Asynchronous Duty Cycle With Network Coding MAC Protocol For Underwater Acoustic Sensor Networks

Wireless sensor network has been widely used in terrestrial networks.The 70% part of the earth is covered by ocean,meanwhile,marine technology and military demands.The acoustic wave as the transmission medium for underwater acoustic sensor networks(UWSNs)has became another research hotspot.Compared with the traditional terrestrial sensor network,the challenges of acoustic transmissions include long propagation delay,expensive transmitting power consumption and lower available bandwidth.To reduce the energy cost of UWSNs,the duty cycle(i.e.periodic wake-up and sleep)concept has been used in several medium access control(MAC)protocols.Although these protocols are energy efficient,they sacrifice bandwidth utilization,which lead to lower packet delivery rate(PDR).In this paper,Asynchronous Duty Cycle with Network Coding MAC(ADCNC-MAC)is proposed.It contains two phases,initialization of the MAC protocol phase and data transmission phase.In the initialization of the MAC protocol phase,we use asynchronous duty cycle to find a rendezvous time for exchanging data,each pair of nodes wake up and sleep periodic,it can minimize the time of idle listening.A strategy to select network coder nodes is presented to confirm the number of nodes and distribution,in order to avoid network coder nodes too much which lead to reduce the performance of the whole network.In data transmission phase,simple nodes simply forward the received data,whereas,the network coder nodes transmit using the proposed network coding based algorithm,this algorithm could improve the information of packets which improve PDR and throughput of network.We show the performance of ADCNC-MAC through detailed NS-3 simulation,and compared with some exist MAC protocols,quantified ADCNC-MAC achieves higher power efficiency,improved PDR and throughput of network,meanwhile,guaranteed the reliability of the network.