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公开(公告)号：US20230247517A1
公开(公告)日：2023-08-03
申请号：US17768120
申请日：2019-10-16
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka SHIBATA , Keita TAKAHASHI , Jun TERADA
IPC: H04W40/12
CPC classification number: H04W40/12
Abstract: A signal transfer control apparatus that performs a control operation to switch a plurality of communication paths constituted by a plurality of signal transfer apparatuses transferring a signal includes: a fixed delay information acquisition unit that acquires fixed delay information for each of the plurality of communication paths; a traffic information acquisition unit that acquires traffic information indicating a traffic volume or each of the plurality of communication paths; a probability density function estimation unit that estimates a probability density function of a traffic volume of each of the plurality of communication paths based on the traffic information; an occurrence probability estimation unit that estimates an occurrence probability of variable delay in each of the plurality of communication paths based on the probability density function of each of the plurality of communication paths; a communication path calculation unit that performs a calculation for specifying a communication path which is highly likely to satisfy a predetermined delay condition based on the occurrence probability of the variable delay in each of the plurality of communication paths and the fixed delay information for each of the plurality of communication paths; and a setting instruction unit that outputs a setting instruction for switching a transfer destination of a signal to at least any one of the signal transfer apparatuses so that the signal is transferred via the communication path specified by the calculation performed by the communication path calculation unit.
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公开(公告)号：US20230146851A1
公开(公告)日：2023-05-11
申请号：US17907948
申请日：2020-03-06
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Tomoya HATANO , Keita TAKAHASHI , Naotaka SHIBATA , Hiroko NOMURA
IPC: H04B10/61 , H04B10/03 , H04B10/275
CPC classification number: H04B10/614 , H04B10/03 , H04B10/275
Abstract: A communication system of a passive optical communication network includes an optical line terminal (OLT) system including a first OLT, a second OLT, and an OLT control device that controls the first OLT and the second OLT, a plurality of splitters that connect the first OLT and the second OLT with an optical communication path, and an ONU that is connected to each of the splitters with an optical communication path. The splitter distributes and outputs an optical signal transmitted from the OLT system to the ONU connected to the splitter and a succeeding device that is another splitter or the OLT system, and the OLT control device determines a distribution ratio at the splitter, the distribution ratio indicating a ratio between the intensity of the optical signal distributed to the succeeding device and the intensity of the optical signal distributed to the ONU.
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公开(公告)号：US20230137775A1
公开(公告)日：2023-05-04
申请号：US17913197
申请日：2020-03-27
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka SHIBATA , Hirotaka UJIKAWA
Abstract: A base station which performs relaying between a wireless terminal and a server, the wireless terminal and the server establishing connection with each other, includes a request detection unit which detects a connection establishment request transmitted to the server by the wireless terminal, a response detection unit which detects an acknowledgment transmitted to the wireless terminal by the server on the basis of the connection establishment request detected by the request detection unit, and a band allocation unit which, if the response detection unit detects the acknowledgment, performs allocation so as to expand a band over which the wireless terminal is capable of transmission to the server, regardless of presence or absence of a buffer amount notification from the wireless terminal.
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公开(公告)号：US20230133100A1
公开(公告)日：2023-05-04
申请号：US17911736
申请日：2020-03-19
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Tomoya HATANO , Keita TAKAHASHI , Naotaka SHIBATA , Hiroko NOMURA
Abstract: One aspect of the present invention is a communication system for a passive optical network that includes: an OLT system including a first OLT (Optical Line Terminal), a second OLT, and an OLT control apparatus that controls the first OLT and the second OLT; a plurality of splitters that are connected between the first OLT and the second OLT using optical communication channels; and ONU systems that are connected to the respective splitters using optical communication channels, and each include a first session establishing unit that establishes a session with the first OLT, a second session establishing unit that establishes a session with the second OLT, and a signal processing unit that executes signal processing of an ONU (Optical Network Unit) based on an optical signal output from the first session establishing unit or the second session establishing unit.
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Patent Agency Ranking
45.发明申请公开(公告)号：US20230113911A1
公开(公告)日：2023-04-13
申请号：US17907958
申请日：2020-03-09
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Hiroko NOMURA , Naotaka SHIBATA , Keita TAKAHASHI , Tomoya HATANO
Abstract: In a signal transfer system including a signal transfer management apparatus and a plurality of signal transfer apparatuses connected in multiple stages that form a network between distribution station apparatuses and a central station apparatus, a first signal transfer apparatus directly connected to a distribution station apparatus among the plurality of signal transfer apparatuses acquires the amount of data of a high priority signal that will be output next from the distribution station apparatus, measures the amount of traffic of the high priority signal received from the distribution station apparatus, calculates opening and closing timings of a gate for transferring a low priority signal based on the amount of data and the amount of traffic, and opens and closes the gate for transferring the low priority signal. This enables efficient use of the network bandwidth.
