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Revision as of 12:57, 26 October 2006

DVB-H (Digital Video Broadcasting - Handheld) is a technical specification for bringing broadcast services to handheld receivers. was formally adopted as ETSI standard EN 302 304 in November 2004. The DVB-H specification (EN 302 304) can be downloaded from the DVB-H Online website[1]. The major competitor of this technology is Digital Multimedia Broadcasting (DMB).

Technical Explanation

File:DVB-H-framestructure.png
DVB-H Frame structure

It is the latest development within the set of DVB transmission standards. DVB-H technology adapts the successful DVB-T (Digital Video Broadcasting - Terrestrial) system for digital terrestrial television to the specific requirements of handheld, battery-powered receivers. DVB-H can offer a downstream channel at high data rates which can be used standalone or as an enhancement of mobile telecoms networks which many typical handheld terminals are able to access anyway. Time slicing technology is employed to reduce power consumption for small handheld terminals. IP datagrams are transmitted as data bursts in small time slots. Each burst may contain up to 2 Mbits of data (including parity bits). There are 64 parity bits for each 191 data bits, protected by Reed-Solomon codes. The front end of the receiver switches on only for the time interval when the data burst of a selected service is on air. Within this short period of time a high data rate is received which can be stored in a buffer. This buffer can either store the downloaded applications or playout live streams. The achievable power saving depends on the relation of the on/off-time. If there are approximately ten or more bursted services in a DVB-H stream, the rate of the power saving for the front end could be up to 90%. DVB-H is a technical system which was carefully tested by the DVB-H Validation Task Force in the course of 2004 (see ETSI Technical Report TR 102 401).

IP Datacast

The term IP Datacast is used by DVB for the technical elements required to create DVB-H based services and those that are necessary to integrate DVB-H in a hybrid network structure consisting of both a mobile communications network such as GPRS or UMTS and an additional DVB-H downstream. The set of specifications for IP Datacast (phase1) was approved by DVB in October 2005.

With the advent of DVB-H, there are significant challenges for the systems which underlie DVB broadcast services. Amongst the issues are the harmonisation of service discovery and selection, purchase and protection between the broadcast and the mobile telecommunications worlds. In the IP world of DVB-H, such issues need to build upon the stability of the broadcast world, and embrace the successful methods of the telecommunications world. If there are 30 DVB-H services available, one will need to ensure that there are appropriate electronic programme guidelines and service protection arrangements. In November 2005 DVB finalised a set of specifications for the IP datacasting domain which will be published by ETSI at the beginning of 2006.

Frequencies

DVB-H is designed to work in the following bands:

  • VHF-III (174-230 MHz, or a portion of it)
  • UHF-IV/V (470-830 MHz, or a portion of it)
  • L (1.452-1.492 GHz)

DVB-H can coexist with DVB-T in the same multiplex.

DVB-H+

DVB-H+ is a hybrid (satellite/terrestrial) architecture using S band. A similar architecture has been already used in S-DMB, XM Satellite Radio, Sirius Satellite Radio, MobaHo! but DVB-H+ promise to be more powerful. It incorporates a high power geostationary satellite for outdoor and light indoor coverage integrated with a terrestrial repeater (low power gap-filler) network for indoor coverage in urban areas.

Alcatel expects to deliver DVB-H+ terrestrial repeaters in 2007 and to launch, with Eutelsat, a DVB-H+ satellite (covering Europe) in 2008. Chip maker DiBcom is designing a chipset that will be compatible with the DVB-H standard working in the S-Band, Sagem is developing DVB-H phones that support both UHF and S-Band. At the moment it's not an official DVB Forum standard. There was already a Study Mission called DVB-SSP (Satellite Services to Portable Devices) and in June 2006 TM-SSP[2] started to develop standards. DVB Forum plans to release definitive standard at half 2007.

French Agence de l'innovation industrielle is now financing this effort through TVMSL, a project leaded by Alcatel that plans to develop a DVB-H standard suitable for hybrid satellite and terrestrial transmission. Other partners involved in TVMSL are Sagem, Alenia, RFS, Philips, DiBcom, TeamCast, UDcast, CNRS, INRIA, CEA-LETI.[3]

Trials

DVB-H trials are now underway in Singapore, Helsinki, Berlin, Oxford, Pittsburgh, Paris, Madrid, Sydney, South Africa, The Hague, Brussels, Bern and Erlangen[4][5].

Service launches

In Finland, the license to operate a DVB-H network was awarded to Digita in March 2006. In May 2006 they announced that they had signed a contract with Nokia to use its DVB-H platform for the service. The network will cover almost 30% of the country by the end of 2006, with the service launching in most of the major markets.

In Italy, 3 Italia launched nationwide services in May 2006, both Telecom Italia Mobile (TIM) and Mediaset in June 2006, Vodafone is expected in September or October.

In the United States, a nationwide service will be rolled out by Modeo a company owned by Crown Castle Mobile Media. The service will begin in 2006 in New York City and will roll out to the top thirty markets in the USA during 2007. Modeo owns 5MHz of spectrum nationwide at 1600MHz. At the NAB trade show in April 2006, a second service launch was announced by SES Americom and Aloha Partners. Titled Hiwire Mobile Television, the service is set to begin trials in Las Vegas in Q4 2006. Hiwire owns two 6 MHz channels of spectrum at 700MHz covering most of the country.

In France, Germany, Spain and South Africa nationwide service launch could be planned for 2007.

In China two companies have been issued licenses by the government, Shanghai Media Group and China Central Television. Trials are currently underway, with service launch expected before the 2008 Beijing Olympics.

Development tools

  • Tea Vui Huang's DVB-H ESG Simulator[6] simulates Modeo, Nokia N92 and Sagem myMobileTV DVB-H handsets.

References

  1. ^ www.dvb-h-online.org
  2. ^ DVB TM-SSP
  3. ^ [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]
  4. ^ [13]
  5. ^ A comprehensive list of DVB-H trials and service launches is available from dvb-h.org.
  6. ^ DVB-H ESG Simulator

7. IBM Primetime for Mobile Television - Extending the entertainment concept by bringing together the best of both worlds - IBM Institute for Business Value studies [14]

See also

  • DVB-H.org official DVB-H website of the DVB Project, includes extensive information on trials, technical specifications for download, a detailed FAQ, and an indication of DVB-H related products
  • Mobile DTV Alliance -- information about DVB-H activities in North America and the Mobile DTV Alliance

Technical information

DVB-H Chipset Development

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