无线网络预约退避算法的实现和分析

Implementation and Analysis of Reservation Backoff Algorithms for Wireless Network

针对无线局域网IEEE 802.11MAC层二进制退避算法的不足,当前已经提出多种典型退避算法。主要针对预约发送类退避算法进行研究分析,并提出与EBA不同的实现措施,对NS2网络仿真软件的Mac802.11模块进行了修改和扩展,实现了NS2对改进的预约退避算法的实现。结果表明,与标准DCF相比,改进的预约退避算法也能对IEEE802.11无线局域网的吞吐量、时延等方面性能有所改善。为今后基于NS2对预约退避算法的进一步开发研究奠定基础。

Wireless LAN IEEE 802.11MAC BEB（Binary Exponential Back-off） algorithm is discussed,and various typical back-off algorithms are proposed.The reservation back-off algorithms are studied and analyzed,the implementation different form EBA is proposed.The simulation module of Mac802.11 in NS2 is modified and extended,thus to implement the simulation of reservation back-off algorithms by NS2.Simulation results indicate that,compared with standard DCF,the modified reservation back-off algorithms could fairly enhance the performance of IEEE802.11 WLAN in throughput,delay and so on,and all this could lay a foundation for the future study of EBA algorithm with NS2.