基于802.11e的无线多跳自适应合作式QoS算法  

Adaptive Cooperation Algorithm for QoS Guarantee in Multi-hop Transmission Based on 802.11e

作　　者：朱颖[1] 武穆清[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《电子学报》2010年第10期2350-2357,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60772109)

摘　　要：为解决Ad hoc网络中转发节点拥塞和低优先级业务增多而影响高优先级业务带宽的问题,提出了一种无线多跳网络服务质量保证框架WMHQ(Wireless Multiple Hop QoS)和自适应合作式信道接入算法QAC-EDCA(QoS guaranteed Adaptive Cooperation EDCA).算法将802.11e的优先级区分机制扩展成了三层优先级机制,通过将业务的服务质量需求映射成时隙利用率进行周期性的监测,并以控制帧捎带的方式在两跳范围内传播竞争窗口调整信息,使得高优先级业务具备剥夺低优先级业务带宽的能力和拥塞节点具有协调获取更多带宽的能力.仿真表明,该算法相对802.11e能更好地保护多跳情况下高优先级业务的服务质量.To avoid the transfer congestion and solve the problem of high priority throughput decreasing when low priority data stream increase in Ad hoc,a wireless multi-hop QoS framework and adaptive cooperation channel access algorithm named QAC-EDCA（QoS guaranteed Adaptive Cooperation EDCA） are proposed.QAC-EDCA base on 802.11e and expand its priority differentiation mechanism to three layer priority mechanism.Through mapping the QoS demand into slot utilization for QoS fulfill status judgement and broadcast contention window adjusting information in two hop area through control frame,the high priority stream can rob the bandwidth of low priority stream and the transfer congestion station can get more bandwidth from neighbor stations.Simulation proves that QAC-EDCA can protect high priority quality of service better than 802.11e in wireless multi-hop transmission surroundings.

关 键 词：自适应合作 AD HOC 802.11e 服务质量 时隙利用率 接收避免 优先级 

分 类 号：TN925.93[电子电信—通信与信息系统]