US 5,267,262 AGranted

Transmitter power control system

AssigneeQUALCOMM Incorporated

InventorCharles E. Wheatley, III

Life of this patent

Estimating the term…

Loading patent…

Abstract

A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so that mobile unit transmitted signals arrive at the cell-site at a desired power level.

Claims19

Dependent claims

A first station transceiver having a receiver for receiving and demodulating a second station transmitted spread spectrum communication signal, and a transmitter for transmitting a first station spread spectrum communication signal to said second station, said transceiver having a power control system for controlling signal power of said first station spread spectrum communication signal about a predetermined power level as received at said second station, wherein said second station measures signal power of said first station spread spectrum communication signal as received at said second station, generates power adjustment commands according to variations in said measured signal power with respect to said predetermined power level and transmits said power adjustment commands in said second station spread spectrum communication signal, said power control system comprising:

control processor means coupled to said receiver for receiving said power adjustment commands and generating a corresponding closed loop power level control signal;
automatic gain control means coupled to said receiver for measuring signal power of said second station spread spectrum communication signal as received by said receiver, and providing a corresponding power measurement signal;
conversion means coupled to said receiver for determining signal power of said second station spread spectrum communication signal as received by said receiver and generating an open loop power level set signal with respect to predetermined level setting parameters;
comparator means for comparing said power measurement signal and said open loop power level signal, and providing a corresponding open loop power level control signal;
and
amplifier means for receiving said open loop and closed loop power level control signals, receiving and amplifying said first station spread spectrum communication signal at a gain determined by said open loop and closed loop power level control signals, and providing said amplified first station spread spectrum communication signal to said transmitter for transmission to said second station.

3 more elements

In a remote station transceiver having a receiver for receiving a base station transmitted spread spectrum communication signal, and a transmitter for transmitting to said base station a remote station generated spread spectrum communication signal, a power control circuit for controlling transmission signal power of said remote station spread spectrum communication signal, comprising:

communication signal, comprising:
an automatic gain control circuit coupled to said receiver, said automatic gain control circuit receiving and performing an analog measurement of signal power of said base station spread spectrum communication signal as received by said receiver and generating a resultant first power signal;
a conversion circuit coupled to said receiver, said conversion circuit performing a digital measurement of signal power of said base station spread spectrum communication signal as received by said receiver and generating a resultant second power signal;
a comparison circuit coupled to said automatic gain control circuit and said conversion circuit, said comparison circuit differentially integrating said first and second power signals and generating a resultant a first control signal;
and
an amplifier circuit coupled to said comparison circuit and said transmitter, said amplifier circuit receiving said first control signal, and receiving and amplifying said remote station spread spectrum communication signal at a gain determined by said first control signal.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/773,067Filed 8 Oct 1991 · continuation in part
Priority: 7 Nov 1989
Granted: 30 Nov 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04W 52/52
Transmission power control [TPC]: using AGC [Automatic Gain Control] circuits or amplifiers
H04W 52/0245
Using monitoring of external events, e.g. the presence of a signal: according to signal strength
H04W 52/06
Transmission power control [TPC]: tPC algorithms
H04W 52/08
TPC algorithms: closed loop power control