On 18/02/2023 11:52 pm, David Lang wrote:
On Sat, 18 Feb 2023, Ulrich Speidel via Starlink wrote:
This requires the satellite to be in view of both terminal and
gateway. There is, however, no reason why a user's packets could not
travel via a diversity of satellites.
In theory you are correct, but I don't think they are doing that yet.
We had a discussion of the signaling protocol and someone posted that
they had done research and found that there was only one satellite
illuminating a cell at a time. IIRC this was when the paper came out
on using starlink signals for positioning.
Given that the number of satellites has effectively doubled over the
last year, does this still hold? For handover purposes, dishy must be
tracking multiple satellites anyway, and exchanging successive packets
with different satellites shouldn't be all that difficult then.
I've just run a series of 20 speedtest.net test and tried to spy the
upload / download power usage half-way through each test. The result
shows a significantly stronger correlation between power use and
download final rate than between power use and upload final rate. Of
course, it's a small sample, and I'll try to do a few more tomorrow.
Of course, if it receives from multiple birds at the same time, then
that would keep its signal processor a little busier than if it only
received from one. So maybe it's that. Or maybe we're looking at one
bird with multiple channels/bursts, also imposing a higher compute load?
Also intriguing: In the past, we used to see typical power usage in the
80-100 W range with the thing, maybe as low as 60 W if I caught it
lucky. But now it's within the official specs of 40-75 W most of the
time, and it's changed this week.
As they launch more satellites and get the in-space routing up and
running, I expect that they will change that at some point.
it is an interesting question.
David Lang
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Dr. Ulrich Speidel
School of Computer Science
Room 303S.594 (City Campus)
The University of Auckland
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http://www.cs.auckland.ac.nz/~ulrich/
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