MOBILITY MANAGEMENT METHOD USING SIP AND SIP MOBILITY AGENT UNIT IN WIRELESS MOBILE COMMUNICATION NETWORK AND SYSTEM THEREOF - THE METHOD COMPRISES A STEP FOR MAINTAINING A CALL SET BY USING SIP PROTOCOL BY USING AN SMA UNIT WHEN A WIRELESS TERMINAL MOVED TO OTHER NETWORK, AND THEN REGISTERING A NEWLY ASSIGNED IP ADDRESS IN A POSITION SERVER

摘要

PURPOSE: A mobility management method using SIP(Session Initiation Protocol) and an SMA(SIP Mobility Agent) unit in a wireless mobile communication network is provided to manage mobility by introducing SIP and an SMA unit, to guarantee a continuous mobility during a handoff of a mobile station, without resetting a call when entering an outer network, thereby overcoming inefficiency. CONSTITUTION: An MN(Mobile Node) is assigned with an IP address in a network. The MN registers the assigned IP address in a position server of the network. A call is set by using SIP between the MN and a predetermined communication node. When the MN moves to other network, the set call is maintained by using an SMA unit, while a newly assigned IP address is registered in the position server. The network uses a fixed IP version 4 or a dynamic IP version or a fixed IP version 6.