摘要
针对IEEE 802.11 MAC协议二进制退避算法存在的缺陷,引入随网络状态变化的参数,提出了一种基于对数函数的新退避算法。该算法使用以网络节点数为变量的对数函数,动态调整竞争窗口初始值和窗口退避增大幅度,降低了数据传输的冲突概率,利用OPNET软件实现对退避算法的网络仿真。仿真结果表明,基于对数函数的退避算法对提高Ad Hoc网络的吞吐量性能和公平性、降低网络延时有明显的效果,性能优于二进制退避算法。
Based on logarithmic function, a new backoff algorithm was presented by introducing the parameter which could change with the network state, in allusion to the deficiencies of Binary Exponential Backoff algorithm of IEEE 802.11 MAC. This algorithm dynamically changed the initial value of collision window and the increasing extent of backoff by using the logarithmic function which took the numbers of network nodes as variable and reduced the probability of collision of data transmission, and the network simulations were carried out by the OPNET software. The results of simulation show that the backoff algorithm based on logarithmic function is obviously effective in improving the capability of throughput and fairness of Ad Hoc network, reducing network delay and the ratio of packet loss, and the capability of new backoff algorithm is better than that of Binary Exponential Backoff algorithm.
出处
《计算机应用》
CSCD
北大核心
2009年第1期18-20,24,共4页
journal of Computer Applications
作者简介
徐磊（1984-），男，河北沧州人，硕士研究生，主要研究方向：多媒体通信.xulei19840604@163．com
方红雨（1968-），女，安徽绩溪人，高级工程师，主要研究方向：无线网络协议与算法、通信网络优化.
李晓辉（1961-），男，安徽合肥人，教授，博士，主要研究方向：宽带移动通信、多媒体通信。
