Data Dissemination and Broadcasting Systems Lesson 10 Digital video Broadcasting and Mobile TV

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2 Digital video Broadcasting (DVB) Analog TV AM transmission for video component and FM transmission for audio component DVB early 1990s Commercialized in 2000 DVB-H for Mobile TV commercialized since early 2006 Oxford University Press All rights reserved. 2

4 DVB-T VHF ( MHz) and UHF ( MHz) OFDM Multiple carriers with each carrier using mutually orthogonal codes Each carrier 8 MHz block FHSS Between 5 and 30 Mbps DVB receiver data rate for downlink at user Oxford University Press All rights reserved. 4

6 Multi-carrier transmission and multiplexing in each carrier Facilitates single frequency networks (SFN) for multiple applications Multiplexing of TV broadcaster, Internet service provider, mobile service provider channels, and service information tables Oxford University Press All rights reserved. 6

7 Service information tables MPEG container in four tables for the set top boxes 1. Event (current status) information table 2. Service description table with broadcast service names, parameters, and multiplexed channels information 3. Network information table 4. Time and date information table Oxford University Press All rights reserved. 7

8 DVB MPEG Encoding formats MPEG-2/DVB single channel HDTV (high definition TV) pixel MPEG-2/DVB multiple channels EDTV (enhanced definition TV) MPEG-2/DVB multiple channels SDTV (standard definition TV) 640 or pixel, MPEG-2/DVB multiple channels multimedia data broadcasting Oxford University Press All rights reserved. 8

10 Additional Protocols of DVB DVB-VBI (vertical blanking interval) for conversion from DVB to analog TV Data connections DVB-DATA, return channels (for GSM, DECT, PSTN, ISDN, Satellite) Oxford University Press All rights reserved. 10

11 Additional Protocols of DVB Protocol DVB-IPI, DVB-NPI (Network protocol independent) and DVB-Text for text and DVB-SUB for sub-titling on the video frames Oxford University Press All rights reserved. 11

12 Multimedia home platform DVB-MHP (multimedia home platform) Java based For development of consumer video system applications, interfaces for network card control, application download, and layered graphics Oxford University Press All rights reserved. 12

14 Mobile TV DVB-H DVB-H broadcast downlink channel Used by mobile service provider DVB-T/DAB/IP data broadcaster with high rates Data broadcast rates 5 Mbps to the handheld devices Oxford University Press All rights reserved. 14

15 Mobile TV DVB-H DVB-H broadcast uplink channel Mobile TV devices also uplink and interact with mobile service provider network (enhanced telecommunication mobile GSM/GPRS network) Oxford University Press All rights reserved. 15

Mobile TV/DVB-H broadcasting architecture for downlink to

17 Commercial mobile TV started In early 2006 in Oxford, UK Participating companies Arqiva/O2 with content providers BBC, ITV, Turner Broadcasting, Shorts International, Discovery, Eurosport, MTV, Channel 4, Five TV, and BSkyB Broadcast for receiving the signals on mobile TV as well for 16 popular TV programs Oxford University Press All rights reserved. 17

18 Transmission TV services use OFDM DVB-T transmission standard Multiplexed data at second stage carried all over the globe using high speed Internet using IP datacast Oxford University Press All rights reserved. 18

19 Transmission At third stage, the IP datacast networks to a mobile service provider application distribution system (MSPADS) This system finally provides service to handheld devices Only subscribed based service using DVB- H service Oxford University Press All rights reserved. 19

20 Transmitter for Oxford SFN 9 Harris Semiconductor transmitters transmit and each employs SFN multiplexing ½ FEC QPSK modulation 10 Time-slices for 16-programs IP datacast Technique IPSec for security Oxford University Press All rights reserved. 20

21 Standard broadcast frequency spectra Band IV (554 MHz), VHF Band III ( MHz) or a portion of it UHF Band IV/V ( MHz) or a portion of it Band L ( GHz) DVB-H can coexist with DVB-T in the same multiplex DVB-H+ hybrid (satellite/terrestrial) architecture using S band Oxford University Press All rights reserved. 21

23 Oxford SFN Data burst slots Within a data burst slot, the transmission of data at rate higher than the one used for display on the screen Data bursts store in a device-buffer From the device-buffer, the device either caches the application data or can play it live on its small LCD screen Oxford University Press All rights reserved. 23

24 Oxford SFN Data burst slots Data bursts store in a device-buffer From the device-buffer, the device either caches the application data or can play it live on its small LCD screen The front end of the receiver device switches on only for those time intervals when the data burst of a selected BBC or discovery channel service is on air Oxford University Press All rights reserved. 24

26 Four Steps DVB for High-speed Internet Access 1. A handheld device transmits the device request through uplink channel to MSPADS 2. MSPADS passes the request to Internet through cable and to video channel through Internet Oxford University Press All rights reserved. 26

27 Four Steps DVB for High-speed Internet Access 3. Video channel sends the response using DVB-IPI to high speed Internet. 4. The Internet service datacasts the data to MSPADS using DVB-C through a cable connection Oxford University Press All rights reserved. 27

28 DVB for High-speed Internet Access IP datacasting enables high speed Internet access through Internet service provider (ISP) IP datacast then employed by DVB-H for connecting handheld devices Device accesses to high speed Internet and to a remote-networked video channel linked to Internet Oxford University Press All rights reserved. 28

High speed Internet access architecture Oxford

30 Convergence of Broadcasting and Mobile Communication A device accesses Internet IPv4, high speed Internet IPv6, and a remote networked data service, TV broadcast service, or video channel linked to Internet Oxford University Press All rights reserved. 30

31 Convergence of Broadcasting and Mobile Communication DVB-H+ and convergence of mobile, Internet, and broadcasting network architecture DVB-H+ provides hybrid network Oxford University Press All rights reserved. 31

32 Use of IP datacast Due to, it has become feasible to use DVB-H+ for accessing Internet, mobile telephone, and TV, audio, and satellite broadcast services Oxford University Press All rights reserved. 32

33 Steps for convergence of mobile and Internet broadcasting and network 1. A handheld device transmits the device request through uplink channel to mobile base station 2. The base station functions as a MSPADS and connects to IPv4 Internet through GPRS gateway which networks the device to the IPv4 service provider The device is thus able to get Internet IPv4 service Oxford University Press All rights reserved. 33

34 Steps 3. Base station passes the request for high speed Internet IPv6 access through cable using DVB-C 4. IPv6 Internet connects to a multiplexer using DVB-IPI Oxford University Press All rights reserved. 34

35 Steps 5. The multiplexer connects to video channel or TV service through DVB-T and to data service using DVB-data 6. Data service, video channel, or TV station transmits the response to the multiplexer and multiplexer uses DVB-IPI protocol to communicate to high speed Internet using the IPv6 protocol Oxford University Press All rights reserved. 35

36 Steps 7. The Internet IPv6 service datacasts the data to MSPADS using DVB-C through a cable connection 8. MSPADS transmits the response to the device request through a downlink using DVB-H+ to the handheld device Oxford University Press All rights reserved. 36

39 Summary IP datagrams transmitted as data bursts in small time slots by TDMA by the Mobile service provider application distribution system Convergence of mobile and Internet broadcasting and network Oxford University Press All rights reserved. 39

Data Dissemination and Broadcasting Systems Lesson 09 Digital Audio Broadcasting

Data Dissemination and Broadcasting Systems Lesson 09 Digital Audio Broadcasting Oxford University Press 2007. All rights reserved. 1 Digital Audio Broadcast System (DAB) OFDM carrier FHSS based technique