Patents by Inventor Tetsu Nakajima
Tetsu Nakajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20120200397Abstract: A communication device includes a first receiver, a second receiver, a communication module, and a controller. The first receiver receives an operation signal from a remote controller. The second receiver receives a radio signal with a specific frequency. A power consumption of the second receiver is less than that of the first receiver. The communication module is capable of transmitting the operation signal to a first communication device. The controller controls power supply to the first receiver and the communication module and starts power supply to the first receiver and the communication module if the second receiver receives the radio signal. The communication module turns to a standby state if the first receiver does not receive the operation signal after start of power supply to the first receiver.Type: ApplicationFiled: February 17, 2012Publication date: August 9, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tetsu NAKAJIMA, Tomoko Adachi, Kiyoshi Toshimitsu
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Patent number: 8228889Abstract: A communication apparatus which generates a single physical frame including a plurality of MAC frames, and which transmits the physical frame. The physical frame has variable-length bitmap information which includes bits corresponding to the plurality of MAC frames, respectively, and length information of the bitmap information. The communication apparatus can include a transmission scheme selecting device configured to select a transmission scheme of the physical frame to be transmitted as a response to the polling frame from a plurality of candidates in such a manner as to adapt to a channel estimate result estimated by the channel estimating device. The transmission scheme in this arrangement includes at least one of a modulation scheme and a coding ratio.Type: GrantFiled: September 25, 2006Date of Patent: July 24, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tetsu Nakajima, Yoriko Utsunomiya, Daisuke Takeda
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Patent number: 8165536Abstract: A wireless communication apparatus includes an M-number of (M is an integer of 2 or more) receiving portions connected to respective antennas, a frame analyzing section configured to analyze a reception signal received by the M-number of receiving portions, and a selecting section configured to select a receiving portion to be in service from the M-number of receiving portions. The selecting section selects a P-number of (P is an integer of from 0 to M) receiving portions from the M-number of receiving portions, based on an analysis result obtained by the frame analyzing section.Type: GrantFiled: October 14, 2005Date of Patent: April 24, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Sekiya, Kiyoshi Toshimitsu, Tetsu Nakajima, Katsuya Nounin, Tsuguhide Aoki, Tomoya Tandai, Tomoko Adachi, Daisuke Takeda
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Publication number: 20120088460Abstract: According to one embodiment, a communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.Type: ApplicationFiled: December 15, 2011Publication date: April 12, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tetsu NAKAJIMA, Tomoko Adachi, Kiyoshi Toshimitsu, Tatsuma Hirano, Yoriko Utsunomiya
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Patent number: 8107404Abstract: By using multiple channels at the same time to realize broadbanding of the frequency channels and suppressing increase in the waiting time before starting transmission of wireless signals, improvement of the practical throughput can be realized.Type: GrantFiled: December 18, 2008Date of Patent: January 31, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Yoriko Utsunomiya, Tetsu Nakajima, Tomoya Tandai, Masahiro Takagi
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Publication number: 20120014335Abstract: There is provided a wireless terminal including: a frame allocating unit performing an allocation process on a frame to be transmitted to another wireless terminal; a first communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a first channel or a first mode; a second communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a second channel or a second mode, wherein the allocating unit allocates the frame to one of the first and second communication units; when changing the transmission source of the frame from the one to the other communication unit, a change notification frame including a transmission starting sequence number is transmitted to the another wireless terminal; and the frame allocating unit switches the allocation destination of the frame from the one to the other.Type: ApplicationFiled: July 15, 2011Publication date: January 19, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoko Adachi, Tetsu Nakajima
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Patent number: 7990995Abstract: A wireless communication apparatus includes a main queue to store MAC frames, a plurality of subqueues related to the main queue and used to control retransmission of the MAC frame, each of the subqueues having different priority for transmission of the MAC frame, respectively, an extracting device configured to extract the MAC frame from the main queue on the basis of a destination and the priority, and distribute the extracted MAC frame to one of the plurality of subqueues for each priority, and an aggregating device configured to extract MAC frames from the plurality of subqueues to form a MAC super frame.Type: GrantFiled: May 26, 2005Date of Patent: August 2, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
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Publication number: 20110178959Abstract: A charge and discharge control device for controlling a battery in an electric vehicle to be charged and discharged with electricity, the electricity being transmitted and received through a power line, and being bought and sold, includes a switching unit, a communication unit, a determination unit and a controller. The switching unit switches charge and discharge. The communication unit receives current electricity price. The determination unit determines first and second electricity price thresholds. The first electricity price threshold is determined using difference between current and start times, and difference between current and target amounts of charge. The second electricity price threshold is equal to or larger than the first electricity price threshold.Type: ApplicationFiled: September 2, 2010Publication date: July 21, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tetsu Nakajima, Noritaka Deguchi
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Patent number: 7924805Abstract: A communication apparatus having a generating which generates a single physical frame for transmission and reception. The physical frame includes a first Quality of Service (QoS) data frame, a second Quality of Service (QoS) data frame, and a transmission request for requesting transmission of first acknowledgement information corresponding to the first QoS data frame and second acknowledgement information corresponding to the second QoS data frame. The communication apparatus includes a transmitting unit configured to transmit the physical frame and a receiving unit configured to receive acknowledgment information including a reception of the physical frame transmitted.Type: GrantFiled: April 21, 2005Date of Patent: April 12, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tetsu Nakajima, Yoriko Utsunomiya, Daisuke Takeda
