Re: [Starlink] Starlink Roaming

[Sebastian Moeller <moeller0@gmx.de>]

Intersting!

Silly question, giving that there are already law suits for people pointing lasers at airplanes, how are these commercial laster terminals avoiding that issue?

Regards
	Sebastian




> On Feb 22, 2022, at 08:42, Mike Puchol <mike@starlink.sx> wrote:
> 
> I did over-simplify so the point was better understood. On the optical gateways, these exist already: https://mynaric.com/products/ground-capabilities/
> 
> Once you have an optical mesh in orbit, the only practical way to provide it with massive capacity is optical links - there isn’t enough radio spectrum that would do it (without a massive ground gateway network with enough physical separation). You can create a network of optical gateways that guarantees a number of them will not be impared by cloud cover at any given time. Optical has the advantage of being license-free, too.
> 
> Best,
> 
> Mike
> On Feb 22, 2022, 10:20 +0300, Dick Roy <dickroy@alum.mit.edu>, wrote:
>>  
>>  
>> From: Starlink [mailto:starlink-bounces@lists.bufferbloat.net] On Behalf Of Mike Puchol
>> Sent: Monday, February 21, 2022 9:35 PM
>> To: Daniel AJ Sokolov; David Lang
>> Cc: starlink@lists.bufferbloat.net
>> Subject: Re: [Starlink] Starlink Roaming
>> 
>>  
>> Actually, laser links would make gateway connectivity *worse*. If we take the scenario attached, one gateway is suddenly having to serve traffic from all UTs that were not previously under coverage. 
>> 
>> A satellite under full load can saturate two gateway links by itself. If you load, say, 20 satellites in an orbital plane, onto a single gateway, over ISL, you effectively have 5% of each satellite’s capacity available (given an equal distribution of demand, of course there will be satellites with no UTs to cover etc.).
>> 
>> [RR] I think to do this analysis correctly; one needs to consider the larger system and the time-varying loads on the components thereof. What you say is true; just a bit over-simplified to be maximally useful. Routing through complex congested networks is well-studied problem and hnts at possible solutions can probably be found thereJ)
>> 
>> 
>> 
>> Eventually they will go for optical gateways, it’s the only way to get enough capacity to the constellation, specially the 30k satellite version.
>> 
>> [RR] What do you mean by “”optical gateway”? An optical link from the satellite to the ground station? That would be real expensive at least power-wise and unreliable.
>> 
>> 
>> Best,
>> 
>> Mike
>> 
>> On Feb 22, 2022, 05:17 +0300, David Lang <david@lang.hm>, wrote:
>> 
>> 
>> On Mon, 21 Feb 2022, Daniel AJ Sokolov wrote:
>> 
>> 
>> On 2022-02-21 at 13:52, David Lang wrote:
>> 
>> 
>> 
>> They told me that I could try it, and it may work, may be degraded a
>> bit, or may not work at all. They do plan to add roaming capabilities in
>> the future (my guess is that the laser satellites will enable a lot more
>> flexibility)
>> 
>> 
>> Isn't that a very optimistic assessment? :-)
>> 
>> Laser links are great for remote locations with very few users, but how
>> could they relieve overbooking of Starlink in areas with too many users?
>> 
>> The laser links can reduce the required density of ground stations, but
>> they don't add capacity to the network. Any ground station not built
>> thanks to laser links adds load to other ground stations - and, maybe
>> more importantly, adds load to the satellite that does eventually
>> connect to a ground station.
>> 
>> Can laser links really help on a large scale, or are they just a small
>> help here and there?
>> 
>> 
>> My thinking is that the laser links will make it possible to route the traffic
>> from wherever I am to the appropriate ground station that I'm registered with as
>> opposed to the current bent-pipe approach where, if I move to far from my
>> registered location, I need to talk to a different ground station.
>> 
>> Currently there are two limits in any area for coverage:
>> 
>> 1. satellite bandwidth
>> 2. ground station bandwidth
>> 
>> laser links will significantly reduce the effect of the second one.
>> 
>> We know that they can do mobile dishes (they are testing it currently on Elon's
>> gulfstream, FAR more mobile that I will ever be :-) )
>> 
>> David Lang
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