Some additional reading from William Webb:

https://www.linkedin.com/pulse/satellite-direct-device-workable-william-webb-sonke/?trackingId=Sjha4DY8SqONFA9g%2Bb5b%2Bw%3D%3D

All the best,

Frank

Frantisek (Frank) Borsik



https://www.linkedin.com/in/frantisekborsik

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On Tue, Jun 4, 2024 at 2:54 AM David Lang <david@lang.hm> wrote:

> Eugene Y Chang wrote:
>
> >> On Jun 3, 2024, at 12:41 PM, David Lang <david@lang.hm> wrote:
> >>
> >> Eugene Y Chang wrote:
> >>
> >>> I expect low data rate because the distance will fall back to a lower
> coding rate.
> >>
> >> I think it's going to be more a matter of very large cells, so many
> people sharing the available bandwidth
> >>
> >>> I observe a difference in my phone’s batter life between urban and
> rural usage. I expect the battery life to be significantly reduced with
> Starlink.
> >>> And yes… if the phone isn’t communicating then the battery life isn’t
> drawn down much…
> >>
> >> In my experience, a phone that's trying to find a tower uses more power
> than one that has a tower, but is otherwise idle
> >
> > When the phone is searching for a tower, it is transmitting at maximum
> power.
> > Then, the phone adjusts the transmit power according to the distance to
> the tower,
> > In an urban environment, the distance to the tower is usually less (i.e.
> smaller cells due to subscriber density).
> > In a rural environment, there is more distance to the tower, and the
> phone is transmitting at higher power (i.e., towers are farther apart for
> larger cells due to fewer subscribers per tower, up to the max tower
> separation.)
> > When you are mobile, the power is proportionate to the mean distance to
> the tower during your operations.
>
> and for direct-to-satellite, it's going to be a max power situation,
> similar to
> rural.
>
> But when a phone is not connected, how frequent are it's searches for
> towers
> (especially if it has multiple bands to check) compared to the 'keepalive'
> pings
> when it is connected? if it's doing more transmissions for it's search and
> attempts to connect than it does while connected and just confirming the
> connection, that could eat more power.
>
> David Lang