-
公开(公告)号：US20240030595A1
公开(公告)日：2024-01-25
申请号：US18033579
申请日：2021-10-06
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
Abstract: In a drone-type radio relay apparatus, it is provided of an antenna system capable of suppressing an inclination of an antenna due to a strong wind during a stationary flight (hovering). The antenna system is provided with a long-shaped antenna 110 connected to a relay station via a cable, and an antenna guide mechanism that is fixed to a body of a drone and guides the antenna so as to be movable in an up-down direction of a basic attitude of the drone.
-
公开(公告)号：US10945169B2
公开(公告)日：2021-03-09
申请号：US16092659
申请日：2017-03-03
Applicant: SoftBank Corp.
Inventor： Noboru Kanazawa , Daigo Ogata , Atsushi Nagate , Teruya Fujii
Abstract: A base station, a mobile communication system and a handover control method are provided, which are capable of preventing a handover failure and a ping-pong handover phenomenon which are caused by an interference from a neighboring cell to a serving cell. When a received power difference (S2−S1) between a received power S2 from a neighboring second base station, which is fed back from a mobile station, and a received power S1 from first base station, becomes larger than a predetermined threshold value, the first base station to which the mobile station is connected requests the second base station to stop a transmission of a downlink signal including at least one of a data signal and a control signal. In response to the transmission-stop request, the second base station performs a determination of a radio resource in which the transmission of the downlink signal is to be stopped and a notification of the radio resource to the first base station, and stops a transmission of a downlink signal. The first base station allocates the radio resource notified from the second base station or a radio resource partially including the notified radio resource, as a radio resource used for the downlink signal to the mobile station.
-
23.发明授权公开(公告)号：US10659965B2
公开(公告)日：2020-05-19
申请号：US16084685
申请日：2017-01-31
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
Abstract: A communication terminal apparatus, a terrestrial cellular base station and a mobile communication system are provided, which are capable of being shared in a terrestrial cellular mobile communication system and a satellite mobile communication system, preventing an interference between both systems and improving a spectral efficiency in a downlink of the terrestrial cellular mobile communication system, by simple switching control of radio resources. When the communication terminal apparatus is located in an area of the terrestrial cellular mobile communication system, all of time slots allocated to the terrestrial cellular mobile communication system and at least a part of time slots allocated to the satellite mobile communication system are used in a downlink, and all of time slots allocated to the terrestrial cellular mobile communication system are used and time slots allocated to the satellite mobile communication system are not used in an uplink.
-
24.发明申请公开(公告)号：US20190075468A1
公开(公告)日：2019-03-07
申请号：US16084685
申请日：2017-01-31
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
Abstract: A communication terminal apparatus, a terrestrial cellular base station and a mobile communication system are provided, which are capable of being shared in a terrestrial cellular mobile communication system and a satellite mobile communication system, preventing an interference between both systems and improving a spectral efficiency in a downlink of the terrestrial cellular mobile communication system, by simple switching control of radio resources. When the communication terminal apparatus is located in an area of the terrestrial cellular mobile communication system, all of time slots allocated to the terrestrial cellular mobile communication system and at least a part of time slots allocated to the satellite mobile communication system are used in a downlink, and all of time slots allocated to the terrestrial cellular mobile communication system are used and time slots allocated to the satellite mobile communication system are not used in an uplink.
-
公开(公告)号：US10149176B2
公开(公告)日：2018-12-04
申请号：US15114470
申请日：2014-01-18
Applicant: SoftBank Corp.
Inventor： Junichi Miyakawa , Teruya Fujii
Abstract: Mobile communication systems and base station control apparatuses are provided, by which a spectral efficiency can be improved while preventing interference between a terrestrial cellular mobile communication system and a satellite mobile communication system, and mobile communication services using mobile station apparatuses can be provided more surely in an emergent condition in which a failure occurs in a part of terrestrial cellular base stations. A same frequency band is used for radio communications between a mobile station apparatus 10 and each of terrestrial cellular base stations 20 and a communication relay apparatus 41 of artificial satellite 40. A radio resource used in the terrestrial cellular base stations 20 and a radio resource used in a satellite base station 30 in a common area where the terrestrial cellular mobile communication system and the satellite mobile communication system are available are allocated so as not to overlap with each other, and the radio resource allocated for the satellite base station is increased in the emergent condition in which a failure occurs in a part of the terrestrial cellular base stations so as to be more than that in a normal condition.
-
Patent Agency Ranking
公开(公告)号：US09930555B2
公开(公告)日：2018-03-27
申请号：US14911531
申请日：2015-01-21
Applicant: SoftBank Corp.
