1、 International Telecommunication Union ITU-T J.190TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2007) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Cable modems Architecture of MediaHomeNet ITU-T Recommendation J.190 ITU-T Rec. J.190 (07/
2、2007) i ITU-T Recommendation J.190 Architecture of MediaHomeNet Summary ITU-T Recommendation J.190 establishes a flexible and forward-looking home-networking framework that provides a unifying theme for developing a coherent set of home-network interface specifications. The MediaHomeNet infrastructu
3、re, initially created for cable access networks, is now designed to be complementary to all IP-based access networks in order to support applications such as video distribution to STB defined in ITU-T Recommendation J.290 (next generation set-top box) and voice over IP defined in ITU-T Recommendatio
4、n J.160 (IPCablecom) or ITU-T Recommendation J.360 (IPCablecom2), and RF-based broadcast services. MediaHomeNet identifies a set of fundamental architectural elements that can be flexibly combined in a set of configurations, allowing for the consideration of a wide variety of home-networking solutio
5、ns. Source ITU-T Recommendation J.190 was approved on 29 July 2007 by ITU-T Study Group 9 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. J.190 (07/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecomm
6、unications, information 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 telecommun
7、ications 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 by the proced
8、ure 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 both a teleco
9、mmunication 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 all of thes
10、e 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 RIGHTS ITU
11、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 ITU member
12、s 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, implementers are cautioned that this may not
13、represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2008 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. J.190 (0
14、7/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 1 4 Abbreviations and acronyms 2 5 Reference architecture 4 5.1 Introduction and motivation . 4 5.2 Requirements and terms of reference . 4 5.3 MediaHomeNet architecture context 6 5.4 MediaHomeNet logical reference archite
15、cture. 7 5.5 IPNet2Home functional reference model. 16 5.6 MediaHomeNet messaging interface model 22 5.7 IPNet2Home information reference model 23 Appendix I Home-networking requirements for cable-based services. 27 I.1 Scope 27 I.2 Informative references 27 I.3 Terms and definitions. 27 I.4 Abbrevi
16、ations . 27 I.5 Introduction 27 I.6 Background: Cable data services 30 I.7 Service support requirements . 36 Bibliography. 46 ITU-T Rec. J.190 (07/2007) 1 ITU-T Recommendation J.190 Architecture of MediaHomeNet 1 Scope This Recommendation establishes a flexible and forward-looking home-networking fr
17、amework that provides a unifying theme for developing a coherent set of home-network interface specifications, while at the same time lending itself to future enhancement. The MediaHomeNet infrastructure, initially created for cable access networks, is now designed to be complementary to those of al
18、l IP-based access network applications such as video distribution to STB defined in b-ITU-T J.290 (next generation set-top box) and voice over IP defined in b-ITU-T J.160 (IPCablecom) or b-ITU-T J.360 (IPCablecom2), and RF-based broadcast networks, but distinct and operational in the absence of depl
19、oyment of these applications. This Recommendation identifies a set of fundamental architectural elements that can be flexibly combined in a set of configurations, allowing for the consideration of a wide variety of home-networking solutions. 2 References None. 3 Terms and definitions This Recommenda
20、tion defines the following terms: 3.1 access node: As used in this Recommendation, an access node is a termination device that terminates the network end of an access network connection. The access node is technology specific; for example, in Annex A of J.112 it is called the INA while in Annexes B
21、and C it is the CMTS. 3.2 domains: The extent of home-network-compliant direct influence. 3.3 home access (HA): A device class that connects access network with home bridge. 3.4 home bridge (HB): A device class that connects home access with home client. 3.5 home client (HC): A device class that con
22、nects home bridge with home decoder. 3.6 home decoder (HD): A device class that terminates home network. 3.7 home network planes: User interfaces sharing the same Layer 1/Layer 2 or internal link. 3.8 IPNet2Home: The domain in MediaHomeNet that is well bounded and specified based on Internet protoco
23、l layer 3 interoperability, as opposed to other domains that can be independently, arbitrarily, or privately designed to an individual manufacturers specification. 3.9 function: Capabilities that compromise logical elements. 3.10 LAN IP device: A component using the Internet protocols on a local are
24、a network. 3.11 logical element: A collection of one or more functions. 3.12 MediaHomeNet: An ITU-T project that includes an architecture and a series of Recommendations that support the delivery of services over home networks. A network that connects multiple elements in a home environment to allow
25、 delivery of multi-purpose, multimedia services. 3.13 multimedia terminal adapter (MTA): Defined by IPCablecom as an element that provides IP packetized multimedia services. 2 ITU-T Rec. J.190 (07/2007) 3.14 residential gateway: A logical element that provides in-premise and aggregated security, man
26、agement, provisioning, and addressing services for logical elements within a compliant IPNet2Home network. In this Recommendation, it is also referred to as portal services (PS). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations: AN Access Node AV Audio-Visual BP Boun
27、dary Point BWMF Bandwidth Management Function CAP IPNet2Home Address Portal CAT IPNet2Home Address Translation CDP IPNet2Home DHCP Portal CMP IPNet2Home Management Portal CMTS Cable Modem Termination System CNP IPNet2Home Naming Portal CPT IPNet2Home Address Passthrough CQoS IPNet2Home Quality of Se
28、rvice CQP IPNet2Home QoS Portal CSP IPNet2Home Security Portal CTP IPNet2Home Testing Portal DHCP Dynamic Host Configuration Protocol b-IETF RFC 2131 DNS Domain Name System b-IETF RFC 1034 DQoS Dynamic Quality of Service DRM Digital Rights Management DVD Digital Versatile Disk EP Endpoint FAX Facsim
