軟交換技術(shù)及其應(yīng)用

1、 軟交換技術(shù)及其應(yīng)用通信與網(wǎng)絡(luò)研究室:趙問道浙江大學(xué)信息與通信工程研究所內(nèi)容安排V第一章軟交換概述V第二章軟交換體系結(jié)構(gòu)V第三章軟交換標(biāo)準(zhǔn)協(xié)議V第四章軟交換應(yīng)用體系結(jié)構(gòu)V第五章軟交換技術(shù)在無線核心網(wǎng)絡(luò)中的應(yīng)用V第六章國內(nèi)外軟交換系統(tǒng)介紹技術(shù)及其應(yīng)用第一章軟交換概述V§1.1 軟交換技術(shù)產(chǎn)生的背景V§1.2 軟交換基本概念V§1.3 軟交換的業(yè)務(wù)框架V§1.4 軟交換系統(tǒng)結(jié)構(gòu)技術(shù)及其應(yīng)用傳統(tǒng)基于TDM 的PSTN 話音網(wǎng)特點V 業(yè)務(wù)和控制均由交換機完成a 封閉結(jié)構(gòu)V 呼叫控制和業(yè)務(wù)是結(jié)合在一起的V 呼叫控制是針對TDM 電路的a 呼叫與承載緊密相關(guān)V語音品

2、質(zhì)優(yōu)良V 新業(yè)務(wù)的提供需要較長周期V 增值業(yè)務(wù)主要是與呼叫相關(guān)的V 沒有開放的業(yè)務(wù)提供平臺概述軟交換技術(shù)產(chǎn)生的背景當(dāng)前電信業(yè)務(wù)發(fā)展特點V新業(yè)務(wù)層出不窮,數(shù)據(jù)業(yè)務(wù)快速發(fā)展,數(shù)據(jù)業(yè)務(wù)量迅速膨脹V新的語音壓速技術(shù)已經(jīng)可將話音信號壓縮在低于64kbit/s的信道上傳遞a已應(yīng)用于D IP電話D第二代GSM移動通信系統(tǒng)D第三代CDMA移動通信系統(tǒng)V多媒體業(yè)務(wù)發(fā)展迅速a MPEG1/2/4概述軟交換技術(shù)產(chǎn)生的背景通信網(wǎng)絡(luò)發(fā)展V傳統(tǒng)觀點:程控交換-ISDN-ATM a在傳輸和交換兩個層面均實現(xiàn)統(tǒng)一,以此來實現(xiàn)對不同業(yè)務(wù)的綜合V市場選擇:基于IP的寬帶通信系統(tǒng)a IP Over Everythinga Ever

3、ything Over IPV NGN:網(wǎng)絡(luò)融合和業(yè)務(wù)融合a基于TDM的PSTN話音網(wǎng)與分組交換數(shù)據(jù)網(wǎng)融合軟交換概述軟交換技術(shù)產(chǎn)生的背景NGN 特點V采用開放的網(wǎng)絡(luò)架構(gòu)a將傳統(tǒng)交換機的功能模塊分離成為獨立的網(wǎng)絡(luò)部件a部件間的協(xié)議接口采用開放的標(biāo)準(zhǔn)V業(yè)務(wù)驅(qū)動型網(wǎng)絡(luò)a業(yè)務(wù)與呼叫控制分離a呼叫與承載分離V基于統(tǒng)一協(xié)議和基于分組的網(wǎng)絡(luò)a IP協(xié)議a寬帶IP網(wǎng)絡(luò)軟交換概述軟交換技術(shù)產(chǎn)生的背景NGN 分層結(jié)構(gòu)V接入和傳輸層:將用戶連接至網(wǎng)絡(luò),集中用戶業(yè)務(wù)將它們傳遞至目的地,包括各種接入手段。V媒體層(Media layer:將信息格式轉(zhuǎn)換成為能夠在網(wǎng)絡(luò)上傳遞的信息格式。V控制層(Control layer

