无线与频宽整合之多媒体通讯技术.ppt

1、無線與頻寬整合之多媒體通訊技術,工研院電通所 網路技術組 組長 2003. 11. 26,課程目的,本課程將與您一起探討通訊產業中三個重要之發展趨勢 IP 電信(VoIP)逐漸成為未來通訊技術之主流, 不僅將對服務產業將發生變化, 而且也將為通訊產品產業帶來新契機;本課程將提供學員對此一領域做初步之介紹 ENUM為一項非常新的技術, 它將是推動 IP/ PSTN系統與服務整合的最大動力, 同時也將對網際網路之應用產生革命性之衝擊, 為人們使用日常生活之所有通訊服務帶來莫大之便利; 本課程將對此一最新技術及其發展趨勢做深入淺出之說明 WLAN 之近年來成為無線通訊之熱門話題, 各企業甚至家庭開始

2、積極建設WLAN, 此趨勢相信將持續幾年. 不過建設WLAN作何用途? Public WLAN 服務業者有無生存空間? WLAN 與 3G關係又是如何? 互補呢還是競爭?本課程最後一節將與您一起探討WLAN 與無線通訊系統之競合關係, 了解WLAN應用之發展趨勢,課程大綱,IP 電信技術的發展趨勢 VoIP 的過去現在與未來 VoIP 的技術發展-從H.323 到SIP SIP 的應用與發展趨勢 ENUM - IP/PSTN整合之新趨勢 何謂ENUM? ENUM 服務機制 WLAN 應用服務的發展趨勢 WLAN 之應用 WLAN 與無線通訊系統之整合,通訊產業幾個重要發展趨勢,VoIP 產業復

3、甦, 有蓬勃發展趨勢 IP-Phone, Wi-Fi SIP Phone, Residential Gateway, IP-PBX, 日本 Yahoo BB, J-Phone, Wireless LAN 蓬勃發展, 但服務商業模式尚待開發 技術演進迅速, 公司企業, 家用 Public WLAN, Cellular/WLAN 整合 ? Wireless Data (Mobile Internet) 發展不如預期 Mobile Data Voice SMS, MMS, 3G 通訊系統前景不明 GPRS 3G ? Cdma2000-1x vs. WCDMA ?,IP 電信技術的發展趨勢,Yahoo

4、!BB VoIP Business Model,Over 1M+ BB Phone users (Dec 5th, 2002 Press Release),VoIP 的過去,Born of VoIP Industry VoIP Phone - VocalTech 1995 H.323 Standard for VoIP Industry H.323 Was Proposed by ITU-T for Multimedia Communication over LAN in 1996 Adopted Quickly and Widely by Industries VoIP Gateway, G

5、atekeeper, Enterprise GW, IAD Mainly Used in Enterprise, Toll-by-Pass Applications Market Slow Down Infrastructure Bottleneck - Limitation of H.323 New Technologies Developed Users Hesitate to Buy H.323 Products Vendors Invest Much in H.323,VoIP 的現在,New Technologies Ready MGCP, MEGACO/H.248, SCTP/M3

6、UA, SIP/SDP, IETF-like Protocols New Products Developed Most Upgraded from H.323 Products Support New Technologies as well as H.323 VoIP Infrastructure Softswitch, Trunk GW, SS7 Signaling GW (SS7 over IP) Market Re-Booming,IETF Technologies Dominate SIP Telephony Being Widely Accepted ENUM for IP/PS

7、TN Convergence Being Developed Softswitch vs. SIP Softswitch: Mainly for Class 4/5 Switch Replacement SIP: Provide Telephony from IPs Point of View,VoIP 的未來,VoIP Infrastructure will Get Ready (How Soon ?) ENUM for IP/PSTN Convergence Product and Service Start to Boom Its Technologies Trend, Not Just

