Channel quality information reporting for subframes
AssigneeSun Patent Trust
InventorsAlexander Golitschek Edler von Elbwart, Masayuki Hoshino
Life of this patent
Estimating the term…
Abstract
The present invention relates to reporting the channel state information in a communication system. The channel state information is reported from the user terminal to a base station. Accordingly, the user terminal determines a first channel state information value from a first set of values (levels) and a second channel state information value from another set of values, preferably a larger set of values. Then a difference or other relative measure is calculated between the first and the second channel state information value and transmitted to the base station.
Claims18
An integrated circuit which, in operation, controls a process of a user equipment for reporting channel state information (CSI) to a base station in a communication system, the process comprising:
- receiving data in subframes in a time domain from the base station, the subframes including a first set of subframes and a second set of subframes that differs from the first set of subframes wherein a higher spectral efficiency CSI reporting is configured for the second set of subframes than the first set of subframes;
- determining first CSI for the first set of subframes according to a first set of channel state values, the first set of channel state values configured for the first set of subframes;
- determining second CSI for the second set of subframes according to a second set of channel state values, the second set of channel state values configured for the second set of subframes and different from the first set of channel state values, wherein the first set of channel state values includes 16 index levels n (where n=0, 1, . . . 14, or 15) and the second set of channel state values includes the 16 index levels and, in a subset consisting of a defined number of highest index levels of the 16 index levels, the channel state value at index level n in the second set of channel state values has a higher spectral efficiency than the channel state value at index level n in the first set of channel state values;
- preparing a CSI report indicating at least one of the first CSI and the second CSI;
- and
- transmitting the CSI report.
An integrated circuit for controlling operation of a user equipment to report channel state information (CSI) to a base station, the integrated circuit comprising:
- reception circuitry, which, in operation, controls reception of data in subframes in a time domain from the base station, the subframes including a first set of subframes and a second set of subframes that differs from the first set of subframes wherein a higher spectral efficiency CSI reporting is configured for the second set of subframes than the first set of subframes;
- control circuitry, which is coupled to the reception circuitry and which, in operation,
- determines first CSI for the first set of subframes according to a first set of channel state values, the first set of channel state values configured for the first set of subframes,
- determines second CSI for the second set of subframes according to a second set of channel state values, the second set of channel state values configured for the second set of subframes and different from the first set of channel state values, wherein the first set of channel state values includes 16 index levels n (where n=0, 1, . . . 14, or 15) and the second set of channel state values includes the 16 index levels and, in a subset consisting of a defined number of highest index levels of the 16 index levels, the channel state value at index level n in the second set of channel state values has a higher spectral efficiency than the channel state value at index level n in the first set of channel state values, and
- prepares a CSI report indicating at least one of the first CSI and the second CSI;
- and
- transmission circuitry, which is coupled to the control circuitry and which, in operation, controls transmission of the CSI report to the base station.
Dependencies are inferred from the claim text.