WLAN中基于混合模式的接纳控制算法

Mixed-mode-based admission control in WLAN

针对WLAN标准IEEE802.11e中EDCA不能提供定量的服务质量(QoS)的问题,提出了一种混合模式(基于模型和测量)的接纳控制算法。通过建立退避实例的各个状态转移的Markov模型,利用贝塞尔削减规则得出网络性能指标的解析表达式,并根据测量的信道的实时状况预测新业务流可获得的吞吐量,最后提出了一种基于吞吐量的接纳控制算法。实验结果表明,该算法保证了已经接入业务流的服务质量,同时接纳了更多的新业务流,提高了网络的吞吐量。

A mixed-mode （model and measurement）-based admission control algorithm was proposed concerning that IEEE 802.11e EDCA cannot offer quantitative QoS.States transition Markov models of back-off instance were proposed,the analytical expression of network performance indicators could be obtained through Beizer reduction rules,and the achievable throughputs of the new arrived flows were predicted according to measured channel states.Finally admission control algorithm based on throughput was proposed.This scheme shows a good protection of admitted flows and admits more flows,while increasing the throughput of the network.