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目前的IEEE 802.11标准在物理层支持多速率传输,但在媒体接入控制(MAC,Media AccessControl)层却没有相应的速率自适应方法。针对目前Ad Hoc网络自适应速率控制方法的不足和在无线通信环境下TCP性能会大幅度恶化,提出了一种改进的MAC层速率自适应协议,该协议实现简单,与传统标准兼容性好,在提高TCP吞吐量的基础上能适应快速变化的无线信道,且能实现分段数据包的速率自适应传输。仿真结果表明,该协议比RBAR协议有更好的吞吐量。
The current IEEE 802.11 standard supports multi-rate transmission at the physical layer, but there is no corresponding rate adaptation method at the Media Access Control (MAC) layer. Aiming at the shortcomings of Ad Hoc network adaptive rate control method and the deterioration of TCP performance in wireless communication environment, an improved MAC layer rate adaptation protocol is proposed. The protocol is simple and has good compatibility with traditional standards. On the basis of improving TCP throughput, it can adapt to the rapidly changing wireless channel, and can realize the rate adaptive transmission of segmented data packets. Simulation results show that the protocol has better throughput than RBAR protocol.