TCP与SCTP-CMT分析及在无线网络应用比较

TCP协议与SCTP协议同属于传输层协议,都可以提供可靠的数据传输服务。SCTP-CMT是在SCTP协议的基础上提出的并行多路径传输机制,可以同时利用多条路径进行数据传输以提高链路的利用率,该文对TCP和SCTP-CMT的基本特性进行了简述。为比较TCP与SCTP-CMT在具有多种接入方式的无线网络中的传输性能,该文以车载网络环境为例,并在NS2仿真工具下对TCP与SCTP-CMT在车载网络环境中的传输效率进行仿真比较,仿真结果显示,SCTPCMT的传输性能始终高于TCP。     

SCTP协议分析与仿真研究

流控制传输协议（SCTP）是IETF推荐的一种新的传输层协议,它继承了传统TCP的一些特性,并发展出独特的多流性和多宿性,能更好地适应现代通信网发展的需求,并在一定程度上有取代传统传输层协议的趋势。文中在介绍传统传输层协议的基础上,详细分析了SCTP的特点和功能模块,并基于NS2软件模拟网络故障,对多址主机环境下的SCTP和TCP传输的容错能力进行了仿真比较。结果表明：SCTP能够在主路径断开的情况下自动切换路径继续传输,其多宿特征确保了SCTP协议的鲁棒性。     

SCTP传输无损压缩图像的研究

与TCP协议相比,SCTP协议更适合面向基于IP网络的多媒体类信号传输。本文首先讨论了SCTP的3个核心特性．多流（Multi-streaming）、多地址（Multi—homing）和用于协议安全的cookie机制,并介绍了SCTP协议的数据传输过程。在此基础上,本文重点论述了在SCTP中传输无损压缩图像的方案并实现了这个系统。并在最后进一步展望了SCTP的发展前景。     

SCTP性能的仿真分析

SCTP是下一代网络(NGN)的一种重要传输协议,融合TCP与UDP协议的优点,提供端到端的可靠业务传输,用来在IP网络上可信地传输SS7信令.立足SCTP一些新特性(比如多流性、多宿性),通过仿真软件NS2,在网络时延、抖动、丢包率、吞吐量几个典型的QoS参数方面,对比分析了SCTP协议与不同版本的TCP协议;仿真结果表明,使用SCTP协议的网络综合性能优于传统的TCP协议,从而进一步提高了网络的QoS,同时用户QoE也得到了提升.将SCTP性能与不同的TCP协议进行对比,基于这些网络QoS参数进行对比分析,为以后的SCTP特性进一步研究工作起到了铺垫的作用.     

无线环境下基于SCTP的并行多路径传输

随着网络接入技术的多样和接入设备的廉价,越来越多的移动终端具备多家乡的特性,而现有TCP/IP协议栈只能使用单一接口传输数据,无法充分利用多家乡的优势。在流控制传输协议(SCTP)基础上,设计了路径选择模块和快速路径切换模块,实现了一种无线并行多路径传输（Wireless CMT）解决方案,使得多家乡终端能够同时使用多个接口并行传输数据。在实际无线网络环境对Wireless CMT带宽聚合效果和快速路径切换效果分别进行测试验证。测试结果表明,Wireless CMT使无线网络传输效率和可靠性都得到了明显提升。     

SCTP传输性能研究

流控制传输协议SCTP是一种新型的传输层协议,主要用于在IP网上传输PSTN信令。将SCTP与TCP、UDP在一般的网络环境下进行了比较,发现SCTP的传输性能与TCP、UDP的相差甚远;同时将SCTP不同流数下的传输性能进行了比较,发现SCTP的传输性能与传输数据的流数、传输的数据量之间存在关系。基于实验数据,分析了SCTP与TCP、UDP在传输性能方面的差距的可能原因,并提出了相应的解决方法。     

一种基于SCTP的嵌入式Linux系统高性能数据传输的方法

SCTP属于传输层协议,提供了多宿主、多流等特性,解决了TCP带来的头端阻塞问题和UDP的安全可靠性问题。本文主要介绍了SCTP传输层协议在嵌入式Linux下的实现并设计了一种基于SCTP协议的嵌入式Linux系统之间的高性能数据传输的方法,特别在网络环境不理想的状况下,能获得更好的传输性能。     

无线环境下基于多流优先级的并行多路传输

在无线异构网络环境下提出一种基于多流优先级的并行多路传输方案。该方案基于并行多路传输协议CMT-SCTP,并利用了SCTP的多流特性和部分可靠特性。针对数据的重要性和时间敏感度,设计优先级数据调度算法;同时提出基于路径质量的数据分发机制,进一步保证数据的有效传输。在NS-2中的仿真结果表明,该方案能够有效提高数据传输的吞吐量,减少时延,保证较好的数据传输性能。     

基于SCTP协议的新型流媒体传输方案

随着流媒体技术的发展,传统的传输控制协议TCP严格有序、确认重传的方式,以及基于用户数据报UDP的流媒体传输方案中RTP与RTCP速率调整都不能很好地满足流媒体的传输要求.针对流媒体数据的特点及其对网络的特殊要求,结合流控制传输协议SCTP多宿主、多流、可配置的无序递交等特性,论证基于SCTP协议的新型流媒体传输方案能够更好地满足流媒体传输,并在ns-allinone-2.28环境下进行仿真验证.结果显示基于SCTP协议的新型流媒体传输方案具有更低的丢报率,更能提升流媒体传输性能.     

基于SCTP多路径传输的P2P系统设计与实现

流控制传输协议（SCTP）是一种面向连接、提供可靠数据传输服务的传输层协议,其多宿特性非常适合对传输性能要求较高的各类网络服务。文中在详细介绍SCTP传输协议的基础上,充分利用其多宿特性,结合P2P分布式网络数据分发的高效性优势,设计了基于SCTP的P2P分布式系统的模型和体系架构,并实现了新型的P2P数据传输系统。通过在实际网络环境中搭建系统进行测试,验证了两者结合的可行性。所得结论为在多路径环境下利用SCTP增强系统传输性能提供了参考。     

Improving transmission quality of MPEG video stream by SCTP multi-streaming and differential RED mechanisms

SCTP is an emerging transmission protocol with the advanced advantage of supports multi-homing and multi-streaming, which can provide high availability and increase reliability. To improve the performance of MPEG video over Internet, the present study modifies the multi-streaming mechanisms of SCTP, which enable SCTP to use network resources efficiently and provide a differential transmission priority for the encoding frame types of MPEG video stream. Furthermore, to further enhance the decodable frame ratio, the present study also modifies the queue management mechanism of RED which enable the modified RED to provide differential stream protection for MPEG video stream. The simulation results presented in this study confirmed that the proposed scheme can improve the performance of MPEG video stream.     

SCTP: a proposed standard for robust Internet data transport

The stream control transmission protocol (SCTP) is an evolving general purpose Internet transport protocol designed to bridge the gap between TCP and UDP. SCTP evolved from a telephony signaling protocol for IP networks and is now a proposed standard with the Internet Engineering Task Force. Like TCP, SCTP provides a reliable, full-duplex connection and mechanisms to control network congestion. However, SCTP expands transport layer possibilities beyond TCP and UDP, offering new delivery options that are particularly desirable for telephony signaling and multimedia applications.     

SCTP协议在NAT技术上的应用研究

流控制传输协议（SCTP）作为一种新兴的网络传输技术协议,由于其具有的多宿主（Multi—homing）和多流（Multi-streaming）等功能,使其必将成为下一代网络中的传输层协议中的主导,在未来互联网和移动网络中发挥重要作用,然而目前网际协议（IP）网络中大多数网络地址转换（NAT）设备对SCTP报文转发缺乏兼容支持。,分析并解决了SCTP在当前IPV4网络实施中所遇到的NAT阻断问题,利用在收发端协议栈上进行功能扩展,提出了一种新的SCTP报文的NAT映射传输方法,在不修改当前网络NAT设备的前提下完成NAT映射,并通过测试验证了解决方案的可行性和有效性：     

UDP协议与TCP协议的对比分析与可靠性改进

鉴于互联网快速发展,计算机网络正逐渐应用到通信网络,以太网在移动通信网络建设中起到越来越重要的作用。目前,实现可靠数据传递的方法主要采用传输控制TCP协议或者SCTP简单流传输协议。传输层的TCP协议和UDP协议各有特点和优势,在与以太网的结合过程中,通过详细的对比分析,UDP更加符合以太网的传输环境,不过由于UDP是非可靠通信协议,直接将其使用在对可靠性要求非常严格的电信领域还需要对其进行改造。结合TCP和UDP的优点,提出了RUDP协议,并做了简单介绍。     

A new medium access control protocol based on perceived data reliability and spatial correlation in wireless sensor network

It is well known that the data of large-scale and dense wireless sensor network has high spatial correlativity. According to the monitoring of a particular event, a new medium access control (MAC) protocol based on perceived data reliability and spatial correlation is proposed in this paper. In this protocol, a ring-shaped space correlation model is established. The nodes close to information source is attributed them high priority in access channel so as to make sure the high quality data send successfully to the sink node and increase the data transferring efficiency. The new protocol can make the received data reflect the real physical phenomenon. At the same time, it can make the data transmission of the nodes far to information source be brought down and the amount of required data nodes be reduced. So the new protocol can prolong lifetime of the whole network. Our simulation results show that the new MAC protocol can supply better network service under low energy consumption and transmission delay. This is very useful for all kinds of mobile services of Internet of Things.     

A transmission control SCTP for real-time multimedia streaming

Multimedia streams over the Internet have a strict playback delay time, i.e., multimedia data arriving after the playback time cannot be played by the receiver and they are discarded. In this paper, we introduce a transmission control SCTP (TC-SCTP) which has a transmission control sub-layer (TCSL) in which the multimedia streaming server determines whether data can be played in the receiver before sending the data and decides whether to send data messages or not. In addition, TCSL employs differentiated retransmission policy depending on the type of multimedia. We evaluate the performances of SCTP, partial reliability (PR)-SCTP, and TC-SCTP via ns-2 simulator. The simulation results demonstrate that the TC-SCTP protocol can decrease the amount of transmissions and increase the video decodable ratio, compared with other protocols.     

SCTP传输MPEG4视频流的性能分析

为了在IP分组网络上传输N0.7信令，IETF信令传输工作组专门制定了流量控制传输协议(SCTP)。该文对SCTP与TCP进行了比较，分析了CCTP适合于信令和多媒体传输的特性，研究了用SCTP传输MPEG4视频流的性能，并进行了仿真和分析。最后讨论了SCTP其它的一些可能的应用。     

QoS-aware path switching for VoIP traffic using SCTP

Voice over Internet protocol (VoIP) has been a prevalent multimedia service nowadays. It allows us to transmit voice data over IP networks. However, quality of service (QoS) is a major challenge to VoIP services. It must provide similar quality to traditional public switched telephone network or cellular phone services. Therefore, QoS related protocols have become important for real-time applications. Multi-protocol label switch (MPLS) is one of the important techniques to improve the network performance from QoS point of view. It employs label swapping to speed up packet forwarding. However, when a large number of users utilize VoIP services, the network congestion issue still exists. It causes delay, jitter and packet loss that affect VoIP QoS. In this paper, we propose a QoS-aware path switching strategy by using stream control transmission protocol (SCTP) in MPLS network to improve the VoIP traffic. This was done by employing SCTP selective acknowledgment mechanism to report the transmission parameters of primary path and to determine the criteria to switch to backup path. Simulation results show significant improvement in VoIP QoS.