延迟容忍网络状态感知的路由策略研究
doi: 10.3724/SP.J.1146.2010.00410
Research of Situation-aware Routing Method in Delay Tolerant Network
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摘要: 延迟容忍网络具有间歇连通的特点，这为数据传输提出了很大的挑战。目前的路由算法没有充分考虑节点的整个状态(位置、速度)，该文提出了一种节点状态感知的路由策略SARM(Situation-Aware Routing Method)。SARM根据节点的状态估计它能把消息传送到汇聚节点的可能性，并把消息复制到那些比自身可能性大的节点上。该文根据消息的生存时间、剩余时间及复制次数提出了一种消息队列管理机制。仿真实验表明，SARM在不增加消息副本数量的情况下提高了传输成功率并降低了传输延迟。Abstract: The characteristic of loose connectivity of Delay Tolerant Network (DTN) is a huge challenge for data delivery. All of the routing methods do not thoroughly use the status of the peer, so SARM (Situation-Aware Routing Method) is proposed. SARM estimates the delivery probability of a peer according to the peers situation, and copies the message to its neighbor whose delivery probability is bigger. A queue management method is proposed according to the messages age, time of left and the number of copies. Simulation shows that SARM achieves a higher message delivery ratio and lower delivery delay without more transmission overhead.
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Key words:
- Delay Tolerant Network (DTN) /
- Routing method /
- Delivery probability /
- Queue management
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