Patent ID: 8942663
Filing Date: 2015-01-27
Classification: H04L,H04W

Abstract:
1. A method for a User Equipment (UE) to support emergency communications with a Radio Access Network (RAN) serving at least one Core Network (CN), the method comprising: receiving an emergency call support indication from the RAN indicating whether emergency communication is supported in at least one CN; determining if emergency communication is supported in any of the at least one CN based on the received emergency call support indication; determining if emergency communication needs to be established; and if it is determined that emergency communication is supported in any of the at least one CN of the shared network environment and also if it is determined that emergency communication needs to be established, transmitting a request for emergency communication to the RAN, wherein the emergency call support indication is received via broadcast channel if the UE is in a limited service state, and wherein the emergency call support indication is received while performing an Attach procedure if the UE camps normally on a cell, and wherein, when the UE is connected via the RAN to a CN that does not support emergency communication and when emergency communication needs to be established, terminating the connection via the RAN to the CN that does not support emergency communication and transmitting a request for emergency communication to the RAN.