8、 for Cost Saving Driving Force of NGN Mandatory in Future All-IP Network SIP Technologies Will Dominate SIP Telephony/CO Signaling/Multimedia Service/3G Key Technologies for IP/PSTN Convergence,Trends of VoIP Technologies,IP/PSTN Convergence,PSTN,SIP Proxy,ENUM Service System,SIP Phone,SIP Phone,Gat

9、eway,Softswitch,Application Server,Media Server,SIP Telephony,H.323,ENUM Servers,Operator 1,Operator 2,SIP,SIP,DNS,IP Network,VoIP Services Applications,PSTNs (Telecomm.s) Point of View Equip PSTN with VoIP Services Original Voice Users For Cost Saving, No Service Enhancement Class 4/5 Switch Replac

10、ement with Softswitch No Extra Revenue ISPs (IPs) Point of View Enhance Data Network with VoIP Capability Additional Voice Service to Original Data Users Even Voice/Data Integrated Services SIP Telephony + Application/Media Servers,VoIP Technologies- From H.323 to SIP,H.323 for VoIP,Has Been Adopted

11、 by Vendors for Years Almost Current VoIP Products Support H.323 Gateway Gatekeeper Terminal MCU,Challenges of H.323,H.323 Was Originally Proposed for LAN Environment Limitation Being Applied for VoIP Infrastructure Applications Architecture is Too Simple Single Gateway to Interact with PSTN/GSM Sui

12、table for Peer to Peer Communication Protocol is Too Complex Complicated Call Set-Up Signaling Hard to Extend Signaling Is Not Enough Only DTMF is Specified No SS7 Signaling Capability Advanced Services are Limited Interoperability is Still an Issue,Gateway Decomposition,Media Gateway Control,IPDC:

13、IP Device Control Protocol SGCP: Simple Gateway Control Protocol,MGCP: Media Gateway Control Protocol MDCP: Media Device Control Protocol,MEGACO: Media GAteway Control (IETF Working Group),MGCP/MEGACO/H.248,Client-Server Architecture Call Agent (Media Gateway Controller) Call Control Server Media Ga

14、teway Dedicated for Media Transmission Trunk/Access/Residential GWs Signal Gateway SS7 Interfacing,ISUP/MGCP/SIP Interworking,SS7 over IP,Softswitch System Architecture,What is A Softswitch ?,Software, hardware and applications solutions typically come packaged in a single (proprietary) box. Non-sta

15、ndard solutions are expensive to implement and leave little room for innovation.,Circuit-Switched,Solutions are open standards-based products, and can come from multiple vendors. Customers are free to choose best-in-class products to build their network. Open standards enable innovation and in the l

16、ong run can reduce costs,Soft-Switched,Wireless System - From GSM to GPRS,Always-On Wireless Packet Data Services,IP Multimedia in 3G All-IP System,Applications . - ; ,... - NAPTR RRs (ldap URL),LDAP DB,.,Tier 1,Tier 2 (Designated by the end user),4.3.2.

17、..8. - ; ,Tier 3 (Depending on the application),6.8.8. - ,Tier 0 (RIPE),.,..6.8.8. - ; ,/,ldap URL,Source: James Yum, Neustar,.,ENUM Scenario,IP Network,Softswitch,SIP Proxy,IAD,ENUM Se

18、rver,E-Mail Server,1,5,Dial:03-5915616,2,SIP Phone,3,3,0910961527,4,User Dial Tel. No ENUM Query, get 3 URIs Make SIP Call, No Answer Make Mobile Call, Fail Connect to E-Mail,DNS,$ORIGIN ..6.8.8.. IN NAPTR 100 10 “u” “sip+E2U” “!.*$!sip:.tw!” IN NAPTR 1

19、02 10 “u” “tel+E2U” “!.*$!tel:+886910961527!” IN NAPTR 102 10 “u” “mailto+E2U” “!.*$!mailto:.tw!”,Media Gateway,Signal Gateway,Enum Record,ENUM Scenario (cont.),User Make Call to E.164 Number: 03-5915616 Softswitch Translates the E.164 Number to Query Input to ENUM Server: .1.9.

