一种用于无线网格骨干网的基于控制帧的功率控制MAC协议

A power control MAC protocol based on CTS control frame for wireless mesh backbone networks

针对无线网格骨干网中采用相同的发射频率造成严重信号干扰的问题,提出了一种新的功率控制MAC协议。该协议通过控制接收节点发送控制帧的功率,使得对整个数据发送和接收过程真正产生干扰的节点能够正确接收到该控制帧,从而延迟发送过程,避免信号干扰。该协议能够有效提高无线网格骨干网中无线接入点的空间复用度。理论分析表明,无线接入点的空间距离越短,空间复用度提高率越高。模拟试验表明,与IEEE802.11标准的MAC协议相比,该协议明显提高了网络中并行的互不干扰的数据发送过程数量,显著提高了整个网络的吞吐量。

To solve the problem of serious signal interferences in wireless mesh backbone networks caused by access points＇ usage of the same frequency channel for transmitting packets, this paper proposes a new power control MAC protocol. This protocol can control the transmitted power of the control frame sent by receiving nodes, so only those neighboring access points that really affect the forthcoming data reception can receive the control frame, thus delaying their transmission to avoid interferences. The proposed protocol can effectively improve the spatial reuse of access points in wireless mesh backbone networks. The theoretical analysis shows that the spatial reuse is improved more greatly when the distance between access points gets more shorter. The simulation studies show that compared with the IEEE802.11 standard MAC protocol, this protocol allows more concurrent transmission in the networks, and it improves the network throughput greatly.