公开(公告)号：US20220225336A1

公开(公告)日：2022-07-14

申请号：US17440960

申请日：2020-03-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yohei KATAYAMA ,  Kenji SUZUKI ,  Kazumitsu SAKAMOTO ,  Yosuke FUJINO ,  Hiroyuki FUKUMOTO

IPC: H04W72/08

Abstract: A communication control device that transmits a packet to be transmitted to a terminal to a base station that performs wireless communication with the terminal, includes: a terminal classification unit that classifies, on the basis of a magnitude of radio wave interference from a base station different from a neighboring base station, a plurality of the terminals into a first terminal set and a second terminal set that is relatively larger in the magnitude of radio wave interference than the first terminal set; and a transmission unit that transmits, in a case where packets destinations of which are terminals belonging to the first terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at the same timing and transmits, in a case where packets destinations of which are terminals belonging to the second terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at timings different from each other.

公开(公告)号：US20210119685A1

公开(公告)日：2021-04-22

申请号：US16965959

申请日：2019-02-01

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yosuke FUJINO ,  Hiroyuki FUKUMOTO ,  Hajime KATSUDA ,  Kazunori AKABANE

IPC: H04B7/06 ,  H04B1/00 ,  H04B1/7085

Abstract: A transmission device includes a modulation unit that performs chirp-spread modulation on an input information series to generate a modulation signal; a delay unit that provides, to a plurality of modulation signals obtained by duplicating the modulation signal generated by the modulation unit, delays having lengths different from each other, a difference between the delays being an integral multiple of a reciprocal of a bandwidth of the modulation signal; and a plurality of transmission antennas that transmit the plurality of modulation signals, respectively, to which the delays are provided by the delay unit.

公开(公告)号：US20210021053A1

公开(公告)日：2021-01-21

申请号：US17043133

申请日：2019-03-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hirofumi SASAKI ,  Doohwan LEE ,  Hiroyuki FUKUMOTO ,  Hiroyuki SHIBA

IPC: H01Q21/20 ,  H04L27/36 ,  H04J99/00 ,  H04B7/0456

Abstract: An OAM multiplexing communication system uses one or more OAM modes and multiplexes signals of one or more sequences for each OAM mode. A transmitting station includes a transmitting antenna using an M-UCA, and an OAM mode generation unit that simultaneously generates one or more OAM modes from each UCA. A receiving station includes a receiving antenna equivalent to the M-UCA, an OAM mode separation unit that separates signals received by each UCA for each OAM mode, and a received signal processing unit that estimates channel information for each OAM mode and performs an equalization process for each OAM mode by using a receiving weight calculated from the channel information. The received signal processing unit is configured to estimate, for each OAM mode, channel information of another OAM mode causing interference and calculate the receiving weight of a subject OAM mode by using the channel information of the subject OAM mode and said another OAM mode.

公开(公告)号：US20220353009A1

公开(公告)日：2022-11-03

申请号：US17762651

申请日：2019-09-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Marina NAKANO ,  Yosuke FUJINO ,  Hiroyuki FUKUMOTO ,  Kazunori AKABANE

IPC: H04L1/00 ,  H04B7/0413

Abstract: Provided is a radio communication system including a radio transmission apparatus including a plurality of transmission antennas and a radio reception apparatus including a plurality of reception antennas. The radio transmission apparatus includes a communication distance measurement unit configured to measure a distance between the plurality of transmission antennas and the plurality of reception antennas, a selection unit configured to select a modulation scheme common to all frequency channels indicating an orthogonality between the plurality of transmission antennas and the plurality of reception antennas, the modulation scheme satisfying an average value of index values for each of the frequency channels according to the distance between the plurality of transmission antennas and the plurality of reception antennas and satisfying a predetermined desired bit error rate, a transmission signal generation unit configured to separate transmission data into the number of all the frequency channels, modulate each item of the separated transmission data by the selected common modulation scheme, and output the transmission signals multiplexed by the number of multiplexing indicating the number of the plurality of transmission antennas to be used, and a radio signal transmitting unit. The radio reception apparatus includes a demodulation unit configured to demodulate a reception signal received by each of the plurality of reception antennas by a demodulation scheme corresponding to the modulation scheme to generate reception data.

公开(公告)号：US20220322212A1

公开(公告)日：2022-10-06

申请号：US17596077

申请日：2019-06-06

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazumitsu SAKAMOTO ,  Kenji SUZUKI ,  Yohei KATAYAMA ,  Yosuke FUJINO ,  Hiroyuki FUKUMOTO

IPC: H04W48/16 ,  H04W16/18 ,  H04W48/14

Abstract: A communication quality calculation unit (11) of a base station placement design device (1) calculates communication quality of each terminal in a case where a base station is installed at a base station placement candidate location for a plurality of base station placement candidate locations. An aggregation unit (12) aggregate the number of terminals whose communication quality calculated by the communication quality calculation unit (11) is equal to or greater than a threshold value for each of the plurality of base station placement candidate locations. A base station placement location selection unit (13) selects a base station placement location from among the plurality of base station placement candidate locations, based on the number of terminals aggregated by the aggregation unit (12) for each of the plurality of base station placement candidate locations.

