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公开(公告)号：US20240276131A1
公开(公告)日：2024-08-15
申请号：US18555565
申请日：2022-04-12
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
IPC: H04Q11/00
CPC classification number: H04Q11/0071 , H04Q2011/0086 , H04Q2213/02
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.
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公开(公告)号：US20240172201A1
公开(公告)日：2024-05-23
申请号：US18279248
申请日：2022-02-08
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
IPC: H04W72/0453 , H04B7/06 , H04W16/28 , H04W52/36 , H04W72/20
CPC classification number: H04W72/0453 , H04B7/0695 , H04W16/28 , H04W52/367 , H04W72/20
Abstract: It is to provide a base station and a radio communication system that are capable of obtaining a desired communication quality by suppressing an influence of interference between a cell in an upper-airspace area and a cell in a terrestrial area, in case that a terminal apparatus is used in the upper-airspace area. A base station 20A of a mobile communication is provided with an antenna 26, a radio communication section 23 for forming a lower first cell 100A and a second cell 200A above the first cell, which are capable of using a same frequency band, and performing a radio communication via the antenna to and from a terminal apparatus 30A in the first cell and a terminal apparatus 40A in the second cell, and a resource assignment section for assigning a radio resource of the same frequency band to a communication with the terminal apparatus in any one cell of the first cell and the second cell in a same time period, and not assigning the radio resource of the same frequency band to communication with the terminal apparatus in an other cell. When the radio resource of the same frequency band is assigned to the terminal apparatus in the second cell, a transmission power control for reducing a transmission power is applied to the terminal apparatus to which the radio resource of the same frequency band is assigned.
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公开(公告)号：US10707949B2
公开(公告)日：2020-07-07
申请号：US16078753
申请日：2017-01-26
Applicant: SoftBank Corp.
Inventor： Shota Shiobara , Takao Okamawari , Teruya Fujii
IPC: H04W28/00 , H04B7/155 , H04W28/18 , H04W72/12 , H04J11/00 , H04B7/024 , H04L5/00 , H04W28/16 , H04W24/02 , H04B1/71 , H04W24/10 , H04W92/20 , H04B7/0452 , H04W36/30
Abstract: A communication system, a base station and a communication control method are provided, which are capable of cooperatively transmitting data from a plurality of base stations to a plurality of communication terminals using a same radio resource. A first base station acquires a value of an interference suppression parameter that is applied to a transmission signal from the first base station so as to suppress interference from a second base station in a first communication terminal, when the first communication terminal locates in a cell border area. The second base station duplicates a desired data for a second communication terminal located in a cell of the second base station, and transmits the duplicated desired data to the first base station. The first base station generates a transmission signal based on the value of the interference suppression parameter, the desired data for the first communication terminal, the desired data for the second communication terminal received from the second base station and a control information on data cooperative transmission, and the second base station generates a transmission signal of the desired data for the second communication terminal. Each of the base stations cooperatively transmits the transmission signal at a predetermined data cooperative transmission timing.
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公开(公告)号：US20190075535A1
公开(公告)日：2019-03-07
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.
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公开(公告)号：US09668165B2
公开(公告)日：2017-05-30
申请号：US14426493
申请日：2014-04-02
Applicant: SoftBank Corp.
Inventor： Liang Zhang , Takao Okamawari , Teruya Fujii
CPC classification number: H04W28/0236 , H04M3/2236 , H04M2207/18 , H04W24/00 , H04W24/10 , H04W28/0215 , H04W28/0226
Abstract: Methods and systems of measuring communication quality are provided, by which various types of communication quality measurements can be flexibly performed as the measurement condition can be set or changed easily and optionally, while load of processing in the communication terminal apparatus can be suppressed. Measurement condition for measuring communication quality is delivered to a communication terminal apparatus capable of communicating via a mobile communication network and a communication with the communication terminal apparatus via the mobile communication network is performed at a predetermined timing that satisfies the measurement condition. Then, at least one of terminal-side measurement data including terminal-status log information and network-side measurement data including terminal-existing base-station quality information corresponding to communication corresponding to the predetermined timing which are recorded in the communication terminal apparatus is acquired, and an index value of communication quality in communication via the mobile communication network is calculated based on at least one of the terminal-side measurement data and the network-side measurement data.
