Open-loop rate control for a TDD communication system
First Claim
1. An apparatus comprising:
- a processor operative to estimate channel quality of a first communication link based on a transmission received via the first communication link; and
a controller operative to estimate channel quality of a second communication link based on the estimated channel quality of the first communication link and an asymmetric parameter, wherein the asymmetric parameter is indicative of a difference in channel qualities of the first and second communication links.
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Abstract
Techniques for performing open-loop rate control in a TDD communication system are described. The channel quality of a first link is estimated based on a transmission received via the first link. The channel quality of a second link is estimated based on the estimated channel quality of the first link and an asymmetric parameter. At least one rate for a data transmission via the second link is selected based on the estimated channel quality of the second link. The estimated channel quality for each link may be given by a set of SNR estimates for a set of transmission channels on that link. The asymmetric parameter may be determined based on (1) the capabilities (e.g., transmit power, receiver noise figure, and number of antennas) of the transmitting and receiving stations or (2) received SNRs for the first and second links.
75 Citations
67 Claims
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1. An apparatus comprising:
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a processor operative to estimate channel quality of a first communication link based on a transmission received via the first communication link; and
a controller operative to estimate channel quality of a second communication link based on the estimated channel quality of the first communication link and an asymmetric parameter, wherein the asymmetric parameter is indicative of a difference in channel qualities of the first and second communication links. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of performing rate selection, comprising:
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estimating channel quality of a first communication link based on a transmission received via the first communication link;
estimating channel quality of a second communication link based on the estimated channel quality of the first communication link and an asymmetric parameter indicative of a difference in channel qualities of the first and second communication links; and
selecting at least one rate for a data transmission via the second communication link based on the estimated channel quality of the second communication link. - View Dependent Claims (18, 19, 20, 21, 22)
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23. An apparatus comprising:
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means for estimating channel quality of a first communication link based on a transmission received via the first communication link; and
means for estimating channel quality of a second communication link based on the estimated channel quality of the first communication link and an asymmetric parameter indicative of a difference in channel qualities of the first and second communication links. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. An apparatus comprising:
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a processor operative to derive a first plurality of signal-to-noise-and-interference ratio (SNR) estimates for a first plurality of transmission channels on a first communication link based on a transmission received via the first communication link; and
a controller operative to derive a second plurality of SNR estimates for a second plurality of transmission channels on a second communication link based on the first plurality of SNR estimates and an asymmetric parameter and to select a plurality of rates for the second plurality of transmission channels based on the second plurality of SNR estimates. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A method comprising:
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deriving a first plurality of signal-to-noise-and-interference ratio (SNR) estimates for a first plurality of transmission channels on a first communication link based on a transmission received via the first communication link;
deriving a second plurality of SNR estimates for a second plurality of transmission channels on a second communication link based on the first plurality of SNR estimates and an asymmetric parameter; and
selecting a plurality of rates for the second plurality of transmission channels based on the second plurality of SNR estimates. - View Dependent Claims (38, 39)
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40. An apparatus comprising:
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means for deriving a first plurality of signal-to-noise-and-interference ratio (SNR) estimates for a first plurality of transmission channels on a first communication link based on a transmission received via the first communication link;
means for deriving a second plurality of SNR estimates for a second plurality of transmission channels on a second communication link based on the first plurality of SNR estimates and an asymmetric parameter; and
means for selecting a plurality of rates for the second plurality of transmission channels based on the second plurality of SNR estimates. - View Dependent Claims (41, 42, 43)
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44. An apparatus comprising:
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a processor operative to derive at least one signal-to-noise-and-interference ratio (SNR) estimate for a first communication link based on a transmission received via the first communication link; and
a controller operative to derive at least one SNR estimate for a second communication link based on the at least one SNR estimate for the first communication link, to enable at least one data stream, to select at least one rate for the at least one data stream based on the at least one SNR estimate for the second communication link, and to adjust transmission of the at least one data stream based on feedback received for packets in the at least one data stream. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52)
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53. A method of transmitting data, comprising:
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deriving at least one signal-to-noise-and-interference ratio (SNR) estimate for a first communication link based on a transmission received via the first communication link;
deriving at least one SNR estimate for a second communication link based on the at least one SNR estimate for the first communication link;
enabling at least one data stream;
selecting at least one rate for the at least one data stream based on the at least one SNR estimate for the second communication link; and
adjusting transmission of the at least one data stream based on feedback received for packets in the at least one data stream. - View Dependent Claims (54, 55, 56, 57)
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58. An apparatus comprising:
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means for deriving at least one signal-to-noise-and-interference ratio (SNR) estimate for a first communication link based on a transmission received via the first communication link;
means for deriving at least one SNR estimate for a second communication link based on the at least one SNR estimate for the first communication link;
means for enabling at least one data stream;
means for selecting at least one rate for the at least one data stream based on the at least one SNR estimate for the second communication link; and
means for adjusting transmission of the at least one data stream based on feedback received for packets in the at least one data stream. - View Dependent Claims (59)
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60. An apparatus comprising:
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a first processor operative to determine received signal-to-noise-and-interference ratios (SNRs) for a first plurality of subbands of a first transmission channel on a first communication link based on a pilot transmission received via the first communication link;
a controller operative to select at least one subband among a second plurality of subbands of a second transmission channel on a second communication link based on the received SNRs for the first transmission channel; and
a second processor operative to process data for transmission on the at least one subband of the second transmission channel. - View Dependent Claims (61, 62, 63, 64)
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65. A method of transmitting data, comprising:
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determining received signal-to-noise-and-interference ratios (SNRs) for a first plurality of subbands of a first transmission channel on a first communication link based on a pilot transmission received via the first communication link;
selecting at least one subband among a second plurality of subbands of a second transmission channel on a second communication link based on the received SNRs for the first transmission channel; and
processing data for transmission on the at least one subband of the second transmission channel. - View Dependent Claims (66, 67)
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Specification