From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-x530.google.com (mail-ed1-x530.google.com [IPv6:2a00:1450:4864:20::530]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 883543CB41 for ; Mon, 2 Aug 2021 19:50:29 -0400 (EDT) Received: by mail-ed1-x530.google.com with SMTP id y7so24495266eda.5 for ; Mon, 02 Aug 2021 16:50:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=roQ5kRVRxkPoOGhY3BKm22dd5/avyqbo+t8qFzcaTsY=; b=OtRnyQLwCHc9cmurx7yas03Yl1CYrhFSvCdwzaI9AJjuav6NFyLKSTwdbB3MfTUTgl n+FgqRWe+PsqxsfwxafRMDYFCaauYKelMqXPVDnYvbd+uDDV/3CvRMnuVwYrOri01mVc t+Cw5dPSMsmaUPzVIEnZPuGdhAeLrdosqUAFY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=roQ5kRVRxkPoOGhY3BKm22dd5/avyqbo+t8qFzcaTsY=; b=JlE8OOLpoLhkRXqbiFajRRk7+rPDO7DKQ/8AwdcVyLkQf/VOsIZTdwVoKLJqbG5x6k xhtO209x44MBHzVEIohFExxEh4hZatYwVV1Qt9FvUGq2eXRA85j75JxTOcdp2rE1znwM fYAqjztj1wjnTv38JdUEVuRNXJW3KwzoUGwrbDzPX66WtPhlaNPwNobjJ+PwjqkLIel6 dqToWbK729nGjE3jTuc2XsWIcYBqWxOT1xbUeH0TwEhEC5PH3Vz86DdSoovQwBF6b0JN RV3PQxrpPORdzm+36/lSHLeDGO/B7TqxfDM6KVln0yPNDBnT8Jsvuncv5YiX3dHWZoC7 JfJA== X-Gm-Message-State: AOAM532OAujRAZEbdaGyHOzvwKfyziT/EIPVffWS/UXW8FttZhgvAQNS DTt5AnUh14tyYjH0kMTDB+Luc+QsTpdjDDZbSCPvtVPMOf6Rqu/fnKlhNqaSoLpmzDO/JezwHRy feSN18uP6Aw9Jgk84ebNR9E5QY31WkNPedQ== X-Google-Smtp-Source: ABdhPJw6UxD4eK8mkJpPFZ4cHdZ44iRYhnHONL089fdQUiZVslSdaQ+7iCmfJwYP+LNrvkrscoZWZmYZZsomZGdoyj8= X-Received: by 2002:a05:6402:14da:: with SMTP id f26mr22844451edx.259.1627948227935; Mon, 02 Aug 2021 16:50:27 -0700 (PDT) MIME-Version: 1.0 References: <1625188609.32718319@apps.rackspace.com> <989de0c1-e06c-cda9-ebe6-1f33df8a4c24@candelatech.com> <1625773080.94974089@apps.rackspace.com> In-Reply-To: From: Bob McMahon Date: Mon, 2 Aug 2021 16:50:17 -0700 Message-ID: To: David Lang Cc: Luca Muscariello , Cake List , Make-Wifi-fast , Leonard Kleinrock , starlink@lists.bufferbloat.net, codel@lists.bufferbloat.net, cerowrt-devel , bloat , Ben Greear Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000db87fe05c89c3bef" Subject: Re: [Cake] [Make-wifi-fast] [Starlink] [Cerowrt-devel] Due Aug 2: Internet Quality workshop CFP for the internet architecture board X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Aug 2021 23:50:29 -0000 --000000000000db87fe05c89c3bef Content-Type: multipart/alternative; boundary="000000000000d76dfe05c89c3b29" --000000000000d76dfe05c89c3b29 Content-Type: text/plain; charset="UTF-8" That distance matrices manage energy between nodes. The slides show a 5 branch tree to realize 4 nodes (and that distance matrix) and a diagram for 11 degrees of freedom for 6 nodes (3 BSS) The python code will compute the branch attenuations based on a supplied distance matrix. There will of course be some distance matrices that cannot be achieved per the reduction of the degrees of freedom required to realize this using physical devices in a cost effective manner. Bob On Mon, Aug 2, 2021 at 4:16 PM David Lang wrote: > If you are going to setup a test environment for wifi, you need to include > the > ability to make a fe cases that only happen with RF, not with wired > networks and > are commonly overlooked > > 1. station A can hear station B and C but they cannot hear each other > 2. station A can hear station B but station B cannot hear station A > 3. station A can hear that station B is transmitting, but not with a > strong > enough signal to decode the signal (yes in theory you can work around > interference, but in practice interference is still a real thing) > > David Lang > > -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. If you received this e-mail in error, please return the e-mail to the sender, delete it from your computer, and destroy any printed copy of it. --000000000000d76dfe05c89c3b29 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
That distance matrices=C2=A0manage energy between nodes.= =C2=A0 The slides show a 5 branch tree to realize 4 nodes (and that distanc= e matrix) and a diagram for 11 degrees of freedom for 6 nodes (3 BSS)=C2=A0= The python=C2=A0code will compute the branch attenuations based on a suppl= ied distance=C2=A0matrix. There will of course be some distance matrices th= at cannot be achieved=C2=A0 per the reduction of the degrees=C2=A0of freedo= m required to realize this using physical=C2=A0devices=C2=A0in a cost effec= tive manner.

Bob

On Mon, Aug 2, 2021 at 4:16 PM David Lang <david@lang.hm> wrote:
If you are going to setup a test en= vironment for wifi, you need to include the
ability to make a fe cases that only happen with RF, not with wired network= s and
are commonly overlooked

1. station A can hear station B and C but they cannot hear each other
2. station A can hear station B but station B cannot hear station A
3. station A can hear that station B is transmitting, but not with a strong=
enough signal to decode the signal (yes in theory you can work around
interference, but in practice interference is still a real thing)

David Lang


This ele= ctronic communication and the information and any files transmitted with it= , or attached to it, are confidential and are intended solely for the use o= f the individual or entity to whom it is addressed and may contain informat= ion that is confidential, legally privileged, protected by privacy laws, or= otherwise restricted from disclosure to anyone else. If you are not the in= tended recipient or the person responsible for delivering the e-mail to the= intended recipient, you are hereby notified that any use, copying, distrib= uting, dissemination, forwarding, printing, or copying of this e-mail is st= rictly prohibited. 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