# US 2019/0356398 A1 · Method for performing beam measurement in wireless communication system and device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356398 A1 - Document ID: US20190356398A1 - Status: Published application - Kind: A1 - Application number: 16/486,142 - Filed: 2017-02-15 - Published: 2019-11-21 - Earliest claimed: 2017-02-15 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Heejin KIM; Ilmu BYUN; Jiwon KANG; Heejeong CHO; Genebeck HAHN - Web page: https://patentgrep.com/patent/US20190356398A1 ## CPC - H04B 7/0696: {Determining beam pairs} - H04B 7/088: {using beam selection} - H04B 17/24: with feedback of measurements to the transmitter - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04B 17/327: Received signal code power [RSCP] - 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 5/0094: {Indication of how sub-channels of the path are allocated} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present invention provides a method for performing beam measurement in a wireless communication system, and a device for the method. Particularly, a method for a terminal to perform beam measurement in a wireless communication system may comprise: a step of receiving a plurality of reference signals corresponding to a plurality of transmission beams; a step of identifying at least one first transmission beam corresponding to at least one first reception beam included in a first reception beam group, on the basis of measurement performed on the first reception beam group by using the plurality of reference signals; a step of identifying at least one second transmission beam corresponding to at least one second reception beam included in a second reception beam group, on the basis of measurement performed on the second beam group by using the plurality of reference signals; and a step of reporting, to a base station, an index of the identified at least one first transmission beam and an index of the identified at least one second transmission beam, respectively. ## Claims ### Claim 1 A method for performing a beam measurement in a wireless communication system, the method performed by a User Equipment comprising: receiving a plurality of reference signals corresponding to a plurality of transmission (Tx) beams; identifying at least one first Tx beam corresponding to at least one first reception (Rx) beam that belongs to a first reception (Rx) beam group based on a measurement performed for the first Rx beam group using the plurality of reference signals; identifying at least one second Tx beam corresponding to at least one second Rx beam that belongs to a second Rx beam group based on a measurement performed for the second Rx beam group using the plurality of reference signals; and reporting each of an index of the identified at least one first Tx beam and an index of the identified at least one second Tx beam to a base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the step of reporting each of an index of the identified at least one first Tx beam and an index of the identified at least one second Tx beam to a base station includes: reporting at least one first index pair including the index of the at least one first Tx beam and the index of the at least one first Rx beam; and reporting at least one second index pair including the index of the at least one second Tx beam and the index of the at least one second Rx beam. ### Claim 3 (depends on 2) The method of claim 2, wherein each of a number of the indexes of the at least one first Tx beam and a number of the indexes of the at least one second Tx beam is determined based on configuration information received through a higher layer signaling from the base station. ### Claim 4 (depends on 2) The method of claim 2, wherein the index of the at least one first Tx beam and the index of the at least one second Tx beam is periodically reported based on reporting period configuration information received from the base station. ### Claim 5 (depends on 2) The method of claim 2, wherein the index of the at least one first Tx beam and the index of the at least one second Tx beam is aperiodically reported based on a predefined event. ### Claim 6 (depends on 1) The method of claim 1, further comprising: reporting, to the base station, information indicating a priority for at least one of the first Rx beam group or the second Rx beam group. ### Claim 7 (depends on 6) The method of claim 6, wherein the priority is determined based on at least one of Signal-to-Noise Ratio (SNR) or Signal-to-Interference-plus-Noise Ratio (SINR). ### Claim 8 (depends on 1) The method of claim 1, further comprising: reporting first Reference Signal Received Power (RSRP) information measured for the first Rx beam group to the base station; and reporting second RSRP information measured for the second Rx beam group to the base station. ### Claim 9 (depends on 8) The method of claim 8, wherein the first RSRP information includes a number of antenna ports used for RSRP measurement for the first Rx beam group, and wherein the second RSRP information includes a number of antenna ports used for RSRP measurement for the second Rx beam group. ### Claim 10 (depends on 1) The method of claim 1, wherein the first Rx beam group and the second Rx beam group are determined among a plurality of Rx beams based on information for a channel property or a beam direction measured in the User Equipment. ### Claim 11 (depends on 1) The method of claim 1, wherein the first Rx beam group and the second Rx beam group are determined based on beam group configuration information received through the higher layer signaling from the base station. ### Claim 12 A User Equipment for performing a beam measurement in a wireless communication system, comprising: a transmitting/receiving unit for transmitting and receiving a radio signal; and a processor functionally connected to the transmitting/receiving unit, wherein the processor is configured to: receive a plurality of reference signals corresponding to a plurality of transmission (Tx) beams; identify at least one first Tx beam corresponding to at least one first reception (Rx) beam that belongs to a first reception (Rx) beam group based on a measurement performed for the first Rx beam group using the plurality of reference signals; identify at least one second Tx beam corresponding to at least one second Rx beam that belongs to a second Rx beam group based on a measurement performed for the second Rx beam group using the plurality of reference signals; and report each of an index of the identified at least one first Tx beam and an index of the identified at least one second Tx beam to a base station.