Method and system for handling of closed access group related procedure

1. A method performed by a base station in a wireless communication system, comprising:

receiving, by the base station, a radio resource control (RRC) resume request message in a closed access group (CAG) cell from a user equipment (UE) in an RRC inactive state that is registered to a network;

identifying, by the base station, whether at least one CAG identifier (ID) broadcasted in the CAG cell is included in an allowed CAG list of the UE in response to receiving the RRC resume request message; and

proceeding, by the base station, with an RRC resume procedure in the CAG cell in response to the base station identifying that the at least one CAG ID is included in the allowed CAG list.

2. The method as claimed in claim 1 , further comprises releasing an RRC connection by sending an RRC message in response to the at least one CAG ID not being included in the allowed CAG list.

3. The method as claimed in claim 2 , wherein the RRC message is at least one of an RRC connection release message and an RRC connection reject message.

4. The method as claimed in claim 2 , wherein the RRC message comprises an information element indicating that the at least one CAG ID is not subscribed based on the released RRC connection.

5. The method as claimed in claim 2 , wherein the RRC message comprises the allowed CAG list based on the released RRC connection.

6. The method as claimed in claim 1 , wherein the at least one CAG ID is identified based on mobility restrictions received from an Access and Mobility Management function (AMF) entity, and

wherein the base station receives the allowed CAG list from the AMF entity.

7. The method as claimed in claim 6 , wherein the mobility restrictions correspond to a mobility related subscription information of the UE, and

wherein the mobility related subscription information comprises at least one of a Radio Access Technology (RAT) restriction, a forbidden area, a service area restriction, a core network type restriction, and closed access group information.

8. The method as claimed in claim 1 , wherein the base station receives the RRC resume request message in response to the UE initiating the RRC resume procedure for transitioning from an RRC inactive state to an RRC connected state in the CAG cell.

9. A base station in a wireless communication system, comprising:

a radio communications circuitry; and

a processing circuitry, coupled with the radio communications circuitry, configured to:

receive a radio resource control (RRC) resume request message in a closed access group (CAG) cell from a user equipment (UE) in an RRC inactive state that is registered to a network;

identify whether at least one CAG identifier (ID) broadcasted in the CAG cell is included in an allowed CAG list of the UE in response to receiving the RRC resume request message; and

proceed with an RRC resume procedure in the CAG cell in response to the base station identifying that the at least one CAG ID is included in the allowed CAG list.

10. The base station as claimed in claim 9 , wherein the processing circuitry is configured to release an RRC connection by sending an RRC message in response to the at least one CAG ID not being included in the allowed CAG list.

11. The base station as claimed in claim 10 , wherein the RRC message is at least one of an RRC connection release message and an RRC connection reject message.

12. The base station as claimed in claim 10 , wherein the RRC message comprises an information element indicating that the at least one CAG ID is not subscribed based on the released RRC connection.

13. The base station as claimed in claim 10 , wherein the RRC message comprises the allowed CAG list based on the released RRC connection.

14. The base station as claimed in claim 9 , wherein the processing circuitry is configured to identify the at least one CAG identifier based on mobility restrictions received from an Access and Mobility Management function (AMF) entity,

wherein the processing circuitry is configured to receive the allowed CAG list from the AMF entity, and

wherein the processing circuitry is configured to receive the RRC resume request message in response to the UE initiating the RRC resume procedure for transitioning from an RRC inactive state to an RRC connected state in the CAG cell.

15. The base station as claimed in claim 14 , wherein the mobility restrictions correspond to a mobility related subscription information of the UE, and

wherein the mobility related subscription information comprises at least one of a Radio Access Technology (RAT) restriction, a forbidden area, a service area restriction, a core network type restriction, and closed access group information.

16. A method performed by a user equipment (UE) in a wireless communication system, comprising:

transmitting a radio resource control (RRC) resume request message in a closed access group (CAG) cell to a base station, wherein the UE in an RRC inactive state is registered to a network;

receiving an RRC resume message from the base station in response to an identification by the base station that at least one CAG identifier (ID) broadcasted in a CAG cell is included in an allowed CAG list of the UE.

17. The method as claimed in claim 16 , further comprises

receiving an RRC message comprising an information element from the base station indicating that the at least one CAG ID is not subscribed when the at least one CAG ID broadcasted by the CAG cell is not included in the allowed CAG list;

receiving the RRC message comprising the allowed CAG list from the base station; and

performing one of:

removing the at least one CAG ID from the allowed CAG list based on the received information element, and

replacing a stored CAG list with the received allowed CAG list based on the received information element.

18. The method as claimed in claim 17 , wherein the RRC message is at least one of an RRC connection release message and an RRC connection reject message.

19. A User Equipment in a wireless communication system, comprising:

a radio communications circuitry; and

a processing circuitry, coupled with the radio communications circuitry, configured to:

transmit a radio resource control (RRC) resume request message in a closed access group (CAG) cell to a base station, wherein the UE in an RRC inactive state is registered to a network, and

receive an RRC resume message from the base station in response to an identification by the base station that at least one CAG identifier (ID) broadcasted in a CAG cell is included in an allowed CAG list of the UE.

20. The UE as claimed in claim 19 , the processing circuitry is further configured to:

receive an RRC message comprising an information element from the base station indicating that the at least one CAG ID is not subscribed when the at least one CAG ID broadcasted by the CAG cell is not included in the allowed CAG list;

receive the RRC message comprising the allowed CAG list from the base station; and

perform one of:

remove the at least one CAG ID from the allowed CAG list based on the received information element, and

replace a stored CAG list with the received allowed CAG list based on the received information element,

wherein the RRC message is at least one of an RRC connection release message and a RRC connection reject message.