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公开(公告)号：US10045375B2
公开(公告)日：2018-08-07
申请号：US15111917
申请日：2014-02-05
Applicant: Hitachi, Ltd.
Inventor： Yasutaka Serizawa , Masayuki Miyazaki , Kenichiro Yamane , Tatsuki Inuduka , Ryo Nakano , Satoru Harada
Abstract: In a multi-hop radio communication network including a base station (a radio station connected to a management server), each radio station in the network is given a data transmission opportunity in turn according to a predetermined transmission order, and transmits data via broadcast or multicast upon occurrence of transmission timing. The radio station having received the data adds data of the radio station to the received data and then forwards the packet via broadcast or multicast when it is the radio station's turn for transmission.
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Patent Agency Ranking
公开(公告)号：US11238673B2
公开(公告)日：2022-02-01
申请号：US16617663
申请日：2018-04-17
Applicant: Hitachi, Ltd.
Inventor： Jumpei Honda , Takuma Nishimura , Hiroshige Kashiwabara , Hidemasa Nakai , Yuichi Igarashi , Ryo Nakano
Abstract: An inspection target reading device includes a wireless slave station that performs communication via a wireless network, a measurement unit that measures a state of an inspection target, and an analysis unit that generates measurement data, and transmits the measurement data from the wireless slave station via the wireless network. An automatic inspection system includes a wireless master station that communicates with each inspection target reading device via the wireless network, a data acquisition unit that acquires the measurement data from each inspection target reading device through a wireless master station, a data storage unit that stores the measurement data, a determination condition storage unit that stores determination conditions related to the measurement data, and an inspection unit that outputs predetermined measurement data selected from the stored measurement data and a predetermined determination condition corresponding to the predetermined measurement data among the stored determination conditions in association with each other.
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公开(公告)号：US10433182B2
公开(公告)日：2019-10-01
申请号：US16309023
申请日：2017-03-21
Applicant: HITACHI, LTD.
Inventor： Ryo Nakano , Takuma Nishimura , Hirotaka Moribe , Shinichi Tsunoo
Abstract: A network management device manages a wireless multi-hop network; a network configuration management unit that manages communication quality information between wireless devices and between the wireless devices and the gateway; a repeater necessity determination unit that determines whether to add a repeater for each of the wireless devices based on the communication quality information and selects the wireless device that is required to add the repeater based on a determination result; an access point determination unit determines access points for securing a predetermined communication quality for the wireless device selected; and a repeater placement determination unit that determines whether there is a repeater installation location indicating an installation range of the repeater for relaying the wireless device selected and the access point selected by the access point determination unit based on a communication range of the wireless device selected and a communication range of the access point selected.
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公开(公告)号：US11190950B2
公开(公告)日：2021-11-30
申请号：US16468474
申请日：2017-12-22
Applicant: HITACHI, LTD.
Inventor： Ryo Nakano , Yuichi Igarashi , Takuma Nishimura
IPC: H04W16/18 , H04B17/309 , H04B17/40 , H04B7/26
Abstract: A communication system includes: storage to store location information of each of a plurality of devices capable of wireless multi-hop communication, site configuration information including location and size information of an obstacle present at a site of the plurality of devices, and communication quality information between devices; a determination unit determines whether a repeater needs to be added for each of the plurality of devices, based on communication quality information; and a decision unit calculates an expected value related to attenuation of received power between the first and second devices caused by the obstacle, and decides a location for the determination unit to add the repeater based on location information of the first device determined, location information of the second device different from the first device and communicated with the first device through the repeater, the communication quality information between the first and second device, and the site configuration information.
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公开(公告)号：US10819600B2
公开(公告)日：2020-10-27
申请号：US16164962
申请日：2018-10-19
Applicant: HITACHI, LTD.
Inventor： Yuichi Igarashi , Ryo Nakano , Jumpei Honda , Hiroshige Kashiwabara , Takuma Nishimura
IPC: H04L12/26 , H04L29/08 , G05B19/418 , H04W84/18
Abstract: A data collection apparatus collecting data from a terminal device connected through a communication path, comprising a schedule managing unit determining a schedule transmitting a data acquisition request to the terminal device according to managed timing data, a transmission amount adjusting unit adjusting a transmission amount of the data acquisition request, and a collected data managing unit managing the data collected from the terminal device, in which the schedule managing unit manages a start point time that is a time at which a data collection from each terminal device starts, a collection period that is an interval of the data collection from each terminal device, a retransmission interval that is a time until the data acquisition request is retransmitted when the data collection from the terminal device fails, and a retransmission number that is the number of times to retransmit the data acquisition request as the timing data.
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公开(公告)号：US20190123986A1
公开(公告)日：2019-04-25
申请号：US16164962
申请日：2018-10-19
Applicant: HITACHI, LTD.
Inventor： Yuichi Igarashi , Ryo Nakano , Jumpei Honda , Hiroshige Kashiwabara , Takuma Nishimura
CPC classification number: H04L43/08 , H04L43/024 , H04L67/125 , H04L67/325 , H04W84/18
Abstract: A data collection apparatus collecting data from a terminal device connected through a communication path, comprising a schedule managing unit determining a schedule transmitting a data acquisition request to the terminal device according to managed timing data, a transmission amount adjusting unit adjusting a transmission amount of the data acquisition request, and a collected data managing unit managing the data collected from the terminal device, in which the schedule managing unit manages a start point time that is a time at which a data collection from each terminal device starts, a collection period that is an interval of the data collection from each terminal device, a retransmission interval that is a time until the data acquisition request is retransmitted when the data collection from the terminal device fails, and a retransmission number that is the number of times to retransmit the data acquisition request as the timing data.
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