The whole article is worth reading, but tl;dr; "The promise of D2D is alluring – that we can be connected wherever we are – no more not-spots and the certainty of always being able to contact others. But the reality is some way from this. The only existing D2D service is Apple’s iPhone emergency communications which offers messaging to the emergency services and vehicle assistance in 16 countries. This does not appear to be a service Apple thinks it can charge for at present. Those offerings that have the greatest potential for ubiquity are within the MSS spectrum. But here bandwidths are too constrained to deliver full service capabilities. Other MSS operators such as Iridium have struggled to put together a commercial D2D proposition (although their core business remains strong). The other approach of using MS spectrum has strong backers in the form of SpaceX and T-Mobile as well as multiple promising start-ups. But it is beset with challenges of avoiding interference with existing terrestrial use, overcoming restrictions in border areas, ensuring compliance with hundreds of regulators, of which only one has a defined policy towards D2D at present, doing deals with hundreds of operators and managing other regulatory hurdles. Only US-based coverage looks likely any time soon and the true extent of that remains unclear. With limited offers, the consumer interest will be less. Quite how much less is very unclear, but it is clear that the business case will be challenging. Most consumers appear to have limited interest in paying more per month for better coverage. In summary, D2D’s alluring promise of ubiquitous fully-featured global connectivity is not likely to be realised any time soon, if ever, but a reduced service level in a few countries may be sufficient to justify launching suitable satellites." All the best, Frank Frantisek (Frank) Borsik https://www.linkedin.com/in/frantisekborsik Signal, Telegram, WhatsApp: +421919416714 iMessage, mobile: +420775230885 Skype: casioa5302ca frantisek.borsik@gmail.com On Tue, Jun 4, 2024 at 1:43 PM Alexandre Petrescu via Starlink < starlink@lists.bufferbloat.net> wrote: > does it say whether it is text only, data only, or everything including > voice? > Le 04/06/2024 à 13:20, Frantisek Borsik via Starlink a écrit : > > 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 > > Signal, Telegram, WhatsApp: +421919416714 > > iMessage, mobile: +420775230885 > > Skype: casioa5302ca > > frantisek.borsik@gmail.com > > > On Tue, Jun 4, 2024 at 2:54 AM David Lang wrote: > >> Eugene Y Chang wrote: >> >> >> On Jun 3, 2024, at 12:41 PM, David Lang 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 > > > _______________________________________________ > Starlink mailing listStarlink@lists.bufferbloat.nethttps://lists.bufferbloat.net/listinfo/starlink > > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink >