共查询到19条相似文献,搜索用时 187 毫秒
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在阐述TCP/IP分层模型的基础上,分析了基于TCP/IP协议的数据及其流向,并全面地剖析了TCP/IP的路由寻径原理, 相似文献
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本文介绍了TCP/IP网际互连中数据报路由控制的原理、协议以及在工程应用中网际路由控制的方法和关键技术。 相似文献
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文中研究了利用卫星移动通信支持网络移动的必要性,提出了利用卫星移动通信网扩展地面IP网覆盖范围的设想和实现方案,分析了该方案的特点及需要解决的关键技术问题,重点分析了卫星移动信道对TCP/IP协议的影响及网络移动过程中的连接和路由选择问题,卫星移动信道误码率、往返时延、变化率、信道不对称性及信道频繁通断对TCP/IP协议工作效率的影响,以及提供网络移动应解决的双重隧道问题。 相似文献
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流量/拥塞控制的基本目的是以分布处理的方式有效地控制结点间的数据流,从而避免网络中出现拥塞。拥塞控制相应的控制策略称为拥塞控制算法(协议)。简述了Internet上基于TCP/IP的拥塞控制机制,分析和比较了TCP/IP上具体实现算法的稳定性,讨论了TCP/IP拥塞控制所面临的问题。 相似文献
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为提高多媒体通信吞吐量,降低端与端传输延时,开展基于带宽预测的多媒体通信路由拥塞节点调度方法设计研究。将TCP/IP协议作为传输指令,建立多媒体通信路由节点通信模型;根据拥塞情况,预测通信过程中的链路带宽,计算通信路由节点有效传输量;引进QOS协商机制,控制节点流量,并结合不同节点的状态量,进行调度设计。实验证明,提出的方法有效提升多媒体通信路由吞吐量,降低通信过程延时,进一步提高通信数据传输速率。 相似文献
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TCP/IP网络中有一些路由选择和流量控制方法只能保证系统局部最优。本文引入现代控制理论,提出通过对TCP/IP数据通信网非一状态控制模型进行线性近似,并借助李亚普诺夫原理的途径判所能信网整体稳定性的方法在稳定性的基础上,证明了数据网最优控制可以具有路由最短和路由不形成环路等性质。 相似文献
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航天测控网是用于支持飞行器试验任务的数据获取、传输、处理的信息网络,网内的测控数据在站点间传输时大部分是通过卫通信道完成的。为了适应通信技术的发展,测近代数据通信网开始考虑采用TCP/IP协议簇实现数据的远程传输。但是,由于卫星通信的一些特殊性,TCP传输应用于卫星通信环境 相似文献
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《Wireless Communications, IEEE Transactions on》2003,2(5):901-910
This paper presents an analytical method of optimal breaking of a transmission control protocol (TCP)/Internet protocol (IP) message into medium access control (MAC) packets in networks without cut-through routing (such as networks compliant with the IEEE 802.11 wireless local area network standard). The method accounts for the transmission delay of acknowledgement frames, the sliding window flow control in TCP/IP protocol, error control via retransmissions, and heterogeneity of transport parameters (link-to-link and upstream-downstream) along a multihop network path. Mathematically, the problem consists in minimizing the TCP/IP message transaction time, a nonlinear function of the MAC packet size, in the presence of a set of linear restrictions. Throughput calculations illustrating this method are performed using IEEE 802.11 data. 相似文献
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TCP/IP网络的动态模型描述 总被引:2,自引:0,他引:2
拥塞现象成为TCP/IP网络发展面临的一个重要问题。因此,拥塞控制对TCP/IP网络的鲁棒性和稳定性具有重要作用。目前,网络拥塞控制策略主要包括两类:端到端的控制机制,如TCP拥塞控制算法;网络内部的主动队列管理(AQM)策略。但由于缺乏对网络系统动态特性的了解,这些拥塞控制策略大都基于专家经验,并没有建立完整的理论分析框架。为此,本文从数据流的角度出发,通过建立网络基本单元状态方程模型来实现IP网络系统的数学解析模型,然后用混杂系统来描述TCP带有拥塞控制策略的数据传输过程,建立了TCP/IP网络的动态模型,为网络系统中动态性能的分析、拥塞控制策略的设计奠定了基础。实验结果表明,该数学模型与NS仿真实验的结果相一致。 相似文献
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Wireless is becoming a popular way to connect mobile computers to the Internet and other networks. The bandwidth of wireless
links will probably always be limited due to properties of the physical medium and regulatory limits on the use of frequencies
for radio communication. Therefore, it is necessary for network protocols to utilize the available bandwidth efficiently.
