Network slice reselection
A WTRU ( 102 ) may receive updated assistance information for network slice selection and/or reselection ( 410 ). The WTRU may apply local policies to determine when to use the updated assistance information to access a network slice ( 440 ). The WTRU may determine whether to contact an existing network slice function ( 470 ) or a new network slice function ( 460 ) to establish a connection to a network slice. Based on the determination, the WTRU may transmit different information to the network. The network slice selection and/or reselection may be initiated by a WTRU or by a network.
1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
receiving a message from a network the WTRU is registered with, wherein the message comprises updated assistance information for access the network;
determining, based on the updated assistance information, that a set of network slices associated with the WTRU are to be modified;
updating network slice selection assistance information (NSSAI) based on the updated assistance information;
determining at least a portion of the updated NSSAI to be included in a registration message;
determining, based on the received message, that an immediate registration is needed; and
transmitting the registration message comprising at least the portion of the updated NSSAI.
2. The method of claim 1 , wherein the updated NSSAI identifies a type of service provided by at least one network slice of the set of network slices.
3. The method of claim 2 , wherein the type of service includes any of: an enhanced Mobile Broadband (eMBB) service, an ultra-reliable low latency communications (UR-LLC) service, and a massive Internet of Things (mIoT) service.
4. The method of claim 1 , further comprising waiting for a duration of a back-off timer before contacting an access and mobility management function (AMF) to establish a connection to a network slice of the set of network slices.
5. The method of claim 1 , wherein the updated assistance information comprises an indication to the WTRU to re-register with the network using the updated assistance information.
6. The method of claim 1 , further comprising:
transmitting an acknowledgement to the network upon receiving the updated assistance information.
7. The method of claim 1 , wherein updating the NSSAI comprises replacing current assistance information with the updated assistance information.
8. The method of claim 1 , wherein determining the immediate registration being needed comprises:
determining the updated assistance information to be used by the WTRU to connect, immediately after receiving the updated assistance information, to a network slice of the set of modified network slices.
9. The method of claim 1 , wherein determining at least the portion of the updated NSSAI to be included in the registration message comprises checking one or more policies to determine a type of the updated NSSAI to be included in the registration message.
10. The method of claim 9 , wherein the one or more policies include information regarding a list of one or more network slices that the WTRU is permitted to access.
11. The method of claim 1 , wherein the registration message is transmitted without a temporary identifier associated with an access and mobility management function (AMF) of the network.
12. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
receive a message from a network the WTRU is registered with, wherein the message comprises updated assistance information for access the network;
determine, based on the updated assistance information, that a first set of network slices associated with the WTRU are to be modified;
update network slice selection assistance information (NSSAI) based on the updated assistance information;
determine at least a portion of the updated NSSAI to be included in a registration message;
determine, based on the received message, that an immediate registration is needed; and
transmit the registration message comprising at least the portion of the updated NSSAI.
13. The WTRU of claim 11 , wherein the updated NSSAI identifies a type of service provided by at least one network slice of the set of network slices.
14. The WTRU of claim 12 , wherein the updated assistance information comprises an indication to the WTRU to re-register with the network using the updated assistance information.
15. The WTRU of claim 12 , wherein the processor is configured to transmit an acknowledgement to the network upon receiving the updated assistance information.
16. The WTRU of claim 12 , wherein the processor is configured to replace current assistance information with the updated assistance information.
17. The WTRU of claim 12 , wherein the processor is configured to determine the updated assistance information to be used by the WTRU to connect, immediately after receiving the updated assistance information, to a network slice of the set of modified network slices.
18. The WTRU of claim 12 , wherein the processor is configured to check one or more policies to determine a type of the updated NSSAI to be included in the registration message.
19. The WTRU of claim 18 , wherein the one or more policies include information regarding a list of one or more network slices that the WTRU is permitted to access.
20. The WTRU of claim 12 , wherein the registration message is transmitted without a temporary identifier associated with an access and mobility management function (AMF) of the network.