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TCP/AWM网络系统的事件触发预设性能拥塞控制
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作者 谢海修 井元伟 《控制理论与应用》 EI CAS CSCD 北大核心 2023年第3期450-458,共9页
研究了具有非响应用户数据报协议流干扰的TCP/AWM网络系统的跟踪控制问题.针对网络拥塞控制系统,给出了一种改进的网络模型.将预设性能控制和事件触发机制相结合,提出了一种新的AWM拥塞控制算法.利用改进的边界性能函数限制TCP/AWM网络... 研究了具有非响应用户数据报协议流干扰的TCP/AWM网络系统的跟踪控制问题.针对网络拥塞控制系统,给出了一种改进的网络模型.将预设性能控制和事件触发机制相结合,提出了一种新的AWM拥塞控制算法.利用改进的边界性能函数限制TCP/AWM网络系统的队列跟踪误差,提高了闭环系统的暂态和稳态性能,保证了所有闭环信号都是有界的.此外,采用基于一位信号传输的事件触发控制协议,当控制信号更新时,仅通过一个二进制信号(0或1)传输信息.与传统的事件触发控制协议相比,不仅考虑了有限的带宽,而且考虑了网络传输的成本以及安全性问题.最后,通过仿真验证和分析,证明了所提方法的可行性和优越性. 展开更多
关键词 tcp/awm网络 拥塞控制 预设性能控制 事件触发控制 一位信号传输
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TCP-LTE/5G Cross-layer performance analysis tool for high mobility data networking and a case study on high-speed railway
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作者 Ruihan Li Yueyang Pan +2 位作者 Xiangtian Ma Haotian Xu Chenren Xu 《High-Speed Railway》 2023年第2期141-146,共6页
Nowadays,high mobility scenarios have become increasingly common.The widespread adoption of High-speed Rail(HSR)in China exemplifies this trend,while more promising use cases,such as vehicle-to-everything,continue to ... Nowadays,high mobility scenarios have become increasingly common.The widespread adoption of High-speed Rail(HSR)in China exemplifies this trend,while more promising use cases,such as vehicle-to-everything,continue to emerge.However,the Internet access provided in high mobility environments stllstruggles to achieve seamless connectivity.The next generation of wireless cellular technology 5 G further poses more requirements on the endto-end evolution to fully utilize its ultra-high band-width,while existing network diagnostic tools focus on above-IP layers or below-IP layers only.We then propose HiMoDiag,which enables flexible online analysis of the network performance in a cross-layer manner,i.e.,from the top(application layer)to the bottom(physical layer).We believe HiMoDiag could greatly simplify the process of pinpointing the deficiencies of the Internet access delivery on HSR,lead to more timely optimization and ultimately help to improve the network performance. 展开更多
关键词 LTE 5G Cellular networks High mobility tcp network diagnostics High-speed railway
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工控网络Modbus TCP协议异常报文检测方法
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作者 张帆 高山 《微型电脑应用》 2024年第8期181-184,共4页
工业控制网络系统包含Modbus报文传输数据、TCP/IP主机通信行为数据、工控协议数据等大量复杂数据,容易造成数据冗余,降低异常报文检测精度,增加检测时间,从而增加工控网络被攻击几率。为此,提出一种基于支持向量机(SVM)的工控网络Modbu... 工业控制网络系统包含Modbus报文传输数据、TCP/IP主机通信行为数据、工控协议数据等大量复杂数据,容易造成数据冗余,降低异常报文检测精度,增加检测时间,从而增加工控网络被攻击几率。为此,提出一种基于支持向量机(SVM)的工控网络Modbus TCP协议异常报文检测方法。利用SVM建立工控网络分层数据模型,在应用层中定义Modbus协议报文,使用核函数对非平稳的随机Modbus协议报文进行离散处理,减少工控网络数据冗余。结合m阶马尔科夫序列,在TCP/IP数据链路层中对离散Modbus协议报文进行异常特征提取,完成Modbus报文异常检测。仿真测试结果表明:所提方法可以有效降低数据冗余,工控网络重复数据存储率为0.39%;Modbus TCP协议异常报文检测精度为95.73%;Modbus TCP协议异常报文检测时间为0.5 ms,以期为工控网络安全提供技术支持。 展开更多
关键词 工业控制网络 Modbus报文 tcp/IP SVM m阶马尔科夫序列
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TCP/AWM网络系统的H∞拥塞跟踪控制 被引量:1
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作者 井元伟 亓雪蕾 +1 位作者 申金栋 井江山 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2020年第10期1388-1393,共6页
对于TCP/AWM网络系统拥塞跟踪控制问题,提出了一种基于AWM机制的拥塞控制策略设计思想.针对网络系统的非线性模型,采用坐标变换将其转化为具有下三角结构的误差模型.采用backstepping技术设计了H∞控制器.考虑到系统中存在UDP流干扰的情... 对于TCP/AWM网络系统拥塞跟踪控制问题,提出了一种基于AWM机制的拥塞控制策略设计思想.针对网络系统的非线性模型,采用坐标变换将其转化为具有下三角结构的误差模型.采用backstepping技术设计了H∞控制器.考虑到系统中存在UDP流干扰的情况,设计了H∞性能函数,对干扰起到良好的抑制作用,将backstepping技术与H∞性能函数相结合得到了误差系统稳定的充分条件.仿真结果表明,所提控制方法可以快速稳定队列长度,并且在UDP流占据接近一半的链路带宽时依然有效. 展开更多
关键词 tcp/awm网络 拥塞控制 主动窗口管理 下三角结构 H∞控制
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TCP-ATCA: Improved Transmission Control Algorithm in Satellite Network
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作者 刘锋 刘衡娜 赵寒 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2008年第2期155-161,共7页
An adaptive transmission control algorithm based on TCP (TCP-ATCA) is proposed to reduce the effects of long propagation delay and high link error rate of the satellite network on the performances. The flow control ... An adaptive transmission control algorithm based on TCP (TCP-ATCA) is proposed to reduce the effects of long propagation delay and high link error rate of the satellite network on the performances. The flow control and the error recovery are differentiated by combined dynamic random early detection-explicit congestion notification (DRED-ECN) algorithm, and, moreover, the pertaining congestion control methods are used in TCP-ATCA to improve the throughput. By introducing the entire recovery algorithm, the unnecessary congestion window decrease is reduced, and the throughput and fairness are improved. Simulation results show that, compared with TCP-Reno, TCP-ATCA provides a better throughput performance when the link capacity is higher ( ≥600 packet/s), and roughly the same when it is lower. At the same time, TCP-ATCA also increases fairness and reduces transmission delay. 展开更多
关键词 congestion control tcp protocol satellite network
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TCP/AWM网络系统的自适应有限时间漏斗拥塞控制
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作者 井元伟 谢海修 白云 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2022年第10期1369-1375,共7页
研究了具有外部扰动的TCP/AWM网络系统拥塞控制问题.首先,为了保证队列跟踪误差具有预设的暂态和稳态性能,引入漏斗误差变换对队列跟踪误差进行限制.其次,利用RBF神经网络处理系统中存在的非线性项.结合漏斗控制、有限时间控制、自适应B... 研究了具有外部扰动的TCP/AWM网络系统拥塞控制问题.首先,为了保证队列跟踪误差具有预设的暂态和稳态性能,引入漏斗误差变换对队列跟踪误差进行限制.其次,利用RBF神经网络处理系统中存在的非线性项.结合漏斗控制、有限时间控制、自适应Backstepping技术和RBF神经网络,提出了一种主动窗口管理算法,不仅保证了闭环系统的所有信号是半全局实际有限时间有界的,还使队列跟踪误差收敛到预先给定的漏斗边界内.最后,将本文所提方法与现有的两种同类算法进行了仿真对比,通过得到的仿真结果可以看出所设计的控制器使系统具有更快的收敛速度和更小的超调量,进一步验证了所提方法的可行性和优越性. 展开更多
关键词 tcp/awm网络 拥塞控制 漏斗边界 有限时间控制 RBF神经网络
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基于LwIP和Modbus TCP协议的网络控制器设计 被引量:2
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作者 史先传 殷帅 许议元 《自动化与仪表》 2023年第2期19-24,共6页
为了实现对终端设备的网络远程控制和监测,该文设计了一款基于LwIP和Modbus TCP协议的网络控制器。该控制器以STM32F107RCT6和LAN9303芯片为核心,设计出了网络通信电路、网口电路、A/D采样电路、光耦隔离电路和IO口电路。软件设计主要... 为了实现对终端设备的网络远程控制和监测,该文设计了一款基于LwIP和Modbus TCP协议的网络控制器。该控制器以STM32F107RCT6和LAN9303芯片为核心,设计出了网络通信电路、网口电路、A/D采样电路、光耦隔离电路和IO口电路。软件设计主要完成了LwIP协议栈的移植、Modbus TCP协议程序和其他控制程序的编写。经过测试,所设计的网络控制器在对设备进行远程控制和监测时具有数据传输可靠、通讯稳定和实时性好的优点,能满足工厂使用。 展开更多
关键词 LWIP协议 Modbus tcp协议 STM32F107RCT6 LAN9303 网络控制
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A Real-Time TCP Stream Reassembly Mechanism in High-Speed Network 被引量:3
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作者 熊兵 陈晓苏 陈宁 《Journal of Southwest Jiaotong University(English Edition)》 2009年第3期185-191,共7页
