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charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Subject: Re: [Starlink] Starlink power use & satellite tracking X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Feb 2023 12:36:51 -0000 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=20 >> gateway. There is, however, no reason why a user's packets could not=20 >> travel via a diversity of satellites. > > In theory you are correct, but I don't think they are doing that yet.=20 > We had a discussion of the signaling protocol and someone posted that=20 > they had done research and found that there was only one satellite=20 > illuminating a cell at a time. IIRC this was when the paper came out=20 > on using starlink signals for positioning. Given that the number of satellites has effectively doubled over the=20 last year, does this still hold? For handover purposes, dishy must be=20 tracking multiple satellites anyway, and exchanging successive packets=20 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=20 upload / download power usage half-way through each test. The result=20 shows a significantly stronger correlation between power use and=20 download final rate than between power use and upload final rate. Of=20 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=20 that would keep its signal processor a little busier than if it only=20 received from one. So maybe it's that. Or maybe we're looking at one=20 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=20 80-100 W range with the thing, maybe as low as 60 W if I caught it=20 lucky. But now it's within the official specs of 40-75 W most of the=20 time, and it's changed this week. > > As they launch more satellites and get the in-space routing up and=20 > running, I expect that they will change that at some point. > > it is an interesting question. > > David Lang > > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink > --=20 **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) The University of Auckland u.speidel@auckland.ac.nz http://www.cs.auckland.ac.nz/~ulrich/ ****************************************************************