Inventor： Liang Zhang , Takao Okamawari , Teruya Fujii
Abstract: Methods and systems of measuring communication quality in a communication via a mobile communication network are provided. A connection status of a communication terminal apparatus to a mobile communication network is confirmed when a timing of transmitting a measurement data of the communication terminal apparatus side from the communication terminal apparatus to a server comes. The measurement data is transmitted from the communication apparatus to the server when determining that it is a status capable of transceiving the measurement data, based on the confirmation result of connection status, and the measurement data is not transmitted from the communication terminal apparatus to the server when determining it is not a status capable of transceiving the measurement data. A communication quality in the communication via the mobile communication network is measured based on the measurement data received by the server from the communication terminal apparatus.
-
公开(公告)号：US12225334B2
公开(公告)日：2025-02-11
申请号：US18555565
申请日：2022-04-12
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
IPC: H04Q11/00
Abstract: Provided is a repeater-type radio relay system that can prevent loop interference of radio waves with the same frequency and does not require a frequency for relaying. The radio relay system is provided with one or more optical fibers for relaying an optical communication between a relay-source radio relay apparatus and a relay-destination radio relay apparatus. The relay-source radio relay apparatus has a network-side communication section for communicating with a mobile-communication network side, and an electro-optical signal conversion section of relay source for converting between an electrical signal in the mobile-communication network side received from the network-side communication section and an optical signal propagating through the optical fiber. The relay-destination radio relay apparatus has a terminal-side communication section for wirelessly communicating with the terminal apparatus side, and an electro-optical signal conversion section of relay destination for converting between an electric signal in the terminal apparatus side received from the terminal-side communication section and an optical signal propagating through the optical fiber.
-
公开(公告)号：US11973573B2
公开(公告)日：2024-04-30
申请号：US18261729
申请日：2022-01-12
Applicant: SoftBank Corp.
Inventor： Takafumi Fujii , Teruya Fujii
IPC: H04B7/185
CPC classification number: H04B7/18513
Abstract: It is prevented of degradation of communication quality caused by estimation errors of plural path differences between plural antennas for feeder link (FL antennas) incorporated in an aerial-staying type communication relay apparatus and plural gateway (GW) stations. The aerial-staying type communication relay apparatus estimates plural first path differences Δdji respectively between the plural GW stations and the plural FL antennas with reference to a main path, based on plural pilot reception signals received from the plural GW stations, obtains plural correction values corresponding to the plural first path differences, based on the plural pilot reception signals, estimates a propagation path response in the transmission signal band of the feeder link, based on plural corrected second path differences Δdji_new obtained by respectively correcting the plural first path differences with plural correction values, calculates and stores reception weights for suppressing interference signals, and applies the plural reception weights to reception signals received via the plural antennas for feeder link, with respect to each of the plural gateway stations.
-
29.发明申请公开(公告)号：US20210195542A1
公开(公告)日：2021-06-24
申请号：US16075685
申请日：2017-01-26
Applicant: SoftBank Corp.
Inventor： Sho Nabatame , Mitsukuni Konishi , Atsushi Nagate , Teruya Fujii
Abstract: A base station, a communication system and a time synchronization method between base stations are provided, which are capable of performing a time synchronization with another base station using a downlink signal of the other base station cell in which the own cell is located, without stopping transmission of the own base station even during operation. A base station 20 receives a downlink signal 255 that includes a downlink signal 11 including a synchronization signal transmitted from the other base station 10 and a downlink wraparound signal 22 transmitted from own base station 20, removes an interference of the wraparound signal from the downlink received signal, with respect to a predetermined subframe in which the downlink wraparound signal from own base station 20 interferes with the synchronization signal of the base station 10, among subframes of the downlink signal including the synchronization signal of the base station 10, performs a time synchronization processing with the base station 10 by detecting a synchronization signal timing of the base station 10 based on the downlink received signal from which the interference of wraparound signal is removed.
-
公开(公告)号：US10785738B2
公开(公告)日：2020-09-22
申请号：US16080331
申请日：2017-01-30
Applicant: SoftBank Corp.
Inventor： Shota Shiobara , Takao Okamawari , Teruya Fujii
Abstract: A deviation of time at which downlink signals synchronously transmitted from a macro-cell base station and a small-cell base station respectively reach a communication terminal apparatus can be made within an allowable range, without being affected by transmission delay in transmission cables of base station and propagation delay in radio transmission paths. The small-cell base station is provided with a radio transceiving section connected with antenna, a radio communication control section, a transmission cable connected with the radio transceiving section and the radio communication control section, and a downlink signal receiving section for receiving downlink signals transmitted from the macro-cell base station and the own base station respectively. The small-cell base station measures a reception-timing difference of downlink signals transmitted from the macro-cell base station and the own base station based on a reception result of the downlink signal, adjusts a transmission timing of downlink signal of the own base station based on the reception-timing difference, and transmits a downlink signal at the adjusted transmission timing.
-
-
-
-
-
-
-
-
-
Search Results
35
records
(took 0.016 seconds)