Headers of IP packets are growing and the bandwidth required for transmitting headers is increasing. With the coming of IPv6
the address size increases from 4 to 16 bytes and the basic IP header increases from 20 to 40 bytes. Moreover, most mobility
schemes tunnel packets addressed to mobile hosts by adding an extra IP header or extra routing information, typically increasing
the size of TCP/IPv4 headers to 60 bytes and TCP/IPv6 headers to 100 bytes. In this paper, we provide new header compression
schemes for UDP/IP and TCP/IP protocols. We show how to reduce the size of UDP/IP headers by an order of magnitude, down to
four to five bytes. Our method works over simplex links, lossy links, multi‐access links, and supports multicast communication.
We also show how to generalize the most commonly used method for header compression for TCP/IPv4, developed by Jacobson, to
IPv6 and multiple IP headers. The resulting scheme unfortunately reduces TCP throughput over lossy links due to unfavorable
interaction with TCP's congestion control mechanisms. However, by adding two simple mechanisms the potential gain from header
compression can be realized over lossy wireless networks as well as point‐to‐point modem links.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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WiMedia, Wi-Fi, WiMax, Wi-Mobile, WiRAN, the Wi-family is getting bigger; so does the network architecture. It is encouraging
to see the fast development of the new IEEE wireless technologies promising the ultimate Internet service deployment on wireless
and mobile infrastructures since they would offer larger bandwidth at cheaper price compared to the telecommunication wireless
radio resource. However it is disquieting to see that the TCP/IP protocol stack which is supposed to be the heart of the Internet
services deployment is not evolving as fast as the wireless technologies do. Here we come up with the hard question which
is the network performance of the TCP/IP architecture over wireless networks. It is probably too early to decide to replace
TCP/IP by another protocol stack for wireless network support, but it is important to not ignore the problem and analyse the
main drawbacks of TCP/IP in wireless networks and think about a new architecture of network communication over the wireless
networks.
This paper provides a brief survey of what we name here the Wi-family wireless technologies, and emphasizes on new network
architecture to optimize the TCP/IP behaviour worsen by the wireless characteristics. 相似文献
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Mobile IP is a standard for handling routing for hosts that have moved from their home network. This paper studies the costs of the Mobile IP handoff that occurs when a mobile host moves between networks. Experiments were carried out with Mobile IP and TCP over varying network conditions to observe the effect of handoffs on the transmission. This paper shows that although Mobile IP may be appropriate for current applications, its long handoff periods make it unsuitable for the future. 相似文献
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传统的TCP/IP路由以IP地址为中心,信息传输效率低下,难以满足网络用户需求。信息中心网络(Information-Centric Network,ICN)开始成为研究热点,ICN以内容为中心,可以高效传输信息。为了利用软件定义网络(Software Defined Network,SDN)和分段路由技术的优势,提高SDN控制器效率,减少网络传输时延,提出了一种可以应用于ICN的集中式架构。为进一步利用无标度网络对ICN进行建模,提出了一种基于数控分离的自适应概率路由算法。该算法通过迭代的方法调节数据包在节点发送的概率,使网络获取更佳性能。仿真结果表明,与最短路径算法和效率路由算法相比,该算法可以提升网络容量,有效降低平均路径长度。 相似文献
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计算机网络的路由算法 总被引:1,自引:0,他引:1
本文首先介绍OSI网络层及其路由的基本概念,功能,然后着重介绍路由选择Dijksra算法,并讨论了基于这一路由算法的目前在TCP/IP网络环境(如INTERNET)中的路由协议OSPE,最后对OSI路由协议相关概念及目前发展情况作了简单介绍。 相似文献
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由于TCP/IP协议非常简单且可靠,所以它们的组合决定了目前的大多数通信方式(从有线骨干网到混合网)。现在TCP协议已经成为大多数应用事实上的标准。TCP协议最初是为有线网络而设计的。在有线网络中随机比特差错率是可以忽略的。拥塞主要是由包丢失造成的。很多研究都表明未修改的标准TCP协议在无线环境中的性能是很差的,因为它无法区分出数据包的丢失是由于拥塞还是传输差错。分析了TCP在无线IP通信环境中存在的问题,并详细给出相应的解决方案。 相似文献