1、 International Telecommunication Union ITU-T H.622TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2008) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSBroadband, triple-play and advanced multimedia services Advanced multimedia services and applicationsA generic home network architecture with suppor
2、t for multimedia services Recommendation ITU-T H.622 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems asp
3、ects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architectu
4、re for audiovisual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobil
5、e multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559Mobile multimedia collaboration inter-working pr
6、ocedures H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV
7、middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.622 (06/2008) i Recomme
8、ndation ITU-T H.622 A generic home network architecture with support for multimedia services Summary Recommendation ITU-T H.622 describes the architectural framework of a home network that supports multimedia services. Definitions of home network elements such as access gateway, domains, terminals a
9、nd interfaces are introduced with explanations. This Recommendation also provides a comparison with related documents. Source Recommendation ITU-T H.622 was approved on 13 June 2008 by ITU-T Study Group 16 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Access gateway, domain, home ne
10、twork, terminal. ii Rec. ITU-T H.622 (06/2008) 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 perman
11、ent 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 worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establish
12、es 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 Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standar
13、ds are prepared 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 Recomm
14、endation 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
15、used to 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 Intel
16、lectual 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 receiv
17、ed notice 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/
18、. ITU 2009 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 H.622 (06/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Model of the ho
19、me network 4 6.1 Concept of layered model. 4 6.2 Transport model of the home network . 5 6.3 Application model of the home network 5 7 QoS . 13 7.1 Class-based QoS. 14 7.2 Session-based QoS . 15 7.3 QoS in primary and secondary domains. 15 8 Management Functionality . 16 8.1 IP address management 16
20、 9 Security. 18 Appendix I Components in home network documents. 19 I.1 Introduction 19 I.2 Access GW . 19 I.3 Terminal . 21 I.4 Other devices 21 I.5 Network domain . 22 I.6 Interfaces 23 Bibliography. 25 iv Rec. ITU-T H.622 (06/2008) Introduction The home network is recognized as an important eleme
21、nt of multimedia services. Considering the configuration of typical broadband services, the home network has two major roles; an extension of the access network and a transmission medium for data distribution among home devices. A fundamental difference can be found between these two roles. As an ex
22、tension of the access network, the home network should provide characteristics similar to those of the access network, quality of service (QoS) for example. The home network also inter-connects consumer electronic devices in the same home. For this purpose, this part of the home network may not need
23、 to work with the functional entities in the network or service provider. To clarify these two different roles of the home network, Recommendation ITU-T H.622 introduces the concept of primary and secondary domains. The primary domain is defined as that part of the home network that works as an exte
24、nsion of the access NW, while the secondary domain is defined as the rest of the home network. Primary and secondary terminals are introduced in the same way. Some key features of the home network such as QoS and management that are defined in other documents are described in this context. Since the
25、 home network includes various technical areas from physical data transmission to multimedia capability, it is difficult for any single document to cover all issues. This Recommendation and Recommendation ITU-T G.9970, which is an accompanying Recommendation, share the same layered model that consis
26、ts of transport and application models. This Recommendation mostly focuses on the issues related to the application model. For better understanding of the home network, users of this Recommendation are encouraged to consider Recommendation ITU-T G.9970. Rec. ITU-T H.622 (06/2008) 1 Recommendation IT
27、U-T H.622 A generic home network architecture with support for multimedia services 1 Scope This Recommendation describes a generic home network architecture that is applicable to, including but not limited to, fibre-to-the-home (FTTH), xDSL and cable television (CATV). The architecture is designed t
28、o support a wide range of multimedia services such as Internet Protocol television (IPTV), IP-telephony and video telephony as well as legacy services, if needed. The goal of the architecture is to define functionalities and interfaces that support these services with the demanded level of quality o
29、f service (QoS), security and management capability in the home network domain based on ITU-T J.190. The home network specific to each access network can be defined based on functional entities and interfaces defined in this Recommendation. This Recommendation uses the transmission functionality and