With the continual growth of the variety and complexity of network crime means, the traditional packet feature matching cannot detect all kinds of intrusion behaviors completely. It is urgent to reassemble network str... With the continual growth of the variety and complexity of network crime means, the traditional packet feature matching cannot detect all kinds of intrusion behaviors completely. It is urgent to reassemble network stream to perform packet processing at a semantic level above the network layer. This paper presents an efficient TCP stream reassembly mechanism for real-time processing of high-speed network traffic. By analyzing the characteristics of network stream in high-speed network and TCP connection establishment process, several polices for designing the reassembly mechanism are built. Then, the reassembly implementation is elaborated in accordance with the policies. Finally, the reassembly mechanism is compared with the traditional reassembly mechanism by the network traffic captured in a typical gigabit gateway. Experiment results illustrate that the reassembly mechanism is efficient and can satisfy the real-time property requirement of traffic analysis system in high-speed network. 展开更多
关键词 tcp stream reassembly High-speed network Real-time property Reassembly policy
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A Novel Onboard-gateway-based Mechanism to Improve TCP Performance in Aeronautical Satellite Networks 被引量:1
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作者 GU Ming ZHANG Jun 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2007年第3期260-265,共6页
The IP-based networks on aircraft serve to support Intemet services via satellites. However, in aeronautical satellite hybrid networks, the TCP protocol performance often deteriorates due to improper decreases and slo... The IP-based networks on aircraft serve to support Intemet services via satellites. However, in aeronautical satellite hybrid networks, the TCP protocol performance often deteriorates due to improper decreases and slow recovery of the congestion window. This paper proposes a window size determination and notification mechanism, onboard-gateway-based mechanism (OGBM), which is based on the onboard gateway in the networks on aircraft. A cross-layer approach is adopted by the onboard gateway to obtain the satellite link bandwidth information. And then, by the gateway, through changing the receiver's advertised window field in ACK packets, TCP sources are notified of the window size of each TCP source calculated on the ground of bandwidth delay product and flow numbers. The mechanism is able to avoid improper changes of TCP window and serve multiple users. Simulation results show that the mechanism with the fairness index close to l improves TCP performance in aeronautical satellite networks. 展开更多
关键词 congestion control tcp GATEWAY aeronautical satellite network
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Using TCP/IP Programming to Realize the Communication among Different Network Platforms 被引量:1
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作者 ZHANGChang-li SHENWei-zheng FANGJun-long 《Journal of Northeast Agricultural University(English Edition)》 CAS 2004年第1期77-79,共3页
This paper mainly introduces about how to use socket to design network program which can transfer data in different network platform in terms of TCP/IP Network Programming Standard.
