基于网络演算的卫星网络端到端时延上界  

The Bound of Satellite Network End-to-End Delay by Network Calculus

作　　者：魏德宾[1,2,3] 王旭 杨力[1,2] WEI De-bin;WANG Xu;YANG Li(Communication and Network Laboratory,Dalian University,Dalian Liaoning 116622,China;Information and Engineering College,Dalian University,Dalian Liaoning 116622,China;School of Automation,Nanjing University of Science and Technology,Nanjing Jiangsu 210094,China)

机构地区：[1]大连大学通信与网络重点实验室,辽宁大连116622 [2]大连大学信息工程学院,辽宁大连116622 [3]南京理工大学自动化学院,江苏南京210094

出　　处：《计算机仿真》2022年第10期44-49,共6页Computer Simulation

基　　金：国家自然科学基金(61931004,61801073)。

摘　　要：针对卫星网络链路传播时延周期性变化且变化量不可忽略,传统时延边界计算过于放大排队时延等问题,提出了一种卫星网络端到端时延上界分析方法。通过计算星间链路长度推算链路传播时延,并将链路处于峰值速率时的排队时延作为链路排队时延最大值,计算卫星网络端到端时延上界。进一步,分别研究端到端路径包含节点数目、节点服务速率、业务流权重值以及突发量等对卫星网络端到端时延上界的影响。仿真结果表明,在铱星拓扑结构下,卫星网络的端到端时延上界比基于令牌桶模型计算的端到端时延上界更接近于仿真值。In order to solve the problems of propagation delay in satellite networks, such as periodic change and non-negligible change, and traditional delay boundary calculation which overmagnifies queued delay, a method for analyzing the upper bound of end-to-end delay in satellite networks is proposed. Link propagation delay is calculated by calculating the length of the inter-satellite link, and the queueing delay at the peak link rate is taken as the maximum link queueing delay, and the upper bound of end-to-end delay in the satellite network is obtained. Further, the influence of the number of nodes, node service rate, traffic weight value and burst volume on the upper bound of the end-to-end delay of the satellite network is studied. Simulation results show that under Iridium satellite topology, the upper bound of the end-to-end delay in the satellite network is closer to the simulation value than the upper bound of the end-to-end delay calculated based on the leaky bucket model.

关 键 词：卫星网络 峰值速率 令牌桶模型 时延上界 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]