[opendtv] Re: IEEE Ericsson article on use of LTE for TV

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 19 Jun 2012 19:26:14 -0500

Craig Birkmaier wrote:

>> What the telcos provide, in this scenario, is a two-way path. The
>> two-way path is as isolated from the one-way broadcast as a telephone
>> call is from the radio transmission, during a radio call-in show. The
>> two-way path from the telcos will provide all of the VOD.
>
> So when I use my iPhone to watch a You Tube video, telco servers are
> streaming this content?

When you use your iPhone to watch anything at all, you are using the telco 
2-way network ALWAYS. Even if it's material you stored ahead of time, it came 
from a 2-way network. The servers that stream that content may or may not 
reside inside the cellco's own network. Sometimes there are servers that mirror 
servers outside the ISP's infrastructure, to speed up response times and to 
support more unicast sessions within that ISP's network. 

There is no such thing, in these consumer oriented networks, as a single 
"return path" that gets married to a potential broadcast path. At most, there 
is a 2-way link that can be used simultaneously with an otherwise independent 
broadcast link.

Most of the time, in these consumer networks, it makes very little sense to 
ACTUALLY marry a single uplink channel to a broadcast downlink. The scaling 
doesn't work out at all. Even in a town of a few thousand people, just how much 
of a 19.39 MB/s broadcaster's downlink can you dedicate to each person or 
household? Why bother with something that doesn't scale worth a damn?

Bert

 
 
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