Patent ID: 8175599

Claim:
A method for controlling a mobile terminal in a network system, wherein the mobile terminal performs a handover from a first network to a second network during data transmission and/or reception through an existing data transmission tunnel between a router and an access point within the first network, comprising: selectively transmitting to a server a message, during employment of the existing data transmission tunnel, requesting a bandwidth change of the data transmission and/or reception to a transmission bandwidth supported by the second network after performing the handover; selectively delaying transceiving of data through a new data transmission tunnel, built upon the handover being performed and providing an existing connection between the router and an access point within the second network, until after a message acknowledging a changing of the transmission bandwidth of the data transmission and/or reception, based on the transmitted message requesting the bandwidth change, is transmitted from the server to the router within the existing data transmission tunnel; and tranceiving the data through the new data transmission tunnel based upon the selective delaying of the tranceiving of the data through the new data transmission tunnel.