HANDOVER OF VOICE OVER NEW RADIO (VONR) TRIGGERED BY UNSUCCESSFUL VONR ATTEMPT

摘要

Aspects of the disclosure relate to ways to reduce time for an inter-RAT handover for a voice call. In particular, a user equipment (UE) determines that a voice call by the UE via a new radio (NR) base station has failed to be established within a defined time limit. The UE further determines whether information on a neighbor base station is available at the UE from a past handover event specified between the NR base station and the neighbor base station in response to determining that the voice call has failed to be established via the NR base station, where the neighbor base station may utilize a RAT different from a RAT of the NR base station. The UE further performs a process for providing a voice service via the neighbor base station in response to determining that the information on the neighbor base station is available.