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Communication method, user equipment and communication device

The embodiment of the invention provides a communication method, user equipment (UE) and a communication device of the user equipment. According to the method, an IMS (IP multimedia subsystem) can perceive that the UE is switched, so that subsequent charging and called domain routing is facilitated. In one embodiment, the UE initiates a re-registration process after finishing switching between WiFi and LTE (Long Term Evolution), and carries UE switching related information to an application server in the IMS through a registration request; in another embodiment, after the UE finishes switching between WiFi and LTE, a P-CSCF (Proxy-Call Session Control Function) perceives that the UE is switched according to an IP-CAN (IP-Connectivity Access Network) conversation process, an IP-CAN change event, an RAT- change event or the like, and the P-CSCF notifies the switching information of the UE to the application server in the IMS through a NOTIFY request, a MESSAGE request, an INFO request, an INVITE request and the like.