US Patent No. 10,893,564

ABORTING AN EXTENDED SERVICE REQUEST PROCEDURE


Patent No. 10,893,564
Issue Date January 12, 2021
Title Aborting An Extended Service Request Procedure
Inventorship Shashanka Totadamane Ramappa, Shimoga (IN)
Parvez Sheikh, Calcutta (IN)
Assignee Apple Inc.

Claim of US Patent No. 10,893,564

1. A user equipment (UE), comprising:a radio; and
a processor coupled to the radio and a memory coupled to the processor, wherein instructions in the memory configure the processor to:
communicate with a packet-switched network;
initiate an extended service request procedure for a circuit-switched fallback to handle a voice call;
receive an indication of a Radio Access Technology (RAT) change from the packet-switched network during the extended service request procedure;
determine whether the voice call has been terminated prior to completion of the extended service request procedure; and
when the voice call has been terminated prior to completion of the extended service request procedure, abort the extended service request procedure, wherein aborting the extended service procedure includes ignoring the indication of the RAT change from the packet-switched network.