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无线Ad Hoc网络的MAC层拥塞控制算法
  • 期刊名称：华中科技大学学报:自然科学版
  • 时间：2012
  • 页码：112-117
  • 分类：TP393[自动化与计算机技术—计算机应用技术;自动化与计算机技术—计算机科学与技术]
  • 作者机构：[1]北京航空航天大学电子信息工程学院,北京100191, [2]北京航空航天大学国家空管新航行系统技术重点实验室,北京100191
  • 相关基金：国家重点基础研究发展计划资助项目（2011CB707000）;国家高技术研究发展计划资助项目（2011AA110101）;国家自然科学基金资助项目（60933012）;国家自然科学基金创新研究群体科学基金资助项目（60921001）;教育部新世纪优秀人才支持计划资助项目;中央高校基本科研业务费专项资金资助项目
  • 相关项目：基于无线网络的应急搜救关键技术研究
作者： 马琳|张军|刘凯|
关键词： 通信技术, 无线AD, Hoc网络, 拥塞, 丢包, 自适应, communication technology, wireless Ad Hoc networks, congestion, packet loss, adaptive
中文摘要：

为解决无线Ad Hoc网络中拥塞主要由节点在MAC（媒体访问控制）层竞争无线信道而引起的问题,提出了一种基于无线环境监测的拥塞控制（EACC）算法.该算法通过监测IEEE 802.11的二进制指数退避过程判断MAC层拥塞状态,节点据此自适应调整数据分组的丢弃概率,通过丢包达到缓解拥塞的目的.利用IEEE 802.11DCF的信道接入机制,推导出MAC拥塞信息和吞吐量的关系方程,证明了该拥塞信息的正确性.仿真结果表明：EACC算法能够准确测量节点的拥塞程度,显著提高网络的吞吐量,从而有效地缓解网络拥塞.

英文摘要：

In wireless Ad Hoc networks,the congestion was mainly caused by the channel contention in the MAC（media access control） layer.To solve the problem,a new congestion control algorithm,EACC（environment aware congestion control）,was presented.Based on watching the wireless environment in EACC,by utilizing the binary exponential backoff,algorithm of IEEE 802.11 node could calculate the MAC layer congestion status.Using this congestion information node can adaptively adjust its packet loss probability and then drop the packet to alleviating the network congestion.In addition,the relationship between throughput and the MAC congestion indication was analyzed according to the IEEE 802.11 DCF medium access mechanism,and which proved the validity of the congestion indication.Simulation results show that the EACC algorithm can accurately judge the network congestion status,significantly increase the network throughput and effectively solve the network congestion problem at the MAC layer.

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