Reliability detection of channel quality indicator (CQI) and application to outer loop power control
AssigneeInterDigital Technology Corporation
InventorsMarian Rudolf, Stephen G. Dick, James M. Miller
Life of this patent
Estimating the term…
Abstract
A method for improving the reliability of a channel quality indicator (CQI) message in a wireless communications network begins with receipt of the CQI message. The CQI message is then decoded, and a decision metric value for each symbol in the CQI message is computed. A largest decision metric value and a second largest decision metric value for the CQI message are determined. The reliability of the CQI message can be determined by comparing the two largest decision metric values. This method may be applicable to high-speed downlink packet access in time division duplex, frequency division duplex, or other modes of transmission.
Claims36
A method for improving the reliability of a channel quality indicator (CQI) message in a wireless communications network, comprising the steps of:
- a) receiving the CQI message;
- b) decoding the CQI message;
- c) computing a decision metric value for each symbol in the CQI message;
- d) determining a largest decision metric value;
- e) determining a second largest decision metric value;
- and
- f) determining the reliability of the CQI message by comparing the values obtained in steps (d) and (e).
A method for improving the reliability of a received message representing quality of a transmission channel in a wireless communication system, comprising the steps of:
- a) receiving a channel quality indicator (CQI) message from a wireless transmit and receive unit (WTRU);
- b) decoding the CQI message;
- c) obtaining at least two different values representative of the decoded CQI message;
- and
- d) comparing the at least two values to determine the reliability of the CQI message.
A system for determining the quality of a transmission channel in a wireless communication system, comprising:
- at least one wireless transmit and receive unit, including generating means for generating a channel quality indicator (CQI);
- a base station, comprising:
- receiving means for receiving the CQI;
- decoding means for decoding the CQI;
- computing means for computing a first decision metric and a second decision metric of the decoded CQI;
- and
- comparing means for comparing the first and second decision metrics to determine if the CQI contains an error.
A base station for determining the quality of a transmission channel in a wireless communication system, the system including at least one wireless transmit and receive unit having generating means for generating a channel quality indicator (CQI), said base station comprising:
- receiving means for receiving the CQI;
- decoding means for decoding the CQI;
- computing means for computing a first decision metric and a second decision metric of the decoded CQI;
- and
- comparing means for comparing the first and second decision metrics to determine if the CQI contains an error.
An integrated circuit, comprising:
- an input configured to receive a channel quality indicator (CQI) message;
- decoding means for decoding the CQI message;
- computing means for computing a first decision metric and a second decision metric of the decoded CQI message;
- and
- comparing means for comparing the first and second decision metrics to determine if the CQI message contains an error.
An integrated circuit, comprising:
- an input configured to receive a channel quality indicator (CQI) message;
- a Reed-Muller decoder for decoding the CQI message;
- a compute decision metric device for computing a first decision metric and a second decision metric of the decoded CQI message;
- and
- a compare decision metric device for comparing the first and second decision metrics to determine if the CQI message contains an error.
Dependencies are inferred from the claim text.