Patent ID: 8666415

Claim:
A method for canceling a call initiation in radio access technology, hereafter called RAT, change for a mobile device, the method comprising: initiating a circuit-switched (CS) fallback call in a first RAT by sending a non access stratum (NAS) extended service request; receiving a command redirecting the mobile device to a second RAT; and canceling the CS fallback call in response to a request received from a user interface by aborting a connection establishment to the second RAT before establishing a connection to the second RAT when the mobile device is moving from the first RAT to the second RAT in response to the command; wherein the first RAT is long-term evolution (LTE), the connection is a radio resource control (RRC) connection or a signaling connection for CS domain, and the command is an inter-RAT cell change order or a RRC connection release.