Earlier quoted context omitted.
It sounds like you don't even need the hard part for a viable product: range extender for cell phones targeted at people engaged in outdoor activities but parked somewhere with cell phone reception.
Technically, this has been possible for a long time, but it is not allowed for regulatory reasons, and those regulations are not just there because somebody enjoys being a killjoy. Radio transmission and networks are a complex subject matter. Most of all, they're a scarce, common resource and it's easy to mess things up for others. If you want real off the grid connectivity, buy or rent a sat phone or a satellite eme…
Alternatively, wouldn't it be conceivable for transmitting nodes to cooperate with one another to send transmissions. For example, if N nodes all transmit encrypted content on the same band to M receivers, then the signals of all but one of those N transmitters look like noise to each of the M receivers, thus limiting the transmission rate achievable over any given channel. If instead of that approach, what if a transmitter instead used a second frequency solely for the purpose of coordinating transmissions with the other nodes so as to minimize interference which each other. In addition to coordinating when they are or are not transmitting, couldn't they selective choose different modulation techniques that are easily distinguishable from one another, and thus transmittable simultaneously.
Feel free to educate or correct me here. I know very little about this domain.