In case i have Cellular antenna in some place , and there are 2 mobile devices ( lets call them a1, a2 ) that located in different places.
Device a1 is in the range of this Cellular antenna - but device a2 are not in this Cellular antenna range.
My question is:
Is it possible to use the a1 device to make the Cellular antenna range longer - and in this way to make device a2 be in the range of this Cellular antenna ?
Thanks for any help.
So, what you propose is a kind of mesh networking for Cellular wireless. However, cellular is a very centralized technology: you can not just mimic a cell controller (BTS) on a cell phone, because it has completely different (and much more complex) functionality.
There are two possible alternatives, though:
Wireless Mesh Networks which work hop-by-hop, often based on the Wireless LAN 802.11 standard - these do not allow to forward your mobile calls, but should work on WiFi equipped mobile phones.
Picocells are offered by some DSL + Mobile providers to increase the Cellular coverage. They contain a low-power Cell which is connected to the provider's network via DSL.