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在未来的移动接入网中,点对点(Ad hoc)可以独立组网也可以与其它网络整合组网。大规模的独立Ad hoc网由于其在安全性、建设成本、传输性能等方面面临问题,不具有商业价值;小规模的Ad hoc网可以作为接入网与其他网络整合组网。文章提出了两种较为可行的整合方案,通过网关将小规模的Ad hoc网络与Internet和蜂窝网络整合,充分利用了Ad hoc网简单、灵活等优势。文章同时也对整合网络的研究现状和所面临的问题进行了总结。 相似文献
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一.Ad hoc网络。1.什么是Ad hoc网络Ad hoc网络是由一组带有无线收发装置的移动终端组成的一个多跳临时性自治系统,移动终端具有路由功能,可以通过无线连接构成任意的网络拓扑,这种网络可以独立工作,也可以与Internet或蜂窝无线网络连接。在后一种情况中,Ad hoc网络通常是以末端子网(树桩网络)的形式接入现有网络。 相似文献
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基于改进蚁群算法的Ad hoc路由协议的研究 总被引:1,自引:0,他引:1
现有Ad hoc网络路由协议技术研究中,路由稳定性和可靠性问题尚未得到很好解决,不能很好地适应Adhoc网络.针对已有Ad hoc路由技术中存在的开销大以及网络稳定性较低的问题,该文引入蚁群算法,并对其进行改进.研究基于改进蚂蚁算法的Ad hoc路由协议,并与比较成熟的AODV(Ad hoc On-Demand Distance Vector)进行对比.仿真实验结果表明,通过发挥网络中结点群体功能,新协议减小了端对端传输延时,改善了数据包传输成功率与协议开销,有效地提高了网络的稳定性和通信效率. 相似文献
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移动Ad hoc网络路由协议综述 总被引:2,自引:0,他引:2
摘要文章简单介绍移动Ad hoc网络,详细综述了移动Ad hoc网络中的各种路由协议.包括先验式路由协议、反应式路由协议和混合式路由协议,对它们进行了分类、对比和分析。提出了一个Ad hoc网络新型的路由协议的框架。最后,指出了移动Ad hoc路由协议的研究热点和展望。 相似文献
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本文研究了流控制传输协议(SCTP)作为一种新兴的传输层协议,在下一代网络(NGN)中的应用。重点分析了SCTP在移动Internet访问、无线异构网络的切换以及无线资源分配中相对于传统协议及方案的优势。 相似文献
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成卫青 《电气电子教学学报》2003,25(2):31-35
本文旨在扩充计算机网络课程的授课内容。流控制传输协议(SCTP),最初设计用于在IP网络上运输PSTN信令,现已作为互联网的一种新型运输层协议。SCTP可运行在IP之上,为用户提供可靠数据传送服务,并支持使用cookie机制的关联建立、多穴端点、多流、选择确认、流内有序和无序交付等新特性。文中主要阐述SCTP的体系结构、功能、应用,及其与两个主要的运输协议TCP和UDP的异同,可供教学参考。 相似文献
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The stream control transmission protocol (STCP) is being standardized by the IEFT as a reliable transport protocol to transport SS7signaling messages over IP networks. Due to its attractive features such as multistreaming and multihoming, SCTP has received much attention from the network community, in terms of both research and development. This article introduces the main features of SCTP, and discusses the state of the art in SCTP research and development activities. We also provide a survey of the available products that use SCTP. Finally with a view to stimulating further research in this area, the challenges faced by the SCTP research community are identified. 相似文献
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SCTP是为了在IP网络中传输基于消息的SS7信令而开发的传输层协议,它是可靠的,面向消息的协议。SCTP具有很多新的特点,在对SCTP的多数据流特性研究的基础上,提出使用多数据流特性进行WEB传输的机制,仿真结果的分析表明,使用SCTP来进行WEB的传输比TCP更加可靠,速度更快。 相似文献
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在基于IP的3G移动网络中,SIP将是主要的信令协议。IMS第五版本要求支持SIP的服务器具有拥塞控制能力。SCTP是为IP网传输电话信令而设计的,但它的许多特征也适用于传输SIP消息(如拥塞控制机制)。文章研究了如何用SCTP传输SIP信令消息。 相似文献
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The Stream Control Transmission Protocol (SCTP) is a general purpose transport protocol featuring multi-homing support, message
oriented and more flexible data delivery mechanisms than TCP, and an increased protection against well-known attacks. Originally
developed for the transport of Signaling System No. 7 messages, e.g. MTP level 3 user primitives, over IP networks, SCTP has
evolved to a general purpose transport protocol with a wide field of applications. With respect to multi-homing, the current
SCTP standard uses this feature for network level redundancy only. Therefore we propose and evaluate in this contribution
mechanisms for the application-specific optimisation of the SCTP protocol behaviour with respect to its multi-homing capabilities.
To satisfy the extremely strict performance requirements for signalling transport, efficient load sharing among all active
links is also highly desirable in SCTP scenarios. To this end, we propose a novel, improved load sharing algorithm for SCTP
with path based selective acknowledgements which avoids some of the drawbacks of the existing algorithms and achieves an increase
in throughput. Results of a comparative simulation study are presented to demonstrate the benefits of our algorithm. 相似文献
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《Latin America Transactions, IEEE (Revista IEEE America Latina)》2007,5(3):170-175
SCTP (Stream Control Transmission Protocol) is a protocol of the TCP/IP stack, initially conceived for transport of telephony signaling messages. This article shows a series of performance tests executed on the Linux Kernel SCTP implementation (LK-SCTP). 相似文献
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Guanhua Ye Saadawi T.N. Myung Jong Lee 《Selected Areas in Communications, IEEE Journal on》2004,22(4):727-736
The current stream control transmission protocol (SCTP) does not work well over lossy links. To make SCTP congestion control algorithms robust in lossy networks, the paper first introduces a fine-tuned explicit congestion notification (ECN) mechanism for SCTP in such environment, and then discusses the ECN-D SCTP that can differentiate noncongestion losses from congestion losses. We identify the optimal value of the congestion window for an SCTP source in response to ECN messages in order to maximize the throughput and maintain relatively small end-to-end delay. A simple and practical method to achieve the optimal value is developed by carefully choosing the threshold of queues that support ECN. Because the total goodput performance of SCTP associations is not sensitive to window reduction policies when the network load is heavy, and because fine-tuning SCTP or transmission control protocols congestion window in response to congestion indications using complicated methods may not be worth the increase in complexity of the protocol, the simplified method becomes attractive in achieving the optimal congestion window. 相似文献