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公开(公告)号：US11943810B2
公开(公告)日：2024-03-26
申请号：US17885345
申请日：2022-08-10
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Shoko Shinohara , Yasuhiko Inoue , Junichi Iwatani , Masato Mizoguchi
CPC classification number: H04W74/0816 , H04L1/0021 , H04W16/08 , H04W28/06 , H04W72/541 , H04W48/02 , H04W84/12
Abstract: A format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format, and a format that does not include a BSSID within the preamble but includes a BSSID in a MAC header is a Non-HE format; and a wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above, and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the HE format and the BSSID in the received frame is not consistent with its own BSS.
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公开(公告)号：US11304234B2
公开(公告)日：2022-04-12
申请号：US16787827
申请日：2020-02-11
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Shoko Shinohara , Yasuhiko Inoue , Akira Kishida , Riichi Kudo , Masato Mizoguchi
Abstract: A predetermined STA includes a station information collection unit collecting from the STA itself and other STAs station information used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission, and a simultaneous-transmission request unit knowing occurrence of a QoS data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to an AP. The AP includes a station information collection unit; a simultaneous-transmission determination unit selecting a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame; and a trigger transmission unit transmitting to each of the STAs performing the simultaneous transmission a trigger frame instructing to performs the simultaneous transmission and including information necessary for controlling the simultaneous transmission. Each of the STAs designated by the trigger frame is configured to simultaneously transmit the wireless frames to the AP.
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公开(公告)号：US11172509B2
公开(公告)日：2021-11-09
申请号：US16787175
申请日：2020-02-11
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Shoko Shinohara , Yasuhiko Inoue , Akira Kishida , Riichi Kudo , Masato Mizoguchi
Abstract: A predetermined STA includes a station information collection unit collecting from the STA itself and other STAs station information used for selection of STAs performing simultaneous transmission and for control of the simultaneous transmission, and a simultaneous-transmission request unit knowing occurrence of a QoS data frame based on the station information and transmitting a request frame requesting the simultaneous transmission to an AP. The AP includes a station information collection unit; a simultaneous-transmission determination unit selecting a combination of the STAs performing the simultaneous transmission based on the station information by reception of the request frame; and a trigger transmission unit transmitting to each of the STAs performing the simultaneous transmission a trigger frame instructing to performs the simultaneous transmission and including information necessary for controlling the simultaneous transmission. Each of the STAs designated by the trigger frame is configured to simultaneously transmit the wireless frames to the AP.
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公开(公告)号：US11026262B2
公开(公告)日：2021-06-01
申请号：US15747612
申请日：2016-08-15
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Riichi Kudo , Hirantha Sithira Abeysekera , Munehiro Matsui , Shoko Shinohara , Yasushi Takatori , Takeo Ichikawa , Masato Mizoguchi
Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.
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公开(公告)号：US10778296B2
公开(公告)日：2020-09-15
申请号：US16596729
申请日：2019-10-08
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Tomoki Murakami , Yusuke Asai , Riichi Kudo , Koichi Ishihara , Masato Mizoguchi , Takeo Ichikawa
IPC: H04B7/0452 , H04J11/00 , H04L5/00 , H04L27/26 , H04W28/16 , H04B7/024 , H04B7/06 , H04B7/0456 , H04W88/08
Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.
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Patent Agency Ranking
公开(公告)号：US09923678B2
公开(公告)日：2018-03-20
申请号：US14414837
申请日：2013-07-19
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirantha Sithira Abeysekera , Yasuhiko Inoue , Yusuke Asai , Shoko Shinohara , Takeo Ichikawa , Masato Mizoguchi
CPC classification number: H04L5/0007 , H04B7/0413 , H04J11/005 , H04J11/0063 , H04L5/001 , H04L5/0023 , H04L5/0044 , H04L5/0098 , H04W72/04 , H04W84/12
Abstract: There is provided a wireless communication system which can improve throughputs in wireless communication by effectively using frequency resources. In the wireless communication system including a plurality of wireless communication stations which may operate as wireless communication terminals or wireless base stations, the wireless communication station includes an access right acquisition means of acquiring an access right upon generating transmitting data; a determination means of determining whether or not different data destined to a plurality of wireless communication stations can be transmitted on different channels according to OFDMA; and a data transmitting means of transmitting data to the receivable wireless communication stations using OFDMA when the determination means determines that different data destined to a plurality of wireless communication stations can be transmitted on different channels.
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公开(公告)号：US09614621B2
公开(公告)日：2017-04-04
申请号：US14550424
申请日：2014-11-21
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Koichi Ishihara , Takayuki Kobayashi , Riichi Kudo , Yasushi Takatori , Munehiro Matsui , Masato Mizoguchi , Akihide Sano , Shogo Yamanaka , Etsushi Yamazaki , Yutaka Miyamoto , Eiji Yoshida , Tadao Nakagawa
IPC: H04B10/12 , H04B10/50 , H04B10/079 , H04B10/2513 , H04B10/556 , H04B10/61 , H04L7/027
CPC classification number: H04B10/50 , H04B10/07951 , H04B10/2513 , H04B10/556 , H04B10/616 , H04B10/6161 , H04L7/027
Abstract: To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.
