公开(公告)号：US20230170990A1

公开(公告)日：2023-06-01

申请号：US17921569

申请日：2020-05-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Hirotaka UJIKAWA ,  Shin KANEKO ,  Jun TERADA

IPC: H04B10/035 ,  H04B10/079

CPC classification number: H04B10/035 ,  H04B10/0795

Abstract: Time taken for resuming communication in a protection scheme using a backup path in an optical communication system including a master station device and a plurality of slave station devices is decreased. The plurality of slave station devices are connected in parallel to a looped path. A communication path between the master station device and each of the slave station device includes a normal path and a backup path. The master station device performs communication control processing for each of the slave station device based on RTT. A first slave station device is a slave station device with which communication through the normal path has become impossible. First backup path RTT of the first slave station device is calculated based on first normal path RTT of the first slave station device, first partial RTT between the master station device and the looped path, and loop propagation time necessary for one trip through the looped path. The communication control processing for the first slave station device is resumed based on the calculated first backup path RTT without measurement of the first backup path RTT when the first slave station device is sensed.

公开(公告)号：US20220123838A1

公开(公告)日：2022-04-21

申请号：US17431668

申请日：2020-02-14

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Hiroyuki UZAWA ,  Hirotaka NAKAMURA ,  Jun TERADA

IPC: H04B10/27

Abstract: A transfer device installed between a host device and a plurality of OLTs in a communication system to which a network with a PON configuration including the plurality of OLTs between the host device and a subordinate device is applied, the transfer device including a frame information acquisition unit configured to monitor downstream frames input from the host device and calculate a statistical value of the downstream frames per a predetermined fixed cycle, a frame storage unit including a plurality of queues each configured to store downstream frames to be transferred to the plurality of OLTs, the frame storage unit configured to store the downstream frames input from the host device, a frame sorting unit configured to input the downstream frames to the plurality of queues in the frame storage unit, and a distribution control determination unit configured to determine the number of frames to be sequentially input by the frame sort unit to the plurality of queues based on the statistical value.

公开(公告)号：US20220030500A1

公开(公告)日：2022-01-27

申请号：US17298294

申请日：2019-11-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hiroyuki UZAWA ,  Yoichi FUKADA ,  Jun TERADA

IPC: H04W40/02 ,  H04L12/707 ,  H04L12/751

Abstract: A path control method of controlling a communication path in a network including a plurality of wireless devices communicating with a terminal in a wireless manner and a plurality of wireless control devices communicating with any one of the plurality of wireless devices through a plurality of signal transfer devices includes searching for available communication paths and listing the available communication paths for individual combinations of a wireless device of the plurality of wireless devices and a wireless control device of the plurality of wireless control devices, and selecting a combination of communication paths in which a maximum value of the number of communications passing through the same output port of a signal transfer device of the plurality of signal transfer devices is minimized from among the listed available communication paths.

公开(公告)号：US20220007151A1

公开(公告)日：2022-01-06

申请号：US17291259

申请日：2019-10-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hirofumi YAMAMOTO ,  Keita TAKAHASHI ,  Noriyuki OTA ,  Jun TERADA

IPC: H04W4/06 ,  H04B7/155

Abstract: A relay device including: an information storage unit that stores conversion-target header information; a downlink signal dividing unit that divides a downlink signal received from the radio control device into a header and a payload; a signal replicating unit that makes the same number of copies of the payload of the downlink signal as the number of the plurality of destination radio devices; a downlink signal header information conversion unit that performs conversion on the header of the downlink signal for each destination radio device based on the header information stored in the information storage unit; and a signal addition assignment unit that adds the header converted by the downlink signal header information conversion unit to each of the payloads of the downlink signal replicated by the signal replicating unit, and transfers the payloads to the radio devices respectively corresponding thereto.

公开(公告)号：US20210112016A1

公开(公告)日：2021-04-15

申请号：US17057034

申请日：2019-05-08

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Hiroyuki UZAWA ,  Hirotaka NAKAMURA ,  Daisuke HISANO ,  Hirotaka UJIKAWA ,  Jun TERADA

IPC: H04L12/865

Abstract: A transfer apparatus include a distribution unit, a storage unit, and a transfer unit, in which the distribution unit is configured to identify a plurality of networks to which frames belong, distribute the frames for each of the networks based on an identification result, and store the distributed frames in the storage unit, the storage unit is configured to store information of a time at which a frame of the frames is stored in the storage unit and the frame in association with each other, and the transfer unit is configured to detect a period of time for which the frame stays in the storage unit, detect a remaining period to send which is a remaining time of a time for which the frame is permitted to stay in the storage unit, for each of the frames, based on a difference between the time for which the frame stays in the storage unit and the delay upper limit value, and output the frame to a predetermined apparatus based on the remaining period to send.

