Abstract: In the design of asynchronous receiver-initiated wireless sensor network medium access control protocols,conventional protocols adopt receiver-dominated wakeup manner,which prolongs the period for persistent channel detection of upstream sender,thus increasing both delivery latency and energy consumption.The impact of different wakeup methods on delivery delay is studied and a novel receiver-initiated sender-dominated medium access control (RISD-MAC) protocol is thus proposed to adjust the wakeup time of the intended receiver adaptively based on the wakeup schedule of its upstream sender,which guarantees the rendezvous of data delivery of both sides to achieve communication efficiency.The simulation results show that compared with RI-MAC,a state-of-the-art medium access control protocol in wireless sensor networks,RISD-MAC achieves less delivery latency and lower duty cycle while maintaining comparable packet delivery ratio.

Key words: Wireless sensor networks,Medium access control,Receiver initiated,Delivery latency,Wakeup schedule