Method and system for providing handoff between mobile communication network and wireless local area network, and switching device therefor

摘要

A method and system for providing a handoff between a mobile communication network including a mobile switching center (MSC) and a home location register (HLR), and a wireless local area network (WLAN) including an access point (AP) and a voice over Internet protocol (VoIP) gateway to provide a VoIP service. The HLR registers therein subscriber information for the MT including an Internet protocol (IP) address of the AP. The MT transmits a handoff request to the MSC if the MT connected to the mobile communication network has moved to a region of the WLAN. The HLR transmits the subscriber information to the VoIP gateway. The AP allocates an IP address and a channel for WLAN access by the MT, and sets a session for a VoIP service of the MT.