14 February 2007
Geneva – 14th
– The DVB Steering Board has approved the DVB-SH (Satellite
services to Handhelds) specification. At the 53rd meeting of the DVB
Steering Board, the main executive body of the DVB Project, two documents
specifying DVB-SH were approved: a waveform specification and a description of
the system. The specification was developed by the DVB Technical Module's
TM-SSP working group.
DVB-SH is defined as a system which
is able to deliver IP based media content and data to handheld terminals like
mobile phones and PDAs via satellite. Whenever a line of sight between terminal
and satellite does not exist terrestrial gap fillers are employed to provide
the missing coverage. The DVB-SH system has been designed for frequencies below
3 GHz, typically in the S-band. It complements the existing DVB-H physical
layer standard and like its sister specification (DVB-H) uses the DVB IP
Datacast (IPDC) set of content delivery, electronic service guide and service
purchase and protection standards.
DVB-SH includes features such as
turbo coding for forward error correction and a highly flexible interleaver in
an advanced system designed to cope with the hybrid satellite/terrestrial
network topology. Satellite transmission ensures wide area coverage, with a
terrestrial component assuring coverage where the satellite signal cannot be
received, as may be the case in built-up areas. DVB-SH in fact specifies two
operational modes. SH-A specifies the use of COFDM on both satellite and
terrestrial links with the possibility of running both links in SFN mode. SH-B uses
a Time Division Multiplex (TDM) on satellite with COFDM on the terrestrial
link. A comprehensive set of guidelines for the implementation of the standard
Peter MacAvock, Executive Director
stated "DVB-SH enhances the range of DVB standards in the area of mobile
digital television. At a time when frequency availability is at a premium, it's
important to ensure that those wishing to deploy mobile TV in the S-Band can
benefit from DVB's proven record in producing successful open standards."
The DVB-SH specifications will
now be published by the DVB Project and forwarded for formal
standardisation at the European Telecommunications Standards Institute by its
Joint Technical Committee Broadcast.
Download this press release here.