Limitations and Restrictions

During inter-plmn mobility, H-SMF or SMF has the following limitations:

  • Does not reselect operator policy and the UPF.

  • Northbound NF selection criteria do not change.

  • Changes roaming status from/to homer/roamer

During inter-plmn mobility, V-SMF has the following limitations:

  • Selects operator policy based on the subscriber policy configuration

  • V-UPF and V-CHF are selected based on configuration.

  • Roaming-status configured under the Operator policy is used to override the HRT roaming request to treat the UE as LBO.

Restrictions

SMF has the following restrictions:

  • Intra-PLMN mobility where UE moves from one V-SMF to another in V-PLMN, V-SMF change is not supported.

  • IDFT is not supported for Inter-plmn HO.

  • If the inter-plmn CLI is not configured, ModifyBearerRequest with visitor PLMN is rejected.

  • For inter-plmn scenarios, the Roaming QOS flow based charging profile configured in the H-SMF is given priority and the one received from the V-SMF is ignored.