Channel quality indicator for OFDM
First Claim
1. A method comprising:
- a) receiving from a mobile terminal an indicator of a degree to which a channel response varies across sub-carriers over an orthogonal frequency division multiplexing frequency band;
b) receiving from the mobile terminal an indicator of a carrier-to-interference ratio associated with the mobile terminal;
c) determining a channel quality indicator based on both the indicator of the degree to which the channel response varies and the indicator of the carrier-to-interference ratio; and
d) controlling transmission of information to the mobile terminal based on the channel quality indicator.
3 Assignments
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Accused Products
Abstract
The present invention provides an improved channel quality indicator indicia for OFDM communication environments. In addition to taking into consideration carrier-to-interference ratios, the present invention also takes into consideration the degree to which the channel response varies among the sub-carriers throughout the OFDM frequency band. The carrier-to-interference ratio and the degree of channel response variation are directly or indirectly used by a base station to select coding and modulation schemes for transmissions from the base station to the mobile terminal reporting these factors. Further, scheduling of data sent to the mobile terminal and other mobile terminals competing for the same channel resources may also be based in part on the carrier-to-interference ratio and the degree to which the channel response varies.
56 Citations
47 Claims
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1. A method comprising:
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a) receiving from a mobile terminal an indicator of a degree to which a channel response varies across sub-carriers over an orthogonal frequency division multiplexing frequency band; b) receiving from the mobile terminal an indicator of a carrier-to-interference ratio associated with the mobile terminal; c) determining a channel quality indicator based on both the indicator of the degree to which the channel response varies and the indicator of the carrier-to-interference ratio; and d) controlling transmission of information to the mobile terminal based on the channel quality indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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a) monitoring channel conditions associated with a transmission received from a base station; b) determining a carrier-to-interference ratio associated with the transmission received from the base station; c) determining a channel quality indicator based on the channel conditions, the channel quality indicator bearing both on a degree to which a channel response varies across sub-carriers over an orthogonal frequency division multiplexing frequency band and on the carrier-to-interference ratio; and d) transmitting the channel quality indicator to the base station for controlling transmission of information from the base station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system comprising:
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a) receive circuitry adapted to receive from a mobile terminal a channel quality indicator bearing both on a degree to which a channel response varies across sub-carriers over an orthogonal frequency division multiplexing frequency band and on a carrier-to-interference ratio associated with the mobile terminal; and b) control circuitry associated with the receive circuitry and adapted to control transmission of information to the mobile terminal based on the channel quality indicator. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A system comprising:
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a) receive circuitry adapted to monitor channel conditions associated with a transmission received from a base station; b) a control system associated with the receive circuitry and adapted to; i) determine a carrier-to-interference ratio associated with the transmissions received from the base station; and ii) determine a channel quality indicator based on the channel conditions, the channel quality indicator bearing both on a degree to which a channel response varies across sub-carriers over an orthogonal frequency division multiplexing frequency band and on the carrier-to-interference ratio; and c) transmission circuitry associated with the control system and adapted to transmit the channel quality indicator to the base station for controlling transmission of information from the base station. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification