[opendtv] Re: Internet TV distribution architecture
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 8 Jan 2014 22:10:09 +0000
Craig Birkmaier wrote:
> The actual location of the servers is largely irrelevant.
Only if you try to twist arguments just to get the last word.
Mirrored servers have to be close to the end user, within ISP networks, when
the content is popular and the owner wants a good user experience. More so, the
higher the bandwidth. The numbers are as plane as day.
Therefore, local servers are needed before the masses can use Internet
distribution of TV content. Therefore, the local broadcasters, some of them at
least, should have an opportunity here. And as an added bonus, local
broadcasters playing this role could continue the practice of local ad and news
spot insertion. Which the TV networks might appreciate. Or they can let
existing CDNs take up the slack, obviously.
> The post 911 situation was an expected anomaly given the spike in
> usage.
And so would mass migration to Internet TV viewing.
>> Here is the information that was already provided to you, but which
>> you should seek out on your own now, to make it stick. For LTE in
>> broadcast mode, what is the relationship between b/s/Hz and tower
>> spacing?
>
> It depends on what you are trying to do. If you want to cover an
> entire market with the same IP a Multicast the number of sites can
> be small
We went through an *excrutiatingly* long period before certain people finally
realized that the distance between towers in any SFN, had impact on the
spectral efficiency (hint: guard interval). Originally, DVB-T was rather
constraining, then DVB-T2, for FIXED service, relaxed that constraint. For
mobile service, where symbol duration has to be short, the tower spacing
constraint remains much like it was with DVB-T1, even when using DVB-T2.
Now we have a 2-way medium, LTE, designed for mobility and for small cells,
which includes a multicast-broadcast mode. Let's not go back to square one.
Just like DVB-T, there are specific constraints to tower spacing, in an SFN,
when LTE is used. And it should not be surprising if the LTE tower spacing
constraints are more severe than they are for a one-way big stick broadcast
medium like DVB-T.
So I ask you again. In order to approach the spectral efficiency of ATSC, what
is the tower spacing needed with LTE? You really need to dig up that number.
Bert
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