1、 International Telecommunication Union ITU-T Series YTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 17(02/2012) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS ITU-T Y.2200-series Functional model of a service overlay network framework
2、which uses the next generation network ITU-T Y-series Recommendations Supplement 17 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 IPTV over NGN Y.1
5、900Y.1999 NEXT GENERATION NETWORKS 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 Num
6、bering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOU
7、D COMPUTING Y.3500Y.3999 For further details, please refer to the list of ITU-T Recommendations. Y series Supplement 17 (02/2012) i Supplement 17 to ITU-T Y-series Recommendations ITU-T Y.2200-series Functional model of a service overlay network framework which uses the next generation network Summa
8、ry Supplement 17 to ITU-T Y.2200-series Recommendations provides a functional model of a service overlay network (SON) which uses NGNs. It identifies SON service capability functions and also provides a number of operating scenarios which may be used to provide enhanced NGN applications. History Edi
9、tion Recommendation Approval Study Group 1.0 ITU-T Y Suppl. 17 2012-02-17 13 Keywords NGN, service overlay network, SON. ii Y series Supplement 17 (02/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, informati
10、on and communication technologies (ICTs). 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 standardizing telecommunications on a worldwi
11、de 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 by the procedure laid down in WTSA
12、 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 publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administrati
13、on and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions are met.
14、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 publication is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility
15、that the practice or implementation of this publication 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 ITU members or others outside of the publication
16、 development process. As of the date of approval of this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementers are cautioned that this may not represent the latest information and are theref
17、ore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Y series Supplement 17 (02/2012) iii Table of Contents Page 1 Scop
18、e 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Supplement 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 Overview of service overlay networks (SONs) 3 6.1 Introduction to SON . 3 6.2 SON functional positioning 5 7 SON functional framework 6 7.1 SON fu
19、nctional model 6 7.2 SON functional description 8 8 SON service features 9 8.1 Service control 9 8.2 Service composition . 10 8.3 Application-aware provisioning . 10 8.4 QoS-aware provisioning . 10 8.5 Context-aware provisioning . 11 8.6 Service mobility 11 8.7 Security management . 11 9 SON-based s
20、ervice scenarios 12 9.1 IPTV service scenario using SONs 12 9.2 Community-based service scenario using SONs 12 9.3 Virtual home network service using SON 13 9.4 Cloud computing service provisioning using SON 13 Appendix I QoS-aware provisioning in SONs 15 Appendix II Security-aware provisioning in S
21、ONs 16 II.1 Security-aware SON scenario for authentication . 16 II.2 Basic concept of security-aware SON for the authentication mechanism . 17 II.3 Flow diagram of security-aware provisioning in the security management function . 17 Appendix III Service scenario for IPTV in SONs 19 Appendix IV Colla
22、boration scenario between cloud computing services and SONs . 21 Appendix V Software as a service (SaaS) in cooperation with SONs 23 Appendix VI Platform as a service (PaaS) using SONs . 25 Bibliography. 27 iv Y series Supplement 17 (02/2012) Introduction A service overlay network (SON) is a virtual
23、 or logical service network which possesses a number of specific functions, lies on top of and utilizes existing transport networks and provides support for various types of services beyond those normally offered by the transport network. SONs are designed to provide and dynamically utilize applicat
24、ion features in accordance with users demands. The application features are provided via the use of a composition function, which can be used to develop user service capabilities in SONs in response to users needs. Y series Supplement 17 (02/2012) 1 Supplement 17 to ITU-T Y-series Recommendations IT
25、U-T Y.2200-series Functional model of a service overlay network framework which uses the next generation network 1 Scope This Supplement defines a functional framework and service features for service overlay networks (SONs) which use the next generation network (NGN). It also provides a number of S
26、ON service scenarios. 2 References ITU-T Y.2012 Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next generation networks. 3 Definitions 3.1 Terms defined elsewhere This Supplement uses the following terms defined elsewhere: 3.1.1 application b-ITU-T Y.2261: A structur
27、ed set of capabilities, which provide value-added functionality supported by one or more services, which may be supported by an API interface. 3.1.2 application network interface (ANI) ITU-T Y.2012: Interface which provides a channel for interactions and exchanges between applications and NGN elemen
28、ts. The ANI offers capabilities and resources needed for realization of applications. 3.1.3 functional architecture ITU-T Y.2012: A set of functional entities and the reference points between them used to describe the structure of an NGN. These functional entities are separated by reference points,
29、and thus, they define the distribution of functions. 3.1.4 mobility b-ITU-T Q.1706: The ability for the user or other mobile entities to communicate and access services irrespective of changes of the location or technical environment. 3.1.5 multicast b-ITU-T X.603: A data delivery scheme where the s
