Ultra Cloud Core 5G Access and Mobility Management Function, Release 2023.02 - Configuration and Administration Guide - Low Mobility Handover (Xn/N2) [Cisco Ultra Cloud Core - Access and Mobility Management Function]

Feature Summary and Revision History

Table 1. Summary Data
Applicable Product(s) or Functional Area	AMF
Applicable Platform(s)	SMI
Feature Default Setting	Enabled - Always-on
Related Documentation	Not Applicable

Table 2. Revision History
Revision Details	Release
First introduced.	2022.01.0

The low mobility handover feature supports the following functions:

AMF doesn't support the following:

This section describes how this feature works.

This section describes the key call flows for this feature.

This section describes the N2 Handover cancel call flow.

The source NG-RAN sends the Handover Cancel Request to the source AMF, before sending the Handover command to the UE.

It sends this request when it observes the following:

The Handover Cancel Request releases the handover reserved resources in the target system.

Table 3. N2 Handover Cancel Call Flow Description
Step	Description
1	The S-gNB (source gNB) sends the Handover Cancel to the S-AMF (source AMF).
2	The S-AMF sends the Namf_Comm_ReleaseReq to the T-AMF (target AMF).
3, 4	The T-AMF sends the UE Context Release Command to the T-gNB (target gNB) and receives the UE Context Release Complete.
5	The T-AMF sends the Relocation Cancel Indication (Nsmf_Update_Req) to the SMF.
6	The SMF sends Nsmf_update_Rsp to the T-AMF.
7	The S-AMF receives Namf_Comm_ReleaseRsp from the T-AMF.
8	The S-AMF sends Handover Cancel ACK to the S-gNB.