Granted Patent B2

US 12,432,559 · App. 18/610,092 · Granted Sep 30, 2025

Inventors: Samir Ferdi (Kirkland, CA); Alec Brusilovsky (Downingtown, PA); Guanzhou Wang (Brossard, CA)

Assignee: INTERDIGITAL PATENT HOLDINGS, INC.

H04W12/08H04W12/106H04W60/00

Abstract

Claims (46)

1. A method for wireless communications, performed by a wireless transmit/receive unit (WTRU) the method comprising:

sending, to a network entity, a first registration request via a first closed access group (CAG) cell, the first registration request indicating a capability for CAG;

receiving a registration reject message having new CAG identifier (CAG-ID) information;

updating a CAG configuration using the new CAG-ID information;

selecting a second CAG cell based on the new CAG-ID information; and

sending, to the network entity, a second registration request via the selected second CAG cell.

2. The method of claim 1 , wherein updating the CAG configuration comprises removing stored CAG-ID information and adding the new CAG-ID information.

3. The method of claim 1 , wherein receiving a registration reject message having new CAG-ID information comprises receiving the registration reject message as integrity protected.

4. The method of claim 1 , wherein receiving a registration reject message having new CAG-ID information comprises receiving new CAG-ID information from an access and mobility management function.

5. The method of claim 1 , further comprising, before the sending of the first registration request:

identifying a first set of hashed identifiers, IDs, and a first random number based on received system information, wherein each ID of the first set of hashed IDs is individually hashed using at least the first random number;

calculating a first hash value for each ID of a second set of IDs using at least the first random number; and

determining whether at least a hashed ID of the second set of IDs matches a hashed ID of the first set of hashed IDs.

6. The method of claim 5 , further comprising:

calculating a second hash value, using at least a second random number, for at least an ID associated with a hashed ID of the second set of IDs that matches a hashed ID of the first set of hashed IDs, based on the determination that at least a hashed ID of the second set of IDs matches a hashed ID of the first set of IDs, wherein the first registration request is a message comprising any of: information of the second random number, and the ID hashed by the second random number.

7. The method of claim 6 , wherein the second hash value is calculated using the second random number and a wireless transmit/receive unit, WTRU, ID assigned by a network.

8. The method of claim 5 , wherein the first set of hashed IDs comprises one or more hashed CAG-IDs and wherein the second set of IDs comprises one or more pre-configured allowed CAG-IDs.

9. A wireless transmit/receive unit (WTRU) comprising circuitry, including a transmitter, a receiver, a processor, and memory, the WTRU configured to:

send, to a network entity, a first registration request via a first closed access group (CAG) cell, wherein the first registration request indicates a capability for CAG;

receive a registration reject message having new CAG identifier (CAG-ID) information;

update a CAG configuration using the new CAG-ID information;

select a second CAG cell based on the new CAG-ID information; and

send, to the network entity, a second registration request via the selected CAG cell.

10. The WTRU of claim 9 , wherein the WTRU update of the CAG configuration comprises removing stored CAG-ID information and adding the new CAG-ID information.

11. The WTRU of claim 9 , wherein the WTRU is configured to receive an integrity protected registration reject message.

12. The WTRU of claim 9 , wherein the WTRU is configured to receive the registration reject message from an access and mobility management function.

13. The WTRU of claim 9 , wherein the WTRU is further configured, before the sending of the first registration request, to:

identify a first set of hashed identifiers, IDs, and a first random number based on received system information, wherein each ID of the first set of hashed IDs is individually hashed using at least the first random number;

calculate a first hash value for each ID of a second set of IDs using at least the first random number;

determine whether at least a hashed ID of the second set of IDs matches a hashed ID of the first set of hashed IDs; and

calculate a second hash value, using at least a second random number, for at least an ID associated with a hashed ID of the second set of IDs that matches a hashed ID of the first set of hashed IDs, based on the determination that at least a hashed ID of the second set of IDs matches a hashed ID of the first set of IDs, wherein the first registration request is a message comprising any of: information of the second random number, and the ID hashed by the second random number.

14. The WTRU of claim 13 , wherein the second hash value is calculated using the second random number and a wireless transmit/receive unit, WTRU, ID assigned by a network.

15. The WTRU of claim 13 , wherein the first set of hashed IDs comprises one or more hashed CAG-IDs and wherein the second set of IDs comprises one or more pre-configured allowed CAG-IDs.

16. A non-transient computer-readable storage device having instructions thereon, which when executed by a computer, performs a method comprising:

sending, to a network entity, a first registration request via a first closed access group (CAG) cell, the first registration request indicating a capability for CAG;

receiving a registration reject message having new CAG identifier (CAG-ID) information;

updating a CAG configuration using the new CAG-ID information;

selecting a second CAG cell based on the new CAG-ID information; and

sending, to the network entity, a second registration request via the selected second CAG cell.

17. The device of claim 16 , wherein updating the CAG configuration comprises removing stored CAG-ID information and adding the new CAG-ID information.

18. The method of claim 1 , wherein receiving a registration reject message having new CAG-ID information comprises receiving the registration reject message as integrity protected.

19. The method of claim 1 , wherein receiving a registration reject message having new CAG-ID information comprises receiving new CAG-ID information from an access and mobility management function.

20. The method of claim 1 , further comprising, before the sending of the first registration request:

identifying a first set of hashed identifiers, IDs, and a first random number based on received system information, wherein each ID of the first set of hashed IDs is individually hashed using at least the first random number;

calculating a first hash value for each ID of a second set of IDs using at least the first random number; and

determining whether at least a hashed ID of the second set of IDs matches a hashed ID of the first set of hashed IDs.

Assignments (2)

Continuity (5)

References Cited (37)