From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.lang.hm (unknown [66.167.227.145]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 546243CB37 for ; Tue, 30 Aug 2022 17:09:57 -0400 (EDT) Received: from dlang-mobile (unknown [10.2.2.70]) by mail.lang.hm (Postfix) with ESMTP id 6651614567F; Tue, 30 Aug 2022 14:09:56 -0700 (PDT) Date: Tue, 30 Aug 2022 14:09:56 -0700 (PDT) From: David Lang To: Mike Puchol cc: starlink@lists.bufferbloat.net In-Reply-To: <7b7bff13-b0ef-41ad-9a40-d12bfe5a0dfe@Spark> Message-ID: References: <1661878433.14064713@apps.rackspace.com> <7b7bff13-b0ef-41ad-9a40-d12bfe5a0dfe@Spark> MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="===============5478790277712446322==" Subject: Re: [Starlink] Starlink "beam spread" 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: Tue, 30 Aug 2022 21:09:57 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --===============5478790277712446322== Content-Type: text/plain; format=flowed; charset=UTF-8 Content-Transfer-Encoding: 8BIT On Tue, 30 Aug 2022, Mike Puchol via Starlink wrote: > • Multiple beams over a single cell: up to eight spot beams can be projected > onto a single cell without running into EPFD limits, as long as each one uses > one of the eight frequencies available. These simultaneous beams could come > from one or more satellites. This is how you can get additional capacity to a > cell, for example, to compensate for reduction by TDM. Two beams at 50% duty > cycle make up for one full beam. The advantage is spatial diversity, where a > terminal that has one satellite obstructed could opt from a beam from a > different, non-obstructed satellite. you can also have multiple beams per cell by talking to satellites that are sufficiently far apart that the ground station can form it's beam to hit one satellite without interfering with the other. The groudn receivers that are listening to multiple satellites on the same frequency will have a higher noise level, but can still use beam forming to hear one more efficiently than another. lower altitude satelites also reduce the cell size (improving frequency re-use), and Starlink is intending to start putting up sats (340Km vs the current 550Km) The Starlink V2 satllites are also significantly larger, with more and larger antennas, which translates into more beams, and tighter beams. David Lang --===============5478790277712446322== Content-Type: text/plain; CHARSET=utf-8 Content-Transfer-Encoding: BASE64 Content-ID: <997265sr-62r5-94n9-9p48-9nso833ro067@ynat.uz> Content-Description: Content-Disposition: INLINE X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KU3Rhcmxpbmsg bWFpbGluZyBsaXN0ClN0YXJsaW5rQGxpc3RzLmJ1ZmZlcmJsb2F0Lm5ldApodHRwczovL2xpc3Rz LmJ1ZmZlcmJsb2F0Lm5ldC9saXN0aW5mby9zdGFybGluawo= --===============5478790277712446322==--