Abstract: To select the best transmission rate based on dynamic channel quality in IEEE 802.11 wireless networks, this paper presents weighted frame-loss-ratio based adaptive threshold rate adaptation algorithm. It calculates weighted frame loss ratio and decides upscaling and downscaling thresholds. The mechanism avoids wrong choice because of random frame loss and rate fluctuation. Simulation results show that it is robust for Rayleigh and Ricean channel, the throughput is better than other rate adaptation solutions.

Key words: rate adaptation, IEEE 802.11 standard, threshold

摘要： 为了在IEEE 802.11无线网络中根据信道的动态变化恰当地选择传输速率，提出基于加权丢帧率的可调门限速率自适应算法。该机制加权计算丢帧率，自适应调整门限，能克服随机丢帧造成的误判，避免速率频繁波动，使速率选择更准确。仿真结果表明，该机制在Rayleigh信道和Ricean信道中均表现稳定，与其他速率自适应算法相比，吞吐量较优。

关键词: 速率自适应, IEEE 802.11标准, 门限

CLC Number: 

• TP393.02