延迟容忍移动传感器网络中基于节点优先级的数据转发策略

Data Delivery Scheme of Delay Tolerant Mobile Sensor Network Based on Node Priority

为了更好地解决延迟容忍移动无线传感器网络(Delay Tolerant Mobile Sensor Network,DTMSN)中的数据收集问题,提出了一种基于节点优先级的数据转发策略NPD(Node Priority Data Delivery Scheme)。NPD根据计算得出的各节点不同的转发优先级作为消息传输时选择下一跳的依据。为优化消息复本管理,NPD采用动态消息队列,并根据消息的生存时间决定消息的丢弃原则。仿真实验表明,与现有的几种DTMSN数据传输算法相比,NPD有更高的数据传输成功率与更小的传输延迟,并具有相对较长的网络寿命。

To better solve the problem of data collection in DTMSN（delay tolerant mobile sensor network,DTMSN）,this paper proposed a new data delivery scheme-NPD（Node Priority Data Delivery Scheme）.NPD calculates the node delivery priority,according to which nodes make decisions when delivering messages.To optimize the management of information copy,NPD adopted dynamic message queue and decided on the principle of abandoning messages based on their survival time.Simulation results show that compared with the existing algorithm of DTMSN data transmission,NPD has a higher delivery ratio in data transmission and smaller delivery delay and it has a relatively longer network lifetime.