一种高可靠的多通道MAC协议

针对工业无线传感器网络的应用需求和射频环境特点,提出了一种高可靠的多通道MAC协议CHNP.协议中给出了一种基于协商模式通道切换机制的MAC架构,并基于该架构给出了一种通道切换模式选择算法和一种自适应传输机制.前者可以实现更高程度的并发传输,而后者可在动态变化的射频条件下自适应地选择高质量通道进行传输.仿真表明,与已有多通道协议相比,CHNP可大幅提高网络的吞吐量、分组到达率以及MAC层延迟性能,并具有更好的抗干扰能力.

A Multi-channel MAC Protocol for Wireless Sensor Networks

This paper proposes the CHNP protocol,a highly reliable multi-channel MAC protocol which is optimized for the application requirement and radio environment of industrial wireless sensor networks.A MAC framework based on the channel hopping mechanism with negotiated pattern is provided in the protocol.At the same time,a hopping pattern selection algorithm and an adaptive transmission mechanism are designed to work on top of the framework.The former can achieve higher level parallel transmissions,and the latter can adaptively select the high quality channels for transmission in the dynamic radio environment.Simulation results show that compared with the existing multi-channel protocols,CHNP achieves a large performance improvement on throughput,packet delivery ratio,and MAC layer delay.What's more,it has the better capability of anti-interference.