Method and apparatus for uplink transmit power adjustment
First Claim
1. A method for transmit power adjustment in a user equipment of a wireless communications system, the method comprising:
- performing uplink transmission by means of beamforming, such that simultaneous uplink transmission from a plurality of antennas of the user equipment is carried out, andperforming a first transmit power adjustment phase, comprising;
decreasing the transmit power of a selected antenna by a selected decrease amount during a first measurement period, wherein the transmit power of the selected antenna prior to the decrease was lower than or equal to the transmit power of another antenna of the plurality of antennas;
analyzing a plurality of transmit power control (TPC) commands corresponding to the first measurement period to determine a result of the decreased transmit power of the selected antenna as indicated by a change in received power at a base station;
completing the first transmit power adjustment phase by selectively (i) resuming the transmit power of the selected antenna prior to the decrease if the result of the decreased transmit power is above or equal to a decrease threshold value or (ii) continuing the uplink transmission with the decreased transmit power of the selected antenna if the result of the decreased transmit power indicates a change in received power at the base station that is below the decrease threshold value.
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Accused Products
Abstract
The present invention relates to a method and a user equipment for use in a wireless communication system. The method and user equipment allow for transmit power adjustment of the transmit power of a selected of a plurality of antennas of the user equipment. The method comprised a transmit power adjustment phase during which it is test (23) is performed to decrease the transmit power of the selected antenna. A number of TPC commands are then analyzed (24) to determine a result of the decreased transmit power indicating a change in received power at a base station. Based on the determined result it is decided to continue (27) with the decreased transmit power or to resume (26) the previous transmit power of the selected antenna after completion of the transmit power adjustment phase.
219 Citations
22 Claims
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1. A method for transmit power adjustment in a user equipment of a wireless communications system, the method comprising:
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performing uplink transmission by means of beamforming, such that simultaneous uplink transmission from a plurality of antennas of the user equipment is carried out, and performing a first transmit power adjustment phase, comprising; decreasing the transmit power of a selected antenna by a selected decrease amount during a first measurement period, wherein the transmit power of the selected antenna prior to the decrease was lower than or equal to the transmit power of another antenna of the plurality of antennas; analyzing a plurality of transmit power control (TPC) commands corresponding to the first measurement period to determine a result of the decreased transmit power of the selected antenna as indicated by a change in received power at a base station; completing the first transmit power adjustment phase by selectively (i) resuming the transmit power of the selected antenna prior to the decrease if the result of the decreased transmit power is above or equal to a decrease threshold value or (ii) continuing the uplink transmission with the decreased transmit power of the selected antenna if the result of the decreased transmit power indicates a change in received power at the base station that is below the decrease threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A user equipment for use in a wireless communication system, the user equipment comprising a plurality of antennas adapted for simultaneous uplink transmission and transmit power control circuits configured to control the transmit power of the plurality of antennas, wherein the transmit power control circuits are configured to perform a first transmit power adjustment phase that comprises:
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decreasing the transmit power of a selected antenna by a selected decrease amount during a first measurement period, wherein the transmit power of the selected antenna prior to the decrease was lower than or equal to the transmit power of another antenna of the plurality of antennas; analyzing a plurality of transmit power control (TPC) commands corresponding to the first measurement period to determine a result of the decreased transmit power of the selected antenna as indicated by a change in received power at a base station; completing the first transmit power adjustment phase by selectively (i) resuming the transmit power of the selected antenna prior to the decrease if the result of the decreased transmit power is above or equal to a decrease threshold value or (ii) continuing the uplink transmission with the decreased transmit power of the selected antenna if the result of the decreased transmit power indicates a change in received power at the base station that is below the decrease threshold value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification