Feature Description

The SMF supports the Xn-based and N2-based handover procedures to hand over a UE from a source NG-RAN node to a target NG-RAN node using the Xn or N2 reference points. Initiation of this procedure can be due to new radio conditions, load balancing or due to a specific service.

The SMF releases the QoS flows that failed to set up on the target NG-RAN during Xn and N2 handovers on the respective interfaces N4 (UPF) and N1 (UE). The SMF sends appropriate notification to N7 (PCF) based on the triggers if armed. The SMF also sends the usage report to N40 (CHF) for the released QoS flows.