Uplink power control algorithm
First Claim
1. A method for determining an uplink transmit power level at which to transmit a current data block over a radio link from at least one of a plurality of mobile stations to a base transmitter station, comprising:
- (a) evaluating airlink quality measurements within the radio link over a measurement interval, wherein each time a message is sent to the mobile station, it is evaluated whether a specified number of uplink blocks have been transmitted by the mobile station since the start of the measurement interval; and
(b) determining a transmit power level that the mobile should be using for the current block based on the evaluated airlink quality measurement, wherein transmit power is adjusted for the current block, if necessary, based on the determined transmit power.
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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, there is a method for determining an uplink transmit power level at which to transmit a current data block over a radio link from the mobile to the base transmitter station. The method evaluates airlink quality measurements in the radio link over a measurement interval, wherein each time a message is sent to the mobile station, it is evaluated whether a specified number of uplink blocks have transmitted by the mobile station since the start of the measurement interval. Based on the evaluated airlink quality measurement, the method determines the uplink transmit power level that the mobile should be using for the current block, and adjusts the transmit power level, if necessary, for the current block.
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Citations
32 Claims
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1. A method for determining an uplink transmit power level at which to transmit a current data block over a radio link from at least one of a plurality of mobile stations to a base transmitter station, comprising:
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(a) evaluating airlink quality measurements within the radio link over a measurement interval, wherein each time a message is sent to the mobile station, it is evaluated whether a specified number of uplink blocks have been transmitted by the mobile station since the start of the measurement interval; and
(b) determining a transmit power level that the mobile should be using for the current block based on the evaluated airlink quality measurement, wherein transmit power is adjusted for the current block, if necessary, based on the determined transmit power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A base transmitter station in a general packet radio system (GPRS), comprising:
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a transceiver for transmitting and receiving data packets to and from a plurality of mobile stations; and
a processor which determines the uplink transmit power to be used by at least one mobile station before transmitting its uplink block to the base transmitter station. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. In a general packet radio system (GPRS), a closed-loop power control method requiring interaction between a first algorithm and a second algorithm,
wherein the first algorithm informs the second algorithm about a weakest coding scheme that is to be used over an airlink, in a next measurement interval, between at least one target mobile station and a base station of the system, and wherein the second algorithm selects target mobile bit error rate (BER) or target mobile carrier-to-interference level (C/I) based on the information from the first algorithm, and sets a flag for when attenuation to be used in said next measurement interval exceeds a preset threshold.
Specification