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Document 6 Document 6 Document Transcript

  • INTERNATIONAL TELECOMMUNICATION UNION Document 6 – E TELECOMMUNICATION STANDARDIZATION SECTOR TSB DIRECTOR’S CONSULTATION MEETING ON IPTV STANDARDIZATION Geneva, 4-5 April 2006 DOCUMENT 6 Source: NTT, KDDI, Hitachi, Matsushita Electric Industrial, Mitsubishi Electric, Sharp, Sony Title: The IPTV concept model discussed in Japan The IPTV concept model discussed in Japan Summary This draft describes the basic requirements and the concept model of the IPTV services currently discussed in Japan. Major telecommunications companies and consumer electronics vendors that are interested in IPTV have been working together to define the service requirements and technologies. Introduction Content delivery services on IP network, such as broadcasting over IP and video on demand, are currently getting into the market. At this stage, there are no established standards in the market. In many cases, because of the lack of standardized technologies, unnecessary investments are required or new services are made impossible. It is also feared that because this situation some businesses may be forced to use some proprietary solutions, leading to excessive costs or overly restrictive services. There seem to be some cases in which businesses are hindered because of legal and economic issues, caused by strategies and technologies which disregard the historical, cultural and social differences that have traditionally existed between content distribution businesses and IP network services. This state of affairs would not only unnecessarily restricts the scope of the content delivery services, as one of the most important services on IP network and hinders the sound development Contact: Jay Kishigami Naohiko Amemiya NTT KDDI Corporation Japan Japan Tel:+81-3-5205-5845 Tel: +81-3-6678-4101 Fax:+81-3-5205-5853 Fax:+81-3-6678-0273 Email:j.kishigami@hco.ntt.co.jp Email:namemiya@kddi.com Attention: This is not a publication made available to the public, but an internal ITU-T Document intended only for use by the Member States of ITU, by ITU-T Sector Members and Associates, and their respective staff and collaborators in their ITU related work. It shall not be made available to, and used by, any other persons or entities without the prior written consent of ITU-T.
  • -2- of the market and businesses, but also eventually prevents the consumer from enjoying the utility, services, and rights they are rightfully entitled to. Interoperable standards that would help provide and enjoy end-to-end services from the content holders to consumers and would give fair opportunities to each player in the value chain and with due respect to the differences in regions, countries, as well as those in service types and business models, would greatly contribute to the improvement of, and the normalization of the imbalances in, the life and culture of humanity, with the effective use of content delivery technologies over IP network. 1. IPTV Services In Japan, major telecommunications companies and consumer electronics vendors that are interested in IPTV have been working together to define the service requirements and technologies to be used for IPTV. The following are the types of reference services that are considered for IPTV: 1. Content Delivery Service i) IP Broadcasting Service: Scheduled Programs delivered by IP-multicast streaming ii) Video-on-Demand Service: On-demand videos delivered by unicast streaming iii) Near Video On Demand Service: Programs delivered by IP-multicast in a carrousel manner. iv) Download Service: Content streamed or downloaded to a storage device on the terminal for later consumption. 2. Content Navigation Service i) Portal Service: in which a service provider provides a web-based portal service wherein the user can - receive promotion information, get a basic subscription, renew and update services; - search, select, and acquire audio-visual and other multimedia content ii) Metadata Service and Advanced Electronic Content Guide: Metadata for schedule programs and on-demand content, as well as for those downloaded and carousselled, are used to provide rich and advanced navigation capabilities as electronic content guides (ECG) and electronic program guides (EPG) 2. Technologies to be standardized regarding IPTV In order to realize afore mentioned services, we are currently defining the specifications in the following technology areas: •Receiver Terminal Functionalities •Multimedia Encoding •Service Information •Metadata •Access Control and Receiver Specification •Communications Channel •Encoding and Transmission •Content Protection
  • -3- The following diagram shows the reference model for a receiver device. In view of the rapid development of IPTV services, ITU is advised to consider and recommend the approaches and requirements relevant to IPTV services and the requirements relevant to interactive multimedia services carried on telecommunications broadcast systems. More specifically, the following key technology areas related to IPTV need to be addressed within ITU:
