基于模糊算法的VoWLAN切换策略研究

Research on VoWLAN handoff strategy based on fuzzy algorithm

无线局域网承载下的VoIP(VoWLAN)的切换是由扫描、认证和重联接组成,但是扫描阶段占总时延的90%,所以降低扫描阶段的时延至关重要。为了获得更好的目标AP,本文对VoWLAN的切换策略进行改进,综合了信号强度、剩余带宽,接入用户数,通过模糊推理系统,找到最适合切换的目标AP。最后利用MATLAB进行仿真。结果是随着信号强度的增加,接入用户数的减少,剩余带宽的增加,目标AP切换的值越来越大。

The VoIP（VoWLAN） switch based on Wireless local area network（LAN） is connected by scanning,authentication and reconnection. but only the scanning that occupies 90% of the total delay time,so t is very important to reduce the scanning phase delay. In order to get a better target AP,this paper improves the switching strategy of Vo WLAN in the thesis. The most suitable target AP is found by the fuzzy inference system. The system combines the signal intensity,the residual bandwidth and the number of access users. Finally,the simulation is carried out by MATLAB. The result is that the access user is reduced with the increase of signal intensity and the value of the target AP switch is increased with the increase of remaining bandwidth.