# US 8,787,837 B2 · Radio communication device and radio communication method configured for channel quality reporting of selected sub-carrier bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,837 B2 - Document ID: US8787837B2 - Status: Granted - Kind: B2 - Application number: 10/566,732 - Filed: 2004-08-04 - Published: 2006-09-07 - Granted: 2014-07-22 - Earliest claimed: 2003-08-06 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Akihiko Nishio; Jun Cheng - Inventors: Akihiko Nishio; Jun Cheng - Web page: https://patentgrep.com/patent/US8787837B2 ## Abstract A wireless communication apparatus is provided including: a radio receiver configured to acquire, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting; a reception quality measurer configured to measure channel quality of each of a plurality of sub-carrier bands within a communication band; a subcarrier selector configured to select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number; a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands and a third information indicating positions of the selected sub-carrier bands according to a modulation scheme; and a radio transmitter configured to report to the base station the second and third modulated information. ## Claims ### Claim 1 A wireless communication apparatus comprising: a radio receiver configured to acquire, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting; a reception quality measurer coupled to the radio receiver and configured to measure channel quality of each of a plurality of sub-carrier bands within a communication band from a received signal; a subcarrier selector coupled to the radio receiver and configured to select sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number indicated by the first acquired information; a modulator configured to modulate a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating positions of the selected sub-carrier bands according to the modulation scheme; and a radio transmitter configured to report to the base station the second and third modulated information. ### Claim 2 (depends on 1) The wireless communication apparatus according to claim 1, wherein the subcarrier selector is configured to select the indicated fixed number of sub-carrier bands in descending order of the measured channel quality. ### Claim 3 (depends on 1) The wireless communication apparatus according to claim 1, wherein the radio transmitter is further configured to spread the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, and report the spread second information. ### Claim 4 (depends on 1) The wireless communication apparatus according to claim 1, wherein the radio transmitter is further configured to spread the third information indicating positions of the selected sub-carrier bands using a spreading code specific to each user, and report the spread third information. ### Claim 5 (depends on 1) The wireless communication apparatus according to claim 1, wherein the second information indicating channel quality of the selected sub-carrier bands is channel quality information (CQI). ### Claim 6 (depends on 5) The wireless communication apparatus according to claim 5, wherein the CQI is generated based on comparison between a channel quality measurement value and predetermined regions of channel quality measurement values respectively indicating different CQIs. ### Claim 7 (depends on 1) The wireless communication apparatus according to claim 1, wherein the second information indicates an aggregation of the channel quality of each of the selected sub-carrier bands. ### Claim 8 (depends on 1) The wireless communication apparatus according to claim 1, wherein the radio transmitter is further configured to multiplex the second and third modulated information with an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal for reporting to the base station. ### Claim 9 A wireless communication method comprising: acquiring, from a base station, a first information indicating a fixed number identifying quantity of sub-carrier bands to be selected for channel quality reporting; measuring channel quality of each of a plurality of sub-carrier bands within a communication band from a received signal; selecting sub-carrier bands from the plurality of sub-carrier bands based on the measured channel quality, wherein quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands identified by the fixed number indicated by the first acquired information; modulating a second information indicating channel quality of the selected sub-carrier bands according to a modulation scheme and a third information indicating positions of the selected sub-carrier bands according to the modulation scheme; and reporting to the base station the second and third modulated information. ### Claim 10 (depends on 9) The wireless communication method according to claim 9, wherein the selecting selects the indicated fixed number of sub-carrier bands in descending order of the measured channel quality. ### Claim 11 (depends on 9) The wireless communication method according to claim 9, further comprising spreading the second information indicating channel quality of the selected sub-carrier bands using a spreading code specific to each user, wherein the reporting includes reporting of the spread second information. ### Claim 12 (depends on 9) The wireless communication method according to claim 9, further comprising spreading the third information indicating positions of the selected sub-carrier bands using a spreading code specific to each user, wherein the reporting includes reporting of the spread third information. ### Claim 13 (depends on 9) The wireless communication method according to claim 9, wherein the second information indicating channel quality of the selected sub-carrier bands is channel quality information (CQI). ### Claim 14 (depends on 13) The wireless communication method according to claim 13, wherein the CQI is generated based on comparison between a channel quality measurement value and predetermined regions of channel quality measurement values respectively indicating different CQIs. ### Claim 15 (depends on 9) The wireless communication method according to claim 9, wherein the second information indicates an aggregation of the channel quality of each of the selected sub-carrier bands. ### Claim 16 (depends on 9) The wireless communication method according to claim 9, further comprising multiplexing the second and third modulated information with an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal before reporting to the base station.