20、.8. and gets a list of URIs returned The Softswitch Processes the 1st URI Record, Query DNS to get the IP Address of Host: .tw Make SIP Call to SIP Phone of slchou through SIP Proxy SIP Phone Does not Answer The Softswitch Processes the 2nd URI Record, Make PSTN Cal

21、l Through Gateway to 0910961527 0910961527 Does not Answer The Softswitch Processes the 3rd URI Record, Query DNS to get the IP Address of Host: .tw Connect the Caller E-Mail Server SMTP Protocol Caller Leave the E-Mail Message,ENUM Administration Issue,Registry vs. Registrar,Registry Runs t

22、he DNS server for a specific domain name one domain - one registry Registrar Provide ENUM Registration to ENUM Users So that Users Need Not to Contact Registry Registrar verify customer data, do billing, and send data to registry when delegation is to be done, changed or cancelled,ITU-T ENUM Activit

23、ies,ITU-T Study Group 2 Interim Procedures for Use of the ARPA Domain Approved in May, 2002 Interim procedures for delegation of E.164 country codes into ARPA domain before Approval of E.A-NUM RIPE-NCC is Authorized by ITU-TSB to Perform such Delegation at this Stage ,IETF ENUM Activities,Telephone

24、Number Mapping (ENUM) WG RFC 2916, “E.164 number and DNS” RFC 2915, “The naming authority pointer (NAPTR) DNS resource record”, August, 2000 RIPE-NCC Related ENUM Activities after RFC 2916 Update RFC to reference the DDDS RFC2916bis,”The E.164 to URI DDDS Application” ENUM Administrative and Operati

25、onal Procedures Registration and Provisioning, Validation and Authentication Operational Privacy, Security Issues and Procedure IETF Liaison with ITU-T SG2 New Issues Being Considered: Extent Same URI in RFC 2916 for Different Service e.g., 2 SIP URIs but one for voice and one is instant messaging,I

26、ETF ENUM Activities (cont.),Related ENUM Activities after RFC 2916 (Cont.) SIP vs. ENUM Services, e.g., distinction the location provided by SIP and ENUM Adding Presence as an ENUM service Extension of ENUM service tel URI Location Number Portability, using DNS as the source Extensible Provisioning

27、Protocol (EPP) in PROVREG WG, IETF,More Than Number Translation,One E.164 Number to Multiple URIs Multiple NAPTR service: URI Multiple IP Services Behind one ENUM sip, tel, ifax, mms, ems, sip, e-mail, Service Realization Mechanism in IP World Service Realization for ASP Service Selection Service Ma

28、nagement for ENUM Users Web-based Service Management for ENUM Users Service Applied Dynamically,ENUM-enabled Opportunities,ASP / ISP / WISP Network service providers independent ADSL + WLAN as the access network VoIP to acquire user base Two key enablers: VoIP phone numbers, IP telephony voice quali

29、ty criteria (Class A, Class B, Class C) ENUM-enabled IP services to generate revenue Cellular operators To create time-to-market cost-effective niche applications with IP/ENUM-enabled application servers (e.g. movie stars chatting rooms, MMS) Fixed network operators who lacks first miles ADSL/Cable

30、+ VoIP as the access network,DOC/NTIA Backs ENUM,NTIA(National Telecommunications Cellular Operators Currently, Internet Service is the Major Application for WLAN High Bandwidth Not the Key Point High Bandwidth Applications for Mobile Users ? For New Applications ? What New WLAN Specific Contents /A

31、pplications ? Other Than Wired Broadband Internet Services? Mobility & Cable Replacement,How WLAN Operate ?,Private WLAN Owners Dedicated for Internal Internet/Intranet Access Allied with Public WLAN Service Providers ? Public WLAN Owners WISP: WLAN Internet Service Providers Very Hard to Be Profita

