S8 Home Routing Call Flow
This section describes the S8 Home Routing call flow.
For the preparation phase, see 3GPP TS 23502, Release 15.4.0, section 4.11.1.2.2.2-1—EPS to 5GS (4G to 5G) handover using N26 interface.
The home-routed roaming scenarios support the following functionalities:
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H-PLMN supports the following nodes:
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PGW-C and SMF
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UPF and PGW-U
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AMF selects a default vSMF per PDU session, and invokes the Nsmf_PDUSession_CreateSMContext service operation with the following:
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UE PDN connection contexts
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AMF ID
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SMF
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PGW-C address
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S-NSSAI
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The S-NSSAI is configured for interworking and is associated with default vSMF.
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The default vSMF puts S-NSSAI in the N2 SM information container.
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AMF selects PGW-C and SMF through NRF from S8 FQDN (obtained from the MME).