C.4 UE Procedures for Session Breakout

23.5483GPP5G System Enhancements for Edge ComputingRelease 17Stage 2TS

In the session breakout connectivity model, the selection of a new session breakout path does not result in a new network interface indication at the UE.

NOTE: In the case of multiple sessions or distributed anchor point connectivity models, when there is a change of network interface, indication of network interface change can and should be used to flush the UE OS DNS cache.

Session breakout results in a NAS SM message indicating the need to redo DNS lookup sent by the SMF to the UE modem. Thus, in order to support some solutions of this specification, it is necessary for the operating system to receive information of EAS rediscovery from the modem when such signalling has been received and clear the DNS cache in UE OS.