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IEEE Tutorial on IPTV IPTV End-User System


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IEEE Tutorial on IPTV IPTV End-User System

  1. 1. IEEE Tutorial on IPTV IPTV End-User System Shuji Hirakawa Toshiba Corporation IEEE Transactions on Broadcasting / Associate Editor Proceedings of the IEEE, Editorial Board Member IEC Technical Committee 100 (TC 100) Secretary ITU-R Working Party 6M (WP 6M) Vice Chairman
  2. 2. Contents Dr. Sheau’s question and his answers Telco IPTV service types The number of FTTH service subscribers in Japan Existing FTTH services International Standardizations IEC TC 100 and its Technical Area 9 for end-user networking ITU-T FG on IPTV Working Group 5 for end system MPEG2-TS or MPEG-PS Telco IPTV service using MPEG2-TS and MPEG-PS Requirement for IPTV end-user devices End-user device block diagram and protocol stack Other requirements for IPTV end-user devices End-user network and IPTV services 2
  3. 3. What is IPTV? Dr. Sheau Ng (Vice President, NBC Universal) raised the question what IPTV is. He gave us the following answers in his paper: Internet Video (Type 1) Telco IPTV (Type 2) TV Over Net or Web TV (Type 3) End-user devices should receive as many services as possible. Detailed descriptions of three types are in the following: 3
  4. 4. Type 1: Internet Video (TV) Video content that is streamed over the internet to a home PC. User has to navigate, typically via the web browser on their home PC, to a particular website, selects the desired video contents to be viewed, and wait for the video streaming to begin. Typically, content is viewed on the PC display, rather than a television display, unlike traditional TV content. Users usually need traditional PC navigation devices, such as a keyboard and a mouse, to interact with the application and make his/her content selection. In the first presentation, it is called as ‘Internet TV.’ E.g., YouTube, Google Video, etc in USA Gyao, etc in Japan. 4
  5. 5. Type 2: Telco IPTV Video services comprising a line-up of traditional TV programs, often in metaphors familiar to traditional TV users. Users typically can choose to watch a “channel” of “linear” TV content. The service is very similar, and sometimes identical, to a cable or satellite TV service. A set-top-box (STB) is used to provide the video signal to a TV receiver display in consumer's home. In some cases, a digital TV set can be a target receiver of telco IPTV services. The user typically uses a remote control to navigate, select and interact with contents. 5
  6. 6. Type 3: TV Over Net or Web TV A new TV receiver, or an adapter box, will have an Ethernet (RJ-45) jack that is used by the TV to navigate out onto the internet to access specific websites where either live or on-demand video content can be streamed to the TV. In some parts of the world, such as Japan and parts of Europe, TV receivers that previously use the internet to access non-video data (e.g., local weather, traffic conditions, sports score, etc.) are now able to access video content over the internet. User uses a remote control to navigate, through the internet-enabled TV receivers, the content selection. 6
  7. 7. Telco IPTV Service Types ‘Linear’ IPTV (Type 2) is exactly the same ‘multi- channel television’ service as Cable Television and Satellite Television systems are providing. (I learned the fact at Telecom 2006 in Hong Kong) Cable Television + DOCSIS (high-speed internet / IP-phone) = Triple-Play Telephone + Cupper-DSL (high-speed internet + IPTV) = Triple-Play FTTH (High-speed internet + IP-phone + IPTV) = Triple-Play An additional element is ‘VoD’ for which conventional Cable Television systems are not so suitable. There are quite deferent roll-out plans of IPTV services region by region. In USA, telco IPTV providers are competing with Cable Television Multiple- System Operators. MSOs are still dominant in USA and triple-play providers. In Japan, FTTH becomes quite popular right now. FTTH subscribers increased 61 % in Year 2006 and became 8.80 Millions while high-speed Cable Internet subscribers were 3.61 Millions as of the end of 2006. 7
  8. 8. High-speed internet access subscribers in Japan Horizontal: Time, e.g. [18 ] 2006, Vertical: The number of subscribers in 10 thousand. 8
  9. 9. Existing FTTH services I am receiving several ‘advertising leaflets’ inserted into newspapers in a week. There are two major FTTH providers in my area. One provider serves 100 Mbit/sec access per subscriber. The other serves shared 100 Mbit/sec access for individual household however it has additional optical-RF transmission multi-channel TV service using wavelength multiplexing (Sky-Perfect Optical). 9
  10. 10. Two examples of triple-play service using FTTH 10
