DTN中适用于节点环境状态的拥塞控制管理策略  

Congestion Control Management Strategy Suitable for Node Environment State in DTN

作　　者：崔建群[1] 陈紫怡 常亚楠 陈欢欢 龚双 CUI Jianqun;CHEN Ziyi;CHANG Yanan;CHEN Huanhuan;GONG Shuang(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：《小型微型计算机系统》2024年第3期707-717,共11页Journal of Chinese Computer Systems

基　　金：国家自然科学基金面上项目(62272189、61672257)资助.

摘　　要：针对容迟网络中节点存储空间有限从而出现大量丢包情况的问题,本文提出了一种适用于节点环境状态的拥塞控制管理策略(congestion control management strategy suitable for the state of the node environment,NEMS):该策略由节点间位置差异相关的控制保留策略和节点自差异相关的丢包策略构成.首先根据节点剩余缓存空间的大小判断节点是处于忙碌状态(BS)还是崩溃状态(CS),当节点处于BS状态时,节点间位置差异相关的控制保留策略结合门限度和连接活跃值的概念分析是否留存新消息.节点自差异相关的丢包策略利用熵权法动态计算各个节点中不同消息属性权重,得到消息丢弃优先级.当拥塞发生,优先删除丢弃优先级大的消息.同时,引入ACK反馈机制,消除网络中已成功投递的冗余消息.仿真结果表明,与无缓存管理的路由策略相比,加入NEMS后使得消息成功投递率增加了约100.93%~200.67%,网络负载降低了约76.05%~81.42%.Aiming at the problem of a large number of packet loss due to the limited storage space of nodes in a delay-tolerant network,this paper proposes a congestion control management strategy suitable for the state of the node environment(NEMS):This strategy consists of a control retention strategy related to the position difference between nodes and a packet loss strategy related to the node self-difference.First,according to the size of the node′s remaining cache space,it is judged whether the node is in a busy state(BS)or a crash state(CS).In the BS state,the control retention strategy related to the position difference between nodes combines the concepts of threshold and connection active value to analyze whether new messages are retained.The packet loss strategy related to node self-difference uses the entropy weight method to dynamically calculate the weights of different message attributes in each node,Get the message discarding priority.When congestion occurs,messages with high discarding priority are preferentially deleted.At the same time,an ACK feedback mechanism is introduced to eliminate redundant messages that have been successfully delivered in the network.The simulation results show that compared with the routing strategy without cache management,After adding NEMS,the message delivery rate increased by about 100.93%~200.67%,and the network load was reduced by about 76.05%~81.42%.

关 键 词：容迟网络 连接活跃程度 熵权法 拥塞控制 缓存管理 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]