公开(公告)号：US20220191931A1

公开(公告)日：2022-06-16

申请号：US17439892

申请日：2020-03-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04W74/08 ,  H04L5/00

Abstract: A wireless communications method for connecting a base station with each of a plurality of terminal stations, the base station being equipped with a plurality of wireless communications units each configured to be able to selectively enable or disable an RTS/CTS function and a NoACK function and connectable with one or more of the terminal stations, includes: a collection step of collecting information as to whether each of the terminal stations is a hidden terminal and information about transmission characteristics of each of the terminal stations; a policy calculation step of calculating a setting policy for enabling or disabling the RTS/CTS function and the NoACK function 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 the collected information; 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.

公开(公告)号：US20220141672A1

公开(公告)日：2022-05-05

申请号：US17435488

申请日：2020-02-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Riku OMIYA ,  Toshiro NAKAHIRA ,  Hirantha ABEYSEKERA ,  Shoko SHINOHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04W16/18 ,  H04W16/24

Abstract: A wireless base station setting position calculation method includes a step Si for assuming the setting area to be a rectangle, receiving an input of longitudinal and lateral lengths of a setting area and the number of wireless base stations to be set “s”, and determining one or more candidates of a number of divisions “d” of the setting area according to the number of wireless base stations “s”, a step S2 for representing the number of divisions “d” in a division ratio x:y and selecting, for each number of divisions “d”, according to the longitudinal and lateral lengths of the setting area, a division ratio at which diagonal line lengths of divided areas are minimized, a step S3 for performing, for each number of divisions “d”, adjustment of a division pattern until a difference m between the number of divisions “d” and the number of wireless base stations “s” decreases to 0, a step S4 for calculating, for each number of divisions “d”, a sum of the diagonal line lengths of the divided areas and selecting the division pattern with which the sum is minimized, and a step S5 for setting the wireless base stations in the centers of gravity of the divided areas in the division pattern selected in step S4.

公开(公告)号：US20210392524A1

公开(公告)日：2021-12-16

申请号：US17269285

申请日：2019-08-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Koichi ISHIHARA ,  Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Toshiro NAKAHIRA ,  Yasushi TAKATORI ,  Takafumi HAYASHI

IPC: H04W24/08 ,  H04B7/024 ,  H04W52/36 ,  H04B7/0452

Abstract: 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.

公开(公告)号：US20210076369A1

公开(公告)日：2021-03-11

申请号：US16976458

申请日：2019-02-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Akiyoshi INOKI ,  Keisuke WAKAO

IPC: H04W72/04 ,  H04W28/16 ,  H04W72/08

Abstract: [Problem] A base station includes a plurality of radio communication units individually supporting a plurality of communication capabilities, and controls a terminal station to be connected with the base station to select a radio communication unit according to a communication scheme of the terminal station.
[Solution] Provided is a radio communication method of a radio communication system. The radio communication system includes a plurality of base stations mounted with a plurality of radio communication units for which different communication schemes are settable, a terminal station configured to perform radio communication in a certain communication scheme, and a centralized control station configured to control the plurality of base stations. The radio communication method includes calculating, by the centralized control station, a setting policy of a communication scheme for each of the plurality of radio communication units of each of the plurality of base stations and a switching policy for the terminal station and the radio communication unit, and notifying the base station of the policies, setting, by the base station, the setting policy and the switching policy, notified from the centralized control station, for the radio communication unit, collecting, by the base station, communication scheme information of communication schemes selectable by the terminal station from the terminal station to be connected, and selecting, by the base station, a radio communication unit to be connected by the terminal station in accordance with the communication scheme information, the setting policy, and the switching policy.

公开(公告)号：US20190386724A1

公开(公告)日：2019-12-19

申请号：US16480122

申请日：2018-01-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Koichi ISHIHARA ,  Yasushi TAKATORI ,  Hirantha ABEYSEKERA ,  Mamoru AKIMOTO ,  Masato MIZOGUCHI

IPC: H04B7/06 ,  H04W72/04 ,  H04W68/00

Abstract: 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.

