Radiotelephone transmission power control
First Claim
1. A method for dynamically adjusting operating power levels in a radiotelephone system including at least first and second stations, each having a transmitter and a receiver for a predetermined radio channel, said method comprising the steps ofmeasuring, in said second station, levels of signals received from said first station,adjusting output power of said transmitter of said second station, in response to results of said measuring step, to be at a level which will be received within a predetermined level range at said first statin,determining in said second station an appropriate power level of transmission for said first station to bring said received signal levels at said second station into a predetermined range at said second station and which is independent of said first station range, anddirecting said first station to adjust its transmitter power to said appropriate power level.
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Accused Products
Abstract
Power levels of first and second stations (10, 11) in a cellular radiotelephone system are dynamically adjusted from only one (10) of them. The second station receives signals from the first and, on the basis of the level of those signals, first adjusts its own transmitter power level to be within a predetermined range and then directs the adjustment of the power level of the first station to be within a predetermined range. Parameters used in processing call handoffs are also adjusted to correspond to the power level adjustments to prevent false handoffs due to the power level changes.
416 Citations
11 Claims
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1. A method for dynamically adjusting operating power levels in a radiotelephone system including at least first and second stations, each having a transmitter and a receiver for a predetermined radio channel, said method comprising the steps of
measuring, in said second station, levels of signals received from said first station, adjusting output power of said transmitter of said second station, in response to results of said measuring step, to be at a level which will be received within a predetermined level range at said first statin, determining in said second station an appropriate power level of transmission for said first station to bring said received signal levels at said second station into a predetermined range at said second station and which is independent of said first station range, and directing said first station to adjust its transmitter power to said appropriate power level.
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11. A method for dynamically adjusting operating power levels in a cellular mobile radiotelephone system including at least a first movable station and a second fixed station, each station having a transmitter and a receiver for a predetermined radio channel, at least said fixed station including means for interrupting a subscriber communication on said channel for transmitting a burst of data signal, said method comprising the steps of
measuring, in said fixed station, levels of signals received from said movable station, adjusting output power of said transmitter of said fixed station, in response to results of said measuring step, to be at a level which will be received within a predetermined level range at said movable station, determining in said fixed station an appropriate power level of transmission for said movable station to bring said received signal levels at said fixed station into a predetermined range at said fixed station and which is independent of said movable station range, and directing, by a data signal burst, said movable station to adjust its transmitter power to said appropriate power level in a single step.
Specification