Patent ID: 8744445

Claim:
A method of handling handover message decoding for a mobile device in a wireless communication system, the method comprising: via a first radio access technology (RAT), receiving a handover message associated with a handover from the first RAT to a second RAT supporting services of a packet switched (PS) domain and a circuit switched (CS) domain, wherein the handover message comprises type information and an inter-RAT message generated based on the second RAT; determining a switched domain type of the inter-RAT message according to the type information, wherein the inter-RAT message is determined to be a PS-type message when the type information includes PS (Radio Bearer) RAB information, irrespective of including CS RAB information or not; decoding the inter-RAT message according to the determination result; performing the handover according to the decoded inter-RAT message; utilizing a CS-type message decoder to decode the inter-RAT message when the inter-RAT message is determined to be a CS-type message; and utilizing a PS-type message decoder to decode the inter-RAT message when the inter-RAT message is determined to be a PS-type message.