Method for determining transmission of CIOT user data in relation to S-NSSAI

A user equipment (UE), the UE comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
• receiving a registration accept message including a validity time for at least one Single Network Slice Selection Assistance Information (S-NSSAI);
• establishing at least one PDU (protocol data unit) session associated with the at least one S-NSSAI, when the at least one S-NSSAI is included in an Allowed NSSAI or in a Partially Allowed NSSAI;
• and
• when the UE is outside a Network Slice Area of Service (NS-AoS) of the at least one S-NSSAI, initiating a UE-initiated Non-Access Stratum (NAS) transport procedure carrying one of a PDU session release request message and PDU session modification request message to set a Packet Switching (PS) data off status to “deactivated”, instead of initiating a UE-initiated NAS transport procedure for sending a Cellular Internet of Things (CIoT) user data as well as a service request procedure for sending the CIoT user data,
• wherein when the at least one PDU session is established for the at least one S-NSSAI included in the partially allowed NSSAI and when a current tracking area identifier (TAI) is not in a list of tracking areas (TAs) for which the at least one S-NSSAI is allowed, the UE maintains contexts for the at least one established PDU session and initiates one of a UE-requested PDU session release procedure or a UE-requested PDU session modification procedure to set the PS data off status to “deactivated”, instead of initiating the UE-initiated NAS transport procedure for sending the CIoT user data as well as the service request procedure for sending the CIoT user data, and
• wherein when the validity time indicates the at least one S-NSSAI is not available, and when the at least one S-NSSAI is already part of the Allowed NSSAI or Partially Allowed NSSAI, the UE removes the at least one S-NSSAI from a locally stored Allowed NSSAI or Partially Allowed NSSAI and the UE also locally releases any PDU sessions associated with the at least one S-NSSAI.

A semiconductor chipset equipped into a user equipment (UE), comprising:

• at least one processor;
• and
• at least one memory capable of storing instructions and being connected electrically to the at least one processor operably,
• wherein an operation, performed when the instructions are executed by the at least one processor, includes:
• receiving a registration accept message including a validity time for at least one Single Network Slice Selection Assistance Information (S-NSSAI);
• establishing at least one PDU (protocol data unit) session associated with the at least one S-NSSAI, when the at least one S-NSSAI is included in an Allowed NSSAI or in a Partially Allowed NSSAI;
• and
• when the UE is outside a Network Slice Area of Service (NS-AoS) of the at least one S-NSSAI, initiating a UE-initiated Non-Access Stratum (NAS) transport procedure carrying one of a PDU session release request message and PDU session modification request message to set a Packet Switching (PS) data off status to “deactivated”, instead of initiating a UE-initiated NAS transport procedure for sending a Cellular Internet of Things (CIoT) user data as well as a service request procedure for sending the CIoT user data,
• wherein when the at least one PDU session is established for the at least one S-NSSAI included in the partially allowed NSSAI and when a current tracking area identifier (TAI) is not in a list of tracking areas (TAs) for which the at least one S-NSSAI is allowed, the at least one processor maintains contexts for the at least one established PDU session and initiates one of a UE-requested PDU session release procedure or a UE-requested PDU session modification procedure to set the PS data off status to “deactivated”, instead of initiating the UE-initiated NAS transport procedure for sending the CIoT user data nor the service request procedure for sending the CIoT user data, and
• wherein when the validity time indicates the at least one S-NSSAI is not available, and when the at least one S-NSSAI is already part of the Allowed NSSAI or Partially Allowed NSSAI, the UE removes the at least one S-NSSAI from a locally stored Allowed NSSAI or Partially Allowed NSSAI and the UE also locally releases any PDU sessions associated with the at least one S-NSSAI.