RE: BT delivers on cost-saving plan 18 months early and inks OneWeb deal2 Nov 2021 12:24
This isn't far behind the announcement that Starlink are in talks with Vodafone to lease spectrum.
"Elon Musk’s Starlink in talks with Vodafone for UK expansion"
https://www.telegraph.co.uk/business/2021/10/24/elon-musks-starlink-talks-vodafone-uk-expansion/
https://www.ispreview.co.uk/index.php/2021/10/starlink-seeks-leo-satellite-spectrum-boost-from-vodafone-uk.html
I'm somewhat sceptical about long range mmwave transmission, due to weather limitations, and the fact that 1000's of satellites whizzing around the planet could one day give the Earth a mini equivalent of Saturn's rings lol.
They could possibly use multiple ground stations with very high gain phased arrays, or large dishes, for backhaul communication with the satellites, possibly alleviating the weather related issues on the high Frequency backhaul links.
I haven't paid much attention to OneWeb, with all the recent hype around Starlink. Apparently, OneWeb satellites orbit around 1200Km, so over double the altitude of Starlink satellites at 550Km, therefore OneWeb will have more latency, but less issues with line of sight, due to obstacles obstructing satellites that aren't immediately overhead.
Pythagoras gives some interesting calculations, suppose you had a OneWeb and Starlink satellite over John O Groats, both directly overhead linking to their respective customers, and both backhauling to Ground stations near lands end.
Some back of a fag packet fun calculations, using Pythagoras and Speed=Distance/Time:
OneWeb:
Distance to satellite from customer dish 1200Km
Lands End to John O Groats Distance 1,407Km
Downlink from satellite to Land End Ground station 1849Km
Total link distance customer to Ground station 1200+1849Km=3409Km
Free space one way latency for full distance 11.36ms
For Starlink:
Distance to satellite from customer dish 550Km
Lands End to John O Groats Distance 1,407Km
Downlink from satellite to Land End Ground station 1,511Km
Total link distance customer to Ground station 550+1511Km=2,061Km
Free space one way latency for full distance 6.87ms
Hopefully I haven't made any silly mistakes
So the Starlink latency is better on paper, but in real life line of sight to the nearest satellites, for the customer and Ground station would affect the latency. Other things might come into play to, like distance added for inter satellite communication, and retransmission due to noise.
This website tracks the orbits of the Starlink and OneWeb Satellites:
https://satellitemap.space/
It shows the Polar orbits of the OneWeb constellations, compared to the Starlink constellations. Starlink appear to currently have many many more satellites in orbit than OneWeb.