32、ble as Independent WISP Roaming, Billing/Charging, Customer Base, Issues Cellular Owners Supplementary to GPRS/3G Cellular Network Treat WLAN like GPRS to GSM Help to Make Money from GSM Extend Services to WLAN,WLAN and Cellular Operators,Operators Inherent Advantages Extensive Roaming Agreements /

33、Unified Billing Secure Authentication System Ability to Provide GPRS/3G/CDMA2000 - to - WLAN Roaming Large Potential Users Base (GSM/GPRS Users) Mobile Operators are Leading WLAN Service Worldwide except in U.S.,How to Build WLAN Networkfor Cellular Operators ?,Self Installation Wholly ? Hard to Bui

34、ld to Have Good Coverage Alliance with Any other WLANs Home WLAN Enterprise WLAN Public WLAN Leverage Home WLAN Capability Networking Home WLAN Alliance with Private WLANs Important Way to Build Ubiquitous Public WLAN Enterprise/Campus WLANs Roaming with Other Public WLANs Roaming Service Aggregator

35、,Alliance with Private WLANs,Private WLAN Parasitic Grid Deployment and Ownership Individual (Home WLAN)/Community/Enterprise/ Organization/University Deployed for Private Use Originally Private AAA Mechanism for Itself Users Motivation to Ally to Ubiquitous Public WLAN to Provide Public WLAN/Intern

36、et Service Access Capability is Usually Large Enough Benefit from the Alliance Security Issue Must be Solved,Alliance with Private WLANs,WLAN Alliance,Alliance,Private WLAN,Private Users Profile,Intranet,Private AAA,WLAN Users Profile,Internet,GSM/GPRS Authentication & Billing System,Visitors Access

37、ing Public WLAN,Private Users,WLAN and Cellular Operators,Swisscom (Switzerland) PWLAN Service Launched Dec. 2002 100 Hotspots Prepaid US$ 146 for 436 Hours “Indirect” SIM-based Authentication Orange Switzerland Trial Pure SIM-based WLAN Authentication TogewaNets WeRoam Solution Pure SIM-based Authe

38、ntication Roaming between PWLAN Operators Have to Install S/W in Access Server and End-user Device (with USB SIM Reader) WeRoam also Support Pure RADIUS-based System (without SIM Card),WLAN and Cellular Operators,Orange France Wi-Fi complementary to GPRS and UMTS Wi-Fi: Laptops and PDAs UMTS: Handse

39、ts Strategy: Integrated Cellular/PWLAN Services Services and Authentication Prepaid: RADIUS Subscription: SIM-based 400 (large)/ 1000-2000 (small) Hotspots, End 2003 Two-tier Deployment Strategy Own and Operate Major Sites Encourage Small Sites - Turkey Hotspot Service 1000 Installation + 160 Operat

40、ion Cost (Euro) Orange take care of virtually all aspects of hotspot services and offer sites an undisclosed commission on sales of prepaid cards.,WLAN/Cellular Integration,Tight Coupling WLAN Emulate as Cellular Access Network (e.g. RNC) Pro Fully Leverage Cellular Capability Seamless Service Conti

41、nuity Mobility Management Con Big Change on WLAN System GPRS CN for WLAN,SGSN,GGSN,GPRS/3G Access Network,WLAN,GPRS/3G Core Network,HLR/ HSS,Internet,WLAN/Cellular Integration,Loose Coupling Separate Data and Signaling Pro Simple to Implement WLAN/Internet Access is Simple and Direct Con Session/Ser

42、vice Continuity Mobility/Charging Integration/Service Extension,SGSN,GGSN,GPRS/3G Access Network,WLAN,GPRS/3G Core Network,HLR/ HSS,Internet,Cellular/WLAN Integration,Mobile Devices,Cellular GSM/GPRS, PHS Handset Access Cellular Service Only Cellular/WLAN Dual Mode Devices With Cellular/WLAN Access

43、Capability, e.g. Smart Phone, PDA, Challenge Issues Power Management What Applications Hand-over ? SIM-Equipped WLAN Devices Accessing WLAN via Cellular Authentication & Billing E.g. Notebook, PC, ,Access and Networking,WLAN Access Coverage/Mobility/Security/ Roaming among Public WLANs Cellular/WLAN

44、 Networking Identical Authentication & Billing System SIM-based (HLR) Authentication Existing Cellular Billing System Service Supporting New Service over Integrated Cellular/WLAN Networks Negotiation between Cellular and WLAN Networks Real-time Handover,Services for Cellular/WLAN,Common Services to

45、both Cellular and WLAN MMS - Cellular Service Extension to Cellular/WLAN Integration MMS to/from PDA, NB, PC on WLAN IM MMS Interworking VoIP - New Services Created for Cellular/WLAN Cellular Voice VoIP Cellular Call VoIP to PDA, NB, Home GW Location-Based Service WLAN Specific Services Existing Int

46、ernet Service New Service Specific to WLAN Users Video Streaming ? Any Others ?,3GPP Interworking Scenarios,Scenario 1 - One Subscription Common Billing and Customer Care to Customers No Real Interworking % WLAN & GPRS Networks Scenario 2 - Cellular-based Access Control and Charging SIM-Based Authen

47、tication Enable WLAN IP Network Access for GPRS Users Scenario 3 - Cellular Service Extension to WLAN GPRS Services to WLAN WAP, IP Multimedia, Location-based, Instant Messaging Services, etc. No Service Continuity across GPRS and WLAN Networks,3GPP Interworking Scenarios,Scenario 4 - Service Contin

48、uity (Loose) Accessed Services Keep Continued when Crossing the Networks Handover, QoS Change, Service may Terminate after Handover to WLAN Due to Different Service Requirements in Different Networks Scenario 5 - Seamless Services (Stringent) Seamless Service Continuity Users Notice Little Differenc

49、es when Crossing Networks Scenario 6 - 3GPP CS Service to WLAN E.g. Voice call to WLAN (VoIP),Implementation of Integration,One-Time Password,Implementation of Integration,SIM-Based Authentication Server Seamlessly Integrate WLAN with Cellular Networks Authentication and Billing Solutions for System

50、s with/without 802.1x Supporting,WLAN,DHCP/NAT/GW,Internet,Enterprise AAA,AAA Proxy,AS,Billing System,HLR/ Auc,Home PLMN,Gr,Radius,FTP,ME,Interworking without 802.1x,Interworking with 802.1x,AAA Proxy,AP,AP,ME,SIM,AS,CG,HLR,AuC,Internet,Enterprise WLAN,Home PLMN,Gr,GTP,Radius,Radius,EAPOL,Conclusion

51、,Huge WLAN Will be Installed Shortly Internet Service & Cable Replacement will be the Killer Applications of WLAN for a Long Time Its Hard to Find WLAN-specific Killer Application in Short Term Independent WISP is Hard to Survive Cellular Operator Own Inherently Advantages to Interworking with WLAN

52、for Providing Public WLAN Services How to Leverage Private WLANs to Construct A Logical WLAN Network with Wide Coverage will be the Key to Success for Cellular Operators,Mobile Presence and Instant Messaging,References: Theo G. Kanter, Mobile Presence: Architectures, Protocols, and Applications, Lec

53、ture note Sinnreich & Jonhston, Presence and Instant Communications “SIP for Next Generation Mobile Service”,By Jim Nelson, dynamicSoft 江為國, 黃俊堯, 陳肯力, “Mobile Presence Service Technologies” 3GPP TR 23.841 V6.0, “Presence Service, Architecture and Functional Description),Presence and Instant Messaging,Presence Notifications of a Person Availability and Status Directly to the Recipient Web-Presence Messaging Instant Messaging Chat Store & Forward SMS & MMS Message Center,Parameters of Presence Service,Presence Who is available ? Location Where are they ? Call State Are they busy in a call ?