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.