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Patent Agency Ranking
公开(公告)号：US20240014889A1
公开(公告)日：2024-01-11
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.
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公开(公告)号：US11867821B2
公开(公告)日：2024-01-09
申请号：US18253234
申请日：2021-10-06
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
CPC classification number: G01S19/115 , H04B17/27
Abstract: It is provided of a system capable of estimating a current position of a terminal apparatus, even if a terminal apparatus for mobile communication is in a condition of non-receiving or inability to receive GNSS signals. A radio relay apparatus, in which a relay station mounted on a drone, transmits radio waves from a directional antenna toward the ground while flying in an upper airspace above a target area on the ground, and transmits position information on its own apparatus obtained based on the GNSS signal, to an information processing apparatus. The terminal apparatus measures a reception power or a reception quality of radio waves transmitted from the radio relay apparatus, and transmits reception measurement information regarding the measurement result of the reception power or the reception quality, to the information processing apparatus. The information processing apparatus estimates the position of the terminal apparatus in the target area, based on the position information from the radio relay apparatus received in a flight time period during which the radio relay apparatus flies in the upper airspace above the target area and the reception measurement information from the terminal apparatus. The information processing apparatus may estimate the position where the reception power or the reception quality from the terminal apparatus is maximum, as the position of the terminal apparatus.
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公开(公告)号：US10862614B2
公开(公告)日：2020-12-08
申请号：US16072249
申请日：2017-01-25
Applicant: SoftBank Corp.
Inventor： Daigo Ogata , Atsushi Nagate , Teruya Fujii
IPC: H04L1/00 , H04W16/32 , H04L1/16 , H04L5/00 , H04L1/18 , H04W28/04 , H04J11/00 , H04L27/26 , H04W72/04 , H04W72/08 , H04B7/0413
Abstract: A base station apparatus capable of preventing occurrence of a communication delay when performing an inter-cell interference control using an ABS is provided. The base station apparatus is capable of performing an inter-cell interference control by setting an ABS pattern with one cycle of a predetermined number of subframes, and when the ABS pattern is to be switched, changes an MCS (Modulation and Coding Scheme) index value to be determined by an adaptive modulation control, for a communication within a predetermined period of time on or before a switching time of the switching, with respect to a subframe in which a communication with a mobile station apparatus is allowed before switching the ABS pattern.
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公开(公告)号：US10321323B2
公开(公告)日：2019-06-11
申请号：US15522013
申请日：2014-11-07
Applicant: SoftBank Corp.
Inventor： Teruya Fujii
Abstract: Mobile communication systems and radio resource control methods are provided, by which interference between two or more base stations can be suppressed and an inter-cell adjusting control of radio resources for each of the two or more base stations can be simplified in a mobile communication system including two or more base stations, at least a part of each cell of the base stations being mutually overlapped. Two or more cell layers are configured by grouping the two or more base station. An inter-cell adjusting control of radio resources (for example, at least one of a synchronization control of time slots and an allocation control of time slots) between the two or more cell layers is performed. An inter-cell adjusting control of radio resources between two or more base stations included in the cell layer (for example, at least one of a synchronization control of time slots and an allocation control of time slots) for each of the cell layers is also performed.
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公开(公告)号：US10104225B2
公开(公告)日：2018-10-16
申请号：US15126026
申请日：2014-04-02
Applicant: SoftBank Corp.
Inventor： Liang Zhang , Takao Okamawari , Teruya Fujii
Abstract: Communication systems and communication methods capable of evaluating a voice quality in a voice communication of a communication network and a presence or absence of a call drop of the voice communication are provided. A voice communication of transceiving a test signal for voice communication quality evaluation between a communication terminal apparatus 100 and a voice communication evaluation system 400 via the communication network 300 is performed. A voice quality evaluation value is calculated based on the test signal before transmission and the test signal after reception in the voice communication. A presence or absence of a call drop of the voice communication is determined based on a presence or absence of reception interruption of the test signal.
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