International Telecommunication Union. Evolution to NGN. Ghassem Koleyni. Nortel Networks

Transcription

1 International Telecommunication Union Evolution to NGN Ghassem Koleyni Nortel Networks

2 Evolution & Revolution ITU-T Evolution (Migration) A gradual process of change and development Abrupt (Revolution) A rapid process of change and development 2

3 ITU-T What is Expected of the Evolution to NGN -I o Scalability o Higher reliability and trustworthiness o Higher resiliency o Security o Robustness o Performance o Ubiquity o Simplified authentication and billing 3

4 ITU-T What is Expected of the Evolution to NGN -II o Richness in content and application o Common services infrastructure o Simplified service deployment o Higher capacity o Interoperable o Operable between Fixed, Mobile, Copper, Fibre, Wireless. o Multimedia 4

5 ITU-T What is Expected of the Evolution to NGN -III o Mix of traditional circuit switched communication services and IP services o End-to-end interactivity o User control o Affordable To achieve these expectations there is a need for: Compliance of Networks to Sets of Globally Recognized Open Standards 5

6 ITU-T FGNGN Evolution Working Group (WG6) Where, at present, sets of drafts on the evolution of PSTN/ISDN to NGN are being produced Our mandate: To prepare a set of standards to drive the evolution of existing s towards NGN, taking into consideration that there are potentially different approaches. This work is undertaken based on aspect of evolution and interworking principles. 6

7 WG6 Activities ITU-T o Evolution of s to NGN o PSTN/ISDN emulation o PSTN/ISDN simulation o Mixture of emulation and simulation o Interworking between PSTN/ISDN and Simulated PSTN/ISDN o Emulation and Simulation when s are involved 7

8 Evolution of Networks to NGN ITU-T Major investment has been made in existing s. Today s mix of technologies has produced different life span and thus amortization times for different parts of the s. Thus, complete replacement of the legacy s to NGN is neither advisable nor possible. So, a phased approach needs to be considered. 8

9 Note on the following configurations ITU-T othe following are a subset of scenarios presently under discussion in FGNGN. The relationship between the entities identified in the scenarios and those defined in the NGN framework architecture is work in progress othe intent is to use existing protocols to advantage. Protocol extensions or evolution would continue to be handled as they are today. 9

10 ITU-T A Step-by-Step Evolution Scenario - I PSTN TE TE TE R PSTN TE TE TE R CS R AG Packet Based Network AG R TG SG voice signaling VoIP BEARER D SIGNALING TRAFFIC FROM OTHER OPERATOR S PSTN/ISDN 10

11 ITU-T A Step-by-Step Evolution Scenario - II PSTN TE TE TE PSTN TE TE TG CS SG TG AG Packet Based Network AG AG AG AG CS Packet Based Network AG AG TG BEARER D SIGNALING TRAFFIC FROM OTHER OPERATOR S PSTN/ISDN SG voice signaling VoIP 11

12 PSTN/ISDN Emulation & Simulation ITU-T Emulation oprovision of PSTN/ISDN service capabilities and interfaces using adaptation to an IP infrastructure. Simulation oprovision of PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure 12

13 PSTN/ISDN Emulation ITU-T IF IF Originating legacy terminal NGN Terminating legacy terminal 13

14 PSTN/ISDN Simulation ITU-T IF 1 IF 2 IF 3 IF 4 IF 4 IF 3 IF 2 IF 1 NGN NGN NGN NGN NGN NGN NGN End system Originating Originating Transit Originating Subscriber s home Core Transit Terminating Subscriber s home Terminating Transit Terminating End system 14

15 ITU-T Combination of PSTN/ISDN Emulation & Simulation IFx IFy NGN 15

16 ITU-T Interworking Between PSTN/ISDN and Simulated PSTN/ISDN IF x IF y IF 4 IF 3 IF 2 IF 1 ISDN/PSTN NGN NGN NGN NGN End System Core Transit Terminating Subscriber s home Terminating Transit Terminating End System 16

17 ITU-T PSTN/ISDN Simulation Involving s IF4 IF2 IF3 IF2 IF1 NGN NGN NGN NGN NGN Originating Originating subscriber s home Terminating subscriber s home Terminating 17

18 So, NGN Would Be! ITU-T Multimedia Integrated voice, video and data Ubiquitous Anywhere, Anytime Evolved Network Secure Trustworthy Network Interactive end-to-end 18

19 And Finally. ITU-T The future is an access- and locationindependent, secure, packet-based telecommunications infrastructure that synergistically delivers on maximizing the strengths of both the Internet and the Legacy Infrastructures 19

20 List of Acronyms ITU-T AG CS ISDN PSTN QoS R SG TE TG Access Gateway Access Network Call Server Integrated Services Digital Network Local Exchange Private Branch Exchange Public Switched Telephone Network Quality of Service Remote User Access Module Signalling Gateway Transit Exchange Transit Gateway User Access Module 20

21 ITU-T Thank you for your attention 21