一种流量预测的服务质量区分MAC退避算法  

Backoff algorithm of MAC protocol with flow predicted and quality of service distinguished

作　　者：苏海武[1] 程良伦[1] 

机构地区：[1]广东工业大学自动化学院,广州510006

出　　处：《计算机应用研究》2013年第10期3091-3095,共5页Application Research of Computers

基　　金：广东省重大科技专项资助项目(2009A080207008)

摘　　要：为提高流量大且流量变化急剧的中高速无线传感器网络性能,针对竞争型MAC协议的退避算法进行研究,基于BDQR退避算法提出了一种流量预测的服务质量区分MAC退避算法FPQoSD。该算法引入流量预测因子,以实现流量精确预测而窗口动态适应目的;引入优先级因子,进行服务质量区分而满足关键数据实时性要求;利用能耗因子来自适应信道接入概率,均衡能耗而延长整体网络生命周期。NS2仿真结果表明,该FPQoSD退避算法在节点高密度与高负载环境下网络性能优越,其中吞吐量比BDQR算法提高15%,平均时延降低25%,平均能耗下降10%,整体生命周期得以延长。In order to improve the performance in high-speed sensor networks which traffic load was high and flow changes dramatically, this paper studied backoff algorithm of competitive MAC protocol, and based on BDQR proposed a backoff algo- rithm of MAC protocol with flow predicted and quality of service distinguished. The algorithm introduced a traffic predictor to accurately predict traffic and dynamically adapted the window ; introduced priority factor to achieve the distinction of quality of service, to meet the real-time requirements of critical data; used energy consumption factor for adaptive channel access proba- bility, to balance energy consumption and extend the life cycle of the overall network. The NS2 simulation results show that the network performance of FPQoSD backoff algorithm in the nodes of high-density and high-load environment is superior. The throughput is higher than BDQR algorithm by 15%, average delay decreases by 25%, average energy consumption decreases by 10% , and overall life cycle is lengthened.

关 键 词：中高速无线传感器网络 MAC协议 退避算法 流量预测 服务质量区分 能耗均衡 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]