[opendtv] Re: RadioScape queries viability of DVB-H for mobile multimedia

  • From: Mark Aitken <maitken@xxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 16 May 2005 16:29:16 -0400

Trying to be nice, and not trying to hold any personal agenda to gain, I 
question the nature of the information being presented...

Is he confusing spectrum related issues to make blame? DVB-H can be 
considered an option for DVB-T, but this piece leaves me with the 
distinct impression that not all is understood by the speaker in this 
case. For example...

Sabel will note during his presentation that DVB-H is a
modification of Digital Video Broadcast - Terrestrial
(DVB-T) for handheld devices but has spectrum allocation
issues as many countries are currently using these
frequencies for analogue television.


The fact that DVB-T is being used in (currently analog) television bands 
is a matter of choice (and purpose), but the DVB-H service can ride on 
many different wavelengths (frequencies), as can DMB/DAB (DVB-T can be 
used in the GHz bands if one wishes, dependent on designed service)... 
Is it easier to use a different band and bandwidth? Depends!
Perhaps, depending on the operator, and dependent on the service, and 
dependent on the business, and dependent on the licensing issues (to 
name a few variables)...
Perhaps not, depending on the operator, and dependent on the service, 
and dependent on the business, and dependent on the licensing issues (to 
name a few variables)...

Everyone has an agenda...

Manfredi, Albert E wrote:

>This article refers to the transmitter power required for
>large area coverage of wide band signals, vs the same
>wide area coverage of narrow band signals. Even if the
>duty cycle is short, as it is in DVB-H, this doesn't
>change the propagation characteristics of the signal.
>The main advantage of the short duty cycle is to the
>receiver's power requirement.
>
>Of course, they too have their agenda to push.
>
>Bert
>
>------------------------------------------------
>RadioScape queries viability of DVB-H for mobile multimedia
>
>John Walko
>(05/16/2005 8:01 AM EDT)
>URL: http://www.eetimes.com/showArticle.jhtml?articleID=3D163103709
>
>LONDON - Digital radio specialist RadioScape has raised
>serious concerns about the technical and commercial
>viability of using Digital Video Broadcast-Handheld (DVB-H)
>technology for delivering multimedia services to mobile
>handsets, suggesting that the alternate Digital Multimedia
>Broadcasting (DMB) technology favoured by carriers in the
>Far East is superior. Addressing the GSPx Mobile Conference
>in Eindhoven, the Netherlands Tuesday (May 17), Les Sabel,
>vice president of technology for RadioScape will outline
>the results of the trials in Cambridge, England, that he
>says show that the design of DMB networks can proceed using
>essentially the same rules as for current DAB audio
>networks.
>
>He will stress that DMB, unlike DVB-H, is based on proven
>DAB technology with spectrum, transmission towers and
>capacity already available for it in most countries.
>
>Sabel will note during his presentation that DVB-H is a
>modification of Digital Video Broadcast - Terrestrial
>(DVB-T) for handheld devices but has spectrum allocation
>issues as many countries are currently using these
>frequencies for analogue television.
>
>"DMB is viewed by many as the next logical step in the
>evolution of DAB," says Sabel. "More importantly, it could
>also represent the next step in the evolution of mobile
>phones delivering the vision of video and data on the move
>that 3G promised but cannot deliver in a cost effective
>and efficient manner. A one-to-many broadcast technology,
>such as DMB, provides a broadband pipe of multimedia
>services that the one-to-one approach of 3G can only
>provide in small numbers and expensively."
>
>Despite the huge impetus building around DVB-H , Sabel
>says indications are that for that technology to work
>effectively in mobile and indoor environments it will need
>to use transmission parameters similar to DAB. This will
>eliminate any real capacity advantages and still leave
>DVB-H with the issue of transmission power requirements
>due to its larger bandwidth.
>
>"Our field trials show that good DMB reception can be
>achieved with existing DAB transmitters that only use low
>amounts of power to cover a large footprint," says Sabel.
>He adds: "I have yet to see any comparative, quantitative
>evidence for DVB-H but, recent discussions indicate that
>for DVB-H to achieve the same footprint, network
>providers will typically require a five times greater
>density of transmitters."
>
>According to Sabel, this will make DVB-H very expensive to
>establish and run - let alone the possibility of public
>concerns over yet more transmission towers. "DMB clearly
>offers a much better, more cost effective solution for
>operators that can be implemented now as it based on
>proven DAB technology as can be evidenced by DMB pioneers
>in countries such as Korea and China where trial systems
>are already up and running."
>
>He adds that recent studies of the power requirements
>suggest that reliable mobile operation is unlikely with
>DVB-H unless the network uses QSPK modulation. Coupled
>with the propagation issues this throws up, Sabel says a
>DVB-H network is likely to need a transmitter density that
>is at least five times that of DAB/DMB networks.
>
>The WorldDAB organization has been enhancing the existing
>Eureka 147-based standard, notably adding an outer layer
>coding (OLC) scheme. Service based enhancements, such as
>Electronic Program Guides, conditional access and
>multimedia object transfer have also been added and are
>expected to be agreed and standardized within months.
>
>RadioScape believes that these and the introduction of
>Enhanced Stream and Packet modes provide the additional
>error protection necessary for the robust delivery of
>multimedia content mobile operators are seeking.
>
>All material on this site Copyright 2005 CMP Media LLC.
> 
> 
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-- 

Regards,
Mark A. Aitken Director, Advanced Technology

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