Patents by Inventor Koichi Ishihara
Koichi Ishihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20220159597Abstract: A wireless communications method for connecting a base station with each of a plurality of terminal stations set to differ in basic rate, the base station being equipped with a plurality of wireless communications units configured to be connectable with one or more of the terminal stations, includes: a collection step of collecting information about a transmission rate set for each of the terminal stations; a policy calculation step of calculating a setting policy for setting a basic rate permitted for each of the wireless communications units and a switching policy for setting a condition for switching that one of the wireless communications units which is to be connected, for each of the terminal stations, based on each item of the collected information about transmission rates; and a setting step of setting those of the terminal stations which are to be connected, for each of the wireless communications units based on the calculated setting policy and switching policy.Type: ApplicationFiled: March 11, 2020Publication date: May 19, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Toshiro NAKAHIRA, Tomoki MURAKAMI, Hirantha ABEYSEKERA, Koichi ISHIHARA, Takafumi HAYASHI, Yasushi TAKATORI
-
Publication number: 20220150715Abstract: This disclosure provides a method for calculating the installation number and installation positions of wireless base stations in accordance with the positions of wireless terminal stations within an installation area. First, when a predetermined number of wireless base stations are temporarily installed within the installation area, a wireless base station accommodating each wireless terminal station in a communication area is determined and the number of wireless base stations accommodating each wireless terminal station is calculated as a “number of conflicts”. Next, wireless base stations successively accommodating starting with an un-accommodated wireless terminal station of a small number of conflicts are successively selected as objects of installation. Then, the installation number and installation positions of the wireless base stations are calculated, with the temporarily installed wireless base stations other than the wireless base stations serving as the objects of installation being excluded.Type: ApplicationFiled: March 16, 2020Publication date: May 12, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Toshiro NAKAHIRA, Hirantha ABEYSEKERA, Koichi ISHIHARA, Takafumi HAYASHI, Yasushi TAKATORI
-
Publication number: 20220116992Abstract: A wireless communication device that detects a vacant channel by carrier sensing from among a plurality of channels and performs communication using the vacant channel includes a carrier sensing unit configured to divide channels to be carrier sensed between a wireless station and a surrounding wireless station, acquire a result of carrier sensing from the surrounding wireless station, and share results of carrier sensing from the wireless station and the surrounding wireless station to detect the vacant channel.Type: ApplicationFiled: January 14, 2020Publication date: April 14, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Riku OMIYA, Yasushi TAKATORI, Takafumi HAYASHI, Koichi ISHIHARA, Tomoki MURAKAMI
-
Patent number: 11297509Abstract: The each AP includes a control unit that detects, as the wireless environment information, a signal detection level for one or more neighboring APs positioned in the neighborhood of the AP and notifies the detected signal detection level to the central coordinator, and controls the ATT value by the setting in the central coordinator; and the central coordinator includes a parameter calculation unit that calculates the ATT value for each the APs, based on the signal detection level for each the neighboring wireless access point notified from the plurality of APs and based on an RSSI threshold at which each the APs is able to secure a prescribed service area.Type: GrantFiled: January 25, 2018Date of Patent: April 5, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hirantha Abeysekera, Tomoki Murakami, Koichi Ishihara, Mamoru Akimoto, Yasushi Takatori
-
Publication number: 20220038141Abstract: A characteristic variable antenna configured to be able to select or switch antenna characteristics in accordance with a predetermined periodic variable timing, an RF unit configured to perform a reception process on a signal received by the characteristic variable antenna, an ADC unit configured to sample the analog signal input from the RF unit at a sampling period corresponding to the variable timing of the antenna characteristics of the characteristic variable antenna, a signal dividing unit configured to divide the digital signal input from the ADC unit into different digital signals in accordance with the antenna characteristics and output the divided different digital signals, a MIMO-OFDM demodulation unit configured to receive inputs of the different digital signals divided by the signal dividing unit and perform a demodulation process of predetermined MIMO-OFDM, and a control unit configured to periodically select or switch the antenna characteristics of the characteristic variable antenna in accordaType: ApplicationFiled: October 18, 2019Publication date: February 3, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Toshiro NAKAHIRA, Riku OMIYA, Koichi ISHIHARA, Takafumi HAYASHI
-
Publication number: 20210392524Abstract: Provided is a wireless base station which uses distributed antennas and selects a combination of a plurality of wireless terminals and the distributed antennas of a wireless base station that performs multi-user transmission with respect to the plurality of wireless terminals in a multi-BSS wireless environment. The wireless base station includes: a scheduling unit that measures reception power (RSSI) from each wireless terminal at each of the distributed antennas and selects a combination of a plurality of wireless terminals and a plurality of antennas having approximately the same RSSIs in descending order for respective wireless terminals; and a transmission power control unit that sets minimum transmission power corresponding to the RSSI of the antenna when multi-user transmission is performed between the plurality of wireless terminals and the plurality of antennas combined by the scheduling unit.Type: ApplicationFiled: August 13, 2019Publication date: December 16, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Koichi ISHIHARA, Tomoki MURAKAMI, Hirantha ABEYSEKERA, Toshiro NAKAHIRA, Yasushi TAKATORI, Takafumi HAYASHI
-
Publication number: 20210258047Abstract: 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.Type: ApplicationFiled: May 3, 2021Publication date: August 19, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Yusuke ASAI, Riichi KUDO, Koichi ISHIHARA, Masato MIZOGUCHI, Takeo ICHIKAWA
-
