Adaptive Vertical Handoff Decision Algorithm for Wireless Heterogeneous Networks

In heterogeneous environments,vertical handoff among the networks has a major impact on QoS(Quality of service).However,mobile terminal switching performance between heterogeneous networks is not ideal.This paper proposes an adaptive vertical handoff decision algorithm.This algorithm considers the current battery level of terminal,uses cost function based on user applications,chooses and evaluate access network,and determines whether current business needs switching.Simulation results show that the proposed algorithm can effectively prolong the working time of the terminal,reduce the ping-pong effect,and improve switching performance and business service quality.