基于节点行为分析的自私性延迟容忍网络消息转发机制

摘要

In Delay Tolerant Network(DTN),the forwarding mechanism can cause the relay node to refuse forwarding messages because of the selfish behavior of the node,which results in a decline in network performance such as lower message delivery ratio and longer transmission latency.Focusing on this problem,this paper puts forward a selfish DTN message forwarding mechanism Based on Node Behavior Analysis(BNBA).On the basis of multi-copy transmission and through researching the characteristics of cooperation and noncooperation behaviors between encountered nodes,the node state probability transfer model is established and the process of message delivery between nodes is predicted.According to message copy forwarding conditions,neighbor nodes are selected to forward message with injection.If the message copy doesn’t reach its destination,the submission method based on encountering probability of the destination is enabled. Simulation results show that,compared with Epidemic +TFT,Spay and Wait +TFT and Bubble Rap,the proposed mechanism has higher performance in message delivery ratio,transmission delay and network overhead.%延迟容忍网络中的转发机制因节点自私性行为会造成中继节点拒绝转发，并导致消息投递率降低、传输时延增长等性能下降问题。为此，基于节点行为分析，提出一种自私性延迟容忍网络消息转发机制。该机制以多副本传输为基础，通过研究节点行为中的合作特性和非合作特性建立节点状态概率转移模型，进而预测节点间消息的递交过程。利用消息副本转发条件对邻居节点进行选择喷射递交。若副本未到达目的节点，则进行基于目的节点相遇概率的递交方式。仿真结果表明，相比具有激励机制的传染路由、具有激励机制的喷射等待路由以及社会路由机制，该机制在消息投递率、传输时延、网络开销方面均具有较好的性能。