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DVB-SH System for Broadcasting to Handheld Devices. Guided by Dr. K.R. Rao Irfan Kerawalla [email protected] Introduction. Mobile TV is expected to become one of the largest markets for mass media.

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Dvb sh system for broadcasting to handheld devices l.jpg

DVB-SH System for Broadcasting to Handheld Devices

Guided by Dr. K.R. Rao

Irfan Kerawalla

[email protected]


Introduction l.jpg
Introduction

  • Mobile TV is expected to become one of the largest markets for mass media.

  • Growing number of mobile phone users around the globe has triggered excessive demand for multimedia content.

  • People are constantly on the move and want all the latest updates ranging from news to social life on their fingertips.

  • Users want high quality multimedia content delivered at fast speed.


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What is DVB-SH?

  • DVB-SH (Digital Video Broadcast - Satellite Services to Handheld Devices) is the name of a transmission system standard designed to deliver video, audio and data services to vehicles and handheld devices

  • It is designed to use frequencies below 3GHz, typically around 2.2GHz.

  • The system and waveform specifications have been published as ETSI standards. (TS 102 584, TS 102 585 and EN 302 583). [1]


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Applications of DVB-SH

  • Broadcasting of radio and TV content.

  • Broadcasting of audio or video content customized for mobile TV (e.g. virtual TV channels, podcasts,).

  • Data delivery (“push”), e.g. for ring tones, logos.

  • Video-on-demand services.

  • Informative services (e.g. news) including location-based services.

  • Interactive services via an external communications channel

    e.g. Universal Mobile Telecommunications System(UMTS).



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Time Slicing

  • The objective of time-slicing is to reduce the average power consumption of the terminal and enable smooth and seamless service handover. [8]

  • Time-slicing enables a receiver to stay active only a fraction of the time, while receiving bursts of a requested service.

  • Time-slicing also supports the possibility to use the receiver to monitor neighboring cells during the off-times.

  • By accomplishing the switching of the reception from one transport stream to another during an off period it is possible to accomplish a handover decision.


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Orthogonal frequency division multiplexing (OFDM)

  • It is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method.

  • OFDM (Orthogonal Frequency Division Multiplexing) [8] is the natural choice for terrestrial modulation and is the basis of both the DVB-H and DVB-T systems. DVB-SH introduces a second scheme, a time division multiplex (TDM), leading to two reference architectures termed SH-A and SH-B: [8]

  • • SH-A uses OFDM both on the satellite and the terrestrial link

  • • SH-B uses TDM on the satellite link and OFDM for the terrestrial link.


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Compression in DVB-SH

  • DVB-SH uses H.264/AVC compression standard.


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Band used for DVB-SH transmission

Figure 4: S-Band used in DVB-SH transmission [7]

DVB-SH seeks to exploit the less congested, higher frequency, S-band where

there are opportunities for mobile satellite services (MSS) systems, operating in conjunction with complementary ground components (CGC).


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Block diagram of the DVB-SH system

Figure 5. Conceptual description of a DVB-SH system [11]



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Basic parameters in DVB physical layer

Table 1. Physical layer parameters and data rates of DVB-SHsystem [11]



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DVB-SH systems in the United States

  • The telecom operator AT&T has agreed to buy spectrum in the lower 700 MHz frequency band licensed by Qualcomm. [12]

  • Alcatel Lucent has hosted successful trials of DVB-SH systems across the United States. [12]

  • ICO Global Communications has successfully launched a satellite named ICO G1 specifically for mobile television. [12]


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References:

[1] ETSI EN 301192: Digital Video Broadcasting (DVB); DVB specification for data broadcasting (DVB-DATA).

[2] ETSI TS 102005: Digital Video Broadcasting (DVB); Specification for the use of video and audio coding in DVB services delivered directly over IP.

[3] ETSI EN 300468: Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems (DVB-SI).

References [1][2]and[3] can be accessed on

http://www.dvb-h.org

[4] DVB BlueBook A079 Rev. 1: IP Datacast over DVB-H: PSI/SI.

http://broadcasting.ru/pdf-standard-specifications/internet%20protocol/a079.pdf

[5] DVB BlueBook A111: Framing structure, channel coding and modulation for Satellite Services to Handheld devices (SH) below 3GHz.

http://www.dvb.org/(RoxenUserID=9b5031601a81d830f6f38d9ed110cb03)/technology/standards/a111_DVB-SH_Specification.pdf


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[6] DVB-Scene edition No. 21: A New Star in the Sky, by Prof. Dr-Ing. Ulrich Reimers.

[7]P. Kelley, C. Rigal, “DVB-SH in S-band”

References [6] and [7] can be accessed from http://www.ebu.ch/fr/technical/trev/trev_311-dvb_sh.pdf

[8] DVB-SH fact sheet 0409, April 2009

http://www.dvb-h.org/PDF/dvb-sh-fact-sheet.0409.pdf

[9] ETSI EN 302304 V1.1.1. (2004-11): Digital Video Broadcast

www.dvb-h.org

[10]Block diagram for encoder and decoder of H.264

http://nuntius.com/technology3.html

[11] Faria et al. “DVB-H: Digital broadcast services to handheld devices”, Proceedings of the IEEE, vol. 94, no. 1, January 2006, pages 195 – 197.

[12] DVB news updates

http://www.dvb.org/about_dvb/dvb_worldwide/usa/


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Thank you Prof. Dr-


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