Adaptive vertical handoff method based on the RSS trend of a kind of wireless network technology, by setting the current service network switching threshold, set the threshold for each candidate switching network; received signal strength and measuring the current service network and all the candidate network and the current value of the service network round-trip delay value after normalization to generate the signal intensity and time delay sequence sequence; then the signal strength sequence and time delay sequence respectively after averaging all the network to update the network evaluation value, and the switching threshold and the switching threshold is optimized, the realization of adaptive vertical handoff. The invention uses the linear weighting method to evaluate the heterogeneous network, and simultaneously adjusts the handover decision threshold adaptively according to the changing tendency of the received signal strength, and realizes fast and accurate vertical switching.
【技术实现步骤摘要】
【技术保护点】
１．一种基于ＲＳＳ变化趋势的自适应垂直切换方法，其特征在于，包括如下步骤：步骤一，为当前服务网络设置切换触发阈值，为各个候选网络设置切换执行阈值；步骤二，测量当前服务网络和候选网络的接收信号强度值以及当前服务网络的往返时延值，经归一化处理后生成信号强度序列和时延序列；步骤三，对信号强度序列和时延序列分别求平均值后更新当前服务网络和候选网络的网络评价值，并对切换触发阈值和切换执行阈值进行优化，实现自适应垂直切换。
【技术特征摘要】
【专利技术属性】
技术研发人员：张丽丽，刘大鹏，徐昌庆，杨帆，
申请(专利权)人：上海交通大学，
类型：发明
国别省市：31
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