NGN中路由配置方案的比较

Compare Routing Models of NGN

本文首先介绍NGN的基本概念和网络构架,接着介绍了软交换的概念和体系结构,然后针对目前NGN建设的现状,提出了NGN中的3种路由解决方案:平面软交换路由体系、层次化的软交换路由体系和服务器定位方案,并对这3种方案的优劣进行比较分析,平面软交换路由结构简单,建设成本低,因此在网络运营的初期,可以采用该方式,当网络规模扩大到一定程度,就需要采用分级的路由结构。层次化软交换路由体系中,软交换机根据呼叫信令进行逐跳路由,因此呼叫接续时延较大,但这一方案比较成熟,LS路由则是呼叫信令直接在起始和目的软交换机之间传递并处理,但相对前者成熟度不高。本文的一个重点是介绍TRIP的概念,因为它将是NGN的标准路由协议。

This paper outlines the concept and architecture of NGN and softswitch. And then presents three routing models of NGN according the current cases of NGN： no interoperability between softswitches, interoperability between softswitches and local server. The architecture of plain network is simple, so it is a very popular business model in the initial stage of NGN. With the development of NGN, interoperability between softswitches becomes more and more popular. For softswitches, any single call must pass though multiple switches to its destination by some definitely rules, so there will be a long time delay to establish a call. However, LS routing can send a call directly from initial softswitch to the destination. One of the key aspects is the introduction to the concept of TRIE which can be the standard routing protocol in NGN.