Re: 900MHz packet radio?

mad mad at auth.se
Thu Sep 1 16:40:10 UTC 2011


Hi Paul,

another point to assess is if it is feasible at all to use these devices with a to-be-developed p2p protocol in terms of practicability to operate them in the field as you intend.

Because there is still the issue of power consumption you can not get around so easily.
GSM phones can maintain their high standby-times only by relying on stable basestations to be able to switch off their transceivers for most of the time.

As Sylvain stated there has to be a master kind of imitating the BS for its neighbours to sync on. This master most certainly had to send a beacon all the time so its battery would drain quickly. The operation time in master mode would be significantly less than the usual speech-time of that phone, so not much more than very few hours.

As there is only a short radio range, all participating devices had to act as a master for some time of their operation and suffer from this energy consuming mode, especially in loosely covered areas where are no or few other devices reachable.

It's just my view that this should be considered, too, before making huge efforts to implement sth. like this for the intended purpose.
Of course it would be a cool addon to osmocom-bb and this shouldn't keep anybody from doing this for the sake of rising to the challenge. ;-)


Regards,
  Mad




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