公开(公告)号：US20230362828A1

公开(公告)日：2023-11-09

申请号：US17911570

申请日：2020-03-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Yasushi TAKATORI

IPC: H04W52/24

CPC classification number: H04W52/24 ,  H04W88/08

Abstract: A communication control method for controlling transmission powers transmitted by a plurality of base stations in a coverage area, the coverage area being covered by the plurality of base stations includes setting a transmission power of each base station to a maximum, calculating, for each base station, a percentage of an individual coverage area with respect to the coverage area when the transmission power of each base station is set to the maximum, the individual coverage area serving as a range in which each base station individually accommodates a terminal station, reducing, when a maximum value of the calculated percentages deviates from an average value by a predetermined value or greater, the transmission power of any of the plurality of base stations with the maximum percentage value, newly calculating, for each base station, a percentage of the individual coverage area with respect to the coverage area, and continuing the control until the maximum value of the calculated percentages deviates from the average value by less than the predetermined value.

公开(公告)号：US20230142888A1

公开(公告)日：2023-05-11

申请号：US17796137

申请日：2020-01-28

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Hirantha ABEYSEKERA ,  Toshiro NAKAHIRA ,  Shoko SHINOHARA ,  Koichi ISHIHARA ,  Yasushi TAKATORI

IPC: H04W48/06

CPC classification number: H04W48/06

Abstract: In a wireless communication system including a plurality of base stations to which one or more terminal stations are connectable, and a base station control device which controls each of the base stations, the base station control device includes an information collection unit configured to collect connection information regarding the terminal stations connected to the base stations from each of the base stations, a list generation unit configured to generate a white list indicating the terminal stations which are allowed to be connected to the base stations for each of the base stations based on the connection information, and a transmission unit configured to transmit the white list generated by the list generation unit to each of the base stations, and each of the base stations includes a reception unit configured to receive the white list transmitted by the transmission unit, and a setting unit configured to perform setting so as to allow or inhibit connection of each of the terminal stations to the base station based on the white list received by the reception unit.

公开(公告)号：US20220299620A1

公开(公告)日：2022-09-22

申请号：US17636558

申请日：2020-08-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tomoki MURAKAMI ,  Hirantha ABEYSEKERA ,  Shunsuke SARUWATARI ,  Takeru FUKUSHIMA ,  Yusuke IWASAKI ,  Takashi WATANABE

IPC: G01S13/06 ,  G01S5/02 ,  G02B30/56

Abstract: A spatial image generation apparatus includes: a propagation channel information measurer that measures propagation channel information of a target area from radio signals delivered between transmitting and receiving stations; a learned model generator that generates a learned model for generating a spatial image of the target area from the newly input propagation channel information using the propagation channel information and image information obtained by imaging the target area with a camera; and an image generator that generates the spatial image of the target area by inputting the propagation channel information newly input from the propagation channel information measurer to the learned model. The object detection apparatus includes: the spatial image generation apparatus; and an object detector that detects an object in the target area from the spatial image generated by the image generator using an image analysis method.

公开(公告)号：US20220216930A1

公开(公告)日：2022-07-07

申请号：US17600563

申请日：2020-03-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shoko SHINOHARA ,  Toshiro NAKAHIRA ,  Yasuhiko INOUE ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04B17/318 ,  H04W24/10 ,  H04B17/391

Abstract: A wireless communication characteristic evaluation method for calculating a wireless communication characteristic of a wireless communication system in which a plurality of wireless communication terminals perform communication by transmitting or exchanging signals includes: an RSSI measurement step of measuring an RSSI measurement used for calculation of the wireless communication characteristic; and a calculation step of calculating the wireless communication characteristic based on the RSSI measurement and correction data of the RSSI measurement according to specifications of the wireless communication terminals or a correction calculation model.

公开(公告)号：US20220150715A1

公开(公告)日：2022-05-12

申请号：US17440314

申请日：2020-03-16

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Toshiro NAKAHIRA ,  Hirantha ABEYSEKERA ,  Koichi ISHIHARA ,  Takafumi HAYASHI ,  Yasushi TAKATORI

IPC: H04W16/20 ,  H04B17/391 ,  H04B17/27 ,  H04W84/12

Abstract: 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.