Mobile communication system and its method for tunnel management

A mobile communication system and a method for tunnel management is provided to improve the efficiency and performance of a system by managing an allocated tunnel with a terminal ID during service connection or handoff. An attach request is transmitted to an ENB(Evolved Node B)(111) at a region where a UE(User Equipment)(100) is placed(S310). The ENB transmits the attach request to an MME(Mobility Management Entity)(121)(S320). The MME allocates a terminal ID to the UE(S330), and requests a tunnel setup to an sGW(serving Gateway)(122) for bearer setup(S340). A tunnel management table is generated(S350), and the sGW transmits a response message depending on the tunnel setup to the MME(S360). The MME transmits a response message of attach accept(S370). The ENB transmits an attach complete message to the MME(S380).