基于IMS的多媒体彩铃业务的设计和实现

多媒体彩铃(MRBT)业务是一种采用多种媒体作为回铃音的增值业务.结合IMS网络体系结构和MRBT业务属性,提出一种利用多媒体彩铃业务平台来实现MRBT业务的方案,包括系统设计和基于SIP(会话发起协议)的信令流程.同时,给出相关的特点分析并进行总结.     

BICC与SIP—T协议的比较

软交换网络的一个很重要特点就是开放性。软交换网络中同一个接口可能有多种实现协议,如SIP-T和BICC均可作为软交换之间的互通协议,其中SIP-T为IETF的标准,它在SIP协议的基础上增加了电话应用功能,以实现在IP上透明传递ISUP消息,并适用于IP承载场合。BICC为ITU-T的标准,同时支持ATM和IP传送方式。这两个协议目前均在不断扩充,以满足更多应用的需要,爱立信公司《BICC和SIP-T协议的比较》一文主要介绍了这两个协议的主要区别及在NGN网络中的实施。     

BICC和SIP-T协议的比较及其在NGN中的应用

１引言BICC协议是面向电话业务的应用，它能在NGN中为现有电路交换电话网络中的业务提供很好的透明性。BICC是由ISUP演进而来的，由ITU－TSG１１小组完成标准化。SIP的体系架构不像BICC定义的那样完善。SIP主要用于支持多媒体和其他的新型业务，也可用于单独的媒体或语音。SIP是IETF组织开发的基于会话的控制协议。SIP－T是SIP的扩展协议，主要支持基于IP网络的语音中继。采用BICC体系架构时，所有现有的功能保持不变，例如号码和路由分析等，仍然使用路由概念。这就意味着这种网络的管理方式和现有的电路交换网极为相…     

BICC与SIP-T的比较及在NGN中的实施

图1BICC面向电话业务的应用，它能为在NGN中实施现有电路交换电话网络中的业务提供很好的透明性。BICC是由ISUP演进而来的，由ITU-T SG11小组完成标准化。SIP的体系架构不象BICC定义的那样完善。SIP主要用于支持多媒体和其它新型业务，也可用于单独的媒体或语音。SIP是IETF组织开发的基于会话的控制协议。SIP-T是SIP扩展协议，主要支持基于IP网络的语音中继。本文概述了BICC和SIP-T的主要区别。比较假设采用分离的体系架构时，电路交换网的PSTN/ISDN现有功能保持不变。采用BICC体系架构时，所有现有的功能保持不…     

BICC和SIP-T协议的比较及在NGN网络中的实施

综述BICC面向于电话业务的应用,它能为在NGN中实施现有电路交换电话网络中的业务提供很好的透明性。BICC是由ISUP演进而来的,由ITU-TSG11小组完成标准化。SIP的体系架构不象BICC定义的那样完善。SIP主要用于支持多媒体和其它新型业务,也可用于单独的媒体或语音。SIP是IETF组织开发的基于会话的控制协议。SIP-T是SIP扩展协议,主要支持基于IP网络的语音中继。本文概括了BICC和SIP-T的主要区别。比较假设采用分离的体系架构时,电路交换网的PSTN/ISDN现有功能保持不变。     

基于服务器的网络BICC协议

国际电信联盟（ITU）宣布第二套载体独立呼叫控制（BICC）协议制度工作已结束。该协议为从当前的一般公众交换系统网向下一代基于服务器的网络过渡提供了条件。BICC利用最新网络设计技术（以一个服务器、代理和媒体网关网络结构为基础）支持目前电路交换网、ATM和IP（含3G无线）网上的所有业务,同时不会限制未来新型多媒体多模业务及应用的引入。今年7月2日,该协议在ITU电信标准部门（负责信令要求和协议）第11研究组（ITU-TSG11）召开的半天特别会议上得到通过。网络运营商使用BICC协议,在各种数据传送网上可传送全套PSTN…     

支持PSTN向NGN演进的协议--BICC

在传统电信网向下一代网络(NGN)演进的过程中，为了既能与现有电路交换网络兼容，又可以实现对未来分组交换网络的承载，ITU—T提出了独立于承载的呼叫控制协议(BICC)，BICC已经成为目前的一个研究热点。在介绍了BICC的体系架构与功能模型之后，分析了BICC的呼叫流程，最后给出了如何实现BICC对IP网络的承载控制。     

全业务运营下电信业务发展趋势

全业务运营的新局面下,各电信运营商正面临着新的挑战和机遇.随着网络技术的发展,电信运营商正在尝试发展网络融合的新业务,多媒体增值业务得到了极大的增强,逐渐成为被关注的热点.文中围绕全业务运营下电信业务发展趋势展开论述,对IP多媒体子系统(IP Multimedia Subsystem,IMS)进行研究,并以多媒体彩铃(Multimedia Ring-back-tone,MRBT)业务为例,介绍了一种基于IMS技术的增值电信业务,包括业务需求和实施方案,指出了实现全业务运营的技术和增值电信业务的发展趋势.     

移动通信网络核心网VoIP组网探讨

网络IP化已然是未来通信网络发展的重要趋势,能够达到精简移动通信网络结构,并加以改善的目的。移动通信网络核心网语音IP化也是全网实现IP化最为重要的构成部分,属于电路域网络向IP网络发展的必然经历。为此,简要分析了以BICC协议为基础的软交换和信网络语音实现IP化应如何进行组网,同时分析核心网VoIP组网的过程,业务的落实以及网络安全如何保证等有关内容,以期为移动通信网络核心网VoIP组网提供相应的参考与帮助。     

与承载无关的呼叫控制(BICC)规范和测试方法

详细介绍了与承载无关的呼叫控制(BICC)规范的4个部分:BICC的功能,BICC的消息、参数的基本功能和格式,BICC的程序,BICC的应用传送机制(APM)、隧道和IP承载控制协议,以及与承载无关的呼叫控制(BICC)测试方法。     

IP switching for scalable IP services

Internet protocol (IP) switching is emerging as a critical technology for improving the speed and scalability of the Internet. This paper discusses IP Navigator, a form of IP switching developed specifically for use in core network backbones, such as Internet service provider networks and major corporate backbones. IP Navigator combines the high speed and quality of service capabilities of asynchronous transfer mode (ATM) with the scalability and flexibility of IP. This paper presents an overview of the techniques that have been developed for operating IP over ATM. We outline the IP Navigator design and compare IP Navigator with other IP switching approaches     

TCP/IP在GPRS/EGPRS网络中的应用及影响

通用分组无线业务/增强型数据速率演进技术（GPRS/EGPRS）服务扩展了当前世界上最流行的第二代移动系统——基于语音的GSM,使其能够收发基于分组的数据。随着移动通信技术的发展和业务的多样化,人们对数据业务的需求不断增加,GPRS/EGPRS网络优化也成为了重中之重。除传统的无线网络及核心网络优化外,将其以端到端的思路分析,看为无线＋IP网络技术,成为了新的优化思路。因此传输控制协议/因特网互联协议（TCP/IP）作为互联网固有的最为广泛的传输协议在无线分组数据业务网络中同样得到广泛应用。主要就TCP/IP协议在GPRS/EGPRS中的应用其影响进行了分析。     

ATM in MPLS-based converged core data networks

Services supported by asynchronous transfer mode account for the majority of data and Internet service revenues generated by carrier networks today. This is based on ATM's ability to support high availability services with quality of service. However, the influences of the Internet and a highly dynamic telecommunications market have raised demands for increased flexibility while controlling costs. Therefore, future carrier networks are likely to continue to be based on established technologies, such as ATM, as well as IP. In many cases, this is achieved through maintaining separate ATM and IP core networks, with the IP network supporting Internet services, while the ATM network continues to support guaranteed services such as private lines, broadband access, and video. In some cases, however, it can be advantageous for a carrier to transport segments of their ATM network over their IP network core; for example, to transport ATM traffic currently carried on leased facilities onto an IP network where the service provider owns the facilities. Developments in IP and MPLS-based traffic engineering and QoS may increase the ability of IP-based networks to support ATM services using MPLS. This article provides an overview of approaches enabling a network based on MPLS that naturally supports IP services to also support ATM services. The drivers and requirements for convergence on an IP/MPLS core network are presented, followed by an overview of the different approaches and associated challenges currently being debated in the standards bodies.     

A survivable and cost-effective IP metro interconnect architecture

Due to volatile market conditions and increased competition, network operators and Internet service providers have been put under enormous pressure to cut costs while providing the same if not better levels of service to customers. Several aspects of network design are subject to review to assess possible cost savings while maintaining service levels and reliability. This article focuses on Internet protocol network infrastructure design, and in particular investigates architectural options for interconnecting small "IP metro" PoPs to an "IP core" PoP. The baseline architecture is characterized by dual uplink circuits from the metro to the core PoP. Three variants of an alternative architecture based on a single uplink circuit from the metro to the core PoP are compared against the baseline network in terms of end-to-end availability/downtime and capital cost.     

一种新的面向IMS网络的SIP协议栈

IMS是3G系统中核心网的重要部分,由SIP提供的会话发起能力建立起端到端的会话,并获得所需要的服务质量。本文基于有限状态机提出了一种新的面向IMS网络的SIP信令协议栈。通过在软终端上的功能、性能和可靠性测试,本文提出的SIP协议栈能够有效地完成多媒体通信功能。     

IP多播在无线接入系统的实现与分析

IP多播是一类重要的基于IP的应用,支持很多业务。无线接入系统使用灵活,作为IP网络的最后一跳,对组网寻址、服务质量构成影响;鉴于无线接入系统存在带宽有限、传输质量逊于有线方式等不足,所以在寻址方面通过合理的无线链路多播机制与IP多播寻址进行映射,在传输质量方面,通过对有线分组进行分片、ARQ、流控等机制,弥补UDP协议无流控、无确认等缺陷,以期提高服务质量。     

泛在IP协议体系

由于TCP/IP协议栈的固有特性难以承载未来网络的个性化需求,在网络协议发展历程的基础上,提出了下一代泛在IP（ubiquitous IP,UIP）协议体系。泛在IP是面向泛在全场景服务的未来承载需求,基于IP协议扩展,统筹“渐进式”和“革命式”创新,关键内容包括以灵活IP为核心的设计理念、3个维度的协议架构和在网络层及传输层的协议创新。对比分析了 IPv6+与 UIP 作为两代网络创新技术接力实现网络能力的提升,总结了UIP当前进展以及对未来的展望。     

A scalable framework for in IP-oriented terrestrial-GEO satellite networks

The exponential growth of the Internet, the heterogeneity of networks, and the need for QoS maintenance have urged researchers to develop ideas for managing network scalability and end-to-end QoS assurance. In this article, an IP IntServ architecture in the satellite access network is combined with a scalable IP DiffServ-like architecture in the terrestrial core network. The proposed architecture aims at guaranteeing fine-grained bandwidth control in the satellite access network and stateless scalability in the core network, by exploiting per-aggregate traffic flow control, typical of the aggregate RSVP protocol, and stateless service assurance, typical of the SCORE approach.     

移动自组织网络中可扩展的定位符/标识符分离路由协议

In the traditional Internet Protocol (IP) architecture, there is an overload of IP semantic problems. Existing solutions focused mainly on the infrastructure for the fixed network, and there is a lack of support for Mobile Ad Hoc Networks (MANETs). To improve scalability. A routing protocol for MANETs is presented based on a locator named Tree-structure Locator Distance Vector (TLDV). The hard core of this routing method is the identifier/locator split by the Distributed Hash Table (DHT ) method, which provides a scalable routing service. The node locator indicates its relative location in the network and should be updated whenever topology changes . Locator space is organized as a tree-structure, and the basic routing operation of the TLDV protocol is presented. TLDV protocol is compared to some classical routing protocols for MANETs on the NS2 platform. Results show that TLDV has better scalability.