基于节点紧密度中继转发的移动延迟容忍传感网传输算法

The Transmission Algorithm for Mobile Delay Tolerant Sensor Networks Based on Relay Forwarding Mechanism of Nodes Compactness

为解决移动延迟容忍传感网存在的时延突出、超宽带传输性能不佳等问题,提出了一种基于节点紧密度中继转发的移动延迟容忍传感网传输算法。引入邻域节点数量作为指标,以评估节点相遇概率,将节点相遇过程优化为邻域节点覆盖问题,以提升网络对节点相遇过程的感知能力。采用邻域节点重复覆盖数量作为判定依据,以评估节点运动性能,设计了基于紧密度的节点相遇感知机制,对节点运动活跃程度进行感知,增强节点对相遇过程的感知能力,有效提高下一跳目标节点的链接质量。基于马尔科夫评估机制,采用连接状态转移矩阵来评估节点链接概率,优选链接性能较高的节点作为下一跳节点,以优化源节点与目的节点间链路,增强链路对高带宽传输环境的适应能力。仿真结果表明,与基于分簇机制的传感网节能传输算法和基于低时延机制的传感网传输编码算法相比,所提算法具有更低的平均端对端时延和链路累计中断次数,以及更高的全网传输带宽。

In order to solve the problems of prominent delay and poor UWB transmission performance in mobile Delay Tolerant Sensor Network,a transmission algorithm of mobile Delay Tolerant Sensor Network Based on node tightness relay forwarding is proposed.The number of neighborhood nodes is introduced as an index to evaluate the node encounter probability,and the node encounter process is optimized as a neighborhood node coverage problem to improve the network’s perception of the node encounter process.The number of repeated coverage of neighborhood nodes is used as the judgment basis to evaluate the node motion performance.A node encounter per-ception mechanism based on tightness is designed to improve the network’s perception of node forwarding quality.Combined with the weight coefficient,the node motion activity is perceived to enhance the node’s perception of the encounter process and effectively im-prove the link quality of the next hop target node.Based on the Markov evaluation mechanism,the connection state transition matrix is used to evaluate the node link probability,and the node with high link performance is selected as the next hop node,so as to optimize the link between the source node and the destination node and enhance the adaptability of the link to the high bandwidth transmission environment.Experimental results show that compared with the energy-saving transmission algorithm based on clustering mechanism and the transmission coding algorithm based on low delay mechanism,the proposed algorithm has lower average end-to-end delay,cumulative number of link interrupts,and higher network wide transmission bandwidth.