1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Y.2011TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2004) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT GENERATION NETWORKS Next Generation Networks Frameworks and functional architecture models General principles a
2、nd general reference model for Next Generation Networks ITU-T Recommendation Y.2011 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.20
3、0Y.299 Network aspects Y.300Y.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 Arc
4、hitecture, access, network 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 N
5、ETWORKS Frameworks and functional 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 addressi
6、ng Y.2300Y.2399 Network management 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.2011 (10/2004) i ITU-T Recommendation Y.2011 General p
7、rinciples and general reference model for Next Generation Networks Summary This Recommendation specifies general principles and a general reference model for Next Generation Networks. Source ITU-T Recommendation Y.2011 was approved on 7 October 2004 by ITU-T Study Group 13 (2001-2004) under the ITU-
8、T Recommendation A.8 procedure. Keywords Architecture, basic reference model, general functional model, Global Information Infrastructure (GII), layers, Next Generation Network (NGN), protocol models, stratum. ii ITU-T Rec. Y.2011 (10/2004) FOREWORD The International Telecommunication Union (ITU) is
9、 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 questions and issuing Recommendations on them with a view to standardizin
10、g 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 on these topics. The approval of ITU-T Recommendations is covered b
11、y 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, the expression “Administration“ is used for conciseness to indicate b
12、oth 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 applicability) and compliance with the Recommendation is achieved when
13、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 the Recommendation is required of any party. INTELLECTUAL PROPERTY
14、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 applicability of claimed Intellectual Property Rights, whether asserted by
15、 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 implement this Recommendation. However, implementors are cautioned that th
16、is may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Y.2011 (10/2004) iii CONTENTS
17、 Page 1 Scope 1 2 References. 1 3 Terms and Definitions 2 4 Abbreviations and Acronyms . 3 5 Relationship to Global Information Infrastructure . 4 6 Relationship to ITU-T Rec. X.200 OSI Basic Reference Model 4 7 Basic functionality divisions in NGN. 5 7.1 Separation between services and transport. 5
18、 7.2 Relationships between NGN basic reference model and ITU-T Recs G.805, G.809 and Y.110. 8 8 General functional model . 8 8.1 Functions 10 8.2 Resources 11 9 Multi-layer aspects . 11 9.1 Inter-layer and intra-layer interaction. 12 9.2 Co-ordination activities 13 9.3 Multi-layer network scenario i
19、n NGN 13 10 Service convergence by NGN 14 11 Multimedia services 15 11.1 The support of multimedia services . 15 11.2 The access to the services and the support (of the services) requests 15 12 Identification and location 16 13 Emergency communications. 17 14 Interactions between NGNs and non-NGN en
20、vironments . 18 15 Security. 18 16 Quality of Service (QoS) 18 16.1 QoS classes. 18 16.2 QoS control mechanisms 18 16.3 QoS control functional architecture 19 16.4 QoS control/signalling 19 Annex A Relationship of NGN to OSI BRM . 20 A.1 Distribution of layer functionality 20 A.2 Ordering of protoco
21、l layers 20 A.3 Peer semantics of layers . 20 A.4 Mode of transmission . 20 iv ITU-T Rec. Y.2011 (10/2004) Page Annex B Principles retained/not retained from X.200 for NGN 21 B.1 X.200 parts applicable to NGN 21 B.2 X.200 parts not applicable to NGN 22 Appendix I Example of convergence of services 2
22、2 I.1 Service scenario 22 I.2 System configuration 22 Appendix II Interactions between NGNs and non-NGN environments . 24 II.1 Introduction 24 II.2 Principle for IWF between NGNs 24 II.3 Agent model for interworking 25 BIBLIOGRAPHY 26 ITU-T Rec. Y.2011 (10/2004) 1 ITU-T Recommendation Y.2011 General
23、 principles and general reference model for Next Generation Networks 1 Scope The seven layered Open Systems Interconnection Basic Reference Model (OSI BRM) as described in ITU-T Rec. X.200 1 has long provided a basis for a model of communication, and the general principles still apply. However, the
24、layering and protocol hierarchy defined in the OSI BRM cannot be directly applied in the Next Generation Network (NGN) environment and have to be interpreted in specific ways to accommodate the NGN environment. This Recommendation describes general principles applicable to Next Generation Networks (
25、NGNs) as well as a Basic Reference Model for NGNs, based on the generic foundations first laid down under the Global Information Infrastructure (GII) in ITU-T Recs Y.100 2 and Y.110 3, and basic communication architecture principles specified in ITU-T Rec. X.200 1. The general reference architecture
26、 model described in this Recommendation should enable the support of the overall NGN characteristics as given in ITU-T Rec. Y.2001 4. In particular, it is neutral with respect to specific protocols and/or technologies. It is more flexible than ITU-T Rec. X.200 1 with respect to the positioning of fu
27、nctionality, and is not constrained to a specific hierarchical ordering of protocol layers. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the ed
28、itions 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 edition of the Recommendations and other references listed below. A list of the currently va
29、lid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 1 ITU-T Recommendation X.200 (1994) | ISO/IEC 7498-1:1994, Information technology Open Systems Interconnection Basic R
