# US 12,597,975 B2 · Base station, communication terminal, and communication method for base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,597,975 B2 - Document ID: US12597975B2 - Status: Granted - Kind: B2 - Application number: 18/754,567 - Filed: 2024-06-26 - Published: 2025-01-09 - Granted: 2026-04-07 - Earliest claimed: 2023-07-07 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Kohei Yoshida; Masakazu Ono - Web page: https://patentgrep.com/patent/US12597975B2 ## CPC - H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)} - H04B 7/0695: {using beam selection} - H04B 7/06958: {Multistage beam selection, e.g. beam refinement} - H04B 7/088: {using beam selection} - H04B: TRANSMISSION ## Abstract Provided is a base station including: an antenna that emits at least one searching radio beam for searching for a communication terminal and a communication radio beam for communicating with a communication terminal; and at least one processor that executes a transmission process of simultaneously transmitting, from the antenna, a plurality of searching radio beams that are oriented in directions which are different from each other, a reception process of receiving radio waves transmitted from a communication terminal in accordance with the plurality of searching radio beams simultaneously transmitted in the transmission process, and a communication process of communicating, with use of the communication radio beam, with the communication terminal that transmitted the radio waves which were received in the reception process. ## Claims ### Claim 1 A base station for a communication terminal, said base station comprising: an antenna that emits at least one searching radio beam for searching for the communication terminal and a communication radio beam for communicating with the communication terminal; and at least one processor, the at least one processor being configured to execute a transmission process of simultaneously transmitting, from the antenna, a plurality of searching radio beams that are oriented in directions which are different from each other, a reception process of receiving radio waves transmitted from the communication terminal in accordance with the plurality of searching radio beams simultaneously transmitted in the transmission process, and a communication process of communicating, with use of the communication radio beam, with the communication terminal that transmitted the radio waves which were received in the reception process, wherein the plurality of searching radio beams include a second set of searching radio beams that have identical frequencies and that are separate from each other. ### Claim 2 (depends on 1) The base station according to claim 1, wherein in the transmission process, the at least one processor transmits the second set of searching radio beams while changing the directions of the second set of searching radio beams. ### Claim 3 (depends on 1) The base station according to claim 1, wherein in the transmission process, the at least one processor stops transmitting the second set of searching radio beams and transmits a third set of searching radio beams that have identical frequencies, that are separate from each other, and that do not overlap the second set of searching radio beams in direction. ### Claim 4 (depends on 1) The base station according to claim 1, further comprising a memory that stores a table which indicates frequencies and transmission directions of the plurality of searching radio beams in such a manner that the frequencies and the transmission directions are associated with each other, wherein in the transmission process, the at least one processor transmits the plurality of searching radio beams using the frequencies and the directions based on the table. ### Claim 5 (depends on 4) The base station according to claim 4, wherein: in the table, frequencies and transmission directions of the plurality of searching radio beams and at least one selected from the group consisting of the number of the plurality of searching radio beams, the type of the antenna, and an interference state of radio waves are indicated in such a manner as to be associated with each other; and the at least one processor executes an acquisition process of acquiring information of the at least one selected from the group consisting of the number of the plurality of searching radio beams, the type of the antenna, and the interference state of the radio waves and, in the transmission process, transmits the plurality of searching radio beams using the frequencies and the directions based on the table. ### Claim 6 A communication terminal that communicates with a base station, the communication terminal comprising an antenna that transmits and receives radio waves and at least one processor, the at least one processor being configured to execute a reception process of receiving, via the antenna, any of a plurality of searching radio beams that have been transmitted from the base station and that are oriented in directions which are different from each other, an extraction process of extracting, from a searching radio beam received in the reception process, direction identification information that identifies a direction of the base station, a transmission process of transmitting a radio beam toward the base station based on the direction identification information that has been extracted in the extraction process, and a communication process of communicating with the base station with use of the radio beam that has been transmitted in the transmission process, wherein the plurality of searching radio beams include a second set of searching radio beams that have identical frequencies and that are separate from each other. ### Claim 7 A communication method for a base station, the method comprising: a transmission process of transmitting, from an antenna, a plurality of searching radio beams that are oriented in directions which are different from each other; a reception process of receiving radio waves transmitted from a communication terminal in accordance with the plurality of searching radio beams transmitted in the transmission process; and a communication process of communicating, with use of the communication radio beam, with the communication terminal that transmitted the radio waves which were received in the reception process, wherein the plurality of searching radio beams include a second set of searching radio beams that have identical frequencies and that are separate from each other. ### Claim 8 (depends on 7) The method according to claim 7, wherein the transmission process includes a process of transmitting the second set of searching radio beams while changing the directions of the second set of searching radio beams. ### Claim 9 (depends on 7) The method according to claim 7, wherein the transmission process includes a process of (i) stopping transmitting the second set of searching radio beams and (ii)) transmitting a third set of searching radio beams that have identical frequencies, that are separate from each other, and that do not overlap the second set of searching radio beams in direction. ### Claim 10 (depends on 7) The method according to claim 7, wherein the transmission process includes a process of transmitting the plurality of searching radio beams using frequencies and directions based on a table which indicates frequencies and transmission directions of the plurality of searching radio beams in such a manner that the frequencies and the transmission directions are associated with each other. ### Claim 11 (depends on 10) The method according to claim 10, wherein in the table, frequencies and transmission directions of the plurality of searching radio beams and at least one selected from the group consisting of the number of the plurality of searching radio beams, the type of the antenna, and an interference state of radio waves are indicated in such a manner as to be associated with each other, the method further comprises an acquisition process of acquiring information of the at least one selected from the group consisting of the number of the plurality of searching radio beams, the type of the antenna, and the interference state of the radio waves and the transmission process includes a process of transmitting the plurality of searching radio beams using the frequencies and the directions based on the table.