Homer Calls with N3 and N9 Separation
Following call flow process change happens in the Home routed calls.
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vSMF Create Session Procedure: During the 5G session creation procedure, SMF includes source interface type IE (3GPP interface type) in the PDI IE in N4 messages while creating a PDR with an appropriate interface type. For example, SMF includes source interface type= N3 3GPP Access in the Create uplink PDR in N4 messages and UPF allocates TEID from that interface based on the configuration. If no GTPU service is associated to N3 3GPP Access, then TEID is allocated from default (one without interface configuration).
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4G Access Registration: At the time of 4G access registration, SMF includes source interface type= S5-U in the Create uplink PDR in N4 messages and UPF allocates TEID from that interface based on the configuration. If no GTPU service is associated to S5-U, then TEID is allocated from default (one without interface configuration.