一种应用于无线传输网络的优先级退避算法  

A priority backoff algorithm applied in the wireless transmission network

作　　者：李靖平[1] 

机构地区：[1]黎明职业大学信息与电子工程学院,福建泉州362000

出　　处：《郑州轻工业学院学报（自然科学版）》2015年第2期60-66,共7页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：泉州市技术研究与开发项目高校协同创新科技项目(2012Z131);福建省教育厅B类科技研究项目(JB12487S);黎明职业大学校课题项目(LZ2011101);泉州市科技局科技资助项目(2008G16)

摘　　要：基于P_BEB算法,提出了一种改进的优先级退避算法.该算法通过概率g确定竞争窗口值,执行发送动作;若数据帧发送失败,根据时隙使用率设置翻倍竞争窗口值,发送成功后,以概率g设置窗口值,即依据网络当前的拥塞程度来调整竞争窗口值.利用Infrastructure场景对优化后的算法进行验证,结果表明该方法可有效提高吞吐量,并且可以维持较小的接入时延,降低系统的丢包量,较好地改善无线局域网的性能.An improved priority backoff algorithm was proposed based on the P BEB algorithm. The algo-rithm determined the contention window value by the probability g,and then executed the send action. If the data frames sent failure,the competition window value was set double according to the time slot utiliza-tion rate,with probability g settings window value after the success of the send,namely according to the adjustment of the current value of the contention window. The optimized algorithm was verified using the Infrastructure scene,the results showed that this method effectively improved the throughput,and could maintain the small access delay,reduce packet loss amount of system,and improve the performance of wireless local area network.

关 键 词：无线局域网 IEEE 802. 11 P 概率接入控制机制 退避算法 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]