Automatic power control system for a code division multiple access (CDMA) communications system
First Claim
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.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
14 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
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:
-
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)
-
Specification