30、eference Model: The basic model. 2 ITU-T Recommendation Y.100 (1998), General overview of the Global Information Infrastructure standards development. 3 ITU-T Recommendation Y.110 (1998), Global Information Infrastructure principles and framework architecture. 4 ITU-T Recommendation Y.2001 (2004), G
31、eneral overview of NGN. 5 IETF RFC 791 (1981), Internet Protocol DARPA Internet Program Protocol Specification. 6 ITU-T Recommendation G.805 (2000), Generic functional architecture of transport networks. 7 ITU-T Recommendation G.809 (2003), Functional architecture of connectionless layer networks. 8
32、 ITU-T Recommendation I.322 (1999), Generic protocol reference model for telecommunication networks. 2 ITU-T Rec. Y.2011 (10/2004) 9 ITU-T Recommendation G.993.1 (2004), Very high speed digital subscriber line transceivers. 10 ITU-T Recommendation G.807/Y.1302 (2001), Requirements for automatic swit
33、ched transport networks (ASTN). 11 ITU-T Recommendation G.8080/Y.1304 (2001), Architecture for the automatically switched optical network (ASON), plus Amendment 1 (2003). 12 ITU-T Recommendation Y.1241 (2001), Support of IP-based services using IP transfer capabilities. 13 ITU-T Recommendation Y.171
34、1 (2004), Operation and maintenance mechanism for MPLS networks. 14 IETF RFC 3471 (2003), Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description. 15 ITU-T Recommendation M.3010 (2000), Principles for a telecommunications management network. 16 ITU-T Recommendation M.3010
35、 Amendment 1 (2003), TMN conformance and TMN compliance. 17 ITU-T Recommendation M.3400 (2000), TMN management functions. 18 ITU-T Recommendations M.3050.x series (2004), Enhanced Telecom Operations Map (eTOM). 19 ITU-T Recommendation X.700 (1992), Management framework for Open Systems Interconnecti
36、on (OSI) for CCITT applications. 20 ITU-T Recommendation X.701 (1997) | ISO/IEC 10040:1998, Information technology Open Systems Interconnection Systems management overview. 21 ITU-T Recommendation H.323 (2003), Packet-based multimedia communications systems. 22 IETF RFC 3261 (2002), SIP: Session Ini
37、tiation Protocol. 23 IETF RFC 2616 (1999), Hypertext Transfer Protocol HTTP/1.1. 24 ITU-T Recommendation Y.130 (2000), Information communication architecture. 25 ITU-T Recommendation Y.1541 (2002), Network performance objectives for IP-based services. 26 IETF RFC 2205 (1997), Resource ReSerVation Pr
38、otocol (RSVP) Version 1 Functional Specification. 27 IETF RFC 2748 (2000), The COPS (Common Open Policy Service) Protocol. 28 IETF RFC 793 (1981), Transmission Control Protocol DARPA Internet Protocol Protocol Specification. 29 ITU-T Recommendation Y.1251 (2002), General architectural model for inte
39、rworking. 3 Terms and Definitions This Recommendation defines or uses the following terms: 3.1 application services: See ITU-T Rec. Y.110 3. 3.2 baseware services: See ITU-T Rec. Y.110. ITU-T Rec. Y.2011 (10/2004) 3 3.3 control plane: The set of functions that controls the operation of entities in t
40、he stratum or layer under consideration, plus the functions required to support this control (see 8.1.1 for some details). 3.4 data plane: The set of functions used to transfer data in the stratum or layer under consideration. 3.5 horizontal relationship: See ITU-T Rec. Y.110. 3.6 infrastructural se
41、rvices: See ITU-T Rec. Y.110. 3.7 management plane: The set of functions used to manage entities in the stratum or layer under consideration, plus the functions required to support this management (see 8.1.2 for some details). 3.8 middleware services: See ITU-T Rec. Y.110. 3.9 NGN service stratum: T
42、hat part of the NGN which provides the user functions that transfer service-related data and the functions that control and manage service resources and network services to enable user services and applications (see also 7.1). 3.10 NGN transport stratum: That part of the NGN which provides the user
43、functions that transfer data and the functions that control and manage transport resources to carry such data between terminating entities (see also 7.1). 3.11 player: See ITU-T Rec. Y.110. 3.12 role: See ITU-T Rec. Y.110. 3.13 user plane: A synonym for data plane. 3.14 vertical relationship: See IT
44、U-T Rec. Y.110. 4 Abbreviations and Acronyms This Recommendation uses the following abbreviations: 3GPP 3rd Generation Partnership Project ADSL Asymmetric Digital Subscriber Line ASON Automatic Switched Optical Network ATM Asynchronous Transfer Mode BRM Basic Reference Model COPS Common Open Policy
45、Service FCAPS Fault, Configuration, Accounting, Performance and Security FTTH Fibre to the Home GII Global Information Infrastructure GMPLS Generalized Multi-Protocol Label Switching HDTV High Definition Television HTTP Hypertext Transfer Protocol IETF Internet Engineering Task Force IP Internet Pro
46、tocol IWF Interworking Function IWU Interworking Unit 4 ITU-T Rec. Y.2011 (10/2004) MFA Management Functional Area MPLS Multiprotocol Label Switching NAT Network Address Translation NGN Next Generation Network NGN BRM Next Generation Network Basic Reference Model NNI Network to Network Interface OSI
47、 Open Systems Interconnection OSI BRM Open Systems Interconnection Basic Reference Model PLMN Public Land Mobile Network POA Point of Attachment PSTN Public Switched Telephone Network QoS Quality of Service RSVP Resource Reservation Protocol SIP Session Initiation Protocol TCP Transmission Control P
48、rotocol TE Terminal Equipment TMN Telecommunications Management Network UMTS Universal Mobile Telecommunications System UNI User to Network Interface VDSL Very high speed Digital Subscriber Line 5 Relationship to Global Information Infrastructure The Global Information Infrastructure (GII) environme
49、nt creates a more heterogeneous mix of technological and operational domains. Choices of core technologies can vary and a full set of services is being provided, by, say, a multi-service network. Consequently an end-to-end path may traverse many varied technologies encompassing a variety of protocol arrangements. This Recommendation builds upon the GII environment described in ITU-T Rec. Y.100 2, the GII Overview, and, in particular, the concept of “federation
