METHOD OF VERTICAL HANDOFF

摘要

A vertical handoff method is provided to prevent degradation of performance due to an increase in a delay time of vertical handoff, degradation of data throughput, degradation of terminal battery efficiency, and an increase in probability of a failure of vertical handoff. A serving network of a terminal is determined(S110). When the serving network is the first network and an RSSI(Received Signal Strength Indication) received from the second network is greater than the first threshold value, it is determined whether to perform the first vertical handoff by using a result obtained by estimating a transition pattern of the RSSI(S103,S105,S107,S109). When the serving network is the second network and the RSSI received from the second network is smaller than the second threshold value, it is determined whether to perform the second vertical handoff by using a result obtained by estimating a transition pattern of the RSSI(S111,S113,S115,S117,S119).