30、ame data unit is transmitted from a single source to multiple destinations in a single invocation of service. 3.1.6 next generation network (NGN) b-ITU-T Y.2001: A packet-based network able to provide telecommunication services and able to make use of multiple broadband, QoS-enabled transport techno
31、logies and in which service-related functions are independent from underlying transport-related technologies. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users. 3.1.7 NGN service stratum b-ITU-T Y.2011: That part of the NGN which provides the
32、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. 3.1.8 NGN transport stratum b-ITU-T Y.2011: That part of the NGN which provides the user functions that transfer data and the f
33、unctions that control and manage transport resources to carry such data between terminating entities. 2 Y series Supplement 17 (02/2012) 3.1.9 nomadism b-ITU-T Q.1706: The ability of the users to change their network access point on moving. When changing the network access point, the users service s
34、ession is completely stopped and then started again, i.e., there is no service continuity or hand-over used. It is assumed that normal usage pattern is that users shut down their service session before attaching to a different access point. 3.1.10 overlay network b-ITU-T Y-Sup.10: A network of nodes
35、 and logical links that is built on top of the underlying, e.g., transport, network with the purpose of providing a network service that is not available in the underlying network. 3.1.11 peer-to-peer (P2P) b-ITU-T Y.2206: A system is considered to be P2P if the nodes of the system share their resou
36、rces in order to provide the service the system supports. The nodes in the system both provide services to other nodes and request services from other nodes. 3.1.12 quality of experience (QoE) b-ITU-T P.10 Amd.2: The overall acceptability of an application or service, as perceived subjectively by th
37、e end-user. Quality of experience includes the complete end-to-end system effects (client, terminal, network, services infrastructure, etc.). Overall acceptability may be influenced by user expectations and context. 3.1.13 service composition b-ITU-T Y.2234: Service composition is the capability of
38、creating new services from other existing services. 3.1.14 service node interface (SNI) ITU-T Y.2012: Interface which provides a channel for interactions and exchanges between a NGN and other service providers. 3.1.15 session b-ITU-T Y.2091: A temporary telecommunications relationship among a group
39、of objects in the service stratum that is assigned to collectively fulfil a task for a period of time. A session has a state that may change during its lifetime. 3.1.16 third-party service provider ITU-T M.3050.1: The third-party service provider provides services to the enterprise for integration o
40、r bundling as an offer from the enterprise to the customer. Third-party service providers are part of an enterprises seamless offer. In contrast, a complementary service provider is visible in the offer to the enterprises customer, including having customer interaction. 3.1.17 topology ITU-T Y.2012:
41、 Information that indicates the structure of a network. It contains the network address and routing information. 3.1.18 user network interface (UNI) b-ITU-T G.8012: An interface that is used for the interconnection of customer equipment with a network element of the transport network. 3.2 Terms defi
42、ned in this Supplement This Supplement defines the following terms: 3.2.1 service overlay network (SON): A virtual or logical service network deployed to facilitate the creation and deployment of enhanced service-specific functions with applications. 3.2.2 session mobility: The capability that allow
43、s a user to transfer an ongoing communication session from one device to another device. Note that session mobility includes the process of transferring an active session to another terminal or another interface. Y series Supplement 17 (02/2012) 3 4 Abbreviations and acronyms This Supplement uses th
44、e following abbreviations and acronyms: AIPF Application Interface Provisioning Function AKA Authentication and Key Agreement ANI Application Network Interface API Application Programming Interface AV Authentication Vector CPN Customer Premises Network DHT Distributed Hash Table IaaS Infrastructure
45、as a Service ID Identification IdM Identity Management IPTV Internet Protocol Television NGN Next Generation Network P2P Peer-to-Peer PaaS Platform as a Service QoE Quality of Experience QoS Quality of Service SaaS Software as a Service SNI Service Node Interface SON Service Overlay Network UNI User
46、 Network Interface XaaS Everything as a Service 5 Conventions None. 6 Overview of service overlay networks (SONs) 6.1 Introduction to SON A service overlay network (SON) uses a logical service networking structure to support diverse application features. SONs can be thought of as being connected log
47、ically, regardless of the underlying networks. Additionally, SONs, which use the NGN, support composition functions that are used to provide customer-oriented service features and their associated applications. With the rapid advancement of computing technology, it is possible to aggregate informati
48、on and computing resources which are available from clients or peers and utilize these to provide services more effectively. Figure 6-1 shows the general model of a SON that uses the NGN. In this diagram, SON comprises SON functional elements. 4 Y series Supplement 17 (02/2012) User 4User 3User 7Y S
49、uppl.17(12)_F6-1User 1User 6User 5User 2Application layerService overlay network (SON)ANI or SNIApplicationSON functional 1entityHomenetworkCPNNGNAccessnetworkHomenetworkFigure 6-1 General model of a SON using the NGN 6.1.1 SON relationship with NGN SON aims to provide easy and quick deployment of service-specific logical networking functions, which can be used to complement the services that can be provided by transport networks. SON need not be constraine
