Channel state information feedback method for multi-carrier communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsNak-Myeong Kim, Hee-Jung Suh
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Abstract
In a multi-carrier communication system where a base station performs resource allocating power allocation and adaptive modulation processes for a mobile station by using CSI (Channel State Information) received from the mobile station, a CSI feedback method in accordance with the present invention determines a CSI transmission mode according to an amount of data traffic on a reverse link, encodes CSI for subcarriers into one CSI codeword according to the determined CSI transmission mode, and transmits the CSI codeword to the base station. Since the CSI is adaptively transmitted according to the amount of the data traffic of the reverse link, it can effectively use resources of the reverse link.
Claims36
In a multi-carrier communication system where a base station (BS) performs a resource power allocation and an adaptive modulation processes for a mobile station (MS) by using Channel State Information (CSI) received from the mobile station, a CSI feedback method comprising the steps of:
- determining a CSI transmission mode according to an amount of data traffic on a reverse link;
- encoding CSI for a plurality of subcarriers into one CSI codeword according to the determined CSI transmission mode;
- and
- transmitting the CSI codeword to the base station.
The CSI feedback method of Claim. 3, wherein the CSI classification distinguishability increases in order of the first rough mode, the second rough mode, the first fine mode, and the second fine mode, respectively.
In a multi-carrier communication system including a plurality of subcarriers where a base station performs resource allocation and transmission power control processes for a mobile station by using feedback information received from the mobile station, a CSI (Channel State Information)feedback method comprises the steps of:
- measuring SINRs(Signal-to-Interference and Noise Ratios) for each subcarrier;
- allocating identical CSI(Channel State Information) to subcarriers having identical SINRs;
- grouping the subcarriers allocated with the identical CSI;
- encoding the CSI into one CSI codeword in consideration of the subcarrier groups;
- and transmitting the CSI codeword to the base station.
In a multi-carrier communication system where a base station performs resource allocation and transmission power control processes for a mobile station by using CSI (Channel State Information) received from the mobile station, a CSI feedback method comprises the steps of:
- determining a CSI transmission mode;
- classifying CSI for subcarriers according to the CSI transmission mode;
- measuring SINRs for each subcarrier;
- deciding CSI of the corresponding subcarriers by comparing the measured SINRs of each subcarrier with a threshold SINR value;
- binding contiguous subcarriers in a frequency area into CSI groups among subcarriers determined to have identical CSI;
- encoding the CSI for all the subcarriers into one CSI codeword in consideration of the CSI groups;
- and
- transmitting the CSI codeword to the base station.
Dependencies are inferred from the claim text.