一种低延时的无线传感器网络MAC协议

摘要

针对典型无线传感器网络X-MAC协议在多跳环境下累积延迟问题，提出一种具有低时延的Ex-MAC协议。利用管理邻居节点工作周期和虚通道算法，使得虚通道中的所有节点近似于同步，从而减少数据传输延迟，而且不需要交换同步控制帧。仿真结果与X-MAC协议相比，减少了端到端的延迟和数据包冲突的几率，提高了网络的吞吐量。%Aiming at accumulative latency problem of typical X-MAC protocol of typical wireless sensor networks ( WSNs),a Ex-MAC protocol combining virtual channel and scheduling algorithm is proposed. The protocol makes all nodes of virtual channel be approximately synchronous,so as to reduces data transmission delay without exchanging synchronous control frame. The simulation results shows that Ex-MAC can reduce the end-to-end delay,the ratio of data packet conflict and increase throughput of networks.