Tor网络作为最受欢迎的匿名网络之一,使用TCP协议作为传输层协议,这一选择导致了行首阻塞、带宽分配不公平以及低效的拥塞控制等问题,严重影响了Tor网络的性能和扩展性。目前有研究使用QUIC协议的Tor Over QUIC模式来解决这些问题。然而...Tor网络作为最受欢迎的匿名网络之一,使用TCP协议作为传输层协议,这一选择导致了行首阻塞、带宽分配不公平以及低效的拥塞控制等问题,严重影响了Tor网络的性能和扩展性。目前有研究使用QUIC协议的Tor Over QUIC模式来解决这些问题。然而,Tor Over QUIC模式下性能评估指标单一,仅聚焦在时延和安全性评估,难以全面反映协议升级对匿名网络核心特性的综合影响,导致协议优化方向不明确且部署决策缺乏数据支撑。这种评估维度缺失不仅制约了QUIC协议优势的充分发挥,更可能因性能短板影响用户采用意愿,容易影响Tor Over QUIC的推广与使用。因此,提出了一种基于Tor Over QUIC的多维度性能评估方法,从时延、匿名性、安全性、鲁棒性和可用性等多个维度对Tor Over QUIC模式下的性能进行综合评估,以指导Tor Over QUIC的部署与使用。对Tor网络和Tor Over QUIC网络进行的对比实验表明,所提评估方法是有效且实用的。展开更多
随着移动互联网的快速发展,实时场景类移动应用(APP,APPLICATION)都具有实时消息处理和分发能力;而移动互联网会出现高延时、高丢包率的弱网环境,严重影响用户的使用体验;分析了当前实时消息处理系统的一般网络架构和传输控制协议(TCP,T...随着移动互联网的快速发展,实时场景类移动应用(APP,APPLICATION)都具有实时消息处理和分发能力;而移动互联网会出现高延时、高丢包率的弱网环境,严重影响用户的使用体验;分析了当前实时消息处理系统的一般网络架构和传输控制协议(TCP,Transmission Control Protocol)的性能瓶颈;进一步分析了快速UDP互联网连接(QUIC,Quick UDP Internet Connections)协议的机制和特性;提出并实现了以QUIC协议为基础的实时消息处理系统;最后在模拟弱网环境下对QUIC和TCP协议进行对比性能测试,测试结果表明基于QUIC协议的实现方案在弱网环境下性能有较明显的优势。展开更多
QUIC是由Google提出的用于替代TCP(Transmission Control Protocol)的互联网数据传输协议.它引入了许多新的特性,从而在理论上拥有比TCP更好的性能.例如,它通过多路传输解决了队头阻塞问题,通过0-RTT握手降低了传输层握手延时,以及通过...QUIC是由Google提出的用于替代TCP(Transmission Control Protocol)的互联网数据传输协议.它引入了许多新的特性,从而在理论上拥有比TCP更好的性能.例如,它通过多路传输解决了队头阻塞问题,通过0-RTT握手降低了传输层握手延时,以及通过连接迁移更好地对移动性提供支持.但是,现实生活中的网络环境和终端设备是多样性的,并且互联网中存在着各种各样的攻击,所以QUIC在实际网络中的表现可能并不如预期.因此,探究QUIC对现有网络服务的影响是一项很重要的工作.首先介绍了QUIC的发展历史及其主要特性,并以目前使用最为广泛的2个应用场景——网页浏览和视频传输——为例,介绍并总结了国内外对QUIC在不同网络环境下的传输性能的研究分析.随后,从协议设计和系统设计2个方面列举了目前已有的对QUIC的优化工作,并对现有的对QUIC安全性分析的相关工作进行总结,还列举了目前学术界公认的QUIC所存在的安全性问题以及研究者为解决此类问题所作出的努力.最后,对现有研究成果可能的进一步提高之处进行了总结,并对QUIC带来的新的研究课题及其挑战进行了展望.展开更多
随着高清和超高清直播需求的增长,传统编码技术在压缩效率和传输质量方面逐渐显现出局限性。针对这一问题,提出基于高效视频编码(High Efficiency Video Coding,HEVC)技术的优化策略,以期改善直播电视信号的压缩效率、传输延迟及画质清...随着高清和超高清直播需求的增长,传统编码技术在压缩效率和传输质量方面逐渐显现出局限性。针对这一问题,提出基于高效视频编码(High Efficiency Video Coding,HEVC)技术的优化策略,以期改善直播电视信号的压缩效率、传输延迟及画质清晰度。实验结果表明,HEVC技术结合快速用户数据报协议互联网连接(Quick User Datagram Protocol Internet Connections,QUIC)协议和硬件加速技术,可显著提高高分辨率场景下的信号稳定性和实时性。展开更多
随着移动互联网逐步向万物互联的6G迈进,构建天空地一体化融合网络成为未来网络发展的必然方向。卫星互联网具有高、广、远的优势,无疑是6G网络不可或缺组成部分。传输控制协议是卫星互联网的关键技术之一,也是实现端到端高效传输的关键...随着移动互联网逐步向万物互联的6G迈进,构建天空地一体化融合网络成为未来网络发展的必然方向。卫星互联网具有高、广、远的优势,无疑是6G网络不可或缺组成部分。传输控制协议是卫星互联网的关键技术之一,也是实现端到端高效传输的关键。QUIC(Quick UDP Internet Connection)是为应对传统TCP协议的诸多不足而提出的新型传输协议,一经提出就引起了学术界和工业界广泛关注。简要介绍卫星互联网组成结构的基础上,梳理空间环境对传统TCP议带来的长时延、高误码、高抖动以及移动性等诸多挑战,分析QUIC的核心机理、关键优势以及对卫星互联网的适应性,最后通过仿真结果验证了QUIC协议对空间环境的适应性,以期为其推广应用提供有价值的参考。展开更多
In recent years, we need more bandwidth to enjoy entertainment contents such as video streaming, music and online gaming. To gain enough bandwidth, technologies that combine bandwidth by using multiple interfaces at s...In recent years, we need more bandwidth to enjoy entertainment contents such as video streaming, music and online gaming. To gain enough bandwidth, technologies that combine bandwidth by using multiple interfaces at same time are desired. Multipath transport protocols which combine multiple paths for packet delivery at the transport layer are a promising technology. Such protocols have a mechanism, called “packet scheduler”, to select the interface to send a packet. However, existing studies of the packet scheduler have not explicitly considered the compatibility of mobility with bonding of bandwidth. Therefore, when smartphone users move out of coverage of communication networks such as wireless Local Area Network (LAN) and Long Term Evolution (LTE) by vehicle, packet loss occurs, leading to a decrease of throughput. In this study, we propose a packet scheduler that selects an appropriate communication path so that packets can reach the peer before it moves out of the coverage. Based on routes of a vehicle and the position and communication range of the access point, the time at which a communication path will be lost is predicted. In addition, we employ MPQUIC (Multipath QUIC (Quick UDP Internet Connections)), which is a multipath transport protocol proposed as the extension of QUIC protocol, to reduce the ACK packet loss in multipath communication, and to reduce the time until the starts of retransmission. We evaluated the number of packet losses, the throughput and the time until starts of retransmission using a simulator and show the superiority of proposed method.展开更多
In the vast majority of mobile applications, the Transmission Control Protocol (TCP) is still leveraged at the transport layer of the Internet’s protocol stack. But, in many cases, the performance of TCP over mobile ...In the vast majority of mobile applications, the Transmission Control Protocol (TCP) is still leveraged at the transport layer of the Internet’s protocol stack. But, in many cases, the performance of TCP over mobile networks has been proven sub-optimal in practice, thus causing substantial bottlenecks. Quick UDP Internet Connections (QUIC) is a new protocol, currently being standardized by the Internet Engineering Task Force (IETF), that aims at solving some of the inherent problems of TCP. The purpose of this paper is to provide a comprehensive overview of QUIC and compare the performance of QUIC and TCP in wireless networks. To compare QUIC with TCP under various transmission scenarios over LTE networks, the ns-3 network simulator has been employed. The simulations performed showed that 1) under good or average transmission conditions, QUIC is characterized by a better steady state throughput at the same time achieving quite lower file download times;and 2) under poor transmission conditions, the two protocols exhibit a similar performance.展开更多
【目的】随着互联网时代的到来,交通行业对数据通信的要求不断提高,加上车联网技术的发展带来大量数据,交通大数据的高速传输需求与有限的网络传输性能之间的矛盾日益增加。【方法】针对这一问题,本文在分析国内外车联网通信以及传输协...【目的】随着互联网时代的到来,交通行业对数据通信的要求不断提高,加上车联网技术的发展带来大量数据,交通大数据的高速传输需求与有限的网络传输性能之间的矛盾日益增加。【方法】针对这一问题,本文在分析国内外车联网通信以及传输协议研究现状的基础上,结合车联网文件传输方面的应用需求,研究提出了一套基于QUIC(Quick UDP Internet Connection)协议的文件多流并行传输机制,对大数据文件进行压缩、分块、并行传输以及聚合。【结果】本文设计实现了一套面向交通大数据的高速文件传输系统,全面提升了数据传输的性能。【结论】实际的大数据文件传输实验结果表明,本系统在复杂网络环境下,传输效率显著优于传统的文件传输系统。展开更多
