Power control system for transmission chain in a transceiver
First Claim
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1. A transceiver, comprising:
- a transmitter circuit operable to up convert a first transmission signal into a first physical uplink channel, the transmitter circuit having;
a transmission amplification circuit having a first adjustable gain and a maximum power level that is providable by the first adjustable gain of the transmission amplification circuit, wherein the transmission amplification circuit is operable to amplify the first transmission signal in accordance with the first adjustable gain; and
a coupler connected to generate a transmit feedback signal having a signal level associated with a current power level of the first transmission signal;
an antenna tuner having an impedance response, wherein the antenna tuner is coupled to receive the first transmission signal from the transmission amplification circuit;
a receiver circuit operable to down convert a first receive signal out of a first physical downlink channel, wherein the first receive signal includes transmission power control information for adjusting the current power level of the first transmission signal to a first desired power level; and
a power control system operably associated with the transmitter circuit wherein the power control system is configured to;
adjust the first adjustable gain of the transmission amplification circuit based on the signal level of the transmit feedback signal and the transmission power control information so as to reduce a difference between the current power level of the first transmission signal and the first desired power level; and
adjust the impedance response of the antenna tuner to reduce the difference between the current power level of the first transmission signal and the first desired power level when the maximum power level that is providable by the first adjustable gain is reached by the transmission amplification circuit and when the first desired power level is above the maximum power level of the transmission amplification circuit.
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Abstract
A transceiver is provided that has a power control system, which can internally control the current power level of a transmission signal within a physical uplink channel. The transceiver includes a transmitter circuit with a coupler, which generates a transmit feedback signal having a signal level associated with the current power level of the transmission signal. In this manner, the transceiver can internally detect the current power level of the transmission signal and accurately adjust the current power level based on transmission power control (TPC) information received from the base station.
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Citations
20 Claims
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1. A transceiver, comprising:
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a transmitter circuit operable to up convert a first transmission signal into a first physical uplink channel, the transmitter circuit having; a transmission amplification circuit having a first adjustable gain and a maximum power level that is providable by the first adjustable gain of the transmission amplification circuit, wherein the transmission amplification circuit is operable to amplify the first transmission signal in accordance with the first adjustable gain; and a coupler connected to generate a transmit feedback signal having a signal level associated with a current power level of the first transmission signal; an antenna tuner having an impedance response, wherein the antenna tuner is coupled to receive the first transmission signal from the transmission amplification circuit; a receiver circuit operable to down convert a first receive signal out of a first physical downlink channel, wherein the first receive signal includes transmission power control information for adjusting the current power level of the first transmission signal to a first desired power level; and a power control system operably associated with the transmitter circuit wherein the power control system is configured to; adjust the first adjustable gain of the transmission amplification circuit based on the signal level of the transmit feedback signal and the transmission power control information so as to reduce a difference between the current power level of the first transmission signal and the first desired power level; and adjust the impedance response of the antenna tuner to reduce the difference between the current power level of the first transmission signal and the first desired power level when the maximum power level that is providable by the first adjustable gain is reached by the transmission amplification circuit and when the first desired power level is above the maximum power level of the transmission amplification circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of controlling transmission power in a mobile user device communicating with a base station, comprising:
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generating, at the mobile user device, a first transmission signal; up converting, at the mobile user device, the first transmission signal into a first physical uplink channel utilizing a transmitter circuit; amplifying the first transmission signal in accordance with a first adjustable gain by the transmitter circuit; receiving, from the base station and at the mobile user device, transmission power control information for adjusting a current power level of the first transmission signal to a first desired power level; transmitting, from the mobile user device and to the base station, the first transmission signal after the up converting of the first transmission signal into the first physical uplink channel; detecting, at the mobile user device, a signal level of the first transmission signal within the transmitter circuit wherein the signal level is associated with the current power level of the first transmission signal; adjusting the first adjustable gain to reduce a difference between the current power level and the first desired power level of the first transmission signal; and adjusting an impedance response of an antenna tuner to reduce the difference between the current power level and the first desired power level of the first transmission signal when the maximum power level that is providable by the first adjustable gain is reached by a transmission amplification circuit and when the first desired power level is above the maximum power level of the transmission amplification circuit. - View Dependent Claims (17, 18, 19)
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20. A non-transitory computer readable medium that stores computer-executable instructions for implementing a method in a mobile user device, wherein the method comprises:
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extracting transmission power control information from a first receive signal, wherein the transmission power control information is for adjusting a first transmission signal to a first desired power level; receiving a transmit feedback signal from a transmitter circuit, wherein the transmitter circuit is operable to up convert a transmission signal into a first physical uplink channel, the transmit feedback signal having a signal level associated with a current power level of the first transmission signal; determining a difference between the current power level of the first transmission signal and the first desired power level based on the signal level of the transmit feedback signal and the transmission power control information; adjusting a first adjustable gain in a transmission amplification circuit within the transmitter circuit based on the difference between the current power level of the first transmission signal and the first desired power level; and adjusting an impedance response of an antenna tuner to reduce the difference between the current power level of the first transmission signal and the first desired power level when a maximum power level that is providable by the first adjustable gain is reached by the transmission amplification circuit and when the first desired power level is above the maximum power level of the transmission amplification circuit.
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Specification