Method and user equipment for performing access control in 5GS

Patent metadata

Field	Value
Publication number	US-11457403-B2
Application number	US-201917041188-A
Country	US
Kind code	B2
Filing date	Feb 7, 2019
Priority date	May 8, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

Disclosed in the present specification is a method by which a user equipment (UE) performs access control. The method can comprise the steps of: transmitting a protocol data unit (PDU) session establishment or modification request message; and receiving a PDU session establishment or modification rejection message. The rejection message can comprise information on a backoff timer and session network slice selection assistance information (S-NSSAI). The method can comprise the steps of: driving the backoff timer while being linked with the S-NSSAI; and performing access control on the basis of the S-NSSAI.

First claim

What is claimed is:

1. A method for performing access control by a user equipment (UE), the method comprising:
performing a registration procedure with an Access and mobility Management Function (AMF) of a Visited Public Land Mobile Network (V-PLMN),
wherein the registration procedure comprises receiving a registration accept message from the AMF of the V-PLMN, wherein the registration accept message includes i) Allowed Network Slice Selection Assistance Information (NSSAI) and ii) Mapping of the Allowed NSSAI which is information for mapping of each Single NSSAI (S-NSSAI) of the Allowed NSSAI to S-NSSAIs of a Home PLMN (H-PLMN);
transmitting, to a Session Management Function (SMF) of the V-PLMN, a request message related to a Protocol Data Unit (PDU) session, wherein the request message includes i) an S-NSSAI from the Allowed NSSAI of a current access type, and ii) a corresponding S-NSSAI from the Mapping of the Allowed NSSAI;
based on an S-NSSAI-based congestion control being applied for the S-NSSAI, receiving, from the SMF of the V-PLMN, a reject message related to the PDU session, wherein the reject message includes i) information on a backoff timer, ii) information informing the UE of either the H-PLMN or the V-PLMN associated with the S-NSSAI and iii) a cause value;
operating the backoff timer in association with the S-NSSAI; and
performing the S-NSSAI-based congestion control for the S-NSSAI while the backoff timer is running.

2. The method of claim 1 , wherein the reject message further includes information on a Data Network Name (DNN).

3. The method of claim 2 , wherein the backoff timer is operated in further association with the DNN, and the access control is performed in further consideration of the DNN.

4. The method of claim 1 , further comprising:
receiving a UE Route Selection Policy (URSP), wherein the URSP includes the information informing the UE of either the H-PLMN or the V-PLMN associated with the S-NSSAI.

5. The method of claim 4 , wherein the information informing the UE of either the H-PLMN or the V-PLMN further indicates whether a target network node of the S-NSSAI-based congestion control is a SMF of the H-PLMN or the SMF of the V-PLMN.

6. The method of claim 1 , wherein the reject message further includes H-PLMN or V-PLMN information.

7. The method of claim 1 , wherein the reject message further includes information about whether a target network node of the S-NSSAI-based congestion control is a SMF of the H-PLMN or the SMF of the V-PLMN.

8. A User Equipment (UE) configured to perform access control, the UE comprising:
a transceiver; and
a processor configured to control the transceiver, wherein the processor is further configured to perform:
a process performing a registration procedure with an Access and mobility Management Function (AMF) of a Visited Public Land Mobile Network (V-PLMN),
wherein the registration procedure comprises receiving a registration accept message from the AMF of the V-PLMN, wherein the registration accept message includes i) Allowed Network Slice Selection Assistance Information (NSSAI) and ii) Mapping of the Allowed NSSAI which is information for mapping of each Single NSSAI (S-NSSAI) of the Allowed NSSAI to S-NSSAIs of a Home PLMN (H-PLMN);
a process for transmitting, to a Session Management Function (SMF) of the V-PLMN, a request message related to a Protocol Data Unit (PDU) session, wherein the request message includes i) an S-NSSAI from the Allowed NSSAI of a current access type, and ii) a corresponding S-NSSAI from the Mapping of the Allowed NSSAI;
a process for receiving, from the SMF of the V-PLMN, a reject message related to the PDU session, based on an S-NSSAI-based congestion control being applied for the S-NSSAI, wherein the reject message includes i) information on a backoff timer, ii) information informing the processor of either the H-PLMN or the V-PLMN associated with the S-NSSAI and iii) a cause value; and
a process for operating the backoff timer in association with the S-NSSAI and a process for performing the S-NSSAI-based congestion control for S-NSSAI while the backoff timer is running.

9. The UE of claim 8 , wherein the reject message further includes information on a Data Network Name (DNN).

10. The UE of claim 9 , wherein the backoff timer is operated in further association with the DNN, and the access control is performed in further consideration of the DNN.

11. The UE of claim 9 , wherein the processor is configured to receive a UE Route Selection Policy (URSP), wherein the URSP includes information on a target network of access control.

12. The UE of claim 11 , wherein the information indicates whether a target network node of the access S NSSAI-based congestion control is a SMF of the H-PLMN or the SMF of the V-PLMN.

13. The UE of claim 8 , wherein the reject message further includes H-PLMN or V-PLMN information.

14. The UE of claim 8 , wherein the reject message further includes information about whether a target network node of the S-NSSAI-based congestion control is a SMF of the H-PLMN or the SMF of the V-PLMN.

Assignees

• Lg Electronics Inc

Inventors

• Kim Jaehyun
• Youn Myungjune
• Park Sangmin
• Ryu Jinsook

Classifications

• H04W76/20

  Manipulation of established connections · CPC title

• H04W76/18

  Management of setup rejection or failure · CPC title

• H04W48/18 Primary

  Selecting a network or a communication service · CPC title

• H04W76/12 Primary

  Setup of transport tunnels · CPC title

• H04L47/125

  by balancing the load, e.g. traffic engineering · CPC title