软交换信令网关中传输协议的探讨

信令网关是软交换系统的重要组成部分,它用于解决现有No.7信令网与IP网之间的无缝融合问题.本文首先介绍了信令网关协议栈的参考模型,以及IETF建议的流控制传输协议的特点,最后总结了SCTP协议优于TCP协议的一些特性.     

SCTP协议和H.248协议在软交换技术中的应用

SCTP协议主要完成PSTN信令消息在IP网中的可靠传送;H.248协议是媒体网关控制器(MGC)与媒体网关(MG)之间的接口协议,完成媒体网关控制器(MGC)对媒体网关MG的控制,具有良好的扩展性。文章重点阐述了SCTP协议和H.248协议的基本     

Partial CRC Checksum of SCTP for Error Control over Wireless Networks

In the Stream Control Transmission Protocol (SCTP), when a portion of a packet is corrupted, the entire packet will be discarded at the receiver side. This may result in degradation of the throughput of SCTP over wireless networks with a high bit error rate. This paper proposes a new error control scheme of SCTP using a partial Cyclic Redundancy Check (CRC) checksum to enhance the throughput performance, in which a new ‘checksum chunk’ is introduced to effectively identify any corruptions of data chunks contained in the SCTP packet. In the proposed scheme, an SCTP data packet can carry one or more data chunks depending on the channel condition, and the newly defined ‘checksum’ chunk will contain the partial CRC checksums of the individual data chunks and/or the base header of the packet. By referring to these partial checksums, the receiver can discard only the corrupted data chunks, whereas the other available data chunks can be recovered. Simulation results show that the proposed scheme significantly provides better performance than the standard SCTP in the wireless networks.

浅析流控传输协议(SCTP)

随着技术的发展,Intemet和电话网PSTN之间的网络融合已经是一种必然的趋势,如何在IP网上实现语音业务,而且同样具有PSTN的业务质量和安全性保证,这就需要能够在IP网上既可以实现数据传输,也可以实现控制信令的传输。SCTP流控协议就是这样一种协议。本文将详细介绍协议的框架,分析协议的功能,分析此协议之所以能成为下一代网络的基本协议的原因。     

mSCTP协议异构网络切换性能评估

在RFC 5061中,提出了一种对SCTP协议的扩展,采用地址动态重配置的方法,解决了现在网络设备IP地址不断变化的问题。RFC 5061的推出促进了SCTP协议在移动网络无缝漫游解决方案中的应用。在本文中,测试了SCTP和mSCTP协议的切换时延,验证了mSCTP在无缝切换中应用的可行性。切换的场景包括移动终端的慢速移动和快速移动两种情况。     

SS7 over IP 的关键技术SCTP 概述

介绍了SCTP在信令传输中的使用，随后就SCTP的基本特性，分组格式和协议行为进行了阐述。     

Moving toward seamless mobility: state of the art and emerging aspects in standardization bodies

The challenge to provide seamless mobility in the near future emerges as a key topic in various standardization bodies. This includes first of all the support of seamless handover between homogeneous networks. Distinct technologies—such as IEEE 802.11WLANs (Wi-Fi) and IEEE 802.16 MANs WiMAX—have recently augmented such support to existing standards to enable seamless homogeneous handover. Cellular networks, in contrast, already included this inherently from the start. Currently considerable effort goes into coupling of different radio access technologies. Therefore, the second key topic in standardization is seamless heterogeneous handovers. IEEE, IETF, as well as 3GPP consider different approaches toward architectures and protocols enabling seamless mobility management. In this work, we discuss recent and on-going standardization activities within IEEE, IETF, and 3GPP toward seamless homogeneous as well as heterogeneous mobility support.     

软交换技术探析

分析了软交换技术的产生原因,对软交换的概念及相关协议进行了简要介绍,并针对目前软交换设备所能够提供的业务,提出了软交换网的应用,最后介绍了软交换的网络结构及实现。     

SCTP中引入基于排队延迟的拥塞算法

介绍SCTP拥塞控制机制,并在SCTP关联内引入基于排队延迟的FAST拥塞算法.通过比较分析基于排队延迟和基于数据丢失的两种拥塞算法,阐述基于排队延迟拥塞算法更加适合于网络发展的需求,并提出了SCTP中实现FAST拥塞控制机制的初步框架.