1、 International Telecommunication Union ITU-T J.294TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (09/2010) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Cable modems Residential gateway requirements for the support of broadcast and IP-based in
2、teractive services over cable television networks Recommendation ITU-T J.294 Rec. ITU-T J.294 (09/2010) i Recommendation ITU-T J.294 Residential gateway requirements for the support of broadcast and IP-based interactive services over cable television networks Summary Recommendation ITU-T J.294 descr
3、ibes objectives, requirements and functional architecture for a residential gateway (RG) supporting broadcast and IP-based interactive services over cable television networks. This Recommendation describes the requirements for the functional components which form logical entities of RG. History Edit
4、ion Recommendation Approval Study Group 1.0 ITU-T J.294 2010-09-13 9 ii Rec. ITU-T J.294 (09/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecomm
5、unication 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 worldwide basis. The World Telecommunication Standardization Asse
6、mbly (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 Resolution 1. In some areas of information technology whi
7、ch 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 both a telecommunication administration and a recognized operating agency. Compliance with t
8、his 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 all of these mandatory provisions are met. The words “shall“ or some other obligatory lan
9、guage 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 RIGHTS ITU draws attention to the possibility that the practice or implementation of this
10、 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 ITU members or others outside of the Recommendation development process. As of the date
11、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, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult t
12、he TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2011 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 J.294 (09/2010) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms
13、defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 Conventions 5 6 General 5 7 Design objectives 9 7.1 Design objectives for enhanced broadcast services 9 7.2 Design objectives for optional advanced features 10 7.3 Implementation . 10 7.4 Services . 10
14、8 Requirements for functional components . 11 8.1 Applications functionality 12 8.2 Service control functionality 17 8.3 Content delivery functionality 20 8.4 Network control functionality 21 8.5 Network interface functionality 25 9 Requirements for optional standardized features . 26 9.1 Requiremen
15、ts to incorporate a full DOCSIS CM into the RG . 26 Appendix I Relationship between APIs and bundle application programs 27 Appendix II Access network configuration aspect . 28 Appendix III Application and service aspect 29 Bibliography. 31 Rec. ITU-T J.294 (09/2010) 1 Recommendation ITU-T J.294 Res
16、idential gateway requirements for the support of broadcast and IP-based interactive services over cable television networks 1 Scope This Recommendation describes objectives, requirements and functional architecture for a residential gateway (RG) supporting broadcast and IP-based interactive services
17、 over cable television networks. The RG is supposed to be used with a hybrid set-top box (H-STB) composed of RF TV reception capability and IPTV terminal device (IPTV-TD) functions as well as other devices within a home network environment ITU-T J.190. The RG device provides a bridging and/or termin
18、ating capability between a cable access network (i.e., WAN) and a home network (i.e., LAN) in every layer. The RG has functionalities for network interface, network control, content delivery, service control and applications to exchange control signal and media flow between WAN and LAN. Each functio
19、nality has several functional components. This Recommendation describes the requirements for the functional components which form logical entities of RG. The RG is assumed to be a home gateway for the reception of enhanced broadcast services over cable television networks defined by ITU-T J.700, con
20、sisting of quality of service (QoS), priority mechanisms, management and provisioning functions. 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, t
21、he 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 and other references listed below. A list of the current
22、ly 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 J.190 Recommendation ITU-T J.190 (2007), Architecture of MediaHomeNet. ITU-T J.218 Recommendation ITU-T J.2
23、18 (2007), Cable modem IPv4 and IPv6 eRouter specification. ITU-T J.293 Recommendation ITU-T J.293 (2008), Component definition and interface specification for the next generation set-top box. ITU-T J.700 Recommendation ITU-T J.700 (2009), IPTV service requirements and framework for secondary distri
24、bution. ITU-T J.701 Recommendation ITU-T J.701 (2008), Broadcast-centric IPTV terminal middleware. ITU-T J.702 Recommendation ITU-T J.702 (2008), Enablement of current terminal devices for the support of IPTV services. ITU-T X.1191 Recommendation ITU-T X.1191 (2009), Functional requirements and arch
25、itecture for IPTV security aspects. ITU-T Y.1901 Recommendation ITU-T Y.1901 (2009), Requirements for the support of IPTV services. ITU-T Y.1910 Recommendation ITU-T Y.1910 (2008), IPTV functional architecture. 2 Rec. ITU-T J.294 (09/2010) 3 Definitions 3.1 Terms defined elsewhere This Recommendatio
26、n uses the following terms defined elsewhere: 3.1.1 cable modem b-ITU-T J.112: A modulator-demodulator at subscriber locations intended for use in conveying data communications on a cable television system. 3.1.2 cable modem termination system b-ITU-T J.112: Located at the cable television system he
27、adend or distribution hub, which provides complementary functionality to the cable modems to enable data connectivity to a wide-area network. 3.1.3 closed captioning b-ITU-T J.193: Text scrolling on a television display that represents the audio portion of the program, typically provided for the hea
28、ring impaired. 3.1.4 conditional access b-ITU-T J.193: The conditional granting of access to cable services and content based upon what service suite has been purchased by the customer. 3.1.5 IP-based services b-ITU-T J.193: A generic term that includes QoS-controllable both-way and one-way IP-type
29、services rendered over a CATV network on which a high-speed packet-based IP communication system is available. Examples include IP telephony or VoIP, videoconferencing, streaming video feeds, competitive games, and other similar services. 3.2 Terms defined in this Recommendation This Recommendation
30、defines the following terms: 3.2.1 access network interface: The logical interface between the wide area network (WAN) (i.e., access network) and the residential gateway (RG). 3.2.2 digital rights management: The definition, management, and enforcement of a set of content usage rules. These usage ru
31、les will indicate things such as the right to copy, view, or distribute a particular piece of content. 3.2.3 domain: The extent of home-network-compliant direct influence. 3.2.4 emergency alert system (EAS): A system, within which the H-STB participates, that allows a service provider to distribute
32、public emergency alarms and information about the public emergency to all of the customers attached to the cable network. 3.2.5 home network interface: The logical interface between the RG and the local area network (LAN) (i.e., home network). 3.2.6 hybrid set-top-box (H-STB): A compilation of hardw
33、are and software functional entities contained within one or more physical devices, that, at a baseline level, provides the receiving functions for cable broadcast services. In addition, the hybrid set-top-box should support the interactive functions of IP-based services, additional time critical se
34、rvices between the access and the home network as well as extension and supplemental services. 3.2.7 local application service delivery platform (LASDP): An application and service execution environment that resides within the home network for the purpose of delivering advanced applications and serv
35、ices developed by either a service provider or by a third party to the cable service subscribers. 3.2.8 MediaHomeNet: A network that connects multiple elements in a home environment to allow delivery of multi-purpose, multimedia services. 3.2.9 middleware: Software within the H-STB which provides a
36、set of APIs that against which applications can be developed, and that provide access to the resources and services of the H-STB. Rec. ITU-T J.294 (09/2010) 3 3.2.10 residential gateway: A grouping of logical elements used to achieve access for home network(s). 3.2.11 services: The set of services t
37、hat are required and to be supported by the RG. 3.2.12 service provider interface (SPI): A service provider interface residing in the network side for the purpose of delivering advanced applications and services to the user. Applications and services can be developed either by the service provider o
38、r by a third party developer. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AOD Approved Output Domain API Application Program Interface ASD Authorized Service Domain BED Best Effort Domain CA Conditional Access CAS Conditional Access System CM Cable
39、 Modem CMTS Cable Modem Termination System CPE Customer Premises Equipment DLNA Digital Living Network Alliance DOCSIS Data over Cable System Interface Specification DPI Digital Program Insertion DRM Digital Rights Management DSG DOCSIS Set Top Gateway DTCP Digital Transmission Content Protection EA
40、S Emergency Alert System ECG Electronic Content Guide EPG Electronic Program Guide ESG Electronic Service Guide FW FireWall GEM Globally Executable Multimedia home Platform GSD Guaranteed Service Domain HFC Hybrid-Fibre/Coax HN Home Network HPNA Home Phoneline Networking Alliance HSP Home Security P
41、ortal H-STB Hybrid Set-Top-Box HTML HyperText Mark-up Language IGMP Internet Group Management Protocol 4 Rec. ITU-T J.294 (09/2010) IP Internet Protocol IPDV IP Packet Delay Variation IPER IP Packet Error Ratio IPG Interactive Program Guide IPLR IP Packet Loss Ratio IPTD IP Packet Transfer Delay LAN
42、 Local Area Network LASDP Local Application Service Delivery Platform MLD Multicast Listener Discovery MOCA Multimedia Over Coax Alliance MPEG Moving Picture Experts Group MW Middleware NAPT Network Address Port Translation NAT Network Address Translation OCAP Open Cable Application Platform ONU Opt
43、ical Network Unit OSGi Open Services Gateway Initiative OSS Operation Support System PLC Power Line Communication QoS Quality of Service RF Radio Frequency RFC Request For Comments RFoG RF over Glass RG Residential Gateway RTP Real-time Transport Protocol RTSP Real-time Streaming Protocol SPI Servic
44、e Provider Interface STB Set-Top-Box SVG Scalable Vector Graphics TS Transport Stream UI User Interface UPnP Universal Plug and Play V-ONU Video distribution Optical Network Unit VM Virtual Machine VOD Video On Demand VoIP Voice over IP WAN Wide Area Network Rec. ITU-T J.294 (09/2010) 5 5 Convention
45、s 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 recommended“ indicate a requirement which is recommended but which is not a
46、bsolutely required. Thus, this requirement need not be present to claim conformance. The keywords “is prohibited from“ 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 “can optionally“
47、 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 the
48、 vendor may optionally provide the feature and still claim conformance with the specification. In the body of this Recommendation and its annexes, the words shall, shall not, should, and may sometimes appear, in which case they are to be interpreted, respectively, as is required to, is prohibited fr
49、om, is recommended, and can optionally. The appearance of such phrases or keywords in an appendix or in material explicitly marked as informative are to be interpreted as having no normative intent. 6 General The rapid development of IP technologies enables the RG, with an integrated DOCSIS CM, to provide gateway functions for IP-based services, provide connectivity with the managed IP network, diverse VoIP, real-time services for IP broadcast, VOD and competitive games over IP transport. While DOCSIS CM offers a variety of IP-based se
