Method of transmitting channel quality indicator
AssigneeLG Electronics Inc.
InventorsJin Young Chun, Bin Chul Ihm, Wook Bong Lee, Moon Il Lee, Hyun Soo Ko
Life of this patent
Estimating the term…
Abstract
A method of transmitting channel quality indicator (CQI) includes obtaining CQI of each, of the plurality of sub-bands, selecting a first sub-band having the best CQI of the plurality of sub-bands, transmitting the best CQI of the first sub-band at a first transmission cycle and transmitting a difference value between the best CQI of the first sub-band and a CQI of the first sub-band at a second transmission cycle. Signalling overhead due to CQI transmission can be reduced.
Claims5
A method of transmitting a channel quality indicator (CQI) in a wireless communication system, the method comprising:
- transmitting a request for approving a CQI transmission scheme to a base station;
- receiving an approving signal for the request;
- generating CQIs according to the CQI transmission scheme;
- and
- transmitting the generated CQI to the base station;
- wherein the CQI transmission scheme comprises:
- obtaining a CQI of each of N sub-bands at a first transmission cycle;
- selecting a first sub-band having the best CQI and M−1 sub-bands having CQIs lower than the best CQI in the N sub-bands at the first transmission cycle;
- transmitting the best CQI of the first sub-band and difference values between the best CQI and the CQI of each of the M−1 sub-bands at the first transmission cycle;
- and
- transmitting only a difference value between the best CQI of the first sub-band and a CQI of the first sub-band at a second transmission cycle;
- wherein the CQI of each of the M−1 sub-bands at the second transmission cycle are determined by using the difference value between the best CQI of the first sub-band and the CQI of the first sub-band at the second transmission cycle.
An apparatus of transmitting a channel quality indicator (CQI) in a wireless communication system, the apparatus comprising:
- a receiver;
- a transmitter;
- and a controller, coupled to the receiver and the transmitter, and configured to:
- transmit a request for approving a CQI transmission scheme to a base station;
- transmit an approving signal for the request;
- generate CQIs according to the CQI transmission scheme;
- and
- transmit the generated CQI to the base station;
- wherein the CQI transmission scheme comprises:
- obtaining a CQI of each of N sub-bands at a first transmission cycle;
- selecting a first sub-band having the best CQI and M−1 sub-bands having CQIs lower than the best CQI in the N sub-bands at the first transmission cycle;
- transmitting the best CQI of the first sub-band and difference values between the best CQI and the CQI of each of the M−1 sub-bands at the first transmission cycle;
- and
- transmitting only a difference value between the best CQI of the first sub-band and a CQI of the first sub-band at a second transmission cycle,
- wherein the CQI of each of the M−1 sub-bands at the second transmission cycle are determined by using the difference value between the best CQI of the first sub-band and the CQI of the first sub-band at the second transmission cycle.
Dependencies are inferred from the claim text.