Behavior Change

Previous Behavior: During 5G to Wi-Fi handover, SMF sent the following messages:

  • N1 PDU Session Release command to UE without Skip-Indication flag in N1N2Transfer message

  • N2 Resource Release Command Transfer message to gNB

  • SmContextStatusNotify message to AMF

New Behaviour: The SMF now supports June 2019 compliance of 3GPP TS 23.502, Release 15.4.1. For 5G to Wi-Fi handover, the SMF sends the following messages:

  • N2 Resource Release Command Transfer message if the user plane tunnel is active.

  • N1 PDU Session Release command if the following configuration is NOT configured:

    config 
       profile compliance compliance_profile_name 
          service threegpp23502 
             version uri v1 
             version full 1.0.2 
             version spec 15.6.0 
             exit 

    When N1 is sent, SMF includes Skip-Indication flag in N1N2Transfer message based on configuration under dnn-profile.

  • SmContextStatus Notify message to AMF only in the following cases:

    • When the SMF does not send N1N2Transfer message and if the following configuration exists:

      config 
         profile compliance compliance_profile_name 
            service threegpp23502 
               version uri v1 
               version full 1.0.2 
               version spec 15.6.0 
               exit 
    • When SMF sends N1N2Transfer message and AMF responds with status code other than 4xx.