一种增大初始竞争窗口的无线自组网退避算法  

A new backoff algorithm that enlarges the initial contention window in wireless ad hoc networks

作　　者：何双胜[1] 张广泉[1] 李蓥[1] 

机构地区：[1]苏州大学计算机科学与技术学院,江苏苏州215006

出　　处：《苏州大学学报（自然科学版）》2011年第1期27-31,共5页Journal of Soochow University(Natural Science Edition)

基　　金：中国科学院计算机科学国家重点实验室开放课题(SYSKT0908);江苏省高校自然科学研究项目(08KJB520010)

摘　　要：研究了现有的用于无线自组网的典型退避机制——二进制指数退避,并指出其存在的不足.在此基础上提出一种增大初始竞争窗口的退避算法,以提高节点接入信道的公平性.分析和仿真结果表明,与IEEE802.11采用的退避算法相比,本文提出的算法对网络吞吐量和信道接入公平性等性能指标均有较好的改善.In this paper,the existing typical backoff mechanism for wireless ad hoc networks—the binary exponential backoff was studied,and its shortcomings were pointed out.On this basis,a new backoff algorithm that enlarges the initial contention window is presented in order to improve channel access fairness.Analysis and simulation results show that,compared to the backoff algorithm used in IEEE 802.11 standard,the algorithm in this paper can improve both network throughput and channel access fairness.

关 键 词：无线自组网 退避算法 初始竞争窗口 吞吐量 公平性 MAC协议 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]