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 ControKMAC) 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.
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