| CPC H04W 12/06 (2013.01) [H04W 76/30 (2018.02); H04W 84/042 (2013.01)] | 6 Claims |
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1. A first communication apparatus comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a second communication apparatus, a first message indicating a failure of authentication of a first Single-Network Slice Selection Assistance Information (S-NSSAI) for a user equipment in a re-authentication and re-authorization;
send, to a third communication apparatus, a second message requesting to release a Protocol Data Unit (PDU) session in a case where the at least one processor receives the first message; and,
send, to the UE, a Non-Access Stratum (NAS) message for instructing an update of a UE configuration after the at least one processor receives the first message,
wherein the second message includes a cause information element indicating the failure of the authentication in the re-authentication and re-authorization,
wherein the PDU session is associated with the first S-NSSAI, and
wherein the NAS message indicates that the first S-NSSAI is included in a Rejected Network Slice Selection Assistance Information (NSSAI).
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