摘要
借助于No.7信令网和大型集中式数据库的支持,移动智能网将网络的交换功能和控制功能相分离,把网络中各网元的智能集中到新的功能部件——由中小型计算机组成的SCP(Service Control Point,业务控制点上),而原有的交换机仅完成基本的接续功能。SCP为了与SSP(Service Switching Point,业务交换节点)及SS7(Signaling SystemNo.7)信令网连接,还需要信令前台的支持。信令前台描述了信令传输的层次结构,由一些用于控制和传输的协议组成。
IPS(Integrated Programmable Switch)综合可编程交换机,是一个独立的七号信令前端处理平台,它既提供七号信令前端处理的功能,也提供交换控制功能,可通过标准的TCP/IP接口与后台的主处理机进行内部通信,提供MTP(Message Transfer Part Layer)、SCCP(Signaling Connection Control Part)、TCAP(Transaction CapabilitiesApplication Part)、TUP(Telephone User Part)或ISUP(ISDN UserPart)各层协议处理和服务,完成特定业务的功能。随着东信IPS交换机作为彩铃信令前台在现网应用中的逐渐成熟,东信交换机信令前台的高性能、成本低等优点逐渐体现出来。加之其作为电信级产品的功能和稳定性更适合作为SCP前台来应用。
本文对以IPS做SCP信令前台的方案进行设计与实现,并根据测试所得出的数据对此方案进行了总结和评价。文章的组织结构如下:第一章绪论部分首先介绍了移动智能网(MIN,Mobile IntelligentNetwork)的体系结构,随后介绍了不同电信厂商和标准化组织提出的四种移动智能网方案:ESTI(European Telecommunications StandardInstitute)提出的CAMEL(Customized Applications for Mobile NetworkEnhanced Logic)、ANSI(American National Standards Institute)提出的WIN(Wireless Intelligent Network)、爱立信提出的NI(NetworkIntelligent)和摩托罗拉的WINA(Wireless Intelligent NetworkArchitecture),然后又介绍了三种常见的智能网业务:预付费业务PPS(Pre-Paid Service)、多彩回铃音业务CRBT(Color Ring Back ToneService)和虚拟专用移动网VPMN(Virtual Private Mobile Network),最后引出了移动智能网的信令前台这个概念,并就HP的OpenCall和东方通信的IPS两种信令前台产品进行了介绍。第二章先对IPS作信令前台的方案进行总体设计,提出了这种方案的总体架构,然后进行详细设计和实现,重点是两个协议接口N7server和17server的设计和实现,N7server和17server在逻辑结构上都位于IPS与后台Manager之间,主要功能是信令转发、对话维护、流量控制以及消息的打包和解包,所不同的是,前者处理TCAP协议而后者处理ISUP协议。第三章根据电信运营商日益迫切的需求,在前面设计的方案的基础上,提出了大容量SCP组网的解决方案:前台多模块、后台多主机配置以大大增加其处理能力,然后对这种方案的可靠性进行了分析,重点是前台主模块身份如何维护和系统双网结构如何设计,最后就多模块组网的情况下由本端发起的事务和由对端发起的事务两类流程如何运行进行了论证。第四章介绍了方案测试及评价,根据测试情况记录了测试用例及结果,并根据所得到的数据对这种方案进行了总结和评价。第五章总结当前进展,并列出下一步的工作。
With the support of No.7 signaling network and large-scale concentrated type database, MIN(Mobile Intelligent Network) separates network switching and controlling, and integrates the intelligence of units in the network into the new function module-SCP(Service Control Point) which is made up of medium and micro computers. Meanwhile, existing switches only operate fundamental switch function. In order to connect to SSP(Service Switching Point) and SS7(Signaling System No.7) signaling network, SCP also needs support from signaling front end. The signaling front end describes the hierarchy of signaling which is made up of transmission and controlling protocols.
IPS (Integrated Programmable Switch) is an independent No.7 signaling front end processing platform. It provides not only the function of front end processing but also the function of switch control. Its internal communication with the background main processor is through the standard TCP/IP interface. It provides processing and services for protocols at various layers such as MTP(Message Transfer Part Layer), SCCP(Signaling Connection Control Part), TCAP(Transaction Capabilities Application Part), TUP(Telephone User Part) or ISUP(ISDN User Part) to implement the specific services. As the application of IPS used as CRBT(Color Ring Back Tone Service) signaling front end platform become more mature, IPS shows its high performance and low cost. It is very suitable for SCP signaling front end platform as it represents a telecom-class functionality and stability.
The thesis focuses on the design and implementation of IPS used as SCP signaling front end platform, and evaluation of this solution according to testing result. Chapter 1 begins with the introduction of MIN architecture and principle, followed by an introduction of four MIN solutions :CAMEL(Customized Applications for Mobile Network Enhanced Logic) brought up by ESTI(European Telecommunications Standard Institute), WIN(Wireless Intelligent Network) brought up by ANSI(American National Standards Institute), NI(Network Intelligent) brought up by Ericsson and WINA(Wireless Intelligent Network Architecture) brought up by Motorola, then an introduction of three common MIN services: PPS(Pre-Paid Service), CRBT(Color Ring Back Tone Service) and VPMN(Virtual Private Mobile Network), then the concept of signaling front end platform, with an introduction of OpenCall and IPS at the end. Chapter 2 addresses the design and implementation of signaling front end platform and brings up the main infrastructure of this solution. The emphasis is the design and implementation of two protocol interfaces: N7server and I7server. The two interfaces both lay between IPS and back end in logical structure. Their main fuctions are message transmission, session maintenance, flow control and package analysis. The difference is the former processing TCAP protocol and the latter processing ISUP protocol. Chapter 3 brings up a High-Capacity SCP Solution: multi-module, multi host configuration to highly improve its processing capabilities, meeting the high requirements of telecom operators, followed by liability analysis which includes the dual structure and identity maintenance of main module. At last it proves the signaling processes under two circumstances: instance initiated by proximal end and distant end. Chapter 4 focuses on the test of the solution and evaluation of the solution according to the result data. In the last chapter, there is a summarization of progress and a list of the follow-up work.
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