Power Control; Portables; Base Stations - Nortel Meridian Companion Reference Manual

Page 96 of 102 Appendix D: Key planning concepts

Power control

Portables

Base Stations

553-3601-106 Standard 2.00 September 1996
Figure 39 : Base Stations receiving, portables transmitting
Figure 40 : Base Stations transmitting, portables receiving
Other key planning concepts, for example power control and hand-off, depend
on synchronization to function optimally.
Power control determines the transmission power of the portable. The portable
transmits in either high or low power. Low power is approximately 16 dB
lower than high power. The strength of the radio power does not affect the
volume or loudness of the sound that the user hears.
All portables within a cell appear to be at different distances to a Base Station.
A Base Station radio signals nearby portables to go to low power for the
benefit of the other Base Station radios at the same cell center. The other Base
Station radios need nearby portables to transmit in low power so they can hear
more distant portables.
When the Base Station radio perceives a weak signal strength, because the
portable is far away, the Base Station radio signals the portable to transmit in
high power.
All Base Station radios at a cell center appear to be the same distance away
from a portable. Because of this common distance, Base Stations remain in
high power.