# US 2020/0288462 A1 · Channel quality information reporting for subframes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288462 A1 - Document ID: US20200288462A1 - Status: Published application - Kind: A1 - Application number: 16/881,558 - Filed: 2020-05-22 - Published: 2020-09-10 - Earliest claimed: 2011-08-12 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Alexander Golitschek Edler von Elbwart; Masayuki Hoshino - Web page: https://patentgrep.com/patent/US20200288462A1 ## CPC - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713) - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0029: {Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling (power control H04W52/04)} - 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 72/00: Local resource management - H04W 72/542: using measured or perceived quality - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The integrated circuit according to claim 1, wherein the first CSI is determined for a frequency band, and the second CSI is determined for at least one subband of the frequency band. ### Claim 3 (depends on 1) The integrated circuit according to claim 1, wherein the first CSI is determined for a first codeword, and the second CSI is determined for a second codeword. ### Claim 4 (depends on 1) The integrated circuit according to claim 1, wherein the process comprises: receiving from the base station at least one of a first-set indicator that indicates the first set of channel state values and a second-set indicator that indicates the second set of channel state values. ### Claim 5 (depends on 1) The integrated circuit according to claim 1, wherein the second set of channel state values includes the first set of channel state values and at least one further channel state value. ### Claim 6 (depends on 1) The integrated circuit according to claim 1, wherein the channel state values in the second set include modulation and coding scheme indexes as well as an index specifying that a defined modulation and coding scheme is out of range. ### Claim 7 (depends on 6) The integrated circuit according to claim 6, wherein the index specifying that the defined modulation and coding scheme is out of range is located at the first position within the second set. ### Claim 8 (depends on 6) The integrated circuit according to claim 6, wherein the modulation and coding scheme index is an index in a table including a threshold channel quality value. ### Claim 9 (depends on 8) The integrated circuit according to claim 8, wherein the threshold channel quality value is based on at least one of signal to interference plus noise ratio, error rate, and spectral efficiency. ### Claim 10 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. ### Claim 11 (depends on 10) The integrated circuit according to claim 10, wherein the first CSI is determined for a frequency band, and the second CSI is determined for at least one subband of the frequency band. ### Claim 12 (depends on 10) The integrated circuit according to claim 10, wherein the first CSI is determined for a first codeword, and the second CSI is determined for a second codeword. ### Claim 13 (depends on 10) The integrated circuit according to claim 10, wherein the reception circuitry, in operation, controls reception from the base station of at least one of a first-set indicator that indicates the first set of channel state values and a second-set indicator that indicates the second set of channel state values. ### Claim 14 (depends on 10) The integrated circuit according to claim 10, wherein the second set of channel state values includes the first set of channel state values and at least one further channel state value. ### Claim 15 (depends on 10) The integrated circuit according to claim 10, wherein the channel state values in the second set include modulation and coding scheme indexes as well as an index specifying that a defined modulation and coding scheme is out of range. ### Claim 16 (depends on 15) The integrated circuit according to claim 15, wherein the index specifying that the defined modulation and coding scheme is out of range is located at the first position within the second set. ### Claim 17 (depends on 15) The integrated circuit according to claim 15, wherein the modulation and coding scheme index is an index in a table including a threshold channel quality value. ### Claim 18 (depends on 17) The integrated circuit according to claim 17, wherein the threshold channel quality value is based on at least one of signal to interference plus noise ratio, error rate, and spectral efficiency.