WLAN中基于门限调整的速率自适应策略  

Rate Adaptation Strategy Based on Threshold Adjustment in WLAN

作　　者：程艳红[1] 陈良银[1] 朱丽[2] 

机构地区：[1]四川大学计算机学院,成都610065 [2]成都体育学院网络中心,成都610041

出　　处：《计算机工程》2011年第24期64-66,共3页Computer Engineering

基　　金：中央高校基本科研业务费专项基金资助项目(2009SCU11029);四川省教育厅课题基金资助项目(09ZC036)

摘　　要：针对IEEE802.11多速率无线局域网,提出一种基于门限调整的动态速率自适应媒体访问控制策略。该协议设置2组成功门限,分别对应快变和慢变2种信道情况,各组成功门限采用改进的二进制指数退避算法进行调整。协议无需修改802.11标准,易于实现。仿真结果表明,在各种网络条件下,该方案的性能优于现有基于ARF帧统计的速率自适应方案。This paper proposes a dynamic rate adaptation Media Access Control（MAC） strategy for multi-rate IEEE 802.11 wireless LAN based on threshold adjustment. In the protocol, two groups of success thresholds are set respectively for fast-fading and slow-fading wireless channels. Each group of success thresholds is tuned by an improved Binary Exponential Backoff（BEB） algorithm. Without any change to the current 802.11 standard, the protocol facilitates its implementation. Simulation results show that the new scheme outperforms other existing schemes including the Auto Rate Fallback（ARF） scheme and its variants.

关 键 词：IEEE 802.11标准 多速率 自适应 媒体访问控制协议 门限 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]