With the reduction in manufacturing and launch costs of low Earth orbit satellites and the advantages of large coverage and high data transmission rates,satellites have become an important part of data transmission in...With the reduction in manufacturing and launch costs of low Earth orbit satellites and the advantages of large coverage and high data transmission rates,satellites have become an important part of data transmission in air-ground networks.However,due to the factors such as geographical location and people’s living habits,the differences in user’demand for multimedia data will result in unbalanced network traffic,which may lead to network congestion and affect data transmission.In addition,in traditional satellite network transmission,the convergence of network information acquisition is slow and global network information cannot be collected in a fine-grained manner,which is not conducive to calculating optimal routes.The service quality requirements cannot be satisfied when multiple service requests are made.Based on the above,in this paper artificial intelligence technology is applied to the satellite network,and a software-defined network is used to obtain the global network information,perceive network traffic,develop comprehensive decisions online through reinforcement learning,and update the optimal routing strategy in real time.Simulation results show that the proposed reinforcement learning algorithm has good convergence performance and strong generalizability.Compared with traditional routing,the throughput is 8%higher,and the proposed method has load balancing characteristics.展开更多
文摘Tor网络作为最受欢迎的匿名网络之一,使用TCP协议作为传输层协议,这一选择导致了行首阻塞、带宽分配不公平以及低效的拥塞控制等问题,严重影响了Tor网络的性能和扩展性。目前有研究使用QUIC协议的Tor Over QUIC模式来解决这些问题。然而,Tor Over QUIC模式下性能评估指标单一,仅聚焦在时延和安全性评估,难以全面反映协议升级对匿名网络核心特性的综合影响,导致协议优化方向不明确且部署决策缺乏数据支撑。这种评估维度缺失不仅制约了QUIC协议优势的充分发挥,更可能因性能短板影响用户采用意愿,容易影响Tor Over QUIC的推广与使用。因此,提出了一种基于Tor Over QUIC的多维度性能评估方法,从时延、匿名性、安全性、鲁棒性和可用性等多个维度对Tor Over QUIC模式下的性能进行综合评估,以指导Tor Over QUIC的部署与使用。对Tor网络和Tor Over QUIC网络进行的对比实验表明,所提评估方法是有效且实用的。
文摘随着移动互联网的快速发展,实时场景类移动应用(APP,APPLICATION)都具有实时消息处理和分发能力;而移动互联网会出现高延时、高丢包率的弱网环境,严重影响用户的使用体验;分析了当前实时消息处理系统的一般网络架构和传输控制协议(TCP,Transmission Control Protocol)的性能瓶颈;进一步分析了快速UDP互联网连接(QUIC,Quick UDP Internet Connections)协议的机制和特性;提出并实现了以QUIC协议为基础的实时消息处理系统;最后在模拟弱网环境下对QUIC和TCP协议进行对比性能测试,测试结果表明基于QUIC协议的实现方案在弱网环境下性能有较明显的优势。
文摘QUIC是由Google提出的用于替代TCP(Transmission Control Protocol)的互联网数据传输协议.它引入了许多新的特性,从而在理论上拥有比TCP更好的性能.例如,它通过多路传输解决了队头阻塞问题,通过0-RTT握手降低了传输层握手延时,以及通过连接迁移更好地对移动性提供支持.但是,现实生活中的网络环境和终端设备是多样性的,并且互联网中存在着各种各样的攻击,所以QUIC在实际网络中的表现可能并不如预期.因此,探究QUIC对现有网络服务的影响是一项很重要的工作.首先介绍了QUIC的发展历史及其主要特性,并以目前使用最为广泛的2个应用场景——网页浏览和视频传输——为例,介绍并总结了国内外对QUIC在不同网络环境下的传输性能的研究分析.随后,从协议设计和系统设计2个方面列举了目前已有的对QUIC的优化工作,并对现有的对QUIC安全性分析的相关工作进行总结,还列举了目前学术界公认的QUIC所存在的安全性问题以及研究者为解决此类问题所作出的努力.最后,对现有研究成果可能的进一步提高之处进行了总结,并对QUIC带来的新的研究课题及其挑战进行了展望.