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公开(公告)号：US09363003B2
公开(公告)日：2016-06-07
申请号：US14430886
申请日：2013-11-05
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Koichi Ishihara , Yasushi Takatori , Masato Mizoguchi , Yusuke Asai , Tomoki Murakami
CPC classification number: H04B7/0626 , H04B7/0452 , H04B7/0456 , H04B7/0615 , H04B7/0617 , H04B7/0619 , H04B7/063 , H04B7/0697
Abstract: A transmitter that has a plurality of antenna elements and executes spatially multiplexed transmission of data to a receiver via the antenna elements, where the data is weighted utilizing a transmission weight. Channel state information, which indicates propagation characteristics between the antenna elements and an antenna element of the receiver, is obtained or estimated. When the channel state information has been updated, an updated transmission weight is computed based on the previous channel state information before the updating thereof and/or the updated channel state information, and the previous transmission weight before the updating thereof, which was computed for the previous channel state information.
Abstract translation: 具有多个天线元件并且经由天线元件执行数据到接收机的空间复用传输的发射机，其中利用传输权重对数据进行加权。 指示天线元件与接收器的天线元件之间的传播特性的通道状态信息。 当信道状态信息已被更新时，基于在其更新之前的先前信道状态信息和/或更新的信道状态信息以及在更新之前的先前传输权重计算更新的传输权重， 以前的频道状态信息。
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公开(公告)号：US20150172012A1
公开(公告)日：2015-06-18
申请号：US14414995
申请日：2013-07-19
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hirantha Sithira Abeysekera , Yasuhiko Inoue , Yusuke Asai , Shoko Shinohara , Takeo Ichikawa , Masato Mizoguchi
CPC classification number: H04L5/0007 , H04J1/00 , H04J11/00 , H04J11/005 , H04J11/0063 , H04L1/18 , H04L1/1854 , H04L5/0023 , H04L5/0032 , H04L5/0035 , H04L5/0087 , H04L5/0098 , H04L27/0006 , H04W16/14 , H04W28/16 , H04W72/0426 , H04W74/0808
Abstract: In order to provide a wireless communication system capable of improving the throughput of wireless communication by effectively using frequency resources, in a wireless communication system in which a first wireless access point which communicates with one or more wireless stations within a first cell by orthogonal frequency-division multiple access and a second wireless access point which is capable of performing carrier sensing with the first wireless access point and communicates with one or more wireless stations within a second cell by the orthogonal frequency-division multiple access operate in cooperation with each other, the first wireless access point includes a transmission opportunity acquiring unit which acquires a transmission opportunity when data to be transmitted is generated; and a transmitting unit of permission for use which transmits permission for use of channels which are not scheduled to use within the first cell, to the second wireless access point in a period in which the transmission opportunity is acquired, and the second wireless access point includes a communication unit which communicates with the wireless station within the second cell via the channel in which the permission for use is acquired from the first wireless access point.
Abstract translation: 为了提供一种能够通过有效利用频率资源来提高无线通信的吞吐量的无线通信系统，在无线通信系统中，在无线通信系统中，通过正交频分复用方式与第一小区内的一个或多个无线站进行通信， 能够与第一无线接入点进行载波侦听的第二无线接入点和通过正交频分多址的第二小区内的一个或多个无线站进行协作操作的第二无线接入点， 第一无线接入点包括发送机会获取单元，其在生成要发送的数据时获取发送机会; 以及在获取发送机会的时段内向第二无线接入点发送允许使用未被调度用于第一小区的信道的使用许可的发送单元，并且第二无线接入点包括 通信单元，其经由其中从第一无线接入点获取使用许可的信道与第二小区内的无线站进行通信。
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公开(公告)号：US11849487B2
公开(公告)日：2023-12-19
申请号：US17989210
申请日：2022-11-17
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Riichi Kudo , Hirantha Sithira Abeysekera , Munehiro Matsui , Shoko Shinohara , Yasushi Takatori , Takeo Ichikawa , Masato Mizoguchi
CPC classification number: H04W74/0833 , H04W72/23 , H04W72/54 , H04W74/0816 , H04W72/542 , H04W74/04 , H04W84/12
Abstract: Provided is a wireless communication system in which, based on a random access scheme, a transmission opportunity (TXOP) acquired by a wireless access point is granted to a wireless station when performing uplink data transmission from the wireless station to the wireless access point and the TXOP acquired by the wireless station is granted to the wireless access point when performing downlink data transmission from the wireless access point to the wireless station, the system includes a scheduling unit for TXOP granting determining one or more wireless stations having a quality of an uplink data transmission lower than a prescribed value as TXOP responders to which the wireless access point grants the TXOP, and determining one or more wireless stations having a quality of a downlink data transmission lower than the prescribed value as TXOP holders which grant the TXOP to the wireless access point.
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