关键词 tcp/IP SOCKET network Programming
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Modelling and Analysis of TCP Performance in Wireless Multihop Networks 被引量:2
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作者 Hannan Xiao Ying Zhang +2 位作者 James Malcolm Bruce Christianson Kee Chaing Chua 《Wireless Sensor Network》 2010年第7期493-503,共11页
Researchers have used extensive simulation and experimental studies to understand TCP performance in wireless multihop networks. In contrast, the objective of this paper is to theoretically analyze TCP performance in ... Researchers have used extensive simulation and experimental studies to understand TCP performance in wireless multihop networks. In contrast, the objective of this paper is to theoretically analyze TCP performance in this environment. By examining the case of running one TCP session over a string topology, a system model for analyzing TCP performance in multihop wireless networks is proposed, which considers packet buffering, contention of nodes for access to the wireless channel, and spatial reuse of the wireless channel. Markov chain modelling is applied to analyze this system model. Analytical results show that when the number of hops that the TCP session crosses is ?xed, the TCP throughput is independent of the TCP congestion window size. When the number of hops increases from one, the TCP throughput decreases ?rst, and then stabilizes when the number of hops becomes large. The analysis is validated by comparing the numerical and simulation results. 展开更多
关键词 Wireless MULTIHOP networkS tcp MODELLING tcp AD HOC networkS
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Incorporating Network Coding into TCP Grounded on Network Utility Maximization in Multi-Radio Multi-Channel Wireless Mesh Networks 被引量:1
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作者 Liu Hongquan Gu Yuantao 《China Communications》 SCIE CSCD 2012年第6期28-35,共8页
A new approach, named TCP-I2NC, is proposed to improve the interaction between network coding and TCP and to maximize the network utility in interference-free multi-radio multi-channel wireless mesh networks. It is gr... A new approach, named TCP-I2NC, is proposed to improve the interaction between network coding and TCP and to maximize the network utility in interference-free multi-radio multi-channel wireless mesh networks. It is grounded on a Network Utility Maxmization (NUM) formulation which can be decomposed into a rate control problem and a packet scheduling problem. The solutions to these two problems perform resource allocation among different flows. Simulations demonstrate that TCP-I2NC results in a significant throughput gain and a small delay jitter. Network resource is fairly allocated via the solution to the NUM problem and the whole system also runs stably. Moreover, TCP-I2NC is compatible with traditional TCP variants. 展开更多
关键词 network utility maximization net-work coding wireless mesh network tcp
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Modeling TCP Incast Issue in Data Center Networks and an Adaptive Application-Layer Solution
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作者 Jin-Tang Luo Jie Xu Jian Sun 《Journal of Electronic Science and Technology》 CAS CSCD 2018年第1期84-91,共8页
In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side a... In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side application. Towards this goal, we first develop an analytical model that formulates the incast probability as a function of connection variables and network environment settings. We combine the model with the optimization theory and derive some insights into minimizing the incast probability through tuning connection variables related to applications. Then,enlightened by the analytical results, we propose an adaptive application-layer solution to the TCP incast.The solution equally allocates advertised windows to concurrent connections, and dynamically adapts the number of concurrent connections to the varying conditions. Simulation results show that our solution consistently eludes incast and achieves high goodput in various scenarios including the ones with multiple bottleneck links and background TCP traffic. 展开更多
关键词 Application-layer solution data center networks MODELING transmission control protocol(tcp) incast
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Performance Enhancement and Utility Maximization for TCP in Wireless Mesh Networks
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作者 Liu Hongquan Chen Jiong +1 位作者 Song Siming Gu Yuantao 《China Communications》 SCIE CSCD 2012年第4期35-44,共10页
