IPv6 RS/RA Support in HR Roaming

In this release, the Home Routed roaming feature supports the mechanism for vSMF to receive the IPv6 interface ID from the hSMF using the N16 interface as per 3GPP TS 29.502, Release 16, CR 202206.

In the HR roaming scenario, the Router Solicitation (RA) and Router Advertisement (RA) is handled by the hUPF or hSMF, where the vUPF relays in both directions for RA to properly function. In CR 202206, the hSMF sends the IPv6 interface ID to the vSMF and then the vSMF relays the same to UE in the N1 payload.

For inter-operability, even if the vSMF does not receive the IPv6 interface ID from the hSMF on the N16 interface, it still relays based on the Virtual Mac configuration in the DNN profile to the UE.