Feature Description

Important

The PGW-C term used in this chapter denote the EPS interworking functionality supported by SMF and must not be assumed as a standalone P-GW that is used in the LTE network.

The SMF+PGW-C product supports Wi-Fi handovers. The cloud-based architecture supports the following Wi-Fi handovers in 5GS or EPS and non-3GPP untrusted access.

  • EPC to non-3GPP untrusted Wi-Fi handover

  • Non-3GPP untrusted Wi-Fi to EPC handover

  • Non-3GPP untrusted Wi-Fi to 5GS handover with EPS fallback

  • Non-3GPP untrusted Wi-Fi to 5GS handover

  • 5GS to non-3GPP untrusted Wi-Fi handover

Handover Indication Support

The SMF+IWF rejects the Create Session Request received with handover (HO) indication even if the session does not exist. This support is applicable only to the 4G and Wi-Fi sessions.

The gtpc message-handling create-session-request ho-ind new-call-reject CLI command under access profile rejects the call with "Context Not Found".

For more information, see the Configuring Calls with Handover Indication section.

Alternate RAT Tunnel Creation for Wi-Fi

SMF creates an alternate RAT tunnel during the Wi-Fi attach procedure. This tunnel is reused when a subscriber moves to another RAT during handover.

Note

Creation of an alternate RAT tunnel is prerequisite for the inter-PLMN handover support.