针对水下移动传感网络(underwater mobile sensor network,UWMSN)中使用自主移动节点进行数据收集存在的拓扑结构不断变化、传输不可靠的问题,提出一种动态退避发送数据帧的自适应媒体接入控制(media access control,MAC)协议,通过将协议划分为控制阶段与数据阶段周期性地更新可建立通信的节点信息,根据当前周期获得的节点距离信息调度各节点数据传输顺序,利用水下环境的大传播时延计算各节点的回退发送数据帧的时间,使用数据重传机制提高传输的可靠性.采用OPNET网络仿真模拟器对提出的协议进行仿真和对比分析.仿真结果显示,协议在密度较低的小范围水下传感网络中可保证较高的投递成功率和较低的端到端时延,增大了网络吞吐量,提高了网络性能.
Research of MAC protocol for underwater mobile convergence nodes
A dynamic backoff adaptive media access control(MAC)protocol for sending data frames is proposed to address the issues of constantly changing topology and unreliable transmission when using autonomous mobile nodes for data collection in underwater mobile sensor networks(UWMSN).The protocol is divided into control phase and data phase to periodically update the node information that can establish communication,and the data transmission order of each node is scheduled based on the node distance information obtained in the current cycle.Using the large propagation delay of the underwater environment to calculate the time for each node to send data frames back,and using a data retransmission mechanism to improve transmission reliability.The proposed protocol was simulated and compared using an OPNET network simulation simulator.The simulation results show that the protocol can ensure a high delivery success rate and low end-to-end delay in low-density small-scale underwater sensor networks,increasing network throughput and improving network performance.
万方数据
维普
