# US 10,374,677 B2 · Method for channel-related feedback and apparatus for same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,677 B2 - Document ID: US10374677B2 - Status: Granted - Kind: B2 - Application number: 15/524,253 - Filed: 2015-11-03 - Published: 2017-11-23 - Granted: 2019-08-06 - Earliest claimed: 2014-11-04 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kunil Yum; Daesung Hwang; Kijun Kim; Yunjung Yi - Web page: https://patentgrep.com/patent/US10374677B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/06: at the transmitting station - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0636: {Feedback format} - H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04B 17/24: with feedback of measurements to the transmitter - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In a method for performing, by a rank-restricted terminal, a downlink channel-related feedback in a wireless communication system according to an embodiment of the present invention, the method includes the steps of: measuring a downlink channel; and feeding back information for improving a coverage on the basis of the measured downlink channel value, wherein the information for improving the coverage may include a repetition level indicator for improving the coverage. ## Claims ### Claim 1 A method for performing reporting of information for coverage enhancement by a rank-limited terminal in a wireless communication system, the method comprising: receiving a reporting configuration of the information for coverage enhancement; measuring a downlink channel based on the reporting configuration; and reporting the information for coverage enhancement determined based on a value of the measured downlink channel, wherein the information for coverage enhancement includes a repetition level indicator for coverage enhancement, wherein the information for coverage enhancement is transmitted in a transmission instance for a rank indicator configured for the terminal, and wherein the information for coverage enhancement has a higher priority than channel state information to be reported by the terminal. ### Claim 2 (depends on 1) The method according to claim 1, wherein the information for coverage enhancement comprises further includes a repetition level indicator for downlink and a repetition level indicator for uplink. ### Claim 3 (depends on 1) The method according to claim 1, wherein the information for coverage enhancement further includes a repetition level indicator for an individual physical channel. ### Claim 4 (depends on 1) The method according to claim 1, wherein the repetition level indicator includes a repetition level for coverage enhancement or a repetition level offset for coverage enhancement. ### Claim 5 (depends on 1) The method according to claim 1, wherein a reporting of channel state information is dropped when the reporting of the information for coverage enhancement collides with reporting of the channel state information. ### Claim 6 (depends on 1) The method according to claim 1, further comprising: receiving downlink data transmitted using a coverage enhancement technique according to the information for coverage enhancement. ### Claim 7 (depends on 1) The method according to claim 1, wherein the reporting of the information for coverage enhancement is included and transmitted in a measurement report for a reference signal received power (RSRP) or a reference signal received quality (RSRQ). ### Claim 8 A rank-limited terminal configured to perform reporting of information for coverage enhancement, the terminal comprising: a radio frequency (RF) unit; and a processor configured to control the RF unit, wherein the processor is configured to: receive a reporting configuration of the information for coverage enhancement; measure a downlink channel according to the reporting configuration; and report the information for coverage enhancement determined based on a value of the measured downlink channel, wherein the information for coverage enhancement includes a repetition level indicator for coverage enhancement, and wherein the information for coverage enhancement is transmitted in a transmission instance for a rank indicator configured for the terminal, and wherein the information for coverage enhancement has a higher priority than channel state information to be reported by the terminal. ### Claim 9 (depends on 8) The terminal according to claim 8, wherein the information for coverage enhancement further includes a repetition level indicator for downlink and a repetition level indicator for uplink. ### Claim 10 (depends on 8) The terminal according to claim 8, wherein the information for coverage enhancement further includes a repetition level indicator for an individual physical channel. ### Claim 11 (depends on 8) The terminal according to claim 8, wherein the repetition level indicator includes a repetition level for coverage enhancement or a repetition level offset for coverage enhancement. ### Claim 12 (depends on 8) The terminal according to claim 8, wherein a reporting of channel state information is dropped when reporting of the information for coverage enhancement collides with reporting of the channel state information. ### Claim 13 (depends on 8) The terminal according to claim 8, wherein the processor is configured to receive downlink data transmitted using a coverage enhancement technique according to the information for coverage enhancement. ### Claim 14 (depends on 8) The terminal according to claim 8, wherein the reporting of the information for coverage enhancement is included and transmitted in a measurement report on a reference signal received power (RSRP) or a reference signal received quality (RSRQ).