DVB-H

DVB-H ( Digital Video Broadcasting - Handheld , in French, Diffusion Digital video - Portable ) is a system of hertzian broadcasting numerical intended for a reception on mobile terminal. The principal concurrent technology of the DVB-H is T-DMB.

Technical description

DVB-H is the last development in the continuation of standards of video transmission worked out by the project DVB and published by ETSI or CENELEC. DVB-H is an adaptation of DVB-T, the system for numerical terrestrial television (TNT), with the requirements of the receivers of pocket. DVB-H offers a channel going down to high banc usable such as it is or in complement from the mobile telecommunication networks. The technique of multiplexing per time interval makes it possible to reduce electricity consumption for the small terminals, radio the reception part having to function only during the time interval reserved for the selected program. Each time interval includes datagrams IP which can contain up to 2 Mbits of data (including the elements of control of a Reed-Solomon code).

System DVB-H was validated by ETSI (see Report TR 102401).

Although specified for fixed or slow receivers (pedestrians) the DVB-H would function correctly in vehicles up to 70 km/h, according to the operator O2.

Specifications Datacast IP

Specifications DVB for datacast IP ( DVB-IPDC ) describe a whole of components which aim at allowing the deployment of an commercial offer of mobile television based on the Internet Protocol. Indeed, it is probable that such an offer will may find it very beneficial to draw advantage from the bidirectional possibilities of symmetrical communication and of the advanced system of invoicing offered by the networks of Mobile telephony. Accordingly, DVB-IPDC defines a hybrid system on television combining a network of one-way broadcasting adapted numerical mobile with a bidirectional mobile communication network of type GPRS or UMTS.

DVB-IPDC is composed of a number of individual specifications which taken together form a complete system. The points approached are: the architecture of the system, the description of the principal cases of use, the transport and the interpretation of metadata on the system (tables PSI/SI ), the electronic guide of programs used for the discovery and selection of services, the system of purchase and protection of services, protocols of distribution of the contents ( content delivery protocol , CDP).

DVB-IPDC was initially developed to be used with DVB-H on the level of the physical layer, but it is now expected that the system can be used with other systems DVB of digital television mobile (like DVB-SH), and even generally like roadbase of any system containing IP.

The majority of the specifications were approved right now by the ETSI. The whole of the documents is freely downloadable on the http://www.dvb-h.org site.

Frequencies

DVB-H is conceived to work in the following wavebands:

VHF-III (174-230 MHz) in cohabitation with the DVB-T and the T-DAB
UHF-IV/V (470-830 MHz) in cohabitation with the DVB-T
Bande L (beach from 1,452 to 1,492 GHz) This frequency band is used today for the T-DAB and the S-DAB

Chains DVB-H can coexist with chains DVB-T in same the multiplexing. However certain conditions are necessary so that this compatibility is assured. It is necessary that the field of signal DVB-T is much more important because one passes from a reception by fixed antenna of roof to a reception on a small antenna with any profit. It is necessary also that the modulation is changed because the technical choices of the modulation are for a fixed reception whereas is needed a mobile reception.

The cohabitation between the DVB-T and the DVB-H on channels is difficult to realize because there is such a difference of field between the fixed reception of roof and the mobile reception in an apartment which receivers DVB-T find desensitized. The standard specifying the manufacture of the receivers indicates that the differential of field should not exceed 29dB whereas in the case of figure DVB-H/DVB-T, the differential is of 39dB at least.

Experiments DVB-H

Experiments DVB-H are now in hand with Helsinki, Berlin (Deutsche Telekom), Oxford (NTL), Pittsburgh, Paris, Madrid, Sydney, $the Hague, Delhi, Bern, Erlangen and in South Africa.

a complete listing of tests DVB-H and launchings of service is available on the dvb-h.org site.

has Ghent, in Flemish Belgium, of the tests as regards DVB-H are in hand via the project “Maduf”, which gathers the VRT, Belgacom, Telenet, Proximus, Siemens, Option and Scientific Atlanta. Three antennas only cover the entirety of the city, outdoor and indoor. Two smaller networks are also tested in Brussels and Malines.

Services DVB-H open or announced

In Italy, 3 Italia launched the service " La3 Live" concerning the in May 2006 worldwide, while TIM, Mediaset and Vodafone advertisement for September or October.

With the the United States, a service concerning the worldwide will be deployed by Modeo, a company belonging to Crown Castle Mobile Media. The service will start in 2006 in New York and will be extended to the thirty primary markets of the United States in 2007. The second launching of service entitled Hiwire, was announced by ITS Americom and Aloha.

