基于CSMA/CD以太网的军事通信网实时性分析

摘要

目前基于以太网的军事通信网架构下.CSMA/CD接入方式端到端的网络时延不确定性问题严重影响了将以太网作为军事通信网络通用标准的决心;利用排队论原理,对以太网MAC传输进行了模型分析,根据IEEE802.3标准规范和二进制回退算法的具体实现,推导出了以太网网络MAC层CSMA/CD接入造成的时延及其概率分布的计算方案;通过对MAC层延时的定量分析,比较军事通信网传输作业对于网络实时性的要求可知.基于CSMA/CD的以太网网络完全符合当前以及未来军事通信的对于实时性的要求;最后,利用基于Matlab的网络仿真模块TrueTime进行建模仿真,验证了算法的正确性.%Under the military communication network framework based on Ethernet at present, the end to end time-delay in CSMA/CD media access method uncertain problem influence regard Ethernet as military communication network resolution of universal standard seriously. Utilize the queuing theory principle, transmit and analyze models about Ethernet MAC, according to the realizing specifically of IEEE802.3 standard norm and binary rollback algorithm, derives the time-delay happened in MAC layer and calculation scheme of probability distribution. Through quantitative analysis of time-delay of MAC, considering the requirement for the real-time character of the military communication network, can get that the military communication network based on CSMA/CD Ethernet network can meet the military requirement at present and future for real-time character of communication totally. Finally, utilize artificial module TrueTime of network based on Matlab to build and imitate really, verified the exactness of the algorithm.