公开(公告)号：US20230155712A1

公开(公告)日：2023-05-18

申请号：US17908223

申请日：2020-03-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Hirotaka UJIKAWA ,  Shin KANEKO ,  Jun TERADA

IPC: H04J14/02 ,  H04B10/272

CPC classification number: H04J14/0206 ,  H04B10/272 ,  H04J14/0213

Abstract: A wavelength multiplexing communication system includes a master station apparatus and a plurality of slave station apparatuses. The master station apparatus includes a wavelength multiplexing communication unit that performs wavelength multiplexing communication with the plurality of slave station apparatuses by wavelengths the number of which is equal to or less than the number of the plurality of slave station apparatuses using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group. The slave station apparatuses include an optical communication unit that performs communication of the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, which is different from a wavelength in the first wavelength group used by another slave station when the main signal communication is performed in the host slave station apparatus, and performs communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, which is a wavelength same as a wavelength used by another slave station apparatus when the main signal communication is not performed in the host slave station apparatus.

公开(公告)号：US20220201536A1

公开(公告)日：2022-06-23

申请号：US17603464

申请日：2020-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Tatsuya FUKUI ,  Naotaka SHIBATA ,  Keita TAKAHASHI ,  Hideaki KIMURA ,  Noriyuki OTA ,  Hirofumi YAMAMOTO ,  Jun TERADA

IPC: H04W28/02

Abstract: An object is to provide a communication system, a communication apparatus, and a terminal apparatus capable of integrating communication paths of both of mobile access and fixed access while addition of a new function to a mobile network is reduced.
In a communication system 100 according to the present invention, a communication path of one mobile bearer between a base station master station apparatus 300 and a user gateway 600 includes a split bearer configuration including a mobile access communication path being connected from the base station master station apparatus 300 to the user gateway 600 via a mobile access slave station apparatus 400 and a non-mobile access communication path being connected from the base station master station apparatus 300 to the user gateway 600 via a non-mobile access slave station apparatus 500.

公开(公告)号：US20220116825A1

公开(公告)日：2022-04-14

申请号：US17298336

申请日：2019-11-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hiroyuki UZAWA ,  Yoichi FUKADA ,  Jun TERADA

IPC: H04W28/08 ,  H04W40/02 ,  H04W72/12

Abstract: Provided is a path control method of controlling a path of communication in a network including a high priority device dealing with high priority traffic, a high priority control device communicating with the high priority device through a plurality of signal transfer devices transferring signals by periodically repeating a high priority signal transmissible period in which high priority traffic is transmissible and a low priority signal transmissible period in which low priority traffic is transmissible, a low priority device dealing with the low priority traffic, and a low priority control device communicating with the low priority device through the plurality of signal transfer devices, the path control method including calculating a low priority signal transmissible period in each of paths between the low priority device and the low priority control device, and performing setting for switching the path between the low priority device and the low priority control device so that the low priority traffic is transmitted in any one of the calculated low priority signal transmissible periods.

公开(公告)号：US20180077686A1

公开(公告)日：2018-03-15

申请号：US15562114

申请日：2016-03-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Hiroshi OU ,  Tatsuya SHIMADA ,  Takayuki KOBAYASHI ,  Jun TERADA

IPC: H04W72/04

Abstract: Information on allocation of a bandwidth of uplink communication of each of user devices is extracted from information notified from an upper-level device on the uplink communication of the user devices. Correspondence information is created to indicate a correspondence among the upper-level device, the terminal device, the lower-level device, and the user device. A start time point of the uplink communication of the terminal device and an information amount of signals for which transmission of the uplink communication of the terminal device is allowed are allocated to the terminal device on the basis of the information on allocation of the bandwidth of the uplink communication of each of the user devices and the correspondence information.

公开(公告)号：US20180048439A1

公开(公告)日：2018-02-15

申请号：US15552724

申请日：2016-03-03

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kenji MIYAMOTO ,  Shigeru KUWANO ,  Jun TERADA

IPC: H04L5/00 ,  H04L27/26 ,  H04B7/024

CPC classification number: H04L5/0035 ,  H04B7/024 ,  H04B7/08 ,  H04L27/2601 ,  H04W16/28 ,  H04W28/16

Abstract: A wireless communication system includes distributed units communicating with a terminal device and a central unit connected to the distributed units and receiving and processing signals from the distributed units. The central unit includes a host function unit to pre-notify the distributed units if a received signal from the terminal device is a target of coordination between distributed units, hard/soft determination units configured to separate received signals from the distributed units into a hard decision value and a soft decision value based on presence or absence of coordination between the distributed units, transmit the hard decision value to the host function unit as is, and transmit the soft decision value to a signal combining unit, the signal combining unit combines soft decision values output from the hard/soft determination units and outputs a combined soft decision value, and a decoding unit performs decoding using the soft decision value output from the signal combining unit.