  11. 11. International Standardization Activities in IEC End-user system comprises ‘terminal (device)’ and ‘end-user network.’ International Electrotechnical Committee TC 100 (Audio, video and multimedia systems and equipment) has two Technical Areas (TAs): IEC TC 100/TA 1: Terminals for audio, video and data services and content IEC TC 100/TA 9: Audio, video and multimedia applications for end- user network 11
  12. 12. IP connection within end-user network IEC TC 100 has developed two International Standards based on DLNA Specifications. IEC 62481-1 Ed.1: DLNA Home networked device interoperability guidelines - Part 1: Architecture and Protocols IEC 62481-2 Ed.1: DLNA Home networked device interoperability guidelines - Part 2: Media Formats See next page ‘DTCP-IP’ allows end-user IP network to carry HDTV content between TV receiver and digital recording devices under localization restriction (a measured RTT should be less than 7 milliseconds.) DTCP: Digital Transmission Content Protection RTT: Round Trip Time An end-user device with HDTV video decoding capability has high-speed IP connectivity using an RJ- 45 connector at least. Show an example later 12
  13. 13. Standardization in ITU-T Focus Group on IPTV ITU-T Focus Group on IPTV is discussing mainly Type 2 system (Telco IPTV). ITU-T FG IPTV WG 5 (end systems) is divided into two sub-working groups: Terminal devices (TDs) / End-user devices Home network / End-user network BC-NW Secondary Dom ai n Prm ar i y IP IPTV-NW Access Dom ai n I PTV (P-HN-S) I HN- NT ( g.NGN) e. GW (P-HN-P) I TD TD non-I P (PR-HN-S) U- I er ace nt f I -4 PI I -3 PI I -1 PI I -0/I PI P1-1 Hom e Net k wor I P-HN-P:I Hom e Net k Prm ar P wor i y I P-HN-S:I Hom e Net k Secondar P wor y PR-HN-S:Pr i ar Hom e Net k Secondar opret y wor y 14
  14. 14. MPEG2-TS or MPEG-PS ‘Linear’ IPTV (Type 2) is using MPEG2-TS mechanism. Some ‘channels’ of Linear IPTV services come from off-air digital television broadcasting that are using MPEG2-TS. MPEG2-TS may be recorded directly by end-user recording devices. Telco IPTV enterprise may provide also VoD service using file downloading mechanism into end-user recording media. Playback from end-user recording media is using MPEG-PS mechanism. Internet TV (Type 1) providers also use MPEG-Program Stream (MPEG-PS) file downloading mechanism 15
  15. 15. MPEG2-TS or MPEG-PS (Cont.) Video content is encoded into Elementary Stream (ES) by MPEG2/4-AVC Encoder. ES is transformed into Packetized Elementary Stream (PES) ‘Linear’ IPTV service is based on MPEG2-Transport Stream (MPEG2-TS). PES is carried by MPEG2-TS or MPEG-PS. MPEG2-TS makes use of PCR information in order to lock MPEG decoding 27 MHz clock to encoding 27 MHz clock frequency. MPEG2-TS makes use of ‘push’ technology. Almost of all VoD services are based on MPEG-PS. There is no need to lock MPEG decoding 27 MHz to any frequency resources. MPEG-PS is based on ‘pull’ technology supposing sufficient buffer storage without buffer-full nor buffer-empty. 16
  16. 16. An example of Telco IPTV services IP IP Multicast Unicast Stream Type Off-air channel Original VoD re-broadcasting Channels Using ‘Linear’ IPTV ‘Linear’ MPEG- MPEG2-TS/PES IPTV PS Off-air channel File Type Data Broadcasting Content MPEG2-TS/Section Downloading Carousel Transmission 17
  17. 17. Requirement of IPTV end-user devices Set Top Box or Digital Television Receiver? Some of STBs may be distribute to IPTV subscribers (end-users) by a Telco IPTV enterprise while some of them are obtained from retail market. Distributed STBs by some Telco IPTV enterprises may have ‘walled garden’ restriction for ‘linear’ TV and VoD services. HDTV output of STB may be displayed on a TV receiver using HDMI. All digital television receivers are from retail market. End-users are like to connect their own property, TV receivers, to any possible source including off-air terrestrial RF channels, satellite channels, any STBs, Internet TV, telco IPTV, WebTV, etc. Current digital TV receiver has a lot of connecters on its back panel including HDMIs, VDIs, Terrestrial Coax, Satellite Coax, IEEE-1394s, RJ-45s, etc. Show an example later. Remote controller and large screen display 18
  18. 18. IPTV Terminal Device Block Diagram (FG IPTV) Functional Architecture Block diagram of IPTV Terminal Device From FG IPTV Doc. 125 19
  19. 19. An example of end-user device block diagram BCAS Audio Card Out Audio Decoder MPEG2-TS De-MUX RF signal Coax RF De- Tuner Front End scramble Video Post Process/Overlay Processor Decoder Streaming De- Caption HDMI process cipher Communication SI/EPG Processing Port BML Internet Access Browser VoD Control MPEG-PS Controller Remote Player IPTV Channel IR Control Security Module 20