30、 demarcation point between the access network and the home network defined in b-ITU-T G.9970 that contains more details about these aspects. Users of this Recommendation are encouraged to consider both Recommendations for complete understanding of the generic home network architecture. 2 References
31、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 editions indicated were valid. All Recommendations and other references are subject to revision; users of t
32、his 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 valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation
33、does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.610 Recommendation ITU-T H.610 (2003), Full service VDSL System architecture and customer premises equipment. ITU-T J.190 Recommendation ITU-T J.190 (2002), Architecture of MediaHomeNet that supports cable-based ser
34、vices. ITU-T X.1111 Recommendation ITU-T X.1111 (2007), Framework of security technologies for home network. ATIS 0800002 ATIS 0800002 (2006), IPTV Architecture Requirements. DSL TR-094 DSL Forum TR-094 (2004), Multi-Service Delivery Framework for Home Networks. HGI HGI (2006), Home Gateway Technica
35、l Requirements: Release 1. 2 Rec. ITU-T H.622 (06/2008) 3 Definitions This Recommendation defines the following term: 3.1 home network: A home network is the collection of elements that process, manage, transport and store information, thus enabling the connection and integration of multiple computi
36、ng, control, monitoring, communication and entertainment devices in the home. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AGAF Access Gateway Application layer Function AGTF Access Gateway Transport layer Function AGW Access Gateway AN Access Netwo
37、rk ASG Application Service Gateway ASP Application Service Provider AV Audio Visual B-NT Broadband Network Termination CM Cable Modem CODEC COder-DECoder DHCP Dynamic Host Configuration Protocol DNG Delivery Network Gateway DNGF Delivery Network Gateway Function DRM Digital Rights Management DSCP Di
38、fferentiated Services Code Point EPG Electronic Programme Guide EUT End User Terminal FPD Functional Processing Device FPD/T Functional Processing Device and Terminal GW Gateway HA Home Access HB Home Bridge HC Home Client HD Home Decoder HE Head-End HN Home Network HNS Home Network Segment IGMP Int
39、ernet Group Management Protocol IP Internet Protocol IPCP Internet Protocol Control Protocol Rec. ITU-T H.622 (06/2008) 3 IPI Internet Protocol Infrastructure ISP Internet Service Provider ITF IPTV Terminal Function LC Layer-1/2 Converter MLD Multicast Listener Discovery NAT Network Address Translat
40、ion NID Network Interface Device NSIS Next Steps In Signalling NT Network Termination ONT Optical Network Termination PC Personal Computer PLC Power Line Communications PS Plain old telephone service Splitter QoS Quality of Service RG Residential Gateway RQoS Relative Quality of Service RSVP Resourc
41、e ReserVation Protocol SM Service Module STB Set-Top Box TCP Transmission Control Protocol ToS Type of Service TTL Time To Live TV Television set UPnP Universal Plug and Play VLAN Virtual Local Area Network VTP/D VDSL Termination Processing or VDSL Termination Processing and Decoding XSP Service Pro
42、vider xTU-R xDSL remote terminal unit 5 Conventions In this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be claimed. The keywords “is prohibited from“ indicate
43、 a requirement which must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be claimed. 4 Rec. ITU-T H.622 (06/2008) The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus, this requ
44、irement need not be present to claim conformance. The keywords “is not recommended“ indicate a requirement which is not recommended but which is not specifically prohibited. Thus, conformance with this Recommendation can still be claimed even if this requirement is present. The keywords “can optiona
45、lly“ indicate an optional requirement which is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means
46、 the vendor may optionally provide the feature and still claim conformance with the specification. 6 Model of the home network 6.1 Concept of layered model The home network is an integrated technology ranging from physical transmission to service support. It is difficult to encompass all the aspects
47、 of a home network in a single architectural model. This Recommendation adopts a layered model as shown in Figure 6-1. Figure 6-1 The conceptual diagram of layered model The layered function architecture includes two layers: transport function layer and application function layer. The detailed descr
48、iptions are presented as follows: a) The transport model describes how the network links clients together and transfers the data packets across the network. The transport model corresponds to three layers: network, data link and physical. That is to say, the functions of physical connection, data li
49、nk connection and choice of packet switching are realized in this model. b) The application model describes the features that allow users to interact with the networks, including defining data formats, designing services and designing interfaces. There are Rec. ITU-T H.622 (06/2008) 5 many services at present, such as TV gaming, TV education and linear TV. Providing more multimedia services may help drive the widespread adoption of multimedia capabilities, so it is necessary to design more types of services. The data formats of
