Patent ID: 8270981
Filing Date: 2012-09-18
Classification: H04W

Abstract:
1. A method for a handoff of a portable terminal from a serving network to a target network, the serving network and the target network being heterogeneous networks having overlapping service areas, comprising: setting a reference strength corresponding to the serving network; verifying whether or not the strength of a first signal received from the target network is larger than the reference strength; installing software related to the target network in the portable terminal when the strength of the first signal is larger than the reference strength; determining whether or not the handoff to the target network is performed by inquiring a handoff policy registered in the portable terminal, including verifying whether or not the strength of a second signal received from the target network is larger than the reference strength; configuring a wireless connection environment with the target network by driving the software related to the target network and performing the handoff to the target network when the strength of the second signal is larger than the reference strength; and when the strength of the second signal is not larger than the reference strength, recalculating the average movement velocity in the predetermined time section.