Network slice configuration update

1. A network slice configuration update method, the method being performed by a user equipment (UE) having subscription information, and the method comprising:

the UE receiving a configuration update command transmitted by a management function within a current Public Land Mobile Network (PLMN), the configuration update command comprising a parameter indicating that a network slicing subscription change has occurred;

after receiving the configuration update command, the UE initiating a registration procedure; and

after receiving the configuration update command, the UE erasing a network slicing configuration for a non-current PLMN that is different than the current PLMN.

2. The method of claim 1 , further comprising:

the UE sending to a network function within the PLMN a notification indicating that the network function should provide to the UE a set of network slice identifiers for the PLMN.

3. The method of claim 2 , further comprising, after receiving the configuration update command and prior to initiating the registration procedure, the UE setting a particular flag, wherein

the UE sends to the network function within the PLMN the notification as a result of determining that the particular flag is set to the certain value.

4. The method of claim 1 , wherein

the configuration update command further comprises: Configured NSSAI for the PLMN, and/or Allowed NSSAI, and

the management function is an Access and Mobility Management Function (AMF).

5. A non-transitory computer readable medium storing a computer program for configuring a UE to perform the method of claim 1 .

6. A network slice configuration update method, the method being performed by a user equipment (UE) having subscription information, and the method comprising:

the UE receiving a message transmitted by a management function within a current Public Land Mobile Network (PLMN), the message comprising: i) a network slicing indicator indicating that a network slicing subscription change has occurred and ii) network slicing information for the current PLMN;

after receiving the message, the UE updating a configuration for the current PLMN based on the network slicing information; and

in response to receiving the message comprising the network slicing indicator indicating that a network slicing subscription change has occurred, the UE erasing a network slicing configuration for a non-current PLMN that is different than the current PLMN.

7. The method of claim 6 , further comprising:

the UE, prior to receiving the message, transmitting a registration request message for registering with the PLMN, wherein

the message received from the management function is a registration accept message responsive to the registration request message.

8. The method of claim 6 , wherein the message is a configuration update command message.

9. The method of claim 6 , wherein

the network slicing information included in the message comprises: Configured NSSAI for the PLMN, and/or Allowed NSSAI, and

the management function is an Access and Mobility Management Function (AMF).

10. A non-transitory computer readable medium storing a computer program for configuring a UE to perform the method of claim 6 .

11. A user equipment (UE), comprising:

a receiver for receiving a configuration update command transmitted by a management function within a current Public Land Mobile Network (PLMN); and

a processor, wherein the UE is configured to:

determine whether the configuration update command comprises a parameter indicating that a network slicing subscription change has occurred;

after determining that the configuration update command comprises a parameter indicating that a network slicing subscription change has occurred, initiate a registration procedure; and

after receiving the configuration update command, erase a network slicing configuration for a non-current PLMN that is different than the current PLMN.

12. The UE of claim 11 , wherein

the configuration update command further comprises: Configured NSSAI for the PLMN, and/or Allowed NSSAI, and

the management function is an Access and Mobility Management Function (AMF).

13. A user equipment (UE), the UE comprising:

a receiver for receiving a message transmitted by a management function within a current Public Land Mobile Network (PLMN); and

processing circuitry, wherein the UE is configured to:

determine whether the message comprises i) a network slicing indicator indicating that a network slicing subscription change has occurred and ii) network slicing information for the current PLMN;

after determining that the message comprises i) a network slicing indicator indicating that a network slicing subscription change has occurred and ii) network slicing information for the current PLMN, update a configuration for the current PLMN based on the network slicing information; and

erase a network slicing configuration for a non-current PLMN that is different than the current PLMN as a result of determining that the message comprises the network slicing indicator indicating that the network slicing subscription change has occurred.

14. The UE of claim 13 , further being configured to:

transmit a registration request message for registering with the PLMN, wherein

the message received from the management function is a registration accept message responsive to the registration request message.

15. The UE of claim 13 , wherein the message is a configuration update command message.

16. The UE of claim 13 , wherein

the network slicing information included in the message comprises: Configured NSSAI for the PLMN and/or Allowed NSSAI, and

the management function is an Access and Mobility Management Function (AMF).