In Wireless Mesh Networks (WMNs),the performance of conventional TCP significantly deteriorates due to the unreliable wireless channel.To enhance TCP performance in WMNs,TCP/LT is proposed in this paper.It introduces ... In Wireless Mesh Networks (WMNs),the performance of conventional TCP significantly deteriorates due to the unreliable wireless channel.To enhance TCP performance in WMNs,TCP/LT is proposed in this paper.It introduces fountain codes into packet reorganization in the protocol stack of mesh gateways and mesh clients.Furthermore,it is compatible with conventional TCP.Regarded as a Performance Enhancement Proxies (PEP),a mesh gateway buffers TCP packets into several blocks.It simultaneously processes them by using fountain encoders and then sends them to mesh clients.Apart from the improvement of the throughput of a unitary TCP flow,the entire network utility maximization can also be ensured by adjusting the scale of coding blocks for each TCP flow adaptively.Simulations show that TCP/LT presents high throughput gains over single TCP in lossy links of WMNs while preserving the fairness for multiple TCPs.As losses increase,the transmission delay of TCP/LT experiences a slow linear growth in contrast to the exponential growth of TCP. 展开更多
关键词 tcp tcp/LT fountain codes wireless mesh networks network utility maximization
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TCP Upload and Download Fairness over IEEE 802.11 Wired-cum-Wireless Heterogeneous Networks
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作者 任伟 金海 《Journal of Southwest Jiaotong University(English Edition)》 2007年第2期89-95,共7页
A scheme of setting a limit to the TCP sending window size is proposed to improve the TCP fairness between upload and/or download flows in wired-cum-wireless networks. The goodput and delay of the upload and download ... A scheme of setting a limit to the TCP sending window size is proposed to improve the TCP fairness between upload and/or download flows in wired-cum-wireless networks. The goodput and delay of the upload and download TCP flows arc compared to evaluate the TCP fairness for different schemes, which are the different combinations of setting a limit (64 or 4) to the sending window size and using the delayed acknowledgement (ACK) scheme or not. Extensive simulation results and analysis show that ( 1 ) for TCP download flows, setting the limit of sending window size to 4 can improve the fairness; (2) for TCP upload flows, limiting the sending window size and using the delayed ACK strategy are both beneficial to fairness; (3) for TCP download and upload mixture flows, limiting the sending window size to a small value ( e. g. , 4) rather than using the delayed ACK strategy, is the solution to improvement of the fairness ; (4) a large delay interval (200 ms or 300 ms) does not result in improvement in fairness and performance; ( 5 ) a larger TCP packet size ( 1400 B) can improve the TCP upload goodput and decrease the download goodput; in contrast, a smaller TCP packet size (560 B) can increase the download goodput and decrease the upload goodput. 展开更多
关键词 tcp fairness Wireless networks Heterogeneous networks Performance evaluation
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Experimental Evaluation of TCP and ICMP in Network Measurement
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作者 黎文伟 张大方 +1 位作者 谢高岗 杨金民 《Journal of Donghua University(English Edition)》 EI CAS 2005年第3期7-17,共11页
Network measurement is an important approach to understand network behaviors, which has been widely studied. Both Transfer Control Protocol (TCP) and Interact Control Messages Protocol (ICMP) are applied in networ... Network measurement is an important approach to understand network behaviors, which has been widely studied. Both Transfer Control Protocol (TCP) and Interact Control Messages Protocol (ICMP) are applied in network measurement, while investigating the differences between the measured results of these two protocols is an important topic that has been less investigated. In this paper, to compare the differences between TCP and ICMP when they are used in measuring host connectivity, RTT, and packet loss rate, two groups of comparison programs have been designed, and after careful evaluation of the program parameters, a lot of comparison experiments are executed on the Internet. The experimental results show that, there are significant differences between the host connectivity measured using TCP or ICMP; in general, the accuracy of connectivity measured using TCP is 20%- 30% higher than that measured using ICMP. The case of RTT and packet loss rate is complicated, which are related to path loads and destination host loads. While commonly, the RTF and packet loss rate" measured using TCP or ICMP are very close. According to the experimental results, some advices are also given on protocol selection for conducting accurate connectivity, RTF and packet loss rate measurements. 展开更多
关键词 network measurement network performance performance measurement tcp ICMP