29、ile (ITU-T Rec. T.30) FW Firewall HA Home Access HB Home Bridge HC Home Client HD Home Decoder HE Headend HFC Hybrid Fibre/Coax HTTP HyperText Transport Protocol ICMP Internet Control Message Protocol b-IETF RFC 792 IP Internet Protocol ITU-T Rec. J.190 (07/2007) 3 KDC Key Distribution Centre (see T
30、able 5-4) LAN Local Area Network LAN-Pass LAN Passthrough Address Realm LAN-Trans LAN Translated Address Realm LC Layer-1/2 Converter MCF Management Client Function MPAC Media Access Control layer MPEG Moving Picture Experts Group MPF Management Portal Function MSF Management Server Function MTA Mul
31、timedia Terminal Adapter NAT Network Address Translation b-IETF RFC 1631, b-IETF RFC 2663 and b-IETF RFC 3022 NMS Network Management System ONT Optical Network Termination PC Personal Computer PHY Physical layer Prop Trans Proprietary Translated Address Realm PS Portal Services QCF QoS Client Functi
32、on QoS Quality of Service QPF QoS Portal Function QSF QoS Server Function RSVP Resource ReSerVation Protocol b-IETF RFC 2210 SBM Subnet Bandwidth Manager SCF Security Client Function SNMP Simple Network Management Protocol b-IETF RFC 1157 SPF Security Portal Function SSF Security Server Function STB
33、 Set-Top Box SYSLOG System Logging TCP Transmission Control Protocol TEL Telephone TFTP Trivial File Transfer Protocol b-IETF RFC 1350 UDP User Datagram Protocol UPnP Universal Plug and Play USB Universal Serial Bus 4 ITU-T Rec. J.190 (07/2007) USFS Upstream Selective Forwarding Switch VPN Virtual P
34、rivate Network WAN Wide Area Network WAN-Data WAN Data Address Realm WAN-Man WAN Management Address Realm 5 Reference architecture 5.1 Introduction and motivation In order to extend the advantages of multimedia services to all devices connected to a home network, the MediaHomeNet architecture provid
35、es a framework for home networking. The goal of MediaHomeNet, initially created for cable access networks and now designed to be complimentary to all IP-based access technologies, is to provide new IP-based services as well as RF-based ones to devices within the home, complementing access network, a
36、pplications, such as video distribution services using next generation video set-top box (e.g., b-ITU-T J.290) and IPCablecom (e.g., b-ITU-T J.160), and broadcast network infrastructures. Specifically, MediaHomeNet provides an infrastructure, by specifying a home networking environment, over which I
37、PCablecom and other related application services can be delivered, managed and supported. Wherever possible, the architecture framework incorporates ITU-T Recommendations and other existing standards. The MediaHomeNet architecture is composed of two sub-architectures: IPNet2Home architecture and Pro
38、prietary architecture. The IPNet2Home architecture uses an IP-based access network for providing network capabilities. The Proprietary architecture uses the broadcast services on the RF-based network such as HFC or Radio on Fibre (e.g., ITU-T Recs J.185 and J.186). The MediaHomeNet architecture supp
39、orts a myriad of operator and service provider business models, and introduces additional features above and beyond existing home networking solutions. One of the goals of the MediaHomeNet architecture is the creation of an operator and service provider configurable gateway centric environment for r
40、esidential use that will interoperate with existing IP-based home devices (LAN IP devices) and new IPNet2Home devices. The MediaHomeNet architecture must allow for remote detection, access or control of services and applications on the home network from either in-home or out-of-home. It is a goal of
41、 IPNet2Home to remain independent of physical and data link protocols. Home networking technologies such as b-ITU-T G.9951 are given as examples. IPNet2Home is focused on Layer 3 IP traffic in the home. Similarly, IPNet2Home does not place requirements on higher layers for specific application or co
42、decs. The architecture targets supporting resource intensive services such as MPEG video streaming, toll quality IP telephony and gaming. 5.2 Requirements and terms of reference MediaHomeNet brings operator driven management, provisioning, QoS, and security to the home. IPNet2Home brings operator dr
43、iven management, provisioning, QoS, and security to the residential gateway and IP devices. In addition, visibility and remote diagnostics for home IP devices is enabled. A summary of the capabilities provided by the MediaHomeNet follows: Management and provisioning Remote management and configurati
44、on of the residential gateway device; Simple residential gateway management proxy for IP-based home devices; Hands-off provisioning for residential gateway devices; Allow for conversions between IP protocol and proprietary protocol; ITU-T Rec. J.190 (07/2007) 5 Allow for retrieval of services provid
45、ed by home devices; Detection of connection and disconnection to home devices. Addressing and packet handling One-to-many address translation for home devices; One-to-one address translation for home devices; Non-translated addressing for home devices (for NAT phobic applications); Access network tr
46、affic protection from in-home device intra-communications; Home-addressing support during access network outage; Simple DNS server in the residential gateway; Allow for the management of addressing and packet handling of the proprietary home devices (address conversion, address assignment, address n
47、otification and address retrieval). Quality of Service (QoS) Residential gateway device bridging functionality for network side QoS messaging from/to application side. Security Residential gateway device authentication; Secure residential gateway management messages; Secure download of configuration
48、 and software files; Secure QoS on the access network; Remote residential gateway firewall management. Video services Video services are a core business for some operators and thus the distribution of video content over MediaHomeNet networks merits special consideration. The distribution of quality
49、entertainment video entails the same categories of features as those for general IP networking, but in the case of video, these features often must meet more stringent additional requirements. For example, specific QoS and content protection requirements must be satisfied for the distribution of premium entertainment content. Video distribution requirements are detailed in this clause, and these requirements may be satisfied by a network that is physically separate from the IPNet2Home data network, or by a network tha
