Back to results
US 2002/0173309 A1Published application
Fast forward power control during soft handoff
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsReza Shahidi, Nirmal Velayudhan
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsReza Shahidi, Nirmal Velayudhan
Estimating the term…
A wireless communication network includes base stations that operate with variable transmit power adjustments during soft handoff of a mobile station. Base stations adjust current transmit powers up or down using variable step sizes responsive to power control commands from the mobile station. Step size depends on the difference between current transmit power and a common reference power. Generally, power control commands that move transmit power away from the common reference power are attenuated by decreasing the step size, and those that move the transmit power toward the reference power are amplified by increasing step size. A base station controller adjusts the common reference power during soft handoff to reduce differences between it and the current transmit powers. Thus, step size may be large at the outset of soft handoff to quickly reduce transmit power imbalance between base stations, but tends to decrease with subsequent adjustments of the common reference power.
A method of controlling transmit powers at a plurality of base stations during a soft handoff to reduce power imbalance between base stations, the method comprising:
A wireless communication network comprising:
A method for controlling a common reference power used by a plurality of base stations during a soft handoff to vary step size of forward link transmit power adjustments, said method comprising:
A base station controller for controlling a common reference power used by a plurality of base stations during a soft handoff to vary step size of forward link transmit power adjustments, the base station controller comprising:
The base station controller of claim 47 wherein the power measurement report includes the number of error frames since the last power measurement report.
A processor for controlling a common reference power used by a plurality of base stations during a soft handoff to vary step size of forward link transmit power adjustments, said processor programmed to adjust the common reference power responsive to power measurement reports from the mobile station.
Dependencies are inferred from the claim text.