  20. 20. Protocol Stack for ‘Off-Air’ digital broadcasting TV, audio Service Multimedia service Subtitle, Multimedia coding PSI/SI Video/audio Superimpose Mono-media coding Program index Carousel Each Data stream Transmission Communication Format Protocol Section PES Section MPEG2-TS (TS packet) Two-way Network PHY of Digital Broadcasting System (non-mobile network, mobile OFDM/FEC, 8Vsb/FEC for terrestrial network) QPSK/8-PSK/FEC for satellite From ARIB STD-B24 21
  21. 21. Protocol Stack for ‘Linear’ IPTV Services TV, audio Multimedia service Service Subtitle, Multimedia coding Video/audio PSI/SI Superimpose Mono-media coding Program Carousel index Data stream Transmission Format Communication Section PES Section Protocol for TCP/IP MPEG2-TS (TS packet) Time-stamped TS / PCR de-jitter Realtime Transport Protocol TCP UDP IP Typical ‘Linear’ IPTV Service Protocol Stack 22
  22. 22. Requirement for recording and/or retention Regardless of types of end-user devices, IPTV STB or digital TV receiver, end-user devices may have retention and/or recording capability using digital recording media, such as HDD. Next digital TV receiver has a USB connector for external HDDs in addition to LAN connection. There are many rules and technologies to protect content rights and businesses. It is very hard to foresee the future of this area right now. Content protection scheme is deeply influenced by relevant all service providers (content, access, IPTV service, etc.) Removable security device is one solution. 23
  23. 23. An example of digital TV receiver back panel It has three RJ-45 connectors: one for a direct connection to HGW for 4th MEDIA (Linear IPTV and VoD provider using FTTH) One for external HDD for recording and retention One for general purpose IP connection, for special EPG, Internet TV including ‘Actvila’ (, etc. HDMI x 2 RJ-45 x 3: USB for for 1080/60P for HDD, for HDD General Purpose, and for 4th MEDIA 24
  24. 24. End-user network and IPTV services Content delivery center STB Broad casting Content Delivery PF Content provider Multicast network TV for IPTV service Audience rate STB server Router HGW Video stream TV for IPTV service DB Channel Info. Audience rate HGW: Home gate way TV for IPTV service reports System architecture of audience rating system from FG IPTV Doc. 125 This diagram may represent topological connection between Telco IPTV service providers and end-user devices (TV sets or STBs) including end-user network End-user network is complicated for IPTV subscribers and also for IPTV service providers. 25
  25. 25. Primary and secondary domains of end-user network End-user network is consist of primary domain network and secondary domain network according to the ITU-T FG IPTV Document 126. An IPTV end-user device can be connected to an Access Network through the Access Gateway and Primary Domain Network, Secondary Domain Networks in addition to RF connection to Broadcasting Service Network. BC-NW Secondary Dom ai n Prm ar i y IP IPTV-NW Access Dom ai n I PTV (P-HN-S) I HN- NT ( g.NGN) e. GW (P-HN-P) I TD TD non-I P (PR-HN-S) U- I er ace nt f I -4 PI I -3 PI I -1 PI I -0/I PI P1-1 Hom e Net k wor I P-HN-P:I Hom e Net k Prm ar P wor i y I P-HN-S:I Hom e Net k Secondar P wor y PR-HN-S:Pr i ar Hom e Net k Secondar opret y wor y 26
  26. 26. PHYs of end-user network There are four media for end-user network PHY layer. Regular wired connection: Category 5/6/7 twisted pair line Power Line Transmission TV Antenna Coaxial Cable Transmission Wireless Transmission An access provider in Japan is proposing its subscriber to rent any end- user network media except regular wired connection. 27
  27. 27. Requirement for end-user network connectivity Recording capability is very important for IPTV STB and digital TV receiver. DLNA provides content viewing of recording equipment (Digital Media Server) by a large screen flat panel display such as digital TV receiver (Digital Media Player). Content including HDTV is transmitted over IP connection of end-user network. IP connection is protected by DTCP-IP in case of Japan. End-user network is existing while there are so many cases household by household. 28
  28. 28. Closing Telco IPTV services are quite similar to multi-channel cable television services by Cable TV MSO. End-users/IPTV Subscribers are like to connect their digital TV to any possible video sources, such as off-air channels, satellite-channels, premium channels, ‘Internet TVs’, Webs, etc. TV is with large screen and remote-controller for watching with ‘sit-back’ situation. Recent digital TV receiver is just as same as PC considering their hardware architecture. IP connection devices are extremely cheap and easy to obtain from retail market. End-user network is existing but complicated. 29
  29. 29. Thank you for your attention Shuji Hirakawa, IEC TC 100 Secretary