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1. 发明公开

US20230275682A1 COMMUNICATION DEVICE, COMMUNICATION METHOD, COMMUNICATION SYSTEM AND COMMUNICATION PROGRAM 审中-公开
公开(公告)号：US20230275682A1
公开(公告)日：2023-08-31
申请号：US18015435
申请日：2020-07-15
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Takamitsu TOCHINO , Hirotaka UJIKAWA , Hirotaka NAKAMURA
IPC分类号： H04J14/08
CPC分类号： H04J14/08
摘要： A communication device includes: a communication unit that is connected to an optical ring network, conducts optical signal communication by time-division multiplexing, and receives a control signal for controlling an optical signal transmission timing from a master communication device; and a determination unit that determines the master communication device not to be operating properly and causes the subject communication device to operate as a new master communication device, in a case where the control signal is not received in a predetermined period. Thus, even in a case where the master device cannot operate properly, a slave device operates as the master device, so that the system operation can be continued.

2. 发明公开

US20230170990A1 OPTICAL COMMUNICATION SYSTEM, MASTER STATION, AND OPTICAL COMMUNICATION METHOD 审中-公开
公开(公告)号：US20230170990A1
公开(公告)日：2023-06-01
申请号：US17921569
申请日：2020-05-12
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Rintaro HARADA , Hirotaka UJIKAWA , Shin KANEKO , Jun TERADA
IPC分类号： H04B10/035 , H04B10/079
CPC分类号： H04B10/035 , H04B10/0795
摘要： 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.

3. 发明申请

US20230120832A1 MONITORING DEVICE, COMMUNICATION SYSTEM, COMMUNICATION CONTROL METHOD, AND MONITORING PROGRAM 有权
公开(公告)号：US20230120832A1
公开(公告)日：2023-04-20
申请号：US17907426
申请日：2020-03-30
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Naotaka SHIBATA , Hirotaka UJIKAWA
IPC分类号： H04W24/08 , H04W76/10 , H04W28/02
摘要： A monitoring device that monitors a network to which a plurality of terminal devices establishing a connection based on TCP are connected, includes: a request detection unit that detects a connection establishment request that a terminal device becoming a client sends to another terminal device becoming a server; an available bandwidth calculation unit that calculates an available bandwidth by subtracting a current amount of traffic from an allowable communication capacity, for each communication path identified by the connection establishment request detected by the request detection unit; and a setting command unit that, when the available bandwidth calculated by the available bandwidth calculation unit is larger than a preset value, transmits a command that sets the client to enlarge a congestion window to a predetermined value, regardless of presence or absence of an acknowledgement sent by the server.

4. 发明申请

US20220417914A1 BANDWIDTH ALLOCATION APPARATUS, BANDWIDTH ALLOCATION METHOD, AND BANDWIDTH ALLOCATION PROGRAM 有权
公开(公告)号：US20220417914A1
公开(公告)日：2022-12-29
申请号：US17269211
申请日：2019-08-16
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Hiroyuki UZAWA , Hirotaka UJIKAWA , Hirotaka NAKAMURA
IPC分类号： H04W72/04 , H04W28/20 , H04W72/12
摘要： A bandwidth allocation apparatus includes an acquisition unit acquiring scheduling information related to transmission of uplink data from a first subscriber line termination apparatus corresponding to a subscriber line termination apparatus needing to transfer uplink data with low latency, a requested amount reception unit receiving, from second subscriber line termination apparatus corresponding to a subscriber line termination apparatus not needing to transfer uplink data with low latency, information representing a requested amount related to transmission of uplink data from the second subscriber line termination apparatus, in a requested amount reception cycle corresponding to a cycle equal to or longer than a predetermined maximum round-trip time, and an allocation unit allocating, in an allocation amount determination cycle shorter than the requested amount reception cycle, a bandwidth to the uplink data from the first subscriber line termination apparatus on a basis of the scheduling information, and allocating, in the allocation amount determination cycle, a bandwidth to the uplink data from the second subscriber line termination apparatus on a basis of the information representing the requested amount.

5. 发明申请

US20210112016A1 TRANSFER APPARATUS, TRANSFER METHOD, AND TRANSFER PROGRAM 有权
公开(公告)号：US20210112016A1
公开(公告)日：2021-04-15
申请号：US17057034
申请日：2019-05-08
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Rintaro HARADA , Hiroyuki UZAWA , Hirotaka NAKAMURA , Daisuke HISANO , Hirotaka UJIKAWA , Jun TERADA
IPC分类号： H04L12/865
摘要： 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.

6. 发明公开

US20230421934A1 COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL SYSTEM, COMMUNICATION CONTROL METHOD AND COMMUNICATION CONTROL PROGRAM 审中-公开
公开(公告)号：US20230421934A1
公开(公告)日：2023-12-28
申请号：US18037072
申请日：2020-11-25
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Takamitsu TOCHINO , Hirotaka UJIKAWA , Yoshihito SAKAI
IPC分类号： H04Q11/00 , H04B10/032
CPC分类号： H04Q11/0067 , H04B10/032 , H04Q2011/0081
摘要： Provided are a communication control device, a communication control system, a communication control method, and a communication control program that make it difficult to reduce band utilization efficiency. In an OLT server 9b that is a communication control device, a transmission time storage unit 12 stores a transmission time of an optical signal between each ONU 3 and OLT 4. An optical transmission control unit 13 generates control information for controlling transmission start and transmission end of optical signals in each ONU 3. A failure detection suppression unit 15 calculates a first time at which the reception of the optical signal from an ONU 3p ends using control information and a transmission time. The failure detection suppression unit 15 calculates a second time at which synchronization processing ends after the reception of the optical signal from an ONU 3q that transmits the optical signal next after the ONU 3p is started using the synchronization time until the synchronization processing acquired by a synchronization time acquisition unit 14 ends. The failure detection suppression unit 15 causes the failure detection unit 11 that detects a link failure in an OLT 4 to suppress detection of a link failure from the first time to the second time.

