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中文摘要：
通过分析IEEE 802．11 DCF的分组发送过程，获得了RTS和基本方式下分组传输的时间开销。给出了以最小化传输时间开销代价为优化目标的最优RTS门限的计算公式。通过对当前信道分组发送的成功概率P，的预测，实现了最优RTS门限的计算，并给出了一个具体的自适应RTS门限调整算法，使终端能自动调整其RTS门限以达到或接近最优值。仿真表明自适应RTS门限调整算法有效减小了MAC分组传送的时间开销，提高了信道的传输效率。
英文摘要：
The packet transmission time overhead of RTS access mode and basic access mode by analyze the MAC frames transmission procedure in IEEE 802.11 DCF were achieved. Formulas to calculate the optimal RTS threshold was given out based on minimizing the packet transmission time overhead. An adaptive RTS threshold adjustment algorithm was presented to enable wireless nodes achieve the optimal RTS threshold based on the estimation of packet successful transmitting probability. Simulation shows that the adaptive RTS threshold adjustment algorithm can greatly decrease the transmission time overhead of MAC frames, and enhance the transmission efficiency of 802.11 DCF.
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