  • -4- 2.1. Network Protocols, Transport Not only the protocols that are necessary for IPTV services but also those that are relevant to more conventional, e.g., web-based services, to be used in conjunction with broadcasting, need to be discussed and reviewed so that the terminal receivers will be able to act as integrated web terminal. Those protocols will likely include IETF RFC’s and other web-oriented specifications. Encoding and multiplexing are other issues that need to be addressed. 2.2. Content delivery mechanism Content delivery over IP can be realized using various methods, more than in the conventional broadcasting. Technologies and standards in the conventional services should be reviewed and recommendations be made. For multicasting it is envisaged that technologies like IGMP/MLD, which have been specified by IETF, will be used, but the details have to be reviewed rigorously. The video-on-demand is also to be specified. The pseudo-on-demand based on downloading The issues to be discussed include content control issues such as multicasting and trick play as well as quality issues like Forward Error Correction (FEC) and Quality of Service (QoS). In this respect, the consultations of Y.1540 and Y.1541 will also be relevant. The issues under this heading are closely related to network and transport protocols. 2.3. Content Formats It is necessary to recommend standardized formats and encoding methods of content. In the current broadcasting, MPEG-2 is generally used, but it is expected that other formats, such as H.264, will be useable in IPTV environment. For maximum interoperability, careful review of the relevant technologies is necessary. 2.5. Terminal Functionality The terminal receivers for IPTV must take into account the possibility of connecting with other devices, within and without the home network environment. Access to webcasting and the use of the receiver as an interactive web terminal offer important service scenarios. Standards and specifications regarding this area should be recommended. 2.6. Interactive Multimedia and Data Applications Many technologies are used on IP networks for the purpose of specifying, presenting, and executing interactive multimedia and data applications. In the broadcast and broadcast-like platforms, as identified in Recommendation ITU-R BT.1369, there are several different standards, which are in general distinct not only from each other, but from those widely used in the IP world. The interoperability between these is of utmost importance, because the cost of content creation and business models would be greatly affected. Especially in the IP world, where several de facto technologies coexist but a real interoperability is yet to be achieved, the interoperable interactive middleware would be truly welcome not only for the user but also for service operators. 2.7. Metadata and Service Discovery For the purposes of searching, finding, and acquiring programs, as well as for advertising and promoting content, the IPTV service must support metadata in general and digital program guides, in particular. This involves specifications for IPTV service discovery and identification of content and locations, and others. The metadata specifications such as TV-Anytime, DVB, and others,
  • -5- including service information in digital broadcasting for simple electronic program guide will be considered. 2.8. Rights Protection and Security Security and rights related issues are important aspect of any content delivery service. IPTV service in particular needs to have robust security mechanisms to protect the rights of content holders as well as providing optimal functionalities to the user. IPTV services need to accommodate, and seek to interoperate with, the currently existing conditional access systems so that broadcast content is easily integrated into the IP world, and also the robustness of the security policy in broadcasting can be enforced in IPTV. Authentication, content protection, and rights management information are some of the issues to be reviewed. The current web security mechanisms like SSL are also to be reviewed. 3. Proposed Directions of Standardization Processes 3.1. Current status of IPTV-related SGs The following table summarizes the current status of the ITU-T SGs relevant to IPTV. Table 1. Drafts relevant to IPTV within ITU-T Rec. (draft) Synopsis J.241 Recommendation on the quality of IP broadcasting; describes transport quality of IP-level and video quality on set top boxes. J.281 Requirements for IP broadcasting using FTTH J.mcvif-arch Draft recommendation on system architecture of IP broadcasting J.stb-mi-a Draft recommendation on the architecture of STB for IP broadcasting Y.1541 Draft Recommendation on the classification of IP-network quality. Appendix IX mentions the quality of IP-broadcasting. F.741 Recommendation on the service scenarios of audio/video on-demand services. Some mentions of N-VOD and IPTV. F.750 Metadata Framework Recommendation Though some of the SGs within ITU have liaison relations with others, activities encompassing several projects are desired and it is important to create a ITU-T general set of recommendations. 3.2 Standardization activities outside ITU There are several organizations working on the IP-related broadcasting standards. Most notable of these are: DVB (Digital Video Broadcasting ), ETSI(European Telecommunications Standards Institute), TV-Anytime Forum, ATSC (Advanced Television Standards Committee), ARIB (Association of Radio Industries and Businesses). In our recommendation on the IPTV services and technologies, it is important that their standards be taken into serious consideration, and the liaisons with them will be essential.
  • -6- 3.3 Framework for standardization The discussion on the standardization of IPTV should involve all the major players in the value- chain of the services on IP content delivery. It is also desirable that appropriate liaisons should be made between existing standardization bodies which are also working on similar aspects as well as those working on more conventional areas of broadcasting and content delivery. ___________