# US 10,122,431 B2 · Method for configuring reference signal for three-dimensional MIMO in wireless communication system and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,431 B2 - Document ID: US10122431B2 - Status: Granted - Kind: B2 - Application number: 15/513,419 - Filed: 2015-03-31 - Published: 2017-10-26 - Granted: 2018-11-06 - Earliest claimed: 2014-10-01 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jiwon Kang; Kitae Kim; Kilbom Lee; Heejin Kim - Web page: https://patentgrep.com/patent/US10122431B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0413: MIMO systems - H04B 7/0417: Feedback systems - H04B 7/0452: Multi-user MIMO systems - H04B 7/0479: {for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]} - H04B 7/0617: {for beam forming} - H04L 25/0224: {using sounding signals} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In the present application, a method for reporting channel status information (CSI) for multi-antenna-based beamforming by a terminal in a wireless communication system is disclosed. Specifically, the method comprises the steps of: receiving reference signal configuration information including two or more reference signal resources through an upper layer; receiving CSI process information through the upper layer; receiving a reference signal from a base station on the basis of the reference signal configuration information; and calculating the CSI on the basis of the CSI process information and the received reference signal and reporting the CSI to the base station, wherein the CSI process information includes a reference signal type indicator indicating a mapping relationship between the reference signal configuration information and multiple antennas. ## Claims ### Claim 1 A method of reporting channel status information (CSI) for multiple input multiple output (MIMO) based beamforming by a user equipment (UE) in a wireless communication system, the method comprising: receiving reference signal configuration information including two or more reference signal resources information through a higher layer; receiving CSI process information through the higher layer; receiving, from a base station, a reference signal based on the reference signal configuration information; and reporting, to the base station, the CSI calculated based on the CSI process information and the received reference signal, wherein the CSI process information includes a reference signal type indicator indicating a mapping relation between the reference signal configuration information and multiple, wherein the reference signal type indicator indicates a first type reference signal configuration or a second type reference signal configuration, wherein, if the reference signal type indicator indicates the first type reference signal configuration, the two or more reference signal resources information correspond to all columns or all rows of the multiple antennas, and wherein, if the reference signal type indicator indicates the second type reference signal configuration, one of the two or more reference signal resources information corresponds to a row in the multiple antennas and another of the two or more reference signal resources information corresponds to a column in the multiple antennas. ### Claim 2 (depends on 1) The method according to claim 1, wherein the two or more reference signal resources information are distinguished by at least one of different subframe configurations or different resource element pattern configurations. ### Claim 3 (depends on 1) The method according to claim 1, wherein, if the reference signal type indicator indicates the second type reference signal configuration, the CSI process information includes information on a vertical codebook and information on a horizontal codebook. ### Claim 4 (depends on 1) The method according to claim 1, wherein the reference signal configuration information includes information on a total number of antenna ports of the multiple antennas, and wherein each of the two or more reference signal resources information includes information on a number of antenna ports for a corresponding reference signal resource. ### Claim 5 A method of receiving channel status information (CSI) for multiple input multiple output (MIMO) based beamforming by a base station in a wireless communication system, the method comprising: transmitting reference signal configuration information including two or more reference signal resources information to a user equipment (UE) through a higher layer; transmitting CSI process information to the UE through the higher layer; transmitting, to the UE, a reference signal based on the reference signal configuration information; and receiving the CSI calculated based on the CSI process information and the received reference signal from the UE, wherein the CSI process information includes a reference signal type indicator indicating a mapping relation between the reference signal configuration information and multiple, wherein the reference signal type indicator indicates a first type reference signal configuration or a second type reference signal configuration, wherein, if the reference signal type indicator indicates the first type reference signal configuration, the two or more reference signal resources information correspond to all columns or all rows of the multiple antennas, and wherein, if the reference signal type indicator indicates the second type reference signal configuration, one of the two or more reference signal resources information corresponds to a row in the multiple antennas and another of the two or more reference signal resources information corresponds to a column in the multiple antennas. ### Claim 6 (depends on 5) The method according to claim 5, wherein the two or more reference signal resources information are distinguished by at least one of different subframe configurations or different resource element pattern configurations. ### Claim 7 (depends on 5) The method according to claim 5, wherein, if the reference signal type indicator indicates the second type reference signal configuration, the CSI process information includes information on a vertical codebook and information on a horizontal codebook. ### Claim 8 (depends on 5) The method according to claim 5, wherein the reference signal configuration information includes information on a total number of antenna ports of the multiple antennas, and wherein each of the two or more reference signal resources information includes information on a number of antenna ports for a corresponding reference signal resource.