TECHNIQUES FOR SESSION MANAGEMENT SIGNALING FOR PARTIAL NETWORK SLICE SUPPORT IN A REGISTRATION AREA
Various aspects of the present disclosure relate to techniques for session management signaling for partial network slice support in a registration area. An apparatus is configured to receive a first session management (SM) message for a protocol data unit (PDU) session associated with a network slice and a user equipment (UE), determine that the network slice is not supported or not available in a location area of the UE, and transmit a second SM message and an indication that the network slice is not supported or not available in the location area of the UE.
1 . A network entity (NE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
receive a first session management (SM) message for a protocol data unit (PDU) session associated with a network slice and a user equipment (UE);
determine that the network slice is not supported or not available in a location area of the UE; and
transmit a second SM message and an indication that the network slice is not supported or not available in the location area of the UE.
2 . The NE of claim 1 , wherein:
the first SM message is an N1 SM message that is received from the UE and encapsulated in an uplink non-access stratum (NAS) transport message.
3 . The NE of claim 2 , wherein:
the second SM message is transmitted to a session management function (SMF) and encapsulated in a PDU session update request message.
4 . The NE of claim 1 , wherein:
the second SM message is an N2 SM message that is intended for an access network (AN).
5 . The NE of claim 4 , wherein:
the at least one processor is configured to cause the NE to refrain from delivering the N2 SM message to the AN in response to determining that the network slice is not supported or not available in the location area of the UE.
6 . The NE of claim 5 , wherein:
the at least one processor is configured to cause the NE to indicate to a sender of the first SM message that the N2 SM message was not delivered to the AN because the network slice is not supported or not available in the location area of the UE.
7 . The NE of claim 1 , wherein:
the NE comprises an Access and Mobility Management Function (AMF).
8 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
receive a first session management (SM) message for a protocol data unit (PDU) session associated with a network slice and a user equipment (UE);
determine that the network slice is not supported or not available in a location area of the UE; and
transmit a second SM message and an indication that the network slice is not supported or not available in the location area of the UE.
9 . The processor of claim 8 , wherein:
the first SM message is an N1 SM message that is received from the UE and encapsulated in an uplink non-access stratum (NAS) transport message.
10 . The processor of claim 9 , wherein:
the second SM message is transmitted to a session management function (SMF) and encapsulated in a PDU session update request message.
11 . The processor of claim 8 , wherein:
the second SM message is an N2 SM message that is intended for an access network (AN).
12 . The processor of claim 11 , wherein:
the at least one controller is configured to cause the processor to refrain from delivering the N2 SM message to the AN in response to determining that the network slice is not supported or not available in the location area of the UE.
13 . The processor of claim 12 , wherein:
the at least one controller is configured to cause the processor to indicate to a sender of the first SM message that the N2 SM message was not delivered to the AN because the network slice is not supported or not available in the location area of the UE.
14 . The processor of claim 8 , wherein:
the processor comprises an Access and Mobility Management Function (AMF).
15 . A method performed by a network function, the method comprising:
receiving a first session management (SM) message for a protocol data unit (PDU) session associated with a network slice and a user equipment (UE);
determining that the network slice is not supported or not available in a location area of the UE; and
transmitting a second SM message and an indication that the network slice is not supported or not available in the location area of the UE.
16 . The method of claim 15 , wherein:
the first SM message is an N1 SM message that is received from the UE and encapsulated in an uplink non-access stratum (NAS) transport message.
17 . The method of claim 16 , wherein:
the second SM message is transmitted to a session management function (SMF) and encapsulated in a PDU session update request message.
18 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
transmit signaling for a session management (SM) procedure for an established protocol data unit (PDU) session associated with a network slice, wherein the network slice is not supported or not available in a location area of the UE;
receive a non-access stratum (NAS) SM message as part of the SM procedure for the PDU session; and
perform an action according to the NAS SM message without initiating activation of user plane resources for the PDU session.
19 . The UE of claim 18 , wherein:
the at least one processor is configured to cause the UE to proceed with the SM procedure for the PDU session even though the UE is located in an area where single network slice selection assistance information (S-NSSAI) is not supported or not available.
20 . The UE of claim 19 , wherein:
the at least one processor is configured to cause the UE to transmit the signaling to a session management function (SMF) as part of the PDU session even though the UE is located in an area where S-NSSAI is not supported or not available.