Downlink power control method for wireless packet data network
AssigneeLucent Technologies Inc.
InventorsKenneth Budka, Kamala Murti, Arnab Das
Life of this patent
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Abstract
In a system having a base station transmitter for transmitting data blocks to one or more mobile stations over a radio link, a method for determining a transmit power level at which to transmit a current block. A quality measurement is received from a mobile station indicating an average radio link quality over a previous group of blocks, wherein not all of the blocks of the previous group of blocks were necessarily transmitted at the same transmit power level. A transmit power attenuation level is determined for the current block based on the quality measurement. The transmit power attenuation level is subtracted from the initial transmit power level to determine the transmit power level for the current block.
Claims25
In a system having a base station transmitter for transmitting data blocks to one or more mobile stations over a radio link, a method for determining a transmit power level at which to transmit a current block, comprising the steps of:
- (a) receiving a quality measurement from a mobile station indicating an average radio link quality over a given measurement interval for a previous group of blocks, wherein not all of the blocks of the previous group of blocks were necessarily transmitted at the same transmit power level;
- (b) determining a transmit power attenuation level for each current block of a subsequent group of blocks as a function of a minimum of a first attenuation factor and a second attenuation factor, based in part on the received quality measurement over the given measurement interval;
- and
- (c) for each current block of the subsequent group, subtracting the transmit power attenuation level from a given transmit power level used for transmitting one or more of the blocks of the previous group to determine the transmit power level for that current block.
A method for determining a transmit power level for each block of a group of blocks to be transmitted to a mobile station, comprising:
- calculating, based on measurements of a previous group of blocks reported by the mobile station over a given measurement interval, a first attenuation factor indicating a downlink attenuation level the mobile station can tolerate while still achieving an acceptable bit error rate;
- calculating a second attenuation factor indicating an estimated additional downlink attenuation to be applied to the first attenuation factor;
- and
- determining the transmit power attenuation level by taking the minimum of the first and second attenuation factors.
A method by which a base station determines a transmit power level for transmitting each block of a group of blocks in the downlink, comprising:
- receiving, from a mobile station, a measurement report for a previous group of blocks over a given measurement interval;
- calculating, for each current block of a subsequent group of blocks to be transmitted, compensations to be made to transmit power level for each current block as a function of a minimum of two attenuation levels;
- and
- transmitting each block based on the minimum of the two attenuation levels.
Dependencies are inferred from the claim text.