ITU-T Y 2261-2006 PSTN ISDN evolution to NGN《PSTN ISDN竞争到NGN》.pdf
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1、 International Telecommunication Union ITU-T Y.2261 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2006) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS Next Generation Networks Service aspects: Interoperability of services and networks in NGN
2、 PSTN/ISDN evolution to NGN ITU-T Recommendation Y.2261 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT- GENERATION NETWORKS GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.30
3、0Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network
4、capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 NEXT GENERATION NETWORKS Frameworks and func
5、tional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Numbering, naming and addressing Y.2300Y.2399 Network man
6、agement Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Y.2261 (09/2006) i ITU-T Recommendation Y.2261 PSTN/ISDN evolution to NGN Summary T
7、his Recommendation describes principle aspects of evolving PSTN/ISDN to NGN. Evolution of PSTN/ISDN to NGN, based on IP multimedia sub-system (IMS-based) and call server, (CS-based) is described. It mainly describes evolution of transport parts of PSTN/ISDN to NGN. Some evolution scenarios are also
8、provided in appendices. Source ITU-T Recommendation Y.2261 was approved on 13 September 2006 by ITU-T Study Group 13 (2005-2008) under the ITU-T Recommendation A.8 procedure. Keywords Access gateway, Access network, Application server, Call server, Evolution, ISDN, NGN, PSTN. ii ITU-T Rec. Y.2261 (0
9、9/2006) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questi
10、ons and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations
11、on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, th
12、e expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or appl
13、icability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with
14、the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applica
15、bility of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to impleme
16、nt this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any mean
17、s whatsoever, without the prior written permission of ITU. ITU-T Rec. Y.2261 (09/2006) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 3 5 Conventions 5 6 PSTN/ISDN evolution to NGN 5 7 Aspects to consider when evolving to NGN. 5 7.1 Transport. 5 7.2 Signalling and contro
18、l. 6 7.3 Management. 6 7.4 Services. 6 7.5 Operation, administration and maintenance (OAM) 7 7.6 Naming, numbering and addressing. 7 7.7 Accounting, charging and billing . 7 7.9 Call routing. 9 8 Service requirements by national regulatory bodies. 9 9 Emergency telecommunications in NGN . 10 10 Secu
19、rity aspects of evolution 10 Appendix I Examples of network evolution scenarios . 11 I.1 Core network evolution to NGN 11 I.2 Access network evolution. 17 I.3 Signalling and control scenarios. 19 I.4 Management scenarios . 19 I.5 Services evolution scenarios. 20 Appendix II Examples of PSTN/ISDN ser
20、vice evolution 24 Appendix III Billing system evolution scenarios 25 BIBLIOGRAPHY 26 ITU-T Rec. Y.2261 (09/2006) 1 ITU-T Recommendation Y.2261 PSTN/ISDN evolution to NGN 1 Scope A public switched telephone network or integrated services digital network (PSTN/ISDN) being one of the networks in teleco
21、mmunication is considered to be a prime candidate for evolution to the next generation network (NGN) Y.2001 and Y.2011. Because of the widespread deployment and the use of PSTN/ISDN, evolution to NGN should be considered as a step-wise approach. This Recommendation describes possible ways of evolvin
22、g PSTN/ISDN to NGN. Both the IP multimedia sub-system (IMS-based) and call server (CS-based) are described. It describes aspects, which need to be considered including evolution of transport, management, signalling and control parts of PSTN/ISDN to NGN. Evolution scenarios are also provided in appen
23、dices. Administrations may require operators and service providers to take into account national regulatory and national policy requirements in implementing this Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this
24、text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent editio
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