Patent ID: 10136370

Abstract:
Disclosed herein is a method and corresponding system for controlling operation of a user equipment device (UE) in a communication system comprising a first network and a second network interconnected with the first network. The UE may detect a public land mobile network identifier (PLMN ID) broadcast by a base station of the first network, where the base station does not support circuit switched fallback (CSFB) between the two networks The UE may determine, based on the detected PLMN ID, whether to operate in a first mode or a second mode, where (i) the first mode comprises, in response to the base station not supporting CSFB, the UE declining to be served by the base station and the UE instead being served directly by the second network and (ii) the second mode comprises the UE being served by the base station. The UE may then operate in the determined mode.