In Finland, the Digita operator announced that it had signed a contract with Nokia to use his platform DVB-H for the service. The network will cover almost 30% of the country towards the end of 2006, with the launching of service to the majority of the principal markets.

In Germany, DVB-H will be launched through all the country in 2007.

In Albania, “DIGITALB” launched through all the country of services DVB-H in June 2005.

In Swiss, Swisscom Broadcast will launch a service DVB-H at the time of the Euro 2008. The service will have to cover at least 44% of the population from here end May 2008, in particular in the cities hosts (Geneva, Basle, Bern and Zurich). From here 2012, 60% of the population will have to be covered. The other operators such as Orange or Sunrise will be able to have access to the platform of diffusion.

Materials

The majority of the manufacturers offer or presented mobile phones receiving the DVB-H, as well as accessories for PDA (in the form of a SD-Card).

References

DVB-H

Principal standard DVB-H:

ETSI IN 302.304, DVB-H - Transmission System for Handheld Terminals

Reports DVB relating to DVB-H:

ETSI TR 102.377, Implementation Guidelines for DVB-H Services (concrete recommendations for the implementation of services based on DVB-H)
ETSI TR 102.377, Validation Task force Carryforward (results of experiments aiming at validating specifications DVB-H)

These documents are available on the dvb-h.org site.

Specification DVB-H is built starting from other standards DVB, whose principal ones are:

ETSI IN 301.192, Digital Video Broadcasting (DVB); DVB specifications for dated broadcasting (definition of various concepts relating to the data transmission in a system DVB)
ETSI IN 300.468, Digital Video Broadcasting (DVB); Specifications for Service Information (SI) in DVB systems (standard concerning the metadata in a system DVB)
ETSI IN 300.744, Digital Video Broadcasting (DVB); Framing structure, digital Chanel coding and modulation for terrestrial television (specifications DVB-T)

These standards are available on the site of the ETSI (cf section external bonds below).

DVB-IPDC

Specifications and reports DVB-IPDC:

ETSI TS 102.470, IP Datacast over DVB-H: PSI/SI
ETSI A096, IP Datacast over DVB-H: Set off Specifications for Phase 1
ETSI TR 102, 473 v1.1.1 IP Datacast over DVB-H: Use Cases and Services
ETSI TR 102, 469 v1.1.1 IP Datacast over DVB-H: Structure
ETSI TS 102, 471 v1.2.1 IP Datacast over DVB-H: Electronic Service Guides (ESG)
ETSI A112, Electronic Service Guides (ESG) Implementation Guidelines
ETSI A100, IP Datacast over DVB-H: Service Purchase and Protection (SPP)
ETSI TS 102.472, IP Datacast over DVB-H: Content Delivery Protocols (CDP)
ETSI A113, Content Delivery Protocols (CDP) Implementation Guidelines

These documents are available on the dvb-h.org site.

See too

Internal bonds

DAB Audio DIGITAL Broadcasting
DRM (Radio numerical world)
DVB (Broadcasting of digital video)
DVB-T (Broadcasting of digital video - terrestrial; Used by TNT)
ISDB DIGITAL (integrated Services numerical broadcasting)
T-DMB a competitor of the DVB-H, the T-DMB
MBMS- Multi-media Broadcast multicast Service
Satellite television
WiMAX
WiBro

External bonds

The Web site official DVB-H

Under the responsibility of project DVB, a specific site is devoted to the DVB-H, DVB-H.org; he proposes:

technical specifications on a page of remote loading,
a FAQ (Fair with the Questions) detailed and
a list of the products related to the DVB-H.

Technical information of EBU (European Broadcasting Union)

an article of 10 " pages; DVB-H - the emerging standard for mobile dated communication" technical review of the EBU
a collection of articles on the DVB (including DVB-H) in the files of the EBU Technical Review

Detailed information of ETSI (European Standard Telecommunications Institute)

the specifications of the ETSI are filed on its site where they are accessible starting from the page from remote loading (this bond opens the search engine of the site; a free recording is necessary to be able to download the documents with format pdf).

Other bonds

TV Phons
Mobile TV News
Mobile TV Review
Gamdala Mobile TV Blog
DigiTAG DVB-H Handbook
Uses digital video broadcasting-handheld (DVB-H) in wireless and mobile networks
Actualité of mobile television
Vidéo of presentation of DVB-H
/European Observatoire of audio-visual the

Random links: