Automatic power control system for a code division multiple access (CDMA) communications system
First Claim
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1. A method of Maintenance Power Control (MPC) for a subscriber unit (SU) which conducts wireless communication with a base station in a wireless communication system, the method comprising:
- providing a transmitter having an awake phase for transmitting signals to a base station which are initialized at a selected initial power level and a powered down sleep phase;
when in said sleep phase, periodically activating the transmitter to transmit a status signal; and
adjusting the selected initial power level downwardly when a reply signal is received and upwardly when no reply signal is received within a predetermined time period of the transmission of a status signal whereby the selected initial power level is maintained at a level for efficient system communications.
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Abstract
A receiver receives signals and noise over a frequency spectrum of a desired received signal. The desired received signal is spread using code division multiple access. The received signals and noise are demodulated to produce a demodulated signal. The demodulated signal is despread using a code uncorrelated with a code associated with the desired received signal. A power level of the despread demodulated signal is measured as an estimate of the noise level of the frequency spectrum.
122 Citations
14 Claims
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1. A method of Maintenance Power Control (MPC) for a subscriber unit (SU) which conducts wireless communication with a base station in a wireless communication system, the method comprising:
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providing a transmitter having an awake phase for transmitting signals to a base station which are initialized at a selected initial power level and a powered down sleep phase;
when in said sleep phase, periodically activating the transmitter to transmit a status signal; and
adjusting the selected initial power level downwardly when a reply signal is received and upwardly when no reply signal is received within a predetermined time period of the transmission of a status signal whereby the selected initial power level is maintained at a level for efficient system communications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A subscriber unit (SU) having Maintenance Power Control (MPC) for wireless communication with a base station in a wireless communication system, the SU comprising:
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a transmitter having an awake phase for transmitting signals to a base station which are initialized at a selected initial power level and a powered down sleep phase;
a receiver and associated MPC circuitry for controlling the selected initial power level of said transmitter;
said transmitter, when in said sleep phase, configured to become periodically active to transmit a status signal; and
said receiver and associated MPC circuitry configured to adjust the selected initial power level downwardly when a reply signal is received and upwardly when no reply signal is received within a predetermined time period whereby the selected initial power level is maintained at a level for efficient system communications. - View Dependent Claims (12, 13, 14)
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Specification
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Current AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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Original AssigneeInterdigital Technology Corporation (InterDigital, Inc.)
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InventorsOzluturk, Fatih, Kowalski, John, Lomp, Gary
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current370/311
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CPC Class CodesG06F 13/374 using a self-select method ...H03H 17/0226 comprising look-up tablesH03H 17/06 Non-recursive filtersH04B 1/707 using direct sequence modul...H04B 1/7075 with code phase acquisitionH04B 1/70753 Partial phase searchH04B 1/70754 Setting of search window, i...H04B 1/70755 Setting of lock conditions,...H04B 1/70758 Multimode search, i.e. usin...H04B 1/7077 Multi-step acquisition, e.g...H04B 1/708 Parallel implementationH04B 1/7085 using a code tracking loop,...H04B 1/709 Correlator structureH04B 1/7093 Matched filter typeH04B 1/711 the interference being mult...H04B 1/7115 Constructive combining of m...H04B 1/712 Weighting of fingers for co...H04B 2201/70701 featuring pilot assisted re...H04B 2201/70702 Intercell-related aspectsH04B 2201/70703 using multiple or variable ...View All
