Could cell phones act as cell phone relay towers in an emergancy?

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Discussion Overview

The discussion revolves around the feasibility of using cell phones as relay towers in emergency situations, exploring whether they could form a communications network without traditional relay towers. Participants consider both theoretical and practical aspects of such a system, including potential limitations and alternative functionalities like walkie-talkie capabilities.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that, if properly programmed, scattered cell phones could create a communications network during emergencies, although they acknowledge potential limitations.
  • Others argue that the existing hardware and software of cell phones are not designed for such a mode of communication, suggesting that the silicon in current phones cannot be reprogrammed for this purpose.
  • A participant questions whether a system could theoretically be built in to allow for such functionality, even if not feasible with current technology.
  • Concerns are raised about the signal strength of cell phones compared to cell towers, indicating that phones would need to be closer together to communicate effectively.
  • Another participant highlights the complexity of creating a system where multiple phones could communicate directly, noting the challenges of signal modulation and the limitations of current protocols.
  • One participant mentions existing hardware under the 802.15.4 standard that could facilitate a peer-to-peer network, suggesting that while it may not be suitable for traditional telephone use, it could serve a similar purpose in emergencies.

Areas of Agreement / Disagreement

Participants express a range of views, with no consensus on the feasibility of using cell phones as relay towers. While some see potential in theoretical applications, others highlight significant technical challenges and limitations.

Contextual Notes

Limitations include the dependence on existing hardware capabilities, unresolved questions about signal strength and modulation, and the complexity of necessary software changes for direct communication between devices.

Spinnor
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In an emergency could scattered cell phones form a communications network if properly programed without need for relay towers? I'm guessing such a system might have severe limitations but if the software was built in it might be an inexpensive way to keep communications going during an emergency.

Or could cell phones be reprogrammed so they acted as cheap walkie talkies?

Thanks for any ideas or help!
 
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Spinnor said:
In an emergency could scattered cell phones form a communications network if properly programed without need for relay towers? I'm guessing such a system might have severe limitations but if the software was built in it might be an inexpensive way to keep communications going during an emergency.

Or could cell phones be reprogrammed so they acted as cheap walkie talkies?

Thanks for any ideas or help!

Maybe we might have to limit such a system to only text messages, no problem for most of today's youth?
 
The system is not designed for that mode of communication. The silicon in the existing phones can't be reprogrammed to do it.
 
Antiphon said:
The system is not designed for that mode of communication. The silicon in the existing phones can't be reprogrammed to do it.

If not changeable could such a system be built in, in theory?
 
Spinnor said:
If not changeable could such a system be built in, in theory?

Better stated maybe, using existing hardware could software changes enable such a system?
 
One problem I guess. Because a cell tower can distinguish the relatively weak signal of a cell phone because of sensitive receivers the distance between cell phones would need to be smaller then the distance between a cell phone and a relay tower to communicate?

Also, as a cell tower can transmit at a greater relative power then a cell phone, cell phones would need to be closer to talk to each other, assuming proper hardware and software changes were made?
 
On top of what other people said already, I believe the cell phone signal is quite weak for one. The second and even more important, the system now is mainly each cell phone communicate only to the cell tower, the provider do all the switching. The software protocode needed in the individual phone in order to be able to selectively talk to one individual reciever would be very difficult. Imagine you have one million walkie talkie in one small area and the modulation or protocode has to be able to pin point to one reciever. I am not sure the air wave can even support this many individual transcievers.
 
Spinnor said:
Better stated maybe, using existing hardware could software changes enable such a system?

Yes, easily. But it might be quite unsuitable for use as a telephone network.

Such hardware already exists under a standard called 802.15.4. You can buy the complete radio modules for around $25.

If you are interested in pursuing this, I suggest the modules from Synapse. They are programmed in python and can form a true peer-to-peer network of the type you described. Most of the 802.15.4 protocol stacks define a special unit called a coordinator node without which you cannot form the network.
 

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