基于跨层竞争的同步MAC协议研究

在无线传感器网络(WSNs)中,基于跨层竞争的同步媒体接入控制(MAC)在一周期内可安排多个数据包的多跳传输,传统的协议在同一个数据窗口传输请求数据包和确认数据包,降低了数据窗口的多跳流量的建立,也降低了在多跳场景中的数据包传输率和传输时延性能.本文提出了基于新的基于跨层竞争的同步MAC(CLC-MAC)协议,CLC-MAC协议引用新的周期结构,且其包含两个独立窗口,并由该窗口分别传输数据请求包和确认包,即请求包在数据窗口传输,而确认包在休眠窗口传输.实验数据表明:与先锋路由帧MAC(PRMAC)协议相比,CLC-MAC协议的端到端传输时延和数据包传输率的性能均得到了提高.

Research on synchronous MAC protocol based on cross layer competition

Synchronous medium access control (MAC )protocols based on cross-layer competition for wireless sensor networks(WSNs)enable multi-hop transmission of multiple data packets in a cycle. Traditional protocols transmit both the request-to-send data(RTSD)process and the confirm-to-send data(CTSD)process in the same data transmission scheduling window(i. e. data window),this reduces the length of the multi-hop flow setup in the data window. In a multi-hop scenario,this degrades both the packet delivery ratio and the end-to-end transmission delay. Therefore,a new cross-layer competition based synchronous MAC(CLC-MAC)protocol is proposed. The proposed protocol uses a novel cycle structure,which contains two separate windows for transmitting data request and confirmation packets. It accommodates the request-to-send data process in the data window and the confirmation-to-send data process in the sleep window. Simulation results show that proposed protocol outperforms pioneer routing frame MAC(PRMAC)both in terms of the end-to-end delay and the packet delivery ratio.