公开(公告)号：US20230055133A1

公开(公告)日：2023-02-23

申请号：US17797883

申请日：2020-03-02

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Hayato FUKUZONO ,  Keita KURIYAMA ,  Masafumi YOSHIOKA ,  Takafumi HAYASHI

IPC分类号： H04B7/0413 ,  H04L25/02 ,  H04L27/26

摘要： A transmission apparatus including the number of antennas different from a reception apparatus and performing transmission by SC-MIMO to and from the reception apparatus includes a training signal generation unit that generates a known signal predetermined, a CP addition unit that adds a CP to each symbol of a transmission signal including the known signal, a weight generation unit that generates a transmission weight based on a transposed adjugate matrix that is a product of a channel matrix estimated based on the known signal by the reception apparatus and a complex conjugate transpose of the channel matrix, and a transmission beam formation unit that uses the transmission weight to form a transmission beam for the transmission signal where the CP is added.

公开(公告)号：US20220330116A1

公开(公告)日：2022-10-13

申请号：US17616735

申请日：2019-06-21

申请人： Nippon Telegraph and Telephone Corporation

发明人： Hirantha Abeysekera ,  Toshiro Nakahira ,  Takafumi HAYASHI

IPC分类号： H04W36/06 ,  H04W16/10 ,  H04W16/14 ,  H04W36/00 ,  H04W72/04

摘要： In a wireless communication system wherein wireless stations transmit on a shared frequency band, each of the wireless station includes means for notifying a control device of environmental information that includes information on interference from outside, and for switching from an operational channel to an evacuation channel notified by the control device when interference from outside is detected on the operational channel, and the control device includes means for calculating an evacuation channel for each wireless station according to a predetermined control procedure based on the environmental information collected from the wireless station, and for notifying the wireless station of the evacuation channel.

公开(公告)号：US20220217504A1

公开(公告)日：2022-07-07

申请号：US17603390

申请日：2020-04-13

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yasuhiko INOUE ,  Shoko SHINOHARA ,  Takafumi HAYASHI

IPC分类号： H04W4/06 ,  H04L1/00 ,  H04L5/00 ,  H04W74/08

摘要： A wireless communication system includes a plurality of transmission devices configured to receive broadcast/multicast data transmitted from a broadcast/multicast data transmission device, convert the broadcast/multicast data into wireless frames, and broadcast/multicast the wireless frames to a plurality of reception devices, and the plurality of reception devices configured to receive the wireless frames broadcasted/multicasted from the plurality of transmission devices and acquire the broadcast/multicast data, and each of the plurality of transmission devices includes a broadcast/multicast transmission unit configured to generate the same wireless frame from the broadcast/multicast data and broadcast/multicast the generated wireless frame at the same transmission timing using the same MCS.

公开(公告)号：US20220191931A1

公开(公告)日：2022-06-16

申请号：US17439892

申请日：2020-03-11

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC分类号： H04W74/08 ,  H04L5/00

摘要： 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

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC分类号： H04W16/18 ,  H04W16/24

摘要： 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

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

摘要： 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：US20240031872A1

公开(公告)日：2024-01-25

申请号：US18023886

申请日：2020-09-03

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Masafumi YOSHIOKA ,  Hayato FUKUZONO ,  Keita KURIYAMA ,  Takafumi HAYASHI

IPC分类号： H04W28/18 ,  H04L1/00

CPC分类号： H04W28/18 ,  H04L1/0003

摘要： A base station is wirelessly connected to each of a plurality of subscriber stations accommodating one or more terminals and includes a detection unit configured to detect at least one of a change in the number of terminals in communication accommodated by each of the subscriber stations and a change in a radio wave environment with each of the subscriber stations; and a setting unit configured to set a modulation scheme of a minimum modulation order in which a total communication amount of all the terminals that perform communication is accommodatable for each of the subscriber stations in each of the subscriber stations based on the change detected by the detection unit and to set weighting of radio wave intensity in each of the subscriber stations so that communication quality in the modulation scheme of the minimum modulation order is maximized.

公开(公告)号：US20230275839A1

公开(公告)日：2023-08-31

申请号：US18008275

申请日：2020-06-08

申请人： Nippon Telegraph and Telephone Corporation

发明人： Fumiaki Nagase ,  Keita Kuriyama ,  Yu Ono ,  Hitoshi Hasegawa ,  Hayato Fukuzono ,  Kazuo OSAKA ,  Hiroyuki Furuya ,  Masafumi YOSHIOKA ,  Toshifumi MIYAGI ,  Takafumi HAYASHI

IPC分类号： H04L47/24

CPC分类号： H04L47/24

摘要： To avoid uniform deterioration of the voice quality of all the calls sharing an IP phone line at a time of congestion. The congestion control method in an IP phone system includes a call state acquisition process of acquiring the number of simultaneous call sessions in one line shared by a plurality of IP phones. A congestion control method further includes a packet loss control process of setting a priority ranking to each call session and dynamically controlling packet loss rates of the call sessions in accordance with the number of the simultaneous call sessions and the priority ranking. In the packet loss control process, the packet loss rate is set lower for call sessions ranked higher in priority, and higher for call sessions ranked lower in priority.

公开(公告)号：US20220216930A1

公开(公告)日：2022-07-07

申请号：US17600563

申请日：2020-03-24

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

摘要： 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

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

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

摘要： 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.