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DVB-x for delivering services

DVB-x for delivering services. Mika Grundström mika.grundstrom@nokia.com tel. 03-272 5894. Outline. Introduction Services DVB-x specifications MPEG over DVB-x Delivering data (IP) services Conclusions. Introduction. DVB project ETSI specified standards

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DVB-x for delivering services

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  1. DVB-x for delivering services Mika Grundström mika.grundstrom@nokia.com tel. 03-272 5894

  2. Outline • Introduction • Services • DVB-x specifications • MPEG over DVB-x • Delivering data (IP) services • Conclusions

  3. Introduction • DVB project • ETSI specified standards • Delivery of video services but... • Broadcast is : • video • audio • data

  4. Services • Traditional service: • Broadcast video (MPEG-2 TS) • Newer services: • Enhanced/interactive television • VoD • KoD • MoD • Internet access

  5. The use of DVB containers

  6. DVB Broadcast Channels • There are number of broadcast channels: • DVB-S : Satellite • DVB-T : Terrestrial • DVB-C : Cable • Traditionally the use have been video broadcasting • In the future also data • Economical and massive bandwidth pipe for citizen’s Internet access

  7. DVB-x standards • DVB-S • Satellite service and on-going • Video and data (uni-directionality) • DVB-C • Cable service, on-going • Video and Internet access (bi-directionality) • DVB-T • Terrestrial service , analog switch off • Broadcast video (regulatory issues)

  8. DVB used in the world

  9. DVB-S • Mature broadcast video service via satellite • Bit rate varies max 40 Mbps • Continental scope • Internet access and data services • Requires out-of-band return channel

  10. DVB-C • Developing broadcast video service • Big potential in Internet access offering • Bit rates about 34 Mbps • Requires network update in many cases

  11. DVB-T • Trial phase, three transmitters • Bandwidth capacity 20-32 Mbps • Mobile reception possible • Unidirectional • Data services limited (regulations)

  12. DVB-T radio

  13. MPEG over DVB • Traditionally MPEG-2 TS over DVB-x • Broadcast service • Other services - MPEG-2 TS is framing • How about Video over IP over MPEG-2 TS over DVB-x? • Multiplexing dilemma

  14. Packetisation

  15. MPEG over DVB • Problem with the service provider • Duplicated service infrastructure • Content management problem • Service Information (SI) needed • User and Program information • Automatic tuning to TS • DVB Multimedia Home Platform (Java based) • Service creation

  16. Providing data services • Sharing downstream large bandwidth • Requires return channel • Routing problem • Spectrum allocation management • Location based services

  17. DVB-S data reception

  18. Data Broadcasting • DVB defined encapsulation • Multiprotocol encapsulation over MPEG-2 TS • Does not define a complete system model • Network operator has an option with the use of different technologies • Linking the Internet (bi-directional) and broadcast (unidirectional) channels is a challenge • routing issues • TCP acknowledgements • HTTP and other protocol support

  19. Data packetisation options

  20. DVB data encapsulation options Application Service Adaptation Service Adaptation Service Adaptation Service Adaptation Datagram IP Service Specific Multiprotocol Encapsulation Data Streaming DSM-CC Private Data Data Piping PES Section MPEG-2 Transport Stream

  21. MAC address structure

  22. DVB data broadcast system

  23. Data delivery using multicast in DVB

  24. demux & descra. Data delivery to portable device Optional MpegTS DVB broadcast network Multicast data Mux & Scrambling Feed sender server (router) Broadcast subnet IGMP Internet Broadcast control & management station uHTTP uHTTP UDP UDP IP IP IP IGMP DVB mpe X X DVB mpe mux & scrambling MPEG TS MPEG TS MPEG TS DVB DVB DVB DVB phy phy phy phy

  25. Protocol issues • Service Announcement Protocol • Simple protocol for informing of multicast sessions • Service Description Protocol • Describes multimedia session properties • Uni-directional Link Routing • Routing over broadcast links • Currently not applicable • Unidirectional Hyper Text Transfer Protocol • Robust protocol to transfer HTTP • retransmissions and error correction

  26. Conclusions • DVB Broadcast channels are cost-effective way providing Fast Internet Access • Content packaging is in key role • Mobile reception using DVB-T increases the number of users and possible applications • Technical solutions exist • Maturity to be achieved • Large scale deployment can be started today

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