform the RA procedure for the small data transmission when the UE determines that the UL resource is invalid.

9. The method of claim 7 , further comprising:

receiving, via system information, from the BS, an indication that indicates whether the RA procedure for the small data transmission is allowed.

10. The method of claim 1 , wherein the UL resource includes a physical uplink shared channel (PUSCH) resource.

11. A user equipment (UE) for performing small data transmission, the UE comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor and storing computer-executable instructions that, when executed by the at least one processor, cause the UE to:

receive, from a base station (BS), a radio resource control (RRC) release message, the RRC release message including a configured grant configuration and a first timer associated with the configured grant configuration, the configured grant configuration indicating an uplink (UL) resource;

transition to an RRC_INACTIVE state in response to receiving the RRC release message;

start the first timer in response to receiving the RRC release message;

determine whether the UL resource is valid, the UL resource being invalid at least when the first timer expires; and

transmit UL data on the UL resource after the UE determines that the UL resource is valid.

12. The UE of claim 11 , wherein the UL resource is further determined to be invalid when a serving cell of the UE is different from a cell that is supported by the BS and from which the UE receives the RRC release message.

13. The UE of claim 11 , wherein the UL resource is further determined to be invalid when a Reference Symbol Received Power (RSRP) of a Synchronization Signal Block (SSB) associated with the UL resource is not greater than a threshold.

14. The UE of claim 11 , wherein the RRC release message further indicates one or more data radio bearers (DRBs) allowed for a UL data transmission while the UE is in the RRC_INACTIVE state.

15. The UE of claim 11 , wherein the UL resource is further determined to be invalid when a size of the UL data to be transmitted is larger than a threshold associated with the configured grant configuration.

16. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

report, to the BS, a capability of supporting the small data transmission via the configured grant configuration while the UE is in the RRC_INACTIVE state.

17. The UE of claim 11 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

report, to the BS, a capability of supporting the small data transmission via a random access (RA) procedure while the UE is in the RRC_INACTIVE state.

18. The UE of claim 17 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

determine whether to perform the RA procedure for the small data transmission when the UE determines that the UL resource is invalid.

19. The UE of claim 17 , wherein the computer-executable instructions, when executed by the at least one processor, further cause the UE to:

receive, via system information, from the BS, an indication that indicates whether the RA procedure for the small data transmission is allowed.

20. The UE of claim 11 , wherein the UL resource includes a physical uplink shared channel (PUSCH) resource.

Assignments (2)

Continuity (2)

References Cited (13)