Jointly controlling transmission rate and power in a communications system
First Claim
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1. A method for jointly controlling the data rate and power level of data transmission across a communication channel, comprising:
- providing an ordered list of a plurality of transmit parameter pairs that each include information indicative of a data rate and information indicative of a power level, wherein ordering the list comprising;
ordering the data rate for a first group of the transmit parameter pairs from lowest to highest, the data rate for each of the transmit parameter pairs of the first group paired with a common maximum power level;
ordering the power level for a second group of the transmit parameter pairs from highest to lowest, the power level for each of the transmit parameter pairs of the second group paired with a common maximum data rate;
transmitting at the data rate and power level indicated by a selected one of the transmit parameter pairs; and
sequentially selecting different ones of the transmit parameter pairs to be the selected transmit parameter pair, including determining which of the transmit parameter pairs will be the next selected transmit parameter pair based on the currently selected transmit parameter pair and a communication quality condition associated with the communication channel.
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Abstract
The present invention jointly controls rate and power in a fashion that enables control of the two variables in one dimension. In some embodiments, this is done by ordering the possible transmit rate (320) and transmit power (340) combinations in a logical sequence that meets specific conditions. The present invention can first minimize the transmit time and then reduce the transmit power. The present invention can maintain the maximum rate possible that enables the receiving station to decode packets with an acceptable probability.
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Citations
17 Claims
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1. A method for jointly controlling the data rate and power level of data transmission across a communication channel, comprising:
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providing an ordered list of a plurality of transmit parameter pairs that each include information indicative of a data rate and information indicative of a power level, wherein ordering the list comprising; ordering the data rate for a first group of the transmit parameter pairs from lowest to highest, the data rate for each of the transmit parameter pairs of the first group paired with a common maximum power level; ordering the power level for a second group of the transmit parameter pairs from highest to lowest, the power level for each of the transmit parameter pairs of the second group paired with a common maximum data rate; transmitting at the data rate and power level indicated by a selected one of the transmit parameter pairs; and sequentially selecting different ones of the transmit parameter pairs to be the selected transmit parameter pair, including determining which of the transmit parameter pairs will be the next selected transmit parameter pair based on the currently selected transmit parameter pair and a communication quality condition associated with the communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for jointly controlling the data rate and power level of data transmission across a communication channel, comprising:
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a storage portion for storing an ordered list of a plurality of transmit parameter pairs that each include information indicative of a data rate and information indicative of a power level, said storage portion having an output for outputting a selected one of the transmit parameter pairs, wherein the ordered list orders the data rate for a first group of the transmit parameter pairs from lowest to highest, the data rate for each of the transmit parameter pairs of the first group paired with a common maximum power level and wherein the ordered list further orders the power level for a second group of the transmit parameter pairs from highest to lowest, the power level for each of the transmit parameter pairs of the second group paired with a common maximum data rate; a communication interface coupled to said storage portion output for transmitting at the data rate and power level indicated by the selected transmit parameter pair; and a controller coupled to said storage portion for sequentially selecting different ones of the transmit parameter pairs to be the selected transmit parameter pair that is output from said storage portion, said controller including an input for receiving information indicative of a communication quality condition associated with the communication channel, and said controller operable for determining which of the transmit parameter pairs will be the next selected transmit parameter pair based on the communication quality condition and the currently selected transmit parameter pair. - View Dependent Claims (13, 14, 15, 16)
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17. A communication system, comprising:
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a transmitter for transmitting data on a communication channel; a receiver for receiving via said communication channel the data transmitted by said transmitter; and said transmitter including an apparatus for jointly controlling the data rate and power level at which the data is transmitted on the communication channel, including a storage portion for storing an ordered list of a plurality of transmit parameter pairs that each include information indicative of a data rate and information indicative of a power level, said storage portion having an output for outputting a selected one of the transmit parameter pairs, a communication interface coupled to said storage portion output for transmitting at the data rate and power level indicated by the selected transmit parameter pair, and a controller coupled to said storage portion for sequentially selecting different ones of the transmit parameter pairs to be the selected transmit parameter pair that is output from said storage portion, said controller including an input for receiving information indicative of a communication quality condition associated with the communication channel, and said controller operable for determining which of the transmit parameter pairs will be the next selected transmit parameter pair based on the communication quality condition and the currently selected transmit parameter pair, wherein the ordered list orders the data rate for a first group of the transmit parameter pairs from lowest to highest, the data rate for each of the transmit parameter pairs of the first group paired with a common maximum power level and wherein the ordered list further orders the power level for a second group of the transmit parameter pairs from highest to lowest, the power level for each of the transmit parameter pairs of the second group paired with a common maximum data rate.
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Specification