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Split-TCP Based Acceleration Gateway over Packet Lossy Networks
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作者 DONG Pingping WANG Jianxin +1 位作者 HUANG Jiawei WANG Haodong 《China Communications》 SCIE CSCD 2015年第5期100-112,共13页
The conservative Additive Increase Multiplicative Decrease mechanism of traditional TCP causes the link under-utilization in the Wide Area Networks(WANs) due to the WANs' intrinsic nature of high latency and high ... The conservative Additive Increase Multiplicative Decrease mechanism of traditional TCP causes the link under-utilization in the Wide Area Networks(WANs) due to the WANs' intrinsic nature of high latency and high packet loss.To alleviate the problem,we present the design and implantation of STAG,an Acceleration Gateway with Split-TCP in the paper.STAG is built on embedded network equipment and acts as a transparent proxy.In STAG,a new improved congestion control method named Rapid TCP is adopted,which determines whether or not to decrease the congestion window based on the packet loss trend.In particular,in the fast recovery phase,it chooses different window adjustment strategies based on the current size of congestion window to achieve higher utilization.The performance validation of STAG is done on both our emulation testbed and the real wide area network.The results show that STAG with Rapid TCP effectively adapts to the high loss network environment and significantly speeds up the applications without loss of fairness. 展开更多
关键词 tcp acceleration gateway loss rate embedded network equipment
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改进BBR算法在卫星网TCP加速网关中的应用研究
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作者 王云飞 黄勇 +4 位作者 朱珊 孟祥宇 高二东 王占伟 郝晓强 《计算机应用与软件》 北大核心 2023年第1期163-166,共4页
研究卫星网络TCP加速网关中的拥塞控制算法,是TCP加速改进的一个重要方向,分析传统拥塞算法的不足,通过在加速网关中引入BBR(Bottleneck Bandwidth and RTT)算法,并加以改进。研究结果表明:改进后的BBR算法避免了探测最小RTT阶段窗口降... 研究卫星网络TCP加速网关中的拥塞控制算法,是TCP加速改进的一个重要方向,分析传统拥塞算法的不足,通过在加速网关中引入BBR(Bottleneck Bandwidth and RTT)算法,并加以改进。研究结果表明:改进后的BBR算法避免了探测最小RTT阶段窗口降到4个MSS的问题,这样拥塞窗口不会降到很低,依然能够满带宽发送,而且多个连接测试公平性良好。相比BBR,改进后的BBR速率有明显提升,可以满足卫星网络的加速需求。 展开更多
关键词 卫星网络 tcp加速网关 BBR RTT
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AN ENHANCEMENT SCHEME OF TCP PROTOCOL IN MOBILE AD HOC NETWORKS:MME-TCP
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作者 Kai Caihong Yu Nenghai Chen Yuzhong 《Journal of Electronics(China)》 2007年第1期1-9,共9页
Transmission Control Protocol (TCP) optimization in Mobile Ad hoc NETworks (MANETs) is a challenging issue because of some unique characteristics of MANETs. In this paper,a new end-to-end mechanism based on multiple m... Transmission Control Protocol (TCP) optimization in Mobile Ad hoc NETworks (MANETs) is a challenging issue because of some unique characteristics of MANETs. In this paper,a new end-to-end mechanism based on multiple metrics measurement is proposed to improve TCP performance in MANETs. Multi-metric Measurement based Enhancement of TCP (MME-TCP) designs the metrics and the identification algorithm according to the characteristics of MANETs and the experiment results. Furthermore,these metrics are measured at the sender node to reduce the overhead of control information over networks. Simulation results show that MME-TCP mechanism achieves a significant performance improvement over standard TCP in MANETs. 展开更多
关键词 Ad hoc networks Transmission Control Protocol tcp network states End-to-end metrics Identification algorithms
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TCP/IPsec Compatibility in Wireless Networks
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作者 Zhao Haiyang, Yang Yixian (Information Security Center, BUPT, Beijing 100876, China) 《ZTE Communications》 2005年第1期19-21,共3页
Transmission Control Protocol (TCP) was originally designed for wired networks. Many compatibility problems exist when it is applied to wireless environments, and hence it needs to undergo modifications. Currently, th... Transmission Control Protocol (TCP) was originally designed for wired networks. Many compatibility problems exist when it is applied to wireless environments, and hence it needs to undergo modifications. Currently, there are several TCP performance enhancement techniques for application of TCP in wireless environments, but all of them conflict with IPsec. This paper not only analyzes these conflicts, but also proposes 4 solutions: replacing IPsec with Transport Layer Security/Secure Socket Layer (TLS/SSL) protocol, adopting the extended Encapsulating Security Payload (ESP) protocol, segmenting the TCP route, and modifying the end-to-end protection mode of IPsec. It also presents their strengths and weaknesses. 展开更多
关键词 tcp/IPsec Compatibility in Wireless networks SECURITY IP IETF RFC ELN
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