无线Mesh网络速率自适应算法研究

Research on Adaptive Rate Algorithm of Wireless Mesh Network

自适应速率选择是影响无线Mesh网性能的关键问题。提出了一种基于动态解调门限的速率自适应选择算法,该算法通过统计传输速率进行速率选择,能够针对不同信道环境对每种调制速率所需最小信噪比门限进行自动调整。同时,采用跨层设计思想,采用路由协议广播报文作为MESH设备间传输信噪比信息的载体,从而能够根据信噪比和传输成功率信息得到信道环境下的最佳发送速率。实际测试结果表明,所提算法能够在较短时间内选择出最佳速率,而且具有较低的抖动和稳定的吞吐量。

Adaptive rate selection is a key problem affecting the performance of wireless mesh network.This paper presents an adaptive rate algorithm based on dynamic demodulation threshold.The algorithm adopts the method of successful transmission rate statistics.The minimum SNR threshold of each modulation rate is adjusted automatically in different environments.Meanwhile,the routing protocol broadcast message is used as the carrier to transfer SNR information between devices.The optimal modulation rate in the current channel environment can be selected according to SNR and the successful transmission rate.Practical tests show that the proposed algorithm can select the optimal rate in short time.Moreover,it provides lower jitter and stable throughput.