基于信道时间分类的接纳控制方案

为了解决现有接纳控制方案存在的对新数据流进入网络后的信道使用情况预测不够准确的问题,对IEEE 802.11e无线局域网的增强分布式信道访问(EDCA)模式下无线信道的各种状态进行分类,确定真正可利用的信道空闲时间,将新数据流带来的额外信道开销细分为退避时间、传输时间和碰撞时间,并给出每类时间开销的预测方法,从而为接纳控制方案提供更准确的判断依据。仿真试验证明,所提出的方案能做出更合理的接纳控制决策,并且具有更好的适应性。

Admission control scheme based on channel time classifications

A common shortcoming of existing enhanced distributed channel access(EDCA) admission control schemes in IEEE 802.11e wireless local area networks is that the prediction of the channel usage condition after a new flow joins the network is not accurate enough.This paper describes an algorithm to classify the various states of the EDCA wireless channel to determine the actual available channel idle time.The algorithm then divides the additional channel time required by the new flow into the backoff time,the transmission time and the collision time to predict the changes in these three times to provide more accurate information for the admission control scheme.Simulation results verify that the scheme makes more reasonable admission decisions and is more flexible.