公开(公告)号：US20200053774A1

公开(公告)日：2020-02-13

申请号：US16498869

申请日：2018-03-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Akiyoshi INOKI ,  Hirantha ABEYSEKERA ,  Munehiro MATSUI ,  Kenichi KAWAMURA ,  Yasushi TAKATORI ,  Takeo ICHIKAWA ,  Akira KISHIDA ,  Yoshifumi MORIHIRO ,  Takahiro ASAI

IPC: H04W74/08

Abstract: An AP and UE, which perform access control using CSMA/CA, perform a step judging an exposed level in transmission of the AP based on a congesting level in transmission, which is caused by a wireless station in defer transmission that is in a neighborhood of the AP; a step judging an exposed level in reception of the UE based on a congesting level in reception, which is caused by a wireless station in defer transmission that is in a neighborhood of the UE; and a step performing control which changes a channel of the AP, when the exposed level in transmission cannot satisfy expected quality of the AP, and performing control which changes a connected AP of the UE, or control which changes to other network, when the exposed level in transmission or in reception cannot satisfy required quality of the UE or the expected quality of the AP.

公开(公告)号：US20230102173A1

公开(公告)日：2023-03-30

申请号：US17911360

申请日：2020-03-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W24/10 ,  H04B17/318

Abstract: According to an information processing method of associating a plurality of base stations serving as transmission sources with pieces of information of beacons in a one-to-one manner, the beacons being transmitted by the plurality of base stations in an environment in which cells of the plurality of base stations overlap each other and measured at a plurality of measurement locations, the method includes performing first processing of associating an MAC address and a signal intensity of a beacon transmitted by one or more of the base stations with each of the measurement locations, performing second processing of associating, as a transmission source candidate of the beacon, one or more of the base stations located around each of the measurement locations that have undergone the first processing with the measurement location in ascending order of distance to the measurement location, performing third processing of associating one of the base stations closest to each of the measurement locations as a transmission source with the MAC address of the beacon having a strongest signal intensity after the second processing is performed, excluding the associated MAC address and base station after the second processing is performed, and associating one of the base stations closest to each of the measurement locations as a transmission source with the MAC address of the beacon having a strongest signal intensity.

公开(公告)号：US20230034313A1

公开(公告)日：2023-02-02

申请号：US17791199

申请日：2020-01-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W16/04 ,  H04W28/02 ,  H04W28/08

Abstract: In a wireless communication system including an intermediate processing device which performs processing between a plurality of base stations to which terminal stations are connectable and a base station control device which controls each of the base stations, the intermediate processing device includes an information collection unit configured to collect wireless environment information which includes information regarding the terminal stations connected to the base stations and which indicates wireless environments around the base stations and the terminal stations, from each of the base stations, a first conversion unit configured to convert the wireless environment information collected by the information collection unit into first information which is equally processable by the base station control device without distinction for each of the base stations, a transmission unit configured to transmit the first information to the base station control device, a reception unit configured to receive a parameter calculated by the base station control device based on the first information, and a second conversion unit configured to convert the parameter received by the reception unit into individual second information in accordance with each of the base stations, and each of the base stations includes a reception unit configured to receive the second information and a setting unit configured to perform setting so as to perform communication with each of the terminal stations based on the second information.

公开(公告)号：US20220225137A1

公开(公告)日：2022-07-14

申请号：US17600522

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: H04W24/08 ,  H04B17/345 ,  H04B17/336

Abstract: A wireless communication characteristics evaluation method for evaluating wireless communication characteristics of a wireless communication system where a plurality of wireless communication terminals perform communication by transmitting or exchanging signals, the wireless communication characteristics evaluation method including: a step 1 of acquiring power and a band of an interference signal; a step 2 of calculating an interference band rate showing a rate of the band of the interference signal that overlaps with a band of a desired signal; a step 3 of calculating an interference power rate from interference power and the interference band rate and furthermore, calculating steady noise power from the interference power and the interference power rate; a step 4 of determining a real SINR from received power of the desired signal and the steady noise power; and a step 5 of determining wireless communication characteristics of the desired signal from the real SINR.

公开(公告)号：US20220217545A1

公开(公告)日：2022-07-07

申请号：US17600574

申请日：2020-03-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W16/22 ,  H04B17/373 ,  H04B17/391 ,  H04B17/309

Abstract: A station installation support system for performing a station installation design of a wireless base station satisfying a required performance and a parameter design includes a station installation support device that acquires a station installation calculation condition required to calculate a station installation of the wireless base station, a parameter calculation condition required to calculate a parameter of the wireless base station, a wireless performance evaluation condition required to evaluate a wireless performance, and a station installation evaluation condition required to evaluate the station installation and performs the station installation design and the parameter design, a wireless signal evaluation unit that outputs a wireless signal evaluation result corresponding to wireless signal evaluation information, a station installation calculation unit that outputs a station installation calculation result corresponding to station installation calculation information, a parameter calculation unit that outputs a parameter calculation result corresponding to parameter calculation information, and a wireless performance evaluation unit that outputs a wireless performance evaluation result corresponding to wireless performance evaluation information.

公开(公告)号：US20220201602A1

公开(公告)日：2022-06-23

申请号：US17603668

申请日：2020-04-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W48/18 ,  H04L41/0893 ,  H04W8/22 ,  H04W28/08

Abstract: A radio communication method of connecting a base station with a plurality of terminal stations, the base station including a plurality of radio communication units compatible with a plurality of communication standards or communication schemes, the method including collecting, from each of the plurality of terminal stations, communication quality information representing a communication quality of the terminal station, collecting, from each of the plurality of terminal stations, communication performance information representing a communication performance of the terminal station, collecting, from each of the plurality of terminal stations, identifier information that identifies the terminal station, calculating, based on the communication quality information, the communication performance information and the identifier information that are collected, a setting policy including a setting for each of the plurality of radio communication units, and a switching policy of setting a condition for switching the plurality of radio communication units, and setting, for each of the plurality of radio communication units, the terminal station to be connected based on the setting policy and the switching policy that are calculated.

公开(公告)号：US20220191076A1

公开(公告)日：2022-06-16

申请号：US17439851

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: H04L27/26 ,  H04L5/00 ,  H04W16/28

Abstract: A wireless communication method for connecting a base station with each of a plurality of terminal stations set to differ in Guard interval length, with the base station being equipped with a plurality of wireless communications units each configured to be connectable with one or more of the terminal stations, includes: a collection step of collecting information about the Guard interval length set for each of the terminal stations and connection information about the terminal stations; a policy calculation step of calculating a setting policy for setting the Guard interval length 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 of the collected information about the Guard interval length and connection information about the terminal stations; 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：US20220159644A1

公开(公告)日：2022-05-19

申请号：US17435290

申请日：2020-02-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W72/04

Abstract: In a wireless communication system in which a plurality of wireless stations perform transmission on a shared frequency band, the wireless stations each include means for notifying a wireless station control apparatus of capability and environment information that includes information about capability of a local wireless station and information about a surrounding environment, and the wireless station control apparatus includes control means for selecting, based on capability and environment information. collected from the wireless station, a frequency band to be used for the wireless station capable of using a plurality of frequency bands in accordance with a predetermined control index and setting the selected frequency band. Based on an area coverage rate of the wireless station as the control index, a frequency band with which. an area coverage rate of the wireless station having an area coverage rate of less than or equal to a predetermined threshold is improved is selected.

公开(公告)号：US20190394653A1

公开(公告)日：2019-12-26

申请号：US16480039

申请日：2018-01-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W16/10 ,  H04W24/02 ,  H04W28/24

Abstract: 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.

公开(公告)号：US20230113366A1

公开(公告)日：2023-04-13

申请号：US17796138

申请日：2020-01-28

Applicant: Nippon Telegraph and Telephone Corporation

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

IPC: H04W36/24 ,  H04W36/08

Abstract: In a wireless communication system including a plurality of base stations to which 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 wireless environment information indicating wireless environments around the base stations and the terminal stations from each of the base stations, and a policy calculation unit configured to calculate policy for connecting the base stations and the terminal stations based on the wireless environment information collected by the information collection unit, each of the base stations includes a reception unit configured to receive the policy calculated by the policy calculation unit, a transition destination calculation unit configured to calculate a transition destination to which a terminal station left unaccommodated is to be connected based on the policy received by the reception unit, and a transmission unit configured to transmit the policy received by the reception unit and the transition destination calculated by the transition destination calculation unit to the terminal station, and each of the terminal stations determines a connection destination based on the policy and the transition destination transmitted by each of the base stations.