公开(公告)号：US20220174520A1

公开(公告)日：2022-06-02

申请号：US17437196

申请日：2020-03-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazumitsu SAKAMOTO ,  Kenji SUZUKI ,  Yohei KATAYAMA ,  Yosuke FUJINO ,  Hiroyuki FUKUMOTO

IPC: H04W24/08 ,  H04B17/318 ,  H04L43/0894

Abstract: An arrival rate estimation device includes an average received power calculation unit that calculates an average received power for each mesh that constitutes an area, with respect to each of a plurality of base stations and each of a plurality of antennas included in each of the base stations and an arrival rate estimation unit that calculates a communication arrival rate by substituting the average received power into a cumulative distribution function of an instantaneous received power value, and based on the calculated communication arrival rate, calculates a communication arrival rate while giving consideration to a site diversity effect and an antenna diversity effect, the cumulative distribution function being obtained from a probability density function of an amplitude that instantaneously changes due to Rayleigh fading.

公开(公告)号：US20220131778A1

公开(公告)日：2022-04-28

申请号：US17434917

申请日：2020-03-10

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Yohei Katayama ,  Kenji Suzuki ,  Kazumitsu Sakamoto ,  Yosuke Fujino ,  Hiroyuki FUKUMOTO

IPC: H04L43/0817 ,  G06F11/30

Abstract: A monitoring system comprises a monitoring agent that keeps information related to a communication status of a low-power terminal that communicates under low power, and a monitoring device that monitors the status of the low-power terminal. The monitoring device includes a requesting unit that requests information related to the communication status of the low-power terminal. The monitoring agent includes a response generation unit that generates a response to the request from the monitoring device on a basis of the information related to the communication status of the low-power terminal, and a transmission unit that transmits the response to the monitoring device.

公开(公告)号：US20240259113A1

公开(公告)日：2024-08-01

申请号：US18561251

申请日：2021-05-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroyuki FUKUMOTO ,  Yosuke FUJINO ,  Toshimitsu TSUBAKI ,  Miharu OIWA ,  Yuya ITO ,  Marina NAKANO

IPC: H04B11/00 ,  H04B13/02

CPC classification number: H04B11/00 ,  H04B13/02

Abstract: According to an aspect of the present invention, there is provided a communication apparatus including: a synchronizer configured to perform synchronization processing according to a Doppler shift on a reception signal; and an equalizer configured to perform equalization processing on a reception signal on which the synchronization processing has been performed, in which the synchronizer includes a correlator configured to output a correlation between a reception signal and a known preamble sequence and a correlation between the reception signal and a known postamble sequence, a slide correlator configured to output a sliding correlation based on an output of the correlator, and a Doppler estimator configured to estimate a Doppler shift based on the sliding correlation of the slide correlator

公开(公告)号：US20230291479A1

公开(公告)日：2023-09-14

申请号：US18011585

申请日：2020-06-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Yohei KATAYAMA ,  Kazumitsu SAKAMOTO ,  Kento YOSHIZAWA ,  Hiroyuki FUKUMOTO ,  Takuya OHARA ,  Takeshi KINOSHITA ,  Etsushi YAMAZAKI ,  Takayuki MIZUNO

IPC: H04B10/508 ,  H04B10/11

CPC classification number: H04B10/508 ,  H04B10/11

Abstract: A communication device includes: a light output unit for outputting light; a light splitting unit for splitting the light output by the light output unit into a plurality of split beams; and a plurality of spatial optical communication units provided in correspondence to the plurality of split beams, wherein the spatial optical communication units respectively transmit a corresponding split beam which is input from the light splitting unit to a partner communication device across space.

公开(公告)号：US20220240101A1

公开(公告)日：2022-07-28

申请号：US17596404

申请日：2019-06-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kazumitsu SAKAMOTO ,  Kenji SUZUKI ,  Yohei KATAYAMA ,  Yosuke FUJINO ,  Hiroyuki FUKUMOTO

IPC: H04W16/18 ,  H04W24/02

Abstract: A station installation designing assistance device that divides a service providing area into a plurality of areas, and performs station installation designing for the plurality of areas in parallel, the station installation designing assistance device including: an area dividing unit that divides an entirety of the service providing area into a plurality of areas that are each composed of a predetermined number of small areas; a small area specifying unit that specifies a small area number that identifies a small area in each of the areas, where the same number is given to the small area in each of the areas; and a station installation location selecting unit that selects, for each of the plurality of areas, a plurality of station installation locations from among station installation location candidates that are present in the small area specified by the small area specifying unit.