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46.发明申请公开(公告)号：US20230075721A1
公开(公告)日：2023-03-09
申请号：US17800136
申请日：2020-02-18
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Keita TAKAHASHI , Naotaka SHIBATA , Jun TERADA
IPC: H04J3/06
Abstract: A signal transfer management apparatus manages operations of a plurality of signal transfer devices in a system in which the signal transfer devices forming a packet network transmit and receive time synchronization messages including time information between a master device having a reference time and a plurality of slave devices. The signal transfer management apparatus includes a gate calculation unit configured to calculate a gate start time of each of uplink time gates and a gate start time of each of downlink time gates of the plurality of signal transfer devices and open each of the time gates, a comparison unit configured to compare uplink time synchronization messages from the plurality of slave devices to the master device and detect a conflict between the uplink time synchronization messages, and an offset unit configured to, when the comparison unit detects the conflict between the uplink time synchronization messages of the signal transfer devices, adjust the a gate start time of each of the uplink time gates and the a gate start time of each of the downlink time gates of the signal transfer devices and set the adjusted gate start time in the signal transfer devices. Thus, it is possible to avoid conflict between time synchronization messages without decreasing the time synchronizing accuracy.
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47.发明申请公开(公告)号：US20220210718A1
公开(公告)日：2022-06-30
申请号：US17601849
申请日：2020-03-26
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka SHIBATA , Hiroyuki UZAWA , Hirotaka UJIKAWA , Yoichi FUKADA , Jun TERADA
Abstract: A signal forwarding system includes: a plurality of signal forwarding devices forming a plurality of communication routes between a slave station and a master station; and a route control device that determines a communication route, wherein the route control device includes at least: a communication route calculation unit that calculates a communication route in response to a route switching request; and a forward destination setting instruction unit that outputs forward destination setting information based on the communication route, the signal forwarding devices include at least: a forward destination setting instruction acquisition unit that acquires the forward destination setting information; a forward destination set unit that changes a forward destination based on the forward destination setting information; and a forward unit that outputs input traffic based on the forward destination, and any of the route control device and the signal forwarding devices includes: a traffic monitor unit; a non-signal period estimation unit that estimates a non-signal period in which the traffic does not flow; and a switching timing control unit that controls a switching timing to perform route switching in the non-signal period.
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公开(公告)号：US20220006509A1
公开(公告)日：2022-01-06
申请号：US17291254
申请日：2019-10-25
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka SHIBATA , Hirofumi YAMAMOTO , Keita TAKAHASHI , Noriyuki OTA , Jun TERADA
Abstract: A relay device that relays between a plurality of radio devices that perform radio communication with terminals, and at least one radio control device that controls the radio devices, the relay device including: a replication necessity determination unit that determines whether or not to replicate a downlink signal received from the radio control device; a signal replicating unit that makes the same number of copies of a downlink signal as the number of destination radio devices only when the replication necessity determination unit determines that the downlink signal is to be replicated; and a downlink signal assignment unit that transfers a downlink signal that has been determined by the replication necessity determination unit as a signal that is not to be replicated, and downlink signals replicated by the signal replicating unit, to the radio devices respectively corresponding thereto.
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公开(公告)号：US20180294881A1
公开(公告)日：2018-10-11
申请号：US15574319
申请日：2016-04-07
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka SHIBATA , Shigeru KUWANO , Yutaka KAMAMOTO , Takehiro MORIYA , Jun TERADA
IPC: H04B10/2575 , H04L29/06
Abstract: An optical communication system includes a signal processing apparatus and a wireless apparatus between which functions of a base station are divided, wherein a periodic symbol sequence including a cyclic prefix appended to a signal of a predetermined size to which an IFFT (Inverse Fast Fourier Transform) has been applied is transmitted between the signal processing apparatus and the wireless apparatus by means of digital RoF (Radio over Fiber) transmission, the signal processing apparatus and the wireless apparatus each include a transmission unit and a reception unit, the transmission unit includes: a compression size determination unit that acquires symbol information relating to a starting position of the symbol sequence and lengths of symbols constituting the symbol sequence, and that determines, based on the acquired symbol information, a compression size for each of symbols that are to be compressed; and a compression unit that compresses the symbol sequence in units of determined compression sizes, and the reception unit includes: an expansion size determination unit that determines an expansion size for each of symbols in the symbol sequence that are to be expanded; and an expansion unit that expands the symbol sequence in units of determined expansion sizes.
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