From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from puck.nether.net (puck.nether.net [IPv6:2001:418:3f4::5]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id BCAB13B2A4 for ; Thu, 14 Jul 2022 08:57:16 -0400 (EDT) Received: from smtpclient.apple (unknown [IPv6:2602:fe55:64:0:9d6b:8173:efd1:61de]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by puck.nether.net (Postfix) with ESMTPSA id 8227A540129; Thu, 14 Jul 2022 08:57:14 -0400 (EDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.100.31\)) From: Jared Mauch In-Reply-To: Date: Thu, 14 Jul 2022 08:57:14 -0400 Cc: Mike Puchol , Dave Taht via Starlink Content-Transfer-Encoding: quoted-printable Message-Id: <858AB3A2-EDE0-4035-A4FE-EC2313CC3197@puck.nether.net> References: <20220713173602.0582c9b3@spidey.rellim.com> <92n4s129-6r15-7q75-7293-qpo73q298srn@ynat.uz> <841ca6dc-d6d3-46ab-87c0-d6bcaa31533b@Spark> <42D3F3C5-C1B3-48EA-8C45-2540ACD787E4@gmx.de> <0C0F0D5F-7CF6-412A-AD1A-392323ADB2FB@gmx.de> To: Nitinder Mohan X-Mailer: Apple Mail (2.3696.100.31) Subject: Re: [Starlink] starlink at sea 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: Thu, 14 Jul 2022 12:57:16 -0000 I haven=E2=80=99t poked hard, but it does seem you can get it: currentCellId current_cell_id Seem to be in the GRPC proto dump from the dish. = https://github.com/sparky8512/starlink-grpc-tools/blob/main/extract_protos= et.py This should pull it out, if you want from my (stationary) dish I bet I = can run something to pull/dump the info. - jared > On Jul 14, 2022, at 8:49 AM, Nitinder Mohan via Starlink = wrote: >=20 > Hi Mike, >=20 > Do you happen to have a tool that can extract the current uplink = channel of Starlink and (more importantly) which staellite it is = connected to at any given time? I wanted to track the handovers in = Starlink and try to find its impact on network performance but cannot = seem to get those values.=20 >=20 > Thanks and Regards >=20 > Nitinder Mohan > Technical University Munich (TUM) > https://www.nitindermohan.com/ >=20 > From: Sebastian Moeller via Starlink > Reply: Sebastian Moeller > Date: 14. July 2022 at 14:35:16 > To: Mike Puchol > Cc: Dave Taht via Starlink > Subject: Re: [Starlink] starlink at sea=20 >=20 >> Hi Mike. >>=20 >> Thanks a lot. This is intersting. >>=20 >> > On Jul 14, 2022, at 14:02, Mike Puchol wrote: >> >=20 >> > The uplink is an OFDM signal with 128 subcarriers, looking at the = signal in the time domain reveals a frame length corresponding to 14% = (from memory, 1,1 us frame vs 6.7 us pause). I have two terminals 1 = meter apart and they can each achieve 30 Mbps at the same time over the = same uplink channel. I would expect the satellite to assign a particular = set of slots to a terminal. >>=20 >> So assuming the 30 Mbps being gross rate and not measured goodput: >>=20 >> 30Mbps -> 30 / (1.1/(6.7+1.1)) =3D 212.73 Mb/s while actively = sending, and=20 >> 1000000=C2=B5s/s / (6.7+1.1)=C2=B5s =3D 128205.128205 slots/sec >> (30 / (1.1/(6.7+1.1))) * 1000^2 / (1000000 / (6.7+1.1)) =3D 1659.27 = bits/slot 1659.27/8 =3D 207.41 Bytes/slot >>=20 >> with 128 subcarriers that would be approximately an average=20 >>=20 >> 1659.27/128 =3D 12.96 or ~ 13 bit/subcarrier=20 >>=20 >> if all carriers are loaded equally (which is unlikely, I expect some = re-arrangement ot bits between subcarriers to account for different = levels of noise and what not). >>=20 >>=20 >> > If there are any OFDM blind analysis experts in the room, shout! >>=20 >> Please do! >> Regards >> Sebastian >>=20 >> >=20 >> > Best, >> >=20 >> > Mike >> > On Jul 14, 2022, 13:33 +0200, Sebastian Moeller , = wrote: >> >> Hi Mike, >> >>=20 >> >>> On Jul 14, 2022, at 13:15, Mike Puchol via Starlink = wrote: >> >>>=20 >> >>> On the multiple terminals, I have verified that the duty cycle of = a consumer terminal is 14%, thus, you could have 7 terminals on a single = uplink channel with some guard time. >> >>=20 >> >> Could you elaborate how that works.how the terminals will be = interleaved in that situation? >> >>=20 >> >> Regards >> >> Sebastian >> >>=20 >> >>=20 >> >>> I have seen 30 Mbps up, so you=E2=80=99d be able to push 210 Mbps = in uplink, or a spectral efficiency of about 3.4 bps/Hz. >> >>=20 >>=20 >> _______________________________________________ >> Starlink mailing list >> Starlink@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/starlink > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink