Sender Cooperative Multichannel MAC Protocol For Underwater Acoustic Networks

As one of the important means to develop the ocean and develop the marine economy,underwater acoustic networks(UANs)is the current research hotspot.The research and design of UANs networking technology faces long delay,low bandwidth,energy constraints and other challenges.As one of the core technologies of the underwater acoustic networks,the media access control(MAC)protocol is used to coordinate the underwater nodes to share channels and avoid collisions between nodes.The underwater multichannel technology allows multiple pairs of nodes to simultaneously transmit data to effectively utilize bandwidth resources,but using the receiver cooperation method in the multichannel MAC protocol increases the network transmission delay,and the use of available channel determination method based on occupancy time increases the idle time of data channel.Aiming at the above problems,this paper proposes a Sender Cooperative Multichannel MAC(SCM-MAC)protocol.In this protocol,the sender initiates cooperation with the neighboring nodes to select the data channel while transmitting the transmission request.By reducing the number of communication times in the channel reservation process,the delay and energy consumption are reduced;When deciding the available data channel,considering the propagation delay between nodes,the data channel whose arrival time of data packets does not conflict is determined as the available channel,which reduces the idle waiting time of the channel.In this paper,the SCM-MAC protocol is simulated under the NS-3 simulation platform.Compared with the existing multichannel MAC protocols,this protocol increases the throughput,reduces the end-to-end delay,reduces the energy consumption and improves the overall performance of the network.