卫星动态链路上的可预知确定性流量调度  

Predictable Determined Traffic Scheduling Based on Satellite Dynamic Links

作　　者：张莹[1] 胡富国 黎军[3] 王佳[3] 李静玲[3] 姚明旿 ZHANG Ying;HU Fuguo;LI Jun;WANG Jia;LI Jingling;YAO Mingwu(The 54th Research Institute of CETC,Shijiazhuang 050081,China;School of Telecommunications Engineering,Xidian University,Xi’an 710071,China;National Key Laboratory of Science and Technology on Space Microwave,China Academy of Space Technology(Xi’an),Xi’an 710100,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]西安电子科技大学通信工程学院,陕西西安710071 [3]中国空间技术研究院西安分院空间微波技术重点实验室,陕西西安710100

出　　处：《无线电工程》2023年第7期1670-1677,共8页Radio Engineering

基　　金：GFKJ重点实验室基金项目(6142411192217)。

摘　　要：随着卫星网络的高速发展,卫星之间的动态链路上也出现了确定性传输需求。结合卫星链路的可预知动态特性,提出了运动平台上的时间敏感网络(Time Sensitive Network,TSN)调度机制,研究适用于链路变化的动态调度算法。在基于信用整形(Credit Based Shaper,CBS)算法模型基础上,研究分析CBS在动态变化网络场景中的时延特性。结合所建立的CBS分析模型,研究了带宽占比对于不同等级链路所起的作用。同时根据分析结果设计带宽调整方案,改进CBS算法,并提出链路切换保护机制,用以避免数据在链路状态切换过程中出现丢失。提出的动态方案不仅能提高卫星网络的数据转发确定性,并且能够根据不同数据帧的时延要求灵活分配带宽。With the high-speed development of satellite networks,determined transmission requirements have emerged on dynamic links between satellites.Combining the predictable dynamic characteristics of satellite links,Time Sensitive Network(TSN)scheduling mechanism on motion platform is proposed,and the dynamic scheduling algorithm applicable to link changes is studied.Based on the Credit Based Shaper(CBS)algorithm model,the time delay characteristics of CBS in dynamically changing network scenarios are studied and analyzed.Combined with the established CBS analysis model,the role of bandwidth occupation ratio for different levels of links is investigated.The bandwidth adjustment scheme is also designed based on the analysis results to improve the CBS algorithm,and a link switching protection mechanism is proposed to avoid possible data loss during link state switching.The proposed dynamic scheme not only improves the data forwarding determinacy of the satellite network,but also can flexibly allocate the bandwidth according to the delay requirements of different data frames.

关 键 词：时间敏感网络 调度机制 带宽调整 切换保护 

分 类 号：TN915.41[电子电信—通信与信息系统]