1、 International Telecommunication Union ITU-T Y.2291TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2011) 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、Architectural overview of next generation home networks Recommendation ITU-T Y.2291 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.2299Numb
6、ering, naming and addressing Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Smart ubiquitous networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 Future networks Y.3000Y.3099 F
7、or further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.2291 (01/2011) i Recommendation ITU-T Y.2291 Architectural overview of next generation home networks Summary Recommendation ITU-T Y.2291 provides an architectural overview of next generation home networks (NGHN). In
8、line with Recommendation ITU-T Y.2011 and Recommendation ITU-T Y.2012 principles, an implementation-independent approach is adopted. History Edition Recommendation Approval Study Group 1.0 ITU-T Y.2291 2011-01-28 13 Keywords Home network, next generation home network (NGHN), next generation network
9、(NGN). ii Rec. ITU-T Y.2291 (01/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ
10、 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 worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the to
11、pics 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 Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are pr
12、epared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the 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
13、may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) 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
14、 express requirements. The use of such words does not suggest that compliance with 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
15、 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 Recommendation development process. As of the date of approval of this Recommendation, ITU had not received noti
16、ce of intellectual property, protected by patents, which may be required to implement 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 2
17、011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y.2291 (01/2011) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recom
18、mendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Overview of next generation home network (NGHN) . 3 6.1 General characteristics of next generation home network (NGHN) 3 6.2 Connectivity to the NGHN . 3 7 Overview of the NGHN architecture 4 7.1 Overview of functional framework 4 7.2 NG
19、HN functions at transport stratum . 6 7.3 NGHN functions at service stratum . 7 7.4 NGHN management functions (H-MF) 7 7.5 NGHN identity management functions (H-IdM) . 8 7.6 Home network terminal functions (TF) 8 8 Security considerations . 8 Appendix I Federation of NGHNs 9 Bibliography. 10 Rec. IT
20、U-T Y.2291 (01/2011) 1 Recommendation ITU-T Y.2291 Architectural overview of next generation home networks 1 Scope The objective of this Recommendation is to provide the architectural overview of next generation home networks (NGHN) identifying overall features and functions of home network using an
21、 implementation independent approach using ITU-T Y.2011 and ITU-T Y.2012 principles. NGHN are intended to support NGN capabilities as per ITU-T Y.2201. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provision
22、s 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 edition of the Recommendations a
23、nd other references listed below. A list of the currently valid 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. ITU-T H.622 Recommendation ITU-T H.622 (2008), A generic h
24、ome network architecture with support for multimedia services. ITU-T X.1111 Recommendation ITU-T X.1111 (2007), Framework of security technologies for home network. ITU-T Y.2011 Recommendation ITU-T Y.2011 (2004), General principles and general reference model for Next Generation Networks. ITU-T Y.2
25、012 Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next generation networks. ITU-T Y.2111 Recommendation ITU-T Y.2111 (2008), Resource and admission control functions in next generation networks. ITU-T Y.2201 Recommendation ITU-T Y.2201 (2009), Requirements and capab
26、ilities for ITU-T NGN. ITU-T Y.2701 Recommendation ITU-T Y.2701 (2007), Security requirements for NGN release 1. ITU-T Y.2720 Recommendation ITU-T Y.2720 (2009), NGN identity management framework. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewher
27、e: 3.1.1 federation ITU-T Y.2720: Establishing a relationship between two or more entities or an association comprising any number of service providers and identity providers. 3.1.2 home network ITU-T H.622: A home network is the collection of elements that process, manage, transport and store infor
28、mation, thus enabling the connection and integration of multiple computing, control, monitoring, communication and entertainment devices in the home. NOTE In this Recommendation, entities are end users, terminals and services. 2 Rec. ITU-T Y.2291 (01/2011) 3.2 Terms defined in this Recommendation Th
29、is Recommendation defines the following terms: 3.2.1 home network application network interface: Interface between home network applications and the next generation home network (NGHN). 3.2.2 home network terminal network interface: Interface between terminal equipment and the next generation home n
30、etwork (NGHN). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ANI Application Network Interface ASF NGHN can be viewed as an IP-based home network; User access to a wide range of services and applications (including real time/non-real time and multime
31、dia services); Seamless environment for acquiring, sharing, storing and accessing digital media and content within the home network; Use of multiple broadband (wired and/or wireless), QoS-enabled transport technologies; Support of fixed and mobile terminals, including support of legacy terminals (e.
