接收端发起的异步无线传感器网络MAC协议

为了减少无线传感器网络中由于空闲侦听而产生的能量消耗,在接收端发起的介质访问控制(RI-MAC)协议基础上提出一种新的接收端发起的异步RP-MAC。该协议通过预测接收节点唤醒时间,采用随机数作为唤醒间隔,改进RI-MAC的重传机制,从而减少了空闲侦听和网络冲突。NS2仿真结果表明,改进后的MAC协议在在高负载网络中显著降低了节点工作的占空比,提高了包交付率,从而减少了网络能耗。

Receiver-initiated asynchronous MAC protocol for wireless sensor networks

Based on a Receiver-Initiated Medium Access Control (RI-MAC) protocol, a new receiver-initiated asynchronous Medium Access Control (MAC) protocol called Receiver-Predictive MAC (RP-MAC) protocol was proposed for the purpose of reducing the energy consumption caused by idle listening in wireless sensor networks. The wakeup time of the receiving node could be predicted by RP-MAC. In the proposed MAC protocol, a random number was used as a wakeup interval, the next wakeup time was forecasted by the previous two wakeup intervals, and the retransmission mechanism of RI-MAC was improved as well, thereby the idle listening and network conflicts were reduced. The simulation on NS2 shows that the duty cycle of the node work is significantly reduced by the improved MAC protocol in high load network, and the delivery rate of packet is successfully improved, and the network energy consumption is reduced at the same time.