Patent number: 11025313Abstract: 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.Type: GrantFiled: August 10, 2020Date of Patent: June 1, 2021Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki Murakami, Yusuke Asai, Riichi Kudo, Koichi Ishihara, Masato Mizoguchi, Takeo Ichikawa
-
Patent number: 11005545Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.Type: GrantFiled: January 25, 2018Date of Patent: May 11, 2021Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki Murakami, Koichi Ishihara, Yasushi Takatori, Hirantha Abeysekera, Mamoru Akimoto, Masato Mizoguchi
-
Publication number: 20210037448Abstract: [Problem] In a terminal station and a base station, in which a plurality of wireless communication units supporting different communication performances are mounted, it is possible to select and switch wireless communication unit which responds to a congested condition of wireless communication and a wireless communication quality, and further improves a wireless resource usage efficiency.Type: ApplicationFiled: February 12, 2019Publication date: February 4, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Toshiro NAKAHIRA, Tomoki MURAKAMI, Koichi ISHIHARA, Mamoru AKIMOTO, Takafumi HAYASHI
-
Publication number: 20200373974Abstract: 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.Type: ApplicationFiled: August 10, 2020Publication date: November 26, 2020Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Yusuke ASAI, Riichi KUDO, Koichi ISHIHARA, Masato MIZOGUCHI, Takeo ICHIKAWA
-
Patent number: 10827436Abstract: Provided are n antennas and n power change units; a power control unit; a power change management unit managing a common power change amount and an individual power change amount; a common power notification unit notifying the power control unit of the common power change amount in accordance with a target terminal; an individual power notification unit notifying the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, in which the power control unit stores the individual power change amount in a storage unit, and performs control of power changing by adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount.Type: GrantFiled: January 25, 2018Date of Patent: November 3, 2020Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki Murakami, Koichi Ishihara, Yasushi Takatori, Hirantha Abeysekera, Mamoru Akimoto
-
Patent number: 10778296Abstract: 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.Type: GrantFiled: October 8, 2019Date of Patent: September 15, 2020Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki Murakami, Yusuke Asai, Riichi Kudo, Koichi Ishihara, Masato Mizoguchi, Takeo Ichikawa
-
Patent number: 10674483Abstract: In a wireless communication system in which an AP and a plurality of STAs are connected to each other and the AP simultaneously transmits a wireless frame destined for each STA with FDMA, in which the AP includes a control frame transmission unit that generates a control frame having information on a frequency resource allocated to the each STA and transmits the control frame on a primary channel being used in a shared manner by the each STA and a wireless frame transmission unit that simultaneously transmits the wireless frame destined for the each STA on the frequency resource allocated to the each STA, and in which the STA includes a frequency resource selection reception unit that receives the control frame on the primary channel and receives a wireless frame destined for the STA itself on a frequency resource notified by the control frame.Type: GrantFiled: March 4, 2016Date of Patent: June 2, 2020Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shoko Shinohara, Yasuhiko Inoue, Yasushi Takatori, Koichi Ishihara, Yusuke Asai, Masato Mizoguchi
-
Patent number: 10602367Abstract: A wireless communication apparatus is provided that is capable of performing setting of a wireless LAN access point so that frequency utilization efficiency of an entire wireless communication system that includes wireless LAN access points of different manufacturers and different model numbers is improved.Type: GrantFiled: November 12, 2013Date of Patent: March 24, 2020Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hirantha Sithira Abeysekera, Koichi Ishihara, Yasuhiko Inoue, Yusuke Asai, Yasushi Takatori, Takeo Ichikawa, Masato Mizoguchi, Munehiro Matsui
-
Publication number: 20200076482Abstract: 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.Type: ApplicationFiled: October 8, 2019Publication date: March 5, 2020Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Yusuke ASAI, Riichi KUDO, Koichi ISHIHARA, Masato MIZOGUCHI, Takeo ICHIKAWA
-
Publication number: 20190394653Abstract: The each AP includes a control unit that detects, as the wireless environment information, a signal detection level for one or more neighboring APs positioned in the neighborhood of the AP and notifies the detected signal detection level to the central coordinator, and controls the ATT value by the setting in the central coordinator; and the central coordinator includes a parameter calculation unit that calculates the ATT value for each the APs, based on the signal detection level for each the neighboring wireless access point notified from the plurality of APs and based on an RSSI threshold at which each the APs is able to secure a prescribed service area.Type: ApplicationFiled: January 25, 2018Publication date: December 26, 2019Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hirantha ABEYSEKERA, Tomoki MURAKAMI, Koichi ISHIHARA, Mamoru AKIMOTO, Yasushi TAKATORI
-
Publication number: 20190387482Abstract: Provided are n antennas and n power change units; a power control unit; a power change management unit managing a common power change amount and an individual power change amount; a common power notification unit notifying the power control unit of the common power change amount in accordance with a target terminal; an individual power notification unit notifying the power control unit in advance of the individual power change amount in accordance with the each terminal at a prescribed timing, in which the power control unit stores the individual power change amount in a storage unit, and performs control of power changing by adding up the common power change amount in accordance with the target terminal, which is notified from the common power notification unit, and the individual power change amount.Type: ApplicationFiled: January 25, 2018Publication date: December 19, 2019Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Koichi ISHIHARA, Yasushi TAKATORI, Hirantha ABEYSEKERA, Mamoru AKIMOTO
-
Publication number: 20190386724Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.Type: ApplicationFiled: January 25, 2018Publication date: December 19, 2019Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki MURAKAMI, Koichi ISHIHARA, Yasushi TAKATORI, Hirantha ABEYSEKERA, Mamoru AKIMOTO, Masato MIZOGUCHI
-
Patent number: 10491274Abstract: 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.Type: GrantFiled: November 9, 2018Date of Patent: November 26, 2019Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoki Murakami, Yusuke Asai, Riichi Kudo, Koichi Ishihara, Masato Mizoguchi, Takeo Ichikawa