针对命名数据网络(named data networking,NDN)中,路由节点缓存利用的不合理、无法区分内容请求频率的高低,导致路由节点缓存命中率过低的问题,提出了一种基于新鲜因子的缓存替换策略(FRESH)。FRESH策略通过在包结构中新增内容类型、跳...针对命名数据网络(named data networking,NDN)中,路由节点缓存利用的不合理、无法区分内容请求频率的高低,导致路由节点缓存命中率过低的问题,提出了一种基于新鲜因子的缓存替换策略(FRESH)。FRESH策略通过在包结构中新增内容类型、跳数、动态时间3个Tag字段,引入信息熵衡量数据类型的优先级,利用新增Tag字段构建新的替换参量——“新鲜因子”,设计新的缓存替换策略。实验结果表明,在缓存容量比为0.03、Zipf分布参数为0.8的环境下,FRESH策略与DCVRP、CPCA相比较,缓存命中率分别增长了3.5%和6%,明显的提高了缓存命中率,优化了网络中的缓存效率。展开更多
The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in...The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in heterogeneous deployments.When multiple TSN networks interconnect over non-TSN networks,all devices in the network need to be syn-chronized by sharing a uniform time reference.How-ever,most non-TSN networks are best-effort.Path delay asymmetry and random noise accumulation can introduce unpredictable time errors during end-to-end time synchronization.These factors can degrade syn-chronization performance.Therefore,cross-domain time synchronization becomes a challenging issue for multiple TSN networks interconnected by non-TSN networks.This paper presents a cross-domain time synchronization scheme that follows the software-defined TSN(SD-TSN)paradigm.It utilizes a com-bined control plane constructed by a coordinate con-troller and a domain controller for centralized control and management of cross-domain time synchroniza-tion.The general operation flow of the cross-domain time synchronization process is designed.The mecha-nism of cross-domain time synchronization is revealed by introducing a synchronization model and an error compensation method.A TSN cross-domain proto-type testbed is constructed for verification.Results show that the scheme can achieve end-to-end high-precision time synchronization with accuracy and sta-bility.展开更多
近日,北京理工大学网络空间安全学院嵩天教授团队在新一代互联网架构研究与高性能网络处理技术方面取得重要突破。团队成果“Pt CAM:Scalable High-Speed Name Prefix Lookup Using TCAM”被2025年国际计算机网络领域学术会议ACM SIGCOM...近日,北京理工大学网络空间安全学院嵩天教授团队在新一代互联网架构研究与高性能网络处理技术方面取得重要突破。团队成果“Pt CAM:Scalable High-Speed Name Prefix Lookup Using TCAM”被2025年国际计算机网络领域学术会议ACM SIGCOMM主会议全文录用。展开更多
文摘针对命名数据网络(named data networking,NDN)中,路由节点缓存利用的不合理、无法区分内容请求频率的高低,导致路由节点缓存命中率过低的问题,提出了一种基于新鲜因子的缓存替换策略(FRESH)。FRESH策略通过在包结构中新增内容类型、跳数、动态时间3个Tag字段,引入信息熵衡量数据类型的优先级,利用新增Tag字段构建新的替换参量——“新鲜因子”,设计新的缓存替换策略。实验结果表明,在缓存容量比为0.03、Zipf分布参数为0.8的环境下,FRESH策略与DCVRP、CPCA相比较,缓存命中率分别增长了3.5%和6%,明显的提高了缓存命中率,优化了网络中的缓存效率。
基金supported in part by National Key R&D Program of China(Grant No.2022YFC3803700)in part by the National Natural Science Foundation of China(Grant No.92067102)in part by the project of Beijing Laboratory of Advanced Information Networks.
文摘The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in heterogeneous deployments.When multiple TSN networks interconnect over non-TSN networks,all devices in the network need to be syn-chronized by sharing a uniform time reference.How-ever,most non-TSN networks are best-effort.Path delay asymmetry and random noise accumulation can introduce unpredictable time errors during end-to-end time synchronization.These factors can degrade syn-chronization performance.Therefore,cross-domain time synchronization becomes a challenging issue for multiple TSN networks interconnected by non-TSN networks.This paper presents a cross-domain time synchronization scheme that follows the software-defined TSN(SD-TSN)paradigm.It utilizes a com-bined control plane constructed by a coordinate con-troller and a domain controller for centralized control and management of cross-domain time synchroniza-tion.The general operation flow of the cross-domain time synchronization process is designed.The mecha-nism of cross-domain time synchronization is revealed by introducing a synchronization model and an error compensation method.A TSN cross-domain proto-type testbed is constructed for verification.Results show that the scheme can achieve end-to-end high-precision time synchronization with accuracy and sta-bility.
文摘近日,北京理工大学网络空间安全学院嵩天教授团队在新一代互联网架构研究与高性能网络处理技术方面取得重要突破。团队成果“Pt CAM:Scalable High-Speed Name Prefix Lookup Using TCAM”被2025年国际计算机网络领域学术会议ACM SIGCOMM主会议全文录用。
