Method and apparatus for transmission power control
First Claim
1. A method of power control for a transmitter in a cellular communication system comprising the steps of:
- determining power control data in response to a quality parameter of a communication between a base station and a communication unit;
communicating the power control data between the base station and the communication unit;
determining that a transmit power of the transmitter exceeds a threshold;
determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold;
in response to determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold, entering a reduced power mode of operation by communicating power down power control data between the base station and the communication unit;
operating in the reduced power mode by communicating power control data corresponding to a reduced transmit power level that allows communication at a reduced data rate between the communication unit and the base station; and
exiting the reduced power mode when a quality characteristic of a data communication between the communication unit and the base station is improving by communicating power up power control data between the base station and the communication unit.
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Accused Products
Abstract
The invention relates to a system for power control in a cellular communication system. The power control may be operated (201) in a first mode of operation wherein power control data are determined in response to a quality parameter, such as a desired signal to noise ratio. The method further comprises entering (205) a reduced power mode of operation by communicating power down power control data between a base station and a communication unit. The base station and/or communication unit then proceeds to operate (207) in the reduced power mode by communicating power control data corresponding to a reduced transmit power level. The reduced transmit power level may specifically be zero. After a given duration, the base station and/or communication unit proceeds to exit (211) the reduced power mode by communicating power up power control data between the base station and the communication unit.
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Citations
17 Claims
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1. A method of power control for a transmitter in a cellular communication system comprising the steps of:
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determining power control data in response to a quality parameter of a communication between a base station and a communication unit; communicating the power control data between the base station and the communication unit; determining that a transmit power of the transmitter exceeds a threshold; determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold; in response to determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold, entering a reduced power mode of operation by communicating power down power control data between the base station and the communication unit; operating in the reduced power mode by communicating power control data corresponding to a reduced transmit power level that allows communication at a reduced data rate between the communication unit and the base station; and exiting the reduced power mode when a quality characteristic of a data communication between the communication unit and the base station is improving by communicating power up power control data between the base station and the communication unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for power control for a transmitter in a cellular communication system, the apparatus comprising:
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means for determining power control data in response to a quality parameter of a communication between a base station and a communication unit; means for communicating the power control data between the base station and the communication unit; means for determining that a transmit power of the transmitter exceeds a threshold; means for determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold; means for entering a reduced power mode of operation by communicating power down power control data between the base station and the communication unit, in response to the determining that a quality level of the communication between the communication unit and the base station cannot be achieved when the transmit power of the transmitter exceeds the threshold; means for operating in the reduced power mode by communicating power control data corresponding to a reduced transmit power level that allows communication at a reduced data rate between the communication unit and the base station; and means for exiting the reduced power mode when a quality characteristic of a data communication between the communication unit and the base station is improving by communicating power up power control data between the base station and the communication unit.
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Specification