32、g., PSTN/ISDN terminals); Automatic discovery and management of terminals attached to the home network. Thus, features in NGHN architecture are to enhance home network capabilities described in ITU-T H.622. 6.2 Connectivity to the NGHN Figure 6-1 shows the different connectivity provided by a next g
33、eneration home network (NGHN). 4 Rec. ITU-T Y.2291 (01/2011) Y.2291(11)_F6-1Non-IPgatewayIP TerminalNon-IP TerminalUNIH-TNINext generation home networkHome networkapplicationsH-ANIControl MediaH-TNINGNNon-NGNIP-basednetworkPSTN/ISDNIntra-home connectivity Connectivity to other networksIP TerminalNon
34、-IP TerminalNon-IP TerminalFigure 6-1 Connectivity to NGHN NGHN provides two types of connectivity: Intra-home connectivity covers the connectivity of terminals within the home network. This includes connectivity of IP terminals at the home network terminal network interface (H-TNI) and connectivity
35、 of non-IP terminals via a non-IP gateway at the H-TNI; Connectivity to other networks covers the connectivity of NGHN at the UNI to other external networks such as NGN, non-NGN IP-based networks or PSTN/ISDN. Considering these two types of connectivity, there are two major roles for the home networ
36、k, i.e., extending the other networks (such as NGN) and their access network as well as interconnecting terminals in the NGHN itself. The portion working as an extension of the access networks must be aligned with the technical requirements of the network provider. Requirements regarding connection
37、and access to the NGN are captured in particular in clauses 17.1 and 17.2 of ITU-T Y.2201. 7 Overview of the NGHN architecture 7.1 Overview of functional framework Figure 7-1 shows an overview of the NGHN architecture. The NGHN architecture follows a similar decomposition as the one defined for the
38、NGN architecture as defined in ITU-T Y.2012. The NGHN functional architecture supports the UNI, H-TNI and H-ANI reference points shown in Figure 6-1. The NGHN functions are divided into service stratum functions and transport stratum functions according to the principles described for NGN in ITU-T Y
39、.2011. The NGHN service stratum 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. Rec. ITU-T Y.2291 (01/2011) 5 The NGHN transport stratum provides the user functio
40、ns that transfer data and the functions that control and manage transport resources to carry such data between terminating entities. The delivery of services/applications to the end user is provided by utilizing the application support functions and service support functions and related control func
41、tions. The transport stratum provides IP connectivity services to NGHN users under the control of transport control functions within the NGHN, including the network attachment control functions (H-NACF), resource and admission control functions (H-RACF) and mobility management and control functions
42、(H-MMCF). Y.2291(11)_F7-1NGHN transport stratumNGHN service stratumControlMedia IdMUNIH-TNIManagementNGHN application support functions and servicesupport functions (H-ASF and SSF)HGHN service control and content delivery functions Transport userprofiles H-NACFNGHN transport control functions (H-TCF
43、) NGHN transport functions (H-TrF)H-ANIHomenetworkterminalfunctions(TF)NGHNIdMfunctions (H-IdM)NGHNmanagementfunctions(H-MF)FunctionsfromNGNandothernetworksHome network applicationsService userprofiles H-SCF H-CDFH-MMCF H-RACFNOTE 1 The user network interface (UNI), NGHN application network interfac
44、e (H-ANI) and home network terminal network interface (H-TNI) are to be understood as general NGHN reference points that can be mapped to specific physical interfaces depending on the particular physical implementations. NOTE 2 Boxes in Figure 7-1 identify high level functional groups, for which ove
45、rall descriptions are given later in this clause. NOTE 3 The control links between the functional groups represent high-level logical interactions. NOTE 4 User profiles in both the service stratum and the transport stratum are shown as separate functional databases. Depending on the implementation i
46、n place, these two functional databases can optionally be co-located. NOTE 5 The NGN-UNI line shows the functional aspect only and should not make any pre-decision about an ownership domain. NOTE 6 It is possible for NGHN identity management functions (H-IdM) to reside in different planes (e.g., use
47、r, control and management) and different strata of the distributed architecture (e.g., service stratum and transport stratum). Although IdM functions are shown in a standalone group of functions, this is not intended to impose any implementation design and restrictions for IdM. NOTE 7 Although IdM f
48、unctions are shown on the left side of Figure 7-1, this does not mean that IdM functions are located on the H-TNI side or part of the terminal functions. NOTE 8 Although not shown in Figure 7-1, IdM functions can be connected to functions from other networks using the UNI reference point. Figure 7-1
49、 NGHN architectural overview 6 Rec. ITU-T Y.2291 (01/2011) 7.2 NGHN functions at transport stratum The transport stratum functions include transport functions and transport control functions in ITU-T Y.2011. 7.2.1 NGHN transport functions (H-TrF) The H-TrF provide the connectivity for all components and physically separated functions within the NGHN. These functions provide the support for unicast and/or multicast transfer of media information, as well as the transfer of
