4.6.3.7 Session management aspect of handling network slices with NS-AoS not matching deployed tracking areas

If a UE is outside the NS-AoS of an S-NSSAI for which a PDU session is established (see clause 4.6.2.10), the UE shall not:

• attempt to request the establishment of user plane resources of any PDU session associated with this S-NSSAI; and
• initiate the UE-initiated NAS transport procedure to send CIoT user data to the SMF (see clause 5.4.5.2.1 case h) nor the service request procedure to send CIoT user data to the SMF (see clause 5.6.1.1 case d) for the established PDU session.

If a UE is outside the NS-AoS of an S-NSSAI for which a PDU session is established (see clause 4.6.2.10), the SMF shall not:

• attempt to establish user plane resources of any PDU session associated with this S-NSSAI; and
• initiate the network-initiated NAS transport procedure to send CIoT user data to the UE (see clause 5.4.5.3.1 case l).

If a UE is outside the NS-AoS of an S-NSSAI for which a PDU session is established (see clause 4.6.2.10), the UE shall not initiate for this PDU session any UE-requested 5GSM procedure except:

• the UE-requested PDU session release procedure; or
• the UE-requested PDU session modification procedure to set the 3GPP PS data off status to "deactivated" as specified in 3GPP TS 24.008 [13].

NOTE: A PDU session associated with an S-NSSAI is not released solely because a UE is outside the NS-AoS of the S-NSSAI.

If a UE is outside the NS-AoS of an S-NSSAI (see clause 4.6.2.10), the UE shall not initiate the UE-requested PDU session establishment procedure for this S-NSSAI.

If the SMF cannot determine that the UE is located inside the NS-AoS of the S-NSSAI of an existing PDU session established for this S-NSSAI, the SMF may according to operator's policy:

• attempt to establish the user plane resources for this PDU session; or
• initiate the network-initiated NAS transport procedure to send CIoT user data to the UE for this PDU session (see clause 5.4.5.3.1 case l).

If the SMF determines that:

• the UE is located inside the NS-AoS of the S-NSSAI of an existing always-on PDU session;
• the UE is in 5GMM-CONNECTED mode; and
• the user plane resources for the always-on PDU session are not established,

the SMF shall attempt to establish the user plane resources for the always-on PDU session associated with the S-NSSAI with S-NSSAI location validity information.