7. 发明公开

US20230327756A1 COMMUNICATION MONITORING APPARATUS AND COMMUNICATION MONITORING SYSTEM 审中-公开
公开(公告)号：US20230327756A1
公开(公告)日：2023-10-12
申请号：US18024926
申请日：2020-09-11
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Tomoya HATANO , Hirotaka UJIKAWA , Sei KOU , Yuka OKAMOTO
IPC分类号： H04B10/079
CPC分类号： H04B10/079
摘要： Provided is a communication monitoring device and a communication monitoring system capable of monitoring a state of a connection device that forms an optical path by using an optical passive component. A communication management device (8) of a communication monitoring system (1) includes a plurality of photodetectors (11), a plurality of recognition units (14), a processing unit (15), and a transmission unit (16). The photodetectors (11) are provided in a connection device (6). The connection device (6) connects a plurality of optical communication lines (3) by using an optical passive component to form a plurality of optical paths through which optical signals pass. Each photodetector (11) detects an optical signal passing through the corresponding optical path. Each recognition unit (14) recognizes a state of detection of the optical signal by the corresponding photodetector (11). The processing unit (15) generates information regarding a communication state of the connection device (6) on the basis of information regarding the state of detection recognized by each recognition unit (14). The transmission unit (16) transmits the information regarding the communication state of the connection device (6) generated by the processing unit (15) to a receiving unit (9) outside a communication monitoring device (7).

8. 发明公开

US20230327755A1 COMMUNICATION MONITORING SYSTEM 审中-公开
公开(公告)号：US20230327755A1
公开(公告)日：2023-10-12
申请号：US18024939
申请日：2020-09-11
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Yuka OKAMOTO , Tomoya HATANO , Hirotaka UJIKAWA , Sei KOU
IPC分类号： H04B10/07
CPC分类号： H04B10/07
摘要： Provided is a communication monitoring system capable of monitoring a state of a connection device that forms an optical path by using an optical passive component. A communication monitoring system (1) includes a plurality of photodetectors (9) provided in a connection device (6), a plurality of recognition units (13), a processing unit (14), a light emitting unit (15), a mixing unit (12), a separation unit (16), a collection unit (17), and a management unit (18). The photodetector (9) detects an optical signal passing through a corresponding optical path. The recognition unit (13) recognizes a state of detection by the corresponding photodetector (9). The processing unit (14) generates information regarding a communication state of the connection device (6) on the basis of the recognition by each recognition unit (13). The light emitting unit (15) converts the generated information into a monitoring signal that is an optical signal and transmits the monitoring signal. The monitoring signal is passed through an optical communication line (3) as a mixed signal by the mixing unit (12) and is separated from the mixed signal by the separation unit (16). The collection unit (18) outputs the separated monitoring signal to the management unit (18) that manages a state of a PON (2).

9. 发明公开

US20230198613A1 OPTICAL COMMUNICATION SYSTEM AND MASTER STATION 审中-公开
公开(公告)号：US20230198613A1
公开(公告)日：2023-06-22
申请号：US17916789
申请日：2020-04-09
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Rintaro HARADA , Hirotaka UJIKAWA , Shin KANEKO , Jun TERADA
IPC分类号： H04B10/032
CPC分类号： H04B10/032
摘要： The present invention enables shortening the time required for resuming communication in a protection method that uses a backup path in an optical communication system that includes a master station device and multiple slave station devices. The slave station devices are connected to a loop path in parallel. The communication paths between the master station device and the slave station devices include a normal path and a backup path. The master station device executes communication control processing with respect to the slave station devices based on the RTTs. A first slave station device is a slave station device that cannot perform communication via the normal path. If the first slave station device is detected, the master station device calculates a first backup path for the first slave station device based on a first RTT between the master station device and the loop path, a loop RTT required for one full lap on the loop path, and the first normal path RTT for the first slave station device. The master station device then resumes communication control processing for the first slave station device based on the calculated first backup path RTT.

10. 发明公开

US20230145000A1 MONITORING DEVICE, COMMUNICATION SYSTEM, COMMUNICATION CONTROL METHOD, AND MONITORING PROGRAM 审中-公开
公开(公告)号：US20230145000A1
公开(公告)日：2023-05-11
申请号：US17914849
申请日：2020-03-30
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION
发明人： Naotaka SHIBATA , Hirotaka UJIKAWA
IPC分类号： H04W24/08 , H04W76/10 , H04W40/12
CPC分类号： H04W24/08 , H04W76/10 , H04W40/12 , H04W80/06
摘要： A monitoring device that monitors a network to which a plurality of terminal devices establishing a connection based on TCP are connected, includes: a request detection unit that detects a connection establishment request that a terminal device becoming a client sends to another terminal device becoming a server; an available bandwidth calculation unit that calculates an available bandwidth by subtracting a current amount of traffic from an allowable communication capacity, for each communication path identified by the connection establishment request detected by the request detection unit; and a setting command unit that, when the available bandwidth calculated by the available bandwidth calculation unit is smaller than a congestion window, transmits a command that sets the client to lower a slow start threshold to a predetermined value, or a command that sets the server to lower a window size to a predetermined value, regardless of whether or not a timeout occurs.

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