# US 10,122,491 B2 · Base station apparatus and radio communication method for receiving information indicative of channel quality from mobile station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,491 B2 - Document ID: US10122491B2 - Status: Granted - Kind: B2 - Application number: 15/613,794 - Filed: 2017-06-05 - Published: 2017-09-21 - Granted: 2018-11-06 - Earliest claimed: 2003-08-06 - Assignees: Optis Wireless Technology, LLC - Applicants: Optis Wireless Technology, LLC - Inventors: Akihiko Nishio; Jun Cheng - Web page: https://patentgrep.com/patent/US10122491B2 ## CPC - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/542: using measured or perceived quality - H04L 1/1671: {the supervisory signal being transmitted together with control information} - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A wireless communication method and apparatus are provided for selecting quality-reporting sub-carrier bands based on sub-carrier band quantity information received from a base station. The method includes generally four steps. First, from a base station, information indicating quantity of sub-carrier bands is acquired. Second, channel quality of each of a plurality of sub-carrier bands within a communication band is measured from a received signal. Third, sub-carrier bands are selected from the plurality of sub-carrier bands, wherein quantity of the selected sub-carrier bands corresponds to the quantity of sub-carrier bands indicated by the acquired information. Fourth, information indicating channel quality of the selected sub-carrier bands is reported to the base station. ## Claims ### Claim 1 A base station comprising: a multiplexer configured to multiplex (1) control information comprising first information indicating a fixed number identifying quantity of sub-carrier bands to be selected by a mobile station for channel quality reporting; and (2) data information; a radio transmitter coupled to the multiplexer and configured to transmit the multiplexed information to the mobile station; a radio receiver configured to receive second information and third information from the mobile station; and a controller coupled to the radio receiver and configured to obtain, from the second information, channel quality of selected sub-carrier bands and to obtain, from the third information, positions of the selected sub-carrier bands, wherein the selected subcarrier bands are selected by the mobile station and quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands indicated by the first information. ### Claim 2 (depends on 1) The base station according to claim 1, wherein the selected sub-carrier bands are selected, by the mobile station, in descending order of measured channel quality. ### Claim 3 (depends on 1) The base station according to claim 1, wherein the controller is configured to determine one or more sub-carrier bands to be used by the mobile station based on the second information and the third information. ### Claim 4 (depends on 3) The base station according to claim 3, wherein the controller determines the one or more sub-carrier bands, which the second information and the third information indicate as satisfying determined criteria, for use by the mobile station. ### Claim 5 (depends on 3) The base station according to claim 3, wherein the controller determines the one or more sub-carrier bands to be used by the mobile station based on the second information and the third information, and further based on one or more sub-carrier bands determined to be used by another mobile station. ### Claim 6 (depends on 3) The base station according to claim 3, wherein the controller further determines a modulation and coding scheme for each of the determined one or more sub-carrier bands to be used by the mobile station. ### Claim 7 (depends on 3) The base station according to claim 3, wherein the controller further determines an encoding rate for each of the determined one or more sub-carrier bands to be used by the mobile station. ### Claim 8 (depends on 3) The base station according to claim 3, wherein the controller further allocates transmission data to be sent to the mobile station to each of the determined one or more sub-carrier bands. ### Claim 9 (depends on 1) The base station according to claim 1, wherein the second information is spread by the mobile station using a spreading code specific to each user, and the base station further comprises a despreader coupled to the radio receiver and configured to despread the spread information. ### Claim 10 (depends on 1) The base station according to claim 1, wherein the third information is spread by the mobile station using a spreading code specific to each user, and the base station further comprises a despreader coupled to the radio receiver and configured to despread the spread information. ### Claim 11 A communication method implemented by a base station, the method comprising: multiplexing (1) control information comprising first information indicating a fixed number identifying quantity of sub-carrier bands to be selected by a mobile station for channel quality reporting and (2) transmission data; transmitting the multiplexed information to the mobile station; receiving second information and third information from the mobile station; and obtaining, from the second information, channel quality of selected sub-carrier bands and obtaining, from the third information, positions of the selected sub-carrier bands, wherein the selected sub-carrier bands are selected by the mobile station and quantity of the selected sub-carrier bands matches the quantity of sub-carrier bands indicated by the first information. ### Claim 12 (depends on 11) The communication method according to claim 11, wherein the selected sub-carrier bands are selected, by the mobile station, in descending order of measured channel quality. ### Claim 13 (depends on 11) The communication method according to claim 11, further comprising determining one or more sub-carrier bands to be used by the mobile station based on the second information and the third information. ### Claim 14 (depends on 13) The communication method according to claim 13, wherein the one or more sub-carrier bands, which the second information and the third information indicate as satisfying determined criteria, are determined to be used by the mobile station. ### Claim 15 (depends on 13) The communication method according to claim 13, wherein the one or more sub-carrier bands to be used by the mobile station are determined based on the second information and the third information, and further based on one or more sub-carrier bands determined to be used by another mobile station. ### Claim 16 (depends on 13) The communication method according to claim 13, further comprising determining a modulation and coding scheme for each of the determined one or more sub-carrier bands to be used by the mobile station. ### Claim 17 (depends on 13) The communication method according to claim 13, further comprising determining an encoding rate for each of the determined one or more sub-carrier bands to be used by the mobile station. ### Claim 18 (depends on 13) The communication method according to claim 13, further comprising allocating transmission data to be sent to the mobile station to each of the determined one or more sub-carrier bands. ### Claim 19 (depends on 11) The communication method according to claim 11, wherein the second information is spread by the mobile station using a spreading code specific to each user, and the method further comprises despreading the spread information. ### Claim 20 (depends on 11) The communication method according to claim 11, wherein the third information is spread by the mobile station using a spreading code specific to each user, and the method further comprises despreading the spread information. ### Claim 21 A wireless communication apparatus comprising: a radio receiver configured to acquire, from a base station, multiplexed information comprising (1) control information comprising first information indicating a fixed number identifying quantity of sub-carrier bands to be selected by a mobile station for channel quality reporting; and (2) data information; a demultiplexer configured to demultiplex the multiplexed information and to provide demultiplexed control information and data information; 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 received signals; a subcarrier selector coupled to the radio receiver and configured to select subcarrier bands from the plurality of sub-carrier bands, wherein quantity of the selected subcarrier bands matches the quantity of sub-carrier bands identified by the fixed number obtained from the demultiplexed control 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 subcarrier bands according to the modulation scheme; and a radio transmitter configured to report to the base station the second and third modulated information. ### Claim 22 (depends on 21) The wireless communication apparatus according to claim 21, wherein the subcarrier selector is configured to select the indicated fixed number of sub-carrier bands in descending order of measured channel quality. ### Claim 23 (depends on 21) The wireless communication apparatus according to claim 21, 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 24 (depends on 21) The wireless communication apparatus according to claim 21, wherein the radio transmitter is further configured to spread the third information indicating positions of the selected sub-carrier hands using a spreading code specific to each user, and report the spread information.