Kabushiki Kaisha Toshiba

Seijiro Yoneyama

Mitsuru Kanda

Yasuyuki Tanaka

Kiyoshi Toshimitsu

Kotaro Ise

Wakana Tsuchino

Masahiro Ishiyama

Yoshihiro Oba

Yasuyuki Kozakai

Tomoki Watanabe

Tomoya Horiguchi

Tatsuo Kozakaya

Ryuzo Okada

Yoshiki Terashima

Takahiro Kobayashi

Takaomi Murakami

Akira Ichie

The first wireless communication unit configured to wirelessly communicate with a first wireless apparatus on a first wireless network. The beacon transmitting unit cyclically transmits a beacon signal to the first wireless apparatus via the first wireless communication unit. The period determiner determines a transmission permission period during which data transmission by the first wireless apparatus is permitted. The notification unit notifies a control signal specifying the transmission permission period to the first wireless apparatus via the beacon signal. The power managing unit performs control so that power supply to the first wireless communication unit is suspended during a suspension period, the suspend period being a period except both the transmission permission period and a transmission timing period of the beacon signal within a whole period.

Communication apparatus

According to an embodiment, a wireless communication device includes a detector to detect a mobile object by referring to sensing information; a first communicating unit to communicate mobile object information, which is related to a detection result of the mobile object, with another wireless communication device; a first calculator to calculate a moving path of the mobile object between wireless communication devices by referring to the detection result of the mobile object and mobile object information received from the other wireless communication device; a second communicating unit to communicate movement information, which is related to the moving path of the mobile object, with the other wireless communication device; and a second calculator to calculate distances between wireless communication devices that are dependent on the number of times of movement in the moving path by referring to the calculated moving path and movement information received from the other wireless communication device.

Wireless communication device, wireless communication method, and computer program product

There is provided with a communication station including: a receiving unit, a determining unit, a transmitting unit and a reachability testing unit wherein the receiving unit receives a packet from a network in which a plurality of communication stations are interconnected, the determining unit determines whether the receiving unit receives a first packet in which a transmission source address is an address of a first communication station, the transmitting unit transmits a reply request packet to request a reply to the first communication station, and the reachability testing unit omits for the transmitting unit to transmit the reply request packet when the first packet is received before the transmitting unit transmits the reply request packet.

Communication station, communication control program, and communication network system

According to an embodiment, a communication apparatus includes a security control unit. The security control unit establishes first and second secure communication channels to a first server which manages communication security keys and second server which provides a service regarding a smart meter, respectively when operation to the smart meter is started, performs mutual authentication with the first server and acquire a first key from the first server via the first secure communication channel, and relays mutual authentication with the first server and acquisition of a second key from the first server via the first secure communication channel for the smart meter.

Communication apparatus and communication method

According to one embodiment, there is provided a communication device including a first communication layer receiving processor to perform a receiving process on a first communication layer on data received from a first communication device. The first communication layer receiving processor includes a first key identifying unit to identify, a key required to process the data; a first attribute identifying unit to identify, pursuant to key data, first attribute information that is attribute information associated with the key as identified; and a data processor to process the data using the key as identified. The data processed by the data processor and the first attribute information are passed to a second communication layer processor configured to perform a process on a second communication layer.

Communication device, communication method and computer program

A communication apparatus that identifies a fault of a radio link between a radio terminal and a radio base station includes according to an aspect of the present invention: a statistical information acquisition unit configured to acquire statistical information indicating a state of the radio link between the radio terminal and the radio base station from at least one of the radio terminal and the radio base station; and a fault identification unit configured to identify a fault of the radio link based on an acquired statistical information from among a plurality of faults associated with a plurality of statistical information beforehand.

Communication apparatus and program for identifying faults and computer program storage medium

A radio station connected to another radio station via a radio link and identifying a fault of the radio link, including: a radio link controlling unit, a statistical information acquiring unit and a fault identifying unit wherein the radio link controlling unit executes radio link control of the radio link in accordance with a radio link control scheme, the statistical information acquiring unit acquires statistical information indicating a state of the radio link during the execution of the radio link control, and the fault identifying unit identifies the fault of the radio link from among a plurality of faults associated with statistical information, on the basis of the statistical information acquired by the statistical information acquiring unit.

Radio station

According to an embodiment, a communication device connected to a host device includes a wireless communication unit and a communication control unit. The communication control unit controls the wireless communication unit to transmit a file which is stored in a storage unit of the communication device by the host device to a transmission destination corresponding to a type of the host device and a type of the communication device using wireless communication.

Communication device, host device, communication control method, and computer program product for transmitting file

According to an embodiment, a communication apparatus establishes communication with an external apparatus through a higher-level device. The communication apparatus includes a main processor and a key generator. The main processor receives a data authentication request including data to be authenticated, a first key specification, and a message authentication algorithm identifier from the higher-level device. The key generator retains a key hierarchy used by an authentication protocol that is used between the higher-level device and the external apparatus, and to generate a first key by use of the key hierarchy and the first key specification. The main processor generates a message authentication code for the data to be authenticated by use of the message authentication algorithm, which is identified by the message authentication algorithm identifier, and the first key, and transmits a data authentication response including the message authentication code to the higher-level device.

Communication apparatus and computer program product

When handover is performed from a first network to a second network, a home agent transmits a reply request message to a terminal through the first network after new configuration of a tunnel for transmitting and receiving a packet through the second network. If the home agent receives a reply message corresponding to the reply request message through the first network, the home agent detects that the configuration of the tunnel for transmitting and receiving the packet through the first network can be deleted, and deletes the configuration of the tunnel.

Home agent

When handover is performed from a first network to a second network, a terminal transmits a reply request message to a home agent through the first network after new configuration of a tunnel for transmitting and receiving a packet through the second network. If the terminal receives a reply message corresponding to the reply request message through the first network, the terminal detects that the configuration of the tunnel for transmitting and receiving the packet through the first network can be deleted, and deletes the configuration of the tunnel.

Mobile terminal

A bridging device, and a method and computer readable medium for controlling the bridging device, wherein the bridging device stores router identifying information and network prefix information contained in a router advertisement (RA) that is regularly sent from a router. When the stored router identifying information and network prefix information become invalid, the bridging device generates an RA packet containing new valid router identifying information and network prefix information, whose lifetime is set infinite, and sends the RA packet to a communication terminal. This arrangement can reduce the frequency of the transmission of the RA packet from the router to the communication terminal, thereby decreasing the RA-packet processing load of the communication terminal.

Growing community of inventors

Yokohama, Japan

Seijiro Yoneyama