Re: [Starlink] SpaceX/Starlink says it's ready for a fall satellite-to-cell service with T-Mobile

[Eugene Y Chang <eugene.chang@ieee.org>]

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> 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.



> 
>> But users with high screen times will have to change their habits.
>> — avoid receiving text messages (not under the user’s control)
>> — don’t receive email pushes
>> — stop all the social media updates, messages, and likes.
>> — turn off the apps
>> — only use the phone for emergencies.
>> 
>> Who are the intended users?
> 
> emergancy communication in areas that currently have zero service, primarily text messages, then voice, then low bandwidth data.
> 
> David Lang
> 
>> Gene
>> ----------------------------------------------
>> Eugene Chang
>> IEEE Life Senior Member
>> IEEE Communications Society, Computer Society, & Signal Processing Society,
>>   Hawaii Chapter Chair
>> IEEE Life Member Affinity Group Hawaii Chair
>> IEEE Entrepreneurship, Mentor
>> eugene.chang@ieee.org
>> m 781-799-0233 (in Honolulu)
>> 
>> 
>> 
>>> On Jun 3, 2024, at 11:16 AM, David Lang <david@lang.hm> wrote:
>>> 
>>> This is a fallback that will only be if there is no other coverage, and will be a poor data rate.
>>> 
>>> I would expect that the impact to the phone battery would be less than the phone continually searching for a tower
>>> 
>>> Also, SpaceX has pushed back, according to them this isn't observed interference with their signals, instead they reconfigured a satellite to the direct-to-phone frequencies and were able to detect them
>>> 
>>> we'll see what the real story is.
>>> 
>>> On Mon, 3 Jun 2024, Eugene Y Chang via Starlink wrote:
>>> 
>>>> Date: Mon, 3 Jun 2024 10:47:32 -1000
>>>> From: Eugene Y Chang via Starlink <starlink@lists.bufferbloat.net <mailto:starlink@lists.bufferbloat.net> <mailto:starlink@lists.bufferbloat.net <mailto:starlink@lists.bufferbloat.net>>>
>>>> Reply-To: Eugene Y Chang <eugene.chang@ieee.org <mailto:eugene.chang@ieee.org> <mailto:eugene.chang@ieee.org <mailto:eugene.chang@ieee.org>>>
>>>> To: Frantisek Borsik <frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com> <mailto:frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com>>>
>>>> Cc: Dave Taht via Starlink <starlink@lists.bufferbloat.net <mailto:starlink@lists.bufferbloat.net> <mailto:starlink@lists.bufferbloat.net <mailto:starlink@lists.bufferbloat.net>>>
>>>> Subject: Re: [Starlink] SpaceX/Starlink says it's ready for a fall
>>>>   satellite-to-cell service with T-Mobile
>>>> I found this line in the article very interesting: The larger 2nd generation SpaceX satellites can connect to the majority of T-Mobile’s 4G and 5G phones over its 1900 MHz spectrum.
>>>> 
>>>> It is exciting a subscriber does not need to buy a new phone.
>>>> What is the expected impact to the phone’s battery life?
>>>> Any speculations?
>>>> 
>>>> Gene
>>>> ----------------------------------------------
>>>> Eugene Chang
>>>> eugene.chang@ieee.org <mailto:eugene.chang@ieee.org>
>>>> o 781-799-0233
>>>> 
>>>> 
>>>> 
>>>> 
>>>>> On Jun 3, 2024, at 8:08 AM, Frantisek Borsik via Starlink <starlink@lists.bufferbloat.net <mailto:starlink@lists.bufferbloat.net>> wrote:
>>>>> 
>>>>> SpaceX & T-Mobile intend to launch direct-to-device (D2D) satellite servicethis fall
>>>>> An analyst told us that will give them an 18- to 24-month lead over some rivals
>>>>> AT&T & Verizon are still backing AST SpaceMobile as an alternative
>>>>> 
>>>>> https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile <https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile><https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile <https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile>><https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile <https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile><https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile <https://www.fierce-network.com/wireless/space-x-says-its-ready-fall-direct-satellite-cell-service-t-mobile>>>
>>>>> 
>>>>> All the best,
>>>>> 
>>>>> Frank
>>>>> 
>>>>> Frantisek (Frank) Borsik
>>>>> 
>>>>> 
>>>>> 
>>>>> https://www.linkedin.com/in/frantisekborsik <https://www.linkedin.com/in/frantisekborsik> <https://www.linkedin.com/in/frantisekborsik <https://www.linkedin.com/in/frantisekborsik>> <https://www.linkedin.com/in/frantisekborsik <https://www.linkedin.com/in/frantisekborsik> <https://www.linkedin.com/in/frantisekborsik <https://www.linkedin.com/in/frantisekborsik>>>
>>>>> Signal, Telegram, WhatsApp: +421919416714
>>>>> 
>>>>> iMessage, mobile: +420775230885
>>>>> 
>>>>> Skype: casioa5302ca
>>>>> 
>>>>> frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com> <mailto:frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com>> <mailto:frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com><mailto:frantisek.borsik@gmail.com <mailto:frantisek.borsik@gmail.com>>>_______________________________________________
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