4、:包含呼叫智能。此層決定用戶收到的業(yè)務(wù),并能控制低層網(wǎng)絡(luò)元素對業(yè)務(wù)流的處理。V網(wǎng)絡(luò)業(yè)務(wù)層(Network Service layer:在呼叫建立的基礎(chǔ)上提供額外的業(yè)務(wù)。概述軟交換技術(shù)產(chǎn)生的背景NGN 分層結(jié)構(gòu)示意圖概述軟交換技術(shù)產(chǎn)生的背景現(xiàn)有網(wǎng)絡(luò)演變NGN 兼容性要求V采用TDM 傳輸和SS7信令網(wǎng)互通V 與現(xiàn)有的業(yè)務(wù)如智能網(wǎng)提供的業(yè)務(wù)互通V 與現(xiàn)有的PSTN 網(wǎng)絡(luò)體系融合概述軟交換技術(shù)產(chǎn)生的背景軟 交 換 概 述 軟 交 換 技 術(shù) 產(chǎn) 生 的 背 景 為NGN提供具有實時性要求的業(yè) 務(wù)的呼叫控制和連接控制功能 與業(yè)務(wù)無關(guān)，提供各種業(yè)務(wù)的 基本呼叫控制 "Softswitch&qu

5、ot; is an all-encompassing term for next-generation communications systems that employ open standards to create integrated networks with a decoupled service intelligence capable of carrying voice,video and data traffic more efficiently and with far greater valueadded service potential than is possib

6、le with the existing Public Switched Telephone Network. NGN NGN 核 心 軟 交 換 軟 交 換 概 述 The softswitch will play a trategic role in the next-generation public network infrastructure for voice, video and data communications Application Servers SS7 Gateway SS7 The Softswitch at Work The Softswitch at Work

7、 軟 交 換 基 本 概 念 SIP CPL Digital Cross Connect Q.931/Q.2931 Softswitch MGCP Cellular Station H.323 MGCP SIP MEGACO IAD with DSL/Cable Modem Media Gateways 軟 交 換 概 述 P R O P R I E T A R Y Circuit-Switched Soft-Switched Services, Applications & Features (Management, Provisioning and Back Office Open

8、 Protocols APIs Circuit-switch vs. Softswitch Services & Applications Call Control & Switching Transport Hardware 軟 交 換 基 本 概 念 Softswitch Call Control Open Protocols APIs Transport Hardware Solutions come from a single vendor that supplied everything in one proprietary box: software, hardwa

9、re and applications Customers were lockedin to their vendorno room for innovation, expensive to implement and maintain Solutions can come from multiple vendors, at all levels who supply open standards-based products Customers are free to choose best-in-class products to build their network. Open sta

10、ndards enable innovation and reduce costs 軟 交 換 概 述 New and enhanced applications Intelligent Networking PLUS Multimedia with integrated voice/video/data Limited only by the imagination The Softswitch Potential The Softswitch Potential 軟 交 換 基 本 概 念 Lower barriers to entry for both system suppliers

11、and service providers Open architecture, protocols and APIs Leverages any/all underlying transports (packet/frame/cell Dramatically less expensive development and deployment Greater linear scalability based on an incremental “pay as you grow” infrastructure All fully interoperable with the TDM-based

12、 PSTN The Softswitch Challenges V Lots of protocols! (e.g. MGCP, MEGACO, SIP, SS7, CPL, H.323,Q.931/Q.2931,DiffServ, RSVP, RTP, RCP, MPLS, 802.1p, etc.V From lots of standards bodies(e.g. ITU, IETF, FRF, ATM Forum, IEEE, etc.V Being implemented by lots of playersV All chasing an evolving architectur

13、eV Under legacy regulatory conditions(e.g. tariffs, co-location, certifications, etc.V In a global marketplace軟交換概述軟交換基本概念軟交換主要功能V提供支持多種信令協(xié)議(包括H.248,H.323,SIP ,SCTP 、ISUP+、INAP+、RADIUS、SNMP的接口,實現(xiàn)PSTN網(wǎng)和IP網(wǎng)/ATM網(wǎng)間的信令互通和不同網(wǎng)關(guān)的互操作。V主要處理實時業(yè)務(wù):第一階段是話音,以后也將處理視頻和多媒體業(yè)務(wù)。V提供可編程的,邏輯化控制的開放的API協(xié)議,實現(xiàn)與外部應(yīng)用平臺的互通。V通過不同的

