Variable rate closed loop power control for wireless communication systems
First Claim
1. A wireless communications apparatus, comprising:
- a circuit that extracts power control information present at a variable rate in a wireless signal transmitted by a first wireless communications device; and
a power control circuit that generates as a function of said power control information a signal operative to establish a power level for a wireless transmission signal to said first wireless communications device.
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Accused Products
Abstract
A system and method for variable rate closed loop power control in a wireless communications system, such as a CDMA spectrum system. A base station receives the reverse link transmission from a wireless terminal unit (WTU) and determines the signal quality of the reverse link, measures the signal-to-interference ratio (SIR) or other signal quality indicators of the received signal to determine any power adjustments required for the uplink transmission power. The base station also processes the uplink transmission signal to determine whether the rate of transmitting power control data to the WTU should be changed from the current rate. If so, the base station either (1) sends a power control rate change command to the WTU via the downlink, and sends subsequent power control commands at the newly determined rate, or (2) sends subsequent power control commands at the newly determined rate without sending a power control rate change command. The WTU determines the power control rate, either by extracting the power control rate change command or by performing blind rate detection, and recovers subsequent power control commands at the new rate. Closed loop power control for controlling the power of downlink transmissions from the base station to the WTU may be implemented in a similar manner to provide variable rate (bandwidth) closed loop power control channels.
81 Citations
20 Claims
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1. A wireless communications apparatus, comprising:
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a circuit that extracts power control information present at a variable rate in a wireless signal transmitted by a first wireless communications device; and
a power control circuit that generates as a function of said power control information a signal operative to establish a power level for a wireless transmission signal to said first wireless communications device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communications apparatus, comprising:
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a power control circuit that generates power control information based on a quality metric for a wireless signal transmitted by a first wireless communications device; and
a circuit that determines a variable rate for transmitting the power control information via a first wireless signal to said first wireless communications device. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for closed loop control of the power of a first wireless signal transmitted by a first wireless communications apparatus to a wireless communications apparatus, the method comprising:
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said first wireless communications apparatus receiving a wireless signal from said wireless communications apparatus;
said first wireless communications apparatus extracting power control information present at a variable rate in the received wireless signal; and
said first wireless communications apparatus generating as a function of the power control information a signal operative to establish a power level for said first wireless signal. - View Dependent Claims (16, 17)
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18. A method for closed loop control of the power of a first wireless signal transmitted by a first wireless communications apparatus to a wireless communications apparatus, the method comprising:
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said wireless communications apparatus receiving the first wireless signal from said first wireless communications apparatus said wireless communications apparatus generating power control information based on a quality metric for the received first wireless signal; and
said wireless communications apparatus determining a variable rate for transmitting the power control information via a wireless signal to said first wireless communications device. - View Dependent Claims (19, 20)
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Specification