一种参数动态可调的自适应WLAN间切换算法

An Adaptive Handoff Initiation Algorithm Between WLAN with Adjustable Dynamic Parameter

针对无线网络间切换普遍存在的乒乓运动和三方切换问题,提出一种新的基于反馈预测模型的自适应切换算法.在无线环境恶劣或移动节点处于网络交界处时,该切换算法在链路层切换判决阶段就采取措施避免频繁且不必要的切换,从根本上降低了乒乓运动和三方切换造成丢包的概率,减少了交互信令的浪费.另外,还通过预测判断在必要时发起预先切换,降低切换延时.本文最后经理论验证和仿真分析了算法的合理性和有效性.

This paper mainly focuses on ping-ponging and tri-side-handoff problems which are common in handoff between wireless networks, putting forward an adapted algorithm based on predictive feedback model. Under circumstances like SNR fluctuation or mobile node locating in the boundary of two network areas ,adapted algorithm take action on link-layer handoff decision phase in order to avoid frequent and unnecessary handoff, radically lowing packet-drop ratio due to ping-ponging and triside-handoff problems, as well as decrease signal exchange. Besides, handoff in advance by prediction can cut off delay. This paper at last proves the rationality and validity of the algorithm by theoretical analysis and simulation.