14、邏輯與媒體層的網(wǎng)關(guān)交互,對網(wǎng)關(guān)設(shè)備或IP/ATM網(wǎng)的核心設(shè)備進行控制,完成融合網(wǎng)絡(luò)中的呼叫控制,會話的建立,修改和拆除過程以及媒體流的連接控制。V提供網(wǎng)守功能, 即接入認證與授權(quán)、地址解析和帶寬管理功能。V操作維護功能,主要包括業(yè)務(wù)統(tǒng)計和告警等。V計費功能,應(yīng)具有采集詳細話單的功能。軟交換概述軟交換基本概念軟交換業(yè)務(wù)框架V提供現(xiàn)有電話網(wǎng)中的一些基本業(yè)務(wù)和補充業(yè)務(wù)。V可以與智能網(wǎng)的SCP相結(jié)合,提供各種智能業(yè)務(wù)。V引入一個新的組件-應(yīng)用服務(wù)器(Application Server,軟交換還可以為三方應(yīng)用提供應(yīng)用平臺,不僅提高了服務(wù)的種類,而且加快了服務(wù)應(yīng)用的速度。軟交換概述軟交換業(yè)務(wù)框架基于軟交

15、換的增值業(yè)務(wù)框架軟交換概述軟交換業(yè)務(wù)框架軟交換系統(tǒng)結(jié)構(gòu)軟交換概述軟交換系統(tǒng)結(jié)構(gòu)NGN 對外接口軟交換概述軟交換系統(tǒng)結(jié)構(gòu)第二章軟交換體系結(jié)構(gòu)V ISC Reference Architecture Functional PlanesV ISC Reference Architecture Functional EntitiesV ISC Reference Architecture MGC Building BlocksV ISC Reference Architecture Physical Example軟交換技術(shù)及其應(yīng)用ISC Reference Architecture Function

16、al Planes軟交換體系結(jié)構(gòu)Functional PlanesISC Reference Architecture Functional Entities 軟交換體系結(jié)構(gòu)Functional EntitiesBuilding Blocks軟交換體系結(jié)構(gòu)MGC Building Blocks ISC Reference Architecture MGCISC Reference Architecture Physical Example軟交換體系結(jié)構(gòu)Physical ExampleSystem Example Wireline network體系結(jié)構(gòu)Wireline networkExamp

17、les Carried over IP體系結(jié)構(gòu)POTS POTSExamples AccessNetwork (V 5, ISDN over IP 軟交換體系結(jié)構(gòu)Access Network over IP軟交換體系結(jié)構(gòu)Physical Example Examples Cable Network (PacketCableTMExamples VoDSL andIAD over IP 體系結(jié)構(gòu)VoDSL and IAD over IPExamples Wireless(3GPP R 99體系結(jié)構(gòu)WirelessExamples Wireless (3GPP R 2000All IP Gener

18、al Case軟交換體系結(jié)構(gòu)3GPP All IPSystem Example WCDMA mobile network軟交換體系結(jié)構(gòu)WCDMA第三章軟交換標(biāo)準(zhǔn)協(xié)議V§3.1 軟交換標(biāo)準(zhǔn)化情況V§3.2 SIP協(xié)議V§3.3 H.323協(xié)議V§3.4 MGCP/MEGCO協(xié)議軟交換技術(shù)及其應(yīng)用軟交換標(biāo)準(zhǔn)化情況V International Softswitch Consortiuma Applications Working Groupa Device Control Working Groupa Interoperability Working Groupa Legal Intercept Working Groupa Marketing Working Groupa Network Boundary FunctionalityWorking Groupa SIP Working Groupa Wireless Working GroupV國內(nèi):“軟交換設(shè)備總體技術(shù)要求”軟交換標(biāo)準(zhǔn)協(xié)議軟交換標(biāo)準(zhǔn)化情況Protocol Stack標(biāo)準(zhǔn)協(xié)議軟交換標(biāo)準(zhǔn)化情況標(biāo)準(zhǔn)協(xié)議軟交換標(biāo)準(zhǔn)化情況Standards( 1 標(biāo)準(zhǔn)協(xié)議軟交換標(biāo)準(zhǔn)化情況Standard