DTN中基于消息质量度和节点可信度的拥塞控制  

Congestion Control Based on Message Quality and Node Reliability in DTN

作　　者：崔建群[1] 黄东升 常亚楠 吴淑庆 CUI Jian-qun;HUANG Dong-sheng;CHANG Ya-nan;WU Shu-qing(School of Computer,Central China Normal University,Wuhan 430079,China)

机构地区：[1]华中师范大学计算机学院,武汉430079

出　　处：《计算机科学》2021年第4期268-273,共6页Computer Science

基　　金：国家自然科学基金面上项目(61672257);国家自然科学基金青年项目(61702210)。

摘　　要：DTN(Delay Tolerant Network)具有间歇性连接、资源有限以及拓扑结构随机动态变化等特点,因此会受到网络资源有限和网络拓扑不确定性的限制,极易产生网络拥塞。针对这一问题,提出了一种基于消息质量度和节点可信度的拥塞控制策略CCMQ(Congestion Control Based on Message Quality and Node Reliability in DTN)。该策略主要根据消息的质量度划分消息的优先级,在转发消息时,将优先级高的消息优先转发;在选择下一跳节点时,选择节点可信度高的节点进行消息的转发,并充分考虑中继节点自身的属性;在发生拥塞时,消息质量度小的消息被率先丢弃,同时增加了S-ACK消息确认删除机制,以释放节点的缓存空间,从而有效缓解节点拥塞。仿真结果表明,相比传统的拥塞控制算法,CCMQ在消息递交率、网络负载率和平均时延性能方面都有较大的提升。Delay Tolerant Network(DTN)has the characteristics of intermittent connection,limited resources and random dynamic change of topology structure.Therefore,limited network resources and uncertainty of network topology can easily lead to network congestion.In order to solve this problem,this paper puts forward a kind of congestion control strategy(CCMQ)based on message quality degree and node reliability.In this strategy,messages are prioritized according to the quality of the message.When forwarding the message,the message with a higher priority is forwarded firstly.When the next hop node is selected,the node with high reliability is selected for message forwarding,and the attributes of the relay node are fully considered.When congestion occurs,messages with low message quality are discarded firstly,and the S-ACK message confirmation and deletion mechanism are added to release the cache space of the node,so as to effectively alleviate the node congestion.Simulation results show that compared with the traditional congestion control algorithm,CCMQ has better performance in message delivery rate,network load rate and average delay.

关 键 词：DTN 消息质量度 节点可信度 删除机制 拥塞控制策略 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]