Mobility Restriction IEs
Mobility Restrictions are included in the AMF when:
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Restrictions are applicable to a UE and the registration type isn’t Emergency Registration.
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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:
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Downlink NAS Transport
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Handover Request
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Initial Context Setup Request (ICSR)
Note | The AMF supports only the serving PLMN. |
Downlink NAS Transport
The AMF performs the following activities:
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NG-RAN with a Mobility Restriction List having the last E-UTRAN PLMN Identity and the Return preferred indication.
NoteThe 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:
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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.
NoteThe Mobility Restriction List contains the PLMN IDs as specified in TS 23.501, "System architecture for the 5G System (5GS)"
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The AMF sends the Handover Request from the T-AMF (Target AMF) to the T-RAN (Target RAN) with the following parameters:
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Source to Target transparent container
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N2 MM Information
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N2 SM Information list
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Tracing Requirements
If the target AMF has the Mobility Restriction List, the same list is sent in N2 MM Information.
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The AMF sends N2 MM Information from AMF to RAN with the following parameters:
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Security context
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Mobility Restriction List
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List of recommended cells
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Tracing Area
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NG-RAN node identifiers
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Initial Context Setup Request (ICSR)
During Service Request and PDU establishment, the AMF sends the ICSR IE.