文摘随着高清和超高清直播需求的增长,传统编码技术在压缩效率和传输质量方面逐渐显现出局限性。针对这一问题,提出基于高效视频编码(High Efficiency Video Coding,HEVC)技术的优化策略,以期改善直播电视信号的压缩效率、传输延迟及画质清晰度。实验结果表明,HEVC技术结合快速用户数据报协议互联网连接(Quick User Datagram Protocol Internet Connections,QUIC)协议和硬件加速技术,可显著提高高分辨率场景下的信号稳定性和实时性。
文摘随着移动互联网逐步向万物互联的6G迈进,构建天空地一体化融合网络成为未来网络发展的必然方向。卫星互联网具有高、广、远的优势,无疑是6G网络不可或缺组成部分。传输控制协议是卫星互联网的关键技术之一,也是实现端到端高效传输的关键。QUIC(Quick UDP Internet Connection)是为应对传统TCP协议的诸多不足而提出的新型传输协议,一经提出就引起了学术界和工业界广泛关注。简要介绍卫星互联网组成结构的基础上,梳理空间环境对传统TCP议带来的长时延、高误码、高抖动以及移动性等诸多挑战,分析QUIC的核心机理、关键优势以及对卫星互联网的适应性,最后通过仿真结果验证了QUIC协议对空间环境的适应性,以期为其推广应用提供有价值的参考。
文摘In recent years, we need more bandwidth to enjoy entertainment contents such as video streaming, music and online gaming. To gain enough bandwidth, technologies that combine bandwidth by using multiple interfaces at same time are desired. Multipath transport protocols which combine multiple paths for packet delivery at the transport layer are a promising technology. Such protocols have a mechanism, called “packet scheduler”, to select the interface to send a packet. However, existing studies of the packet scheduler have not explicitly considered the compatibility of mobility with bonding of bandwidth. Therefore, when smartphone users move out of coverage of communication networks such as wireless Local Area Network (LAN) and Long Term Evolution (LTE) by vehicle, packet loss occurs, leading to a decrease of throughput. In this study, we propose a packet scheduler that selects an appropriate communication path so that packets can reach the peer before it moves out of the coverage. Based on routes of a vehicle and the position and communication range of the access point, the time at which a communication path will be lost is predicted. In addition, we employ MPQUIC (Multipath QUIC (Quick UDP Internet Connections)), which is a multipath transport protocol proposed as the extension of QUIC protocol, to reduce the ACK packet loss in multipath communication, and to reduce the time until the starts of retransmission. We evaluated the number of packet losses, the throughput and the time until starts of retransmission using a simulator and show the superiority of proposed method.
文摘In the vast majority of mobile applications, the Transmission Control Protocol (TCP) is still leveraged at the transport layer of the Internet’s protocol stack. But, in many cases, the performance of TCP over mobile networks has been proven sub-optimal in practice, thus causing substantial bottlenecks. Quick UDP Internet Connections (QUIC) is a new protocol, currently being standardized by the Internet Engineering Task Force (IETF), that aims at solving some of the inherent problems of TCP. The purpose of this paper is to provide a comprehensive overview of QUIC and compare the performance of QUIC and TCP in wireless networks. To compare QUIC with TCP under various transmission scenarios over LTE networks, the ns-3 network simulator has been employed. The simulations performed showed that 1) under good or average transmission conditions, QUIC is characterized by a better steady state throughput at the same time achieving quite lower file download times;and 2) under poor transmission conditions, the two protocols exhibit a similar performance.
文摘【目的】随着互联网时代的到来,交通行业对数据通信的要求不断提高,加上车联网技术的发展带来大量数据,交通大数据的高速传输需求与有限的网络传输性能之间的矛盾日益增加。【方法】针对这一问题,本文在分析国内外车联网通信以及传输协议研究现状的基础上,结合车联网文件传输方面的应用需求,研究提出了一套基于QUIC(Quick UDP Internet Connection)协议的文件多流并行传输机制,对大数据文件进行压缩、分块、并行传输以及聚合。【结果】本文设计实现了一套面向交通大数据的高速文件传输系统,全面提升了数据传输的性能。【结论】实际的大数据文件传输实验结果表明,本系统在复杂网络环境下,传输效率显著优于传统的文件传输系统。
基金supported by the National Natural Science Foundation of China(No.U21A20451)the Science and Technology Planning Project of Jilin Province,China(No.20220101143JC)the China University Industry-Academia-Research Innovation Fund(No.2021FNA01003)。
文摘With the reduction in manufacturing and launch costs of low Earth orbit satellites and the advantages of large coverage and high data transmission rates,satellites have become an important part of data transmission in air-ground networks.However,due to the factors such as geographical location and people’s living habits,the differences in user’demand for multimedia data will result in unbalanced network traffic,which may lead to network congestion and affect data transmission.In addition,in traditional satellite network transmission,the convergence of network information acquisition is slow and global network information cannot be collected in a fine-grained manner,which is not conducive to calculating optimal routes.The service quality requirements cannot be satisfied when multiple service requests are made.Based on the above,in this paper artificial intelligence technology is applied to the satellite network,and a software-defined network is used to obtain the global network information,perceive network traffic,develop comprehensive decisions online through reinforcement learning,and update the optimal routing strategy in real time.Simulation results show that the proposed reinforcement learning algorithm has good convergence performance and strong generalizability.Compared with traditional routing,the throughput is 8%higher,and the proposed method has load balancing characteristics.
