Patent ID: 9723649
Date: 2017-08-01
CPC Classifications: H04W

Claim:
1. A method of improving availability of a circuit switched (CS) service, the method comprising steps of: establishing a packet switched (PS) signaling connection between a user equipment (UE) and a core network (CN); sending, by the UE, at least one location area update (LAU) message, to the CN, to initiate an LAU procedure; detecting a release of a CS signaling connection between the UE and the CN due to a failure in the LAU procedure; identifying the ongoing PS signaling connection between the UE and the CN, when the CS signaling connection between the UE and the CN is released; sending, by the UE, a request to the CN for releasing the ongoing PS signaling connection; and receiving, by the UE, an indication from the CN indicating release of the ongoing PS signaling connection; and when the indication of the release of the ongoing PS signaling connection is received: