下一代网络中基于七号信令的媒体网关设计

论文总字数：17865字

摘 要

随着下一代网络（NGN）的发展，全球的网络正在进行一次巨大演进。与传统的网络相比较NGN是一个开放的网络平台，它以IP为核心，通过相应的IP协议构建了一个同时提供语音，数据及多媒体服务的网络。其中的主要构成角色软交换和媒体网关的研究设计是一个热议的话题。本文就媒体网关主要协议H.248协议及软交换中七号信令的主要协议SIGTRAN协议进行阐述及网关设计，对媒体网关的现状、背景等做了相应的介绍，并就设计的媒体网关的系统结构进行了相应阐述。

文章的第一章中对设计课题的背景进行了相应的介绍。对下一代网络的发展动力、目标以及进程进行了阐述。就下一代网络的具体结构进行了概述，简单介绍了各个组成部分。对下一代网络中的媒体网关这一环节的发展情况进行了概述，从其功能、种类以及目前研究中所遇到的问题进行了阐述。本章中还对文章的整体构架进行了分配，介绍了每章节中的主要内容。

本文的第二章对媒体网关中的各类控制协议，尤其是H.248协议以及七号信令的控制协议SIGTRAN协议进行了详细的介绍。从协议的基本模型、功能、意义、流程等方面进行了相应的介绍。

第三章对七号信令进行了介绍。对七号信令方式的总体结构进行了说明，从七号信令的基本目标、功能级划分以及于OSI模型的对应这三个方面对七号信令进行了系统的描述。

第四章是媒体网关设计的说明章节。对媒体网关功能模型、软件结构以及GCP程序实现进行了分析，对网关的设计进行了说明。给出了设计网关的机框图，对信号的传递过程进行了阐述，描述了网关的工作流程。

第五章对全文进行了总结，综合性的总结了各个章节的内容，并对课题的发展性研究进行了展望。

关键词：下一代网络（NGN）；H.248协议；SIGTRAN协议；七号信令；媒体网关

Design of Media Gateway Based on SS7 in Next Generation Network

Abstract

With the development of the next generation network (NGN), the global network is undergoing a great evolution. Compared with the traditional network, NGN is an open network platform. It takes IP as the core, and constructs a network of voice, data and multimedia services at the same time through the corresponding IP protocol. The main role of the soft switch and media gateway is a hot topic. In this paper, the media gateway main protocol H.248 protocol and softswitch No.7 signaling main protocol of Sigtran protocol was elaborated and gateway design, introduced the present situation and background of the media gateway, and design of the media gateway system in the structure of the corresponding statement.

In the first chapter, the paper introduces the background of the design project. The development momentum, goal and process of the next generation network are described. The specific structure of the next generation network is outlined, a brief introduction of the various components. This paper summarizes the development of the media gateway in the next generation network, and expounds the functions, types and the problems encountered in the current research. The overall framework of the article is also assigned, and the main content of each chapter is introduced in this chapter.

The second chapter of this paper introduces all kinds of control protocols in the media gateway, especially the H.248 protocol and the control protocol SIGTRAN protocol of No. seven signaling. From the basic model, function, significance, process and other aspects of the agreement were introduced.

In the third chapter, it introduces the seven signaling. The general structure of the seven signaling mode is described, and the system is described from seven aspects: the basic goal of the seven signaling, the division of the functional level and the corresponding three aspects of the OSI model.

The fourth chapter is the description section of the design of the media gateway. The function model of the media gateway, the software structure and the implementation of GCP program are analyzed, and the design of the gateway is described. The block diagram of the design gateway is given, and the transmission process of the signal is described, and the working flow of the gateway is described.

The fifth chapter summarizes the full text, summarizes the contents of each chapter, and prospects the development of the subject.

Keywords: Next Generation Network (NGN); H.248 Protocol; SIGTRAN Protocol; Seven Signaling; Media Gateway

目 录

摘 要 I

Abstract II

第一章 引 言 1

1.1 本文研究的背景意义 1

1.2 媒体网关的发展情况 1

1.3 本文的章节安排 3

第二章 媒体网关的控制协议及七号信令协议 4

2.1 H.248/MEGACO协议简介 4

2.1.1 H.248协议的连接模型 4

2.1.2 H.248协议中的包 4

2.1.3 H.248协议的安全性 5

2.1.4 H.248协议所确定的交互流程 5

2.1.5 与传统MGCP协议对比 5

2.2 SIGTRAN协议简介 5

2.2.1 流控制传输协议SCTP 6

2.2.2 M2UA/M2PA协议 7

2.2.3 M3UA协议 7

第三章 七号信令方式的总体结构 8

3.1 No.7信令简介 8

3.1.1 No.7信令的基本目标 8

3.1.2 No.7信令的功能级划分 8

3.1.3 No.7信令的OSI分层结构 8

第四章 媒体网关的设计 10

4.1 媒体网关的功能模型 10

4.2 媒体网关的软件结构 10

4.3 GCP应用程序的实现 11

4.4 设计方案 12

4.4.1 语音控制网关的机框模块说明 12

4.4.2 媒体网关工作流程说明 13

第五章 总结与展望 14

5.1 本文总结 14

5.2 课题展望 14

参考文献 15

致 谢 16

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