Mobility Restriction IEs

Mobility Restrictions are included in the AMF when:

  • Restrictions are applicable to a UE and the registration type isn’t Emergency Registration.

  • Emergency Registration is sent in Downlink NAS Transport with the message type as Registration Accept.

Note

This procedure as specified in TS 23.502, "Procedures for the 5G System (5GS)."

The AMF encodes the following mobility restrictions IEs:

  • Downlink NAS Transport

  • Handover Request

  • Initial Context Setup Request (ICSR)

Note

The AMF supports only the serving PLMN.

Downlink NAS Transport

The AMF performs the following activities:

  • NG-RAN with a Mobility Restriction List having the last E-UTRAN PLMN Identity and the Return preferred indication.

    Note

    The Mobility Restriction List contains a list of PLMN IDs as specified in TS 23.501, "System architecture for the 5G System (5GS)."

Handover Request

The AMF performs the following activities:

  • The AMF sends a Handover Request with a Mobility Restriction List to the NG-RAN.

    The AMF provides the NG-RAN with a PLMN list in the Mobility Restriction List containing the serving PLMN and the last E-UTRAN PLMN Identity.

    Note

    The Mobility Restriction List contains the PLMN IDs as specified in TS 23.501, "System architecture for the 5G System (5GS)"

  • The AMF sends the Handover Request from the T-AMF (Target AMF) to the T-RAN (Target RAN) with the following parameters:

    • Source to Target transparent container

    • N2 MM Information

    • N2 SM Information list

    • Tracing Requirements

    If the target AMF has the Mobility Restriction List, the same list is sent in N2 MM Information.

  • The AMF sends N2 MM Information from AMF to RAN with the following parameters:

    • Security context

    • Mobility Restriction List

    • List of recommended cells

    • Tracing Area

    • NG-RAN node identifiers

Initial Context Setup Request (ICSR)

During Service Request and PDU establishment, the AMF sends the ICSR IE.