# US 2020/0288454 A1 · Apparatus and method for selecting best beam in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288454 A1 - Document ID: US20200288454A1 - Status: Published application - Kind: A1 - Application number: 16/881,603 - Filed: 2020-05-22 - Published: 2020-09-10 - Earliest claimed: 2011-09-01 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Tae-Young KIM; Hyun-Kyu YU; Jae-Weon CHO - Web page: https://patentgrep.com/patent/US20200288454A1 ## CPC - H04W 72/51: based on terminal or device properties - H04B 7/0617: {for beam forming} - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An apparatus and method for selecting the best beam in a wireless communication system are provided. An operation of a Base Station (BS) includes repeatedly transmitting reference signals beamformed with a first width, receiving a feedback signal indicating at least one preferred-beam having the first width from at least one terminal, determining a direction range within which reference signals beamformed with a second width are to be transmitted and a transmission pattern, based on the at least one preferred-beam having the first width, repeatedly transmitting the reference signals beamformed with the second width within the determined direction range according to the transmission pattern, and receiving a feedback signal indicating at least one preferred-beam having the second width from the at least one terminal. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, configuration information including: information on resources in which one or more reference signals are transmitted, and information on an index for indicating a synchronization signal among one or more synchronization signals; receiving, from the base station, one or more reference signals based on the configuration information; and transmitting, to the base station, feedback information indicating an index of a reference signal among the one or more reference signals. ### Claim 2 (depends on 1) The method of claim 1, wherein information on the resources comprises: information for indicating a number of the one or more reference signals in a duration; and information on a number of durations in which the one or more reference signals are transmitted. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving, from the base station, synchronization signals with a plurality of transmission of beams of the base station before receiving the configuration information, wherein the one or more reference signals are associated with a transmission beam corresponding to the indicated synchronization signal among the plurality of transmission of beams of the base station. ### Claim 4 (depends on 1) The method of claim 1, wherein a measurement duration corresponding to the index for the synchronization signal is identified based on predefined information on a relationship between transmission beams of synchronization signals and a frame. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more synchronization signals correspond to a first beam width, wherein the one or more reference signals correspond to a second beam width, and wherein the first beam width is wider than the second beam width. ### Claim 6 A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a terminal, configuration information including: information on resources in which one or more reference signals are transmitted, and information on an index for indicating a synchronization signal among one or more synchronization signals; transmitting, to the terminal, one or more reference signals based on the configuration information; and receiving, from the terminal, feedback information indicating an index of a reference signal among the one or more reference signals. ### Claim 7 (depends on 6) The method of claim 6, wherein information on the resources comprises: information for indicating a number of the one or more reference signals in a duration; and information on a number of durations in which the one or more reference signals are transmitted. ### Claim 8 (depends on 6) The method of claim 6, further comprising: transmitting, to the terminal, synchronization signals with a plurality of transmission of beams of the base station before the configuration information, wherein the one or more reference signals are associated with a transmission beam corresponding to the indicated synchronization signal among the plurality of transmission of beams of the base station. ### Claim 9 (depends on 6) The method of claim 6, wherein a measurement duration corresponding to the index for the synchronization signal is identified based on predefined information on a relationship between transmission beams of synchronization signals and a frame. ### Claim 10 (depends on 6) The method of claim 6, wherein the one or more synchronization signals correspond to a first beam width, wherein the one or more reference signals correspond to a second beam width, and wherein the first beam width is wider than the second beam width. ### Claim 11 A terminal in a wireless communication system, comprising: at least one transceiver; and at least one processor configured to: receive, from a base station via the at least one transceiver, configuration information including: information on resources in which one or more reference signals are transmitted, and information on an index for indicating a synchronization signal among one or more synchronization signals; receive, from the base station via the at least one transceiver, one or more reference signals based on the configuration information; and transmit, to the base station via the at least one transceiver, feedback information indicating an index of a reference signal among the one or more reference signals. ### Claim 12 (depends on 11) The terminal of claim 11, wherein information on the resources comprises: information for indicating a number of the one or more reference signals in a duration; and information on a number of durations in which the one or more reference signals are transmitted. ### Claim 13 (depends on 11) The terminal of claim 11, wherein the at least one processor is further configured to: receive, from the base station via the at least one transceiver, synchronization signals with a plurality of transmission of beams of the base station before receiving the configuration information, wherein the one or more reference signals are associated with a transmission beam corresponding to the indicated synchronization signal among the plurality of transmission of beams of the base station. ### Claim 14 (depends on 11) The terminal of claim 11, wherein a measurement duration corresponding to the index for the synchronization signal is identified based on predefined information on a relationship between transmission beams of synchronization signals and a frame. ### Claim 15 (depends on 11) The terminal of claim 11, wherein the one or more synchronization signals correspond to a first beam width, wherein the one or more reference signals correspond to a second beam width, and wherein the first beam width is wider than the second beam width. ### Claim 16 A base station in a wireless communication system, comprising: at least one transceiver; and at least one processor configured to: transmit, to a terminal via the at least one transceiver, configuration information including: information on resources in which one or more reference signals are transmitted, and information on an index for indicating a synchronization signal among one or more synchronization signals; transmit, to the terminal via the at least one transceiver, one or more reference signals based on the configuration information; and receive, from the terminal via the at least one transceiver, feedback information indicating an index of a reference signal among the one or more reference signals. ### Claim 17 (depends on 16) The base station of claim 16, wherein information on the resources comprises: information for indicating a number of the one or more reference signals in a duration; and information on a number of durations in which the one or more reference signals are transmitted. ### Claim 18 (depends on 16) The base station of claim 16, wherein the at least one processor is further configured to: transmit, to the terminal via the at least one transceiver, synchronization signals with a plurality of transmission of beams of the base station before the configuration information, wherein the one or more reference signals are associated with a transmission beam corresponding to the indicated synchronization signal among the plurality of transmission of beams of the base station. ### Claim 19 (depends on 16) The base station of claim 16, wherein a measurement duration corresponding to the index for the synchronization signal is identified based on predefined information on a relationship between transmission beams of synchronization signals and a frame. ### Claim 20 (depends on 16) The base station of claim 16, wherein the one or more synchronization signals correspond to a first beam width, wherein the one or more reference signals correspond to a second beam width, and wherein the first beam width is wider than the second beam width.