If the power control is slightly off, for a moment,
under heavy load, the most critical handsets are
lost, affects everyone.
GSM/EDGE has the handsets more separated, isolated, more
independent, one problematic handset cannot cause problems
for everyone. Instead a problematic handset can be given
"special treatment", neighboring time slots and channels
(wich interfere the most) can be reallocated.
Channels can also be moved from neighbouring cells to a
crowded cell, like a rock concert or sports happening,
conference.. (dynamic channel allocation within 7 or 4
cell clusters)
--
The handset has to forward and reverse the timing,
position of it's TX time slot so that all time slots
arrive non-overlapping to the basestation, which
tells them what tot do.
This is also the inherent way of measuring the
distance, one tick is, if I remember right, 200m.
(it was obviously not designed for location, just
to synchronize the time slots for far and near
handsets)
Ilmarinen |