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Publication number: 20110064065Abstract: A wireless communication apparatus performs bi-directional communication with an initiator. The apparatus is allocated an allocation period for data transmission from the initiator. The apparatus includes means for generating a first physical frame including an acknowledgement frame with respect to data received from the initiator, and generating a second physical frame in which a plurality of transmission data frames addressed to the initiator are aggregated. The apparatus also includes means for transmitting the first physical frame at a first transmission rate and the second physical frame at a second transmission rate, during the allocation period.Type: ApplicationFiled: November 19, 2010Publication date: March 17, 2011Inventors: Tetsu NAKAJIMA, Tomoko ADACHI, Masahiro TAKAGI, Tomoya TANDAI, Yoriko UTSUNOMIYA, Toshihisa NABETANI
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Patent number: 7903632Abstract: A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU.Type: GrantFiled: October 27, 2009Date of Patent: March 8, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
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Publication number: 20110044257Abstract: By using multiple channels at the same time to realize broadbanding of the frequency channels and suppressing increase in the waiting time before starting transmission of wireless signals, improvement of the practical throughput can be realized.Type: ApplicationFiled: December 18, 2008Publication date: February 24, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yoriko Utsunomiya, Tetsu Nakajima, Tomoya Tandai, Masahiro Takagi
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Patent number: 7869418Abstract: A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU.Type: GrantFiled: October 27, 2009Date of Patent: January 11, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
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Patent number: 7852791Abstract: A wireless communication apparatus performs bi-directional communication with an initiator. The apparatus is allocated an allocation period for data transmission from the initiator. The apparatus includes means for generating a first physical frame including an acknowledgement frame with respect to data received from the initiator, and generating a second physical frame in which a plurality of transmission data frames addressed to the initiator are aggregated. The apparatus also includes means for transmitting the first physical frame at a first transmission rate and the second physical frame at a second transmission rate, during the allocation period.Type: GrantFiled: August 30, 2007Date of Patent: December 14, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Tetsu Nakajima, Tomoko Adachi, Masahiro Takagi, Tomoya Tandai, Yoriko Utsunomiya, Toshihisa Nabetani
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Patent number: 7848330Abstract: A communication apparatus includes a receiving device configured to receive a physical frame in which a plurality of MAC frames, each having a sequence number, are aggregated. A reception buffer which stores MAC frames of the physical frame received by the receiving device. A determination device determines whether or not the first MAC frame in the physical frame received by the receiving device has been successfully received. A reception buffer management device determines, when the first MAC frame has been successfully received, a MAC frame to be forwarded to an upper layer, on the basis of the sequence number of the first MAC frame, and extracts the MAC frame from the reception buffer.Type: GrantFiled: September 11, 2009Date of Patent: December 7, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
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Patent number: 7773601Abstract: A wireless communication apparatus is disclosed. A transmitting device transmits a first aggregation frame in which first transmission data frames are aggregated. A measuring device measures a number value of retransmission of each of the first transmission data frames. A storage stores a limiting value of the number value of retransmission. A determination device determines whether the number value of retransmission of each of the first transmission data frames exceeds the limiting value. A transmission buffer buffers the first transmission data frames for which it is determined that the number value of retransmission does not exceed the limiting value, and discards the first transmission data frames for which it is determined that the number value of retransmission exceeds the limiting value, of the first transmission data frames. A retransmitting device retransmits the first aggregation frame in which the first transmission data frames buffered in the transmission buffer are aggregated.Type: GrantFiled: May 4, 2007Date of Patent: August 10, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Tetsu Nakajima, Tomoko Adachi, Masahiro Takagi, Tomoya Tandai, Yoriko Utsunomiya, Yasuyuki Nishibayashi
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Publication number: 20100189056Abstract: A physical frame is generated and transmitted to a destination terminal. In this physical frame, one of a data frame, an acknowledgement frame, and an acknowledgement request frame, and a transmission permission frame which is used in place of a normal Ack frame associated with a delayed Block Ack, and permits the destination terminal to perform piggyback transmission, are aggregated.Type: ApplicationFiled: December 23, 2009Publication date: July 29, 2010Inventors: Yasuyuki NISHIBAYASHI, Masahiro Takagi, Tomoko Adachi, Tetsu Nakajima, Tomoya Tandai, Yoriko Utsunomiya
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Patent number: 7746861Abstract: A communication apparatus includes a receiving device configured to receive a physical frame in which a plurality of MAC frames, each having a sequence number, are aggregated. A reception buffer which stores MAC frames of the physical frame received by the receiving device. A determination device determines whether or not the first MAC frame in the physical frame received by the receiving device has been successfully received. A reception buffer management device determines, when the first MAC frame has been successfully received, a MAC frame to be forwarded to an upper layer, on the basis of the sequence number of the first MAC frame, and extracts the MAC frame from the reception buffer.Type: GrantFiled: August 11, 2005Date of Patent: June 29, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
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Patent number: 7743310Abstract: A generation device generates a frame to be transmitted to a destination communication apparatus. The frame includes a first separation field, a first MAC protocol data unit (MPDU) following the first separation field, a second separation field following the first MPDU, a third separation field following the second separation field, and a third MPDU following the third separation field. The second separation field includes length information set to a value of zero to indicate no second MPDU directly follows the second separation field. The first MPDU includes a first MAC header, a first data field, and a first frame check sequence (FCS). The first FCS is for detecting an error occurred in at least the first data field. The third MPDU includes a third MAC header, a third data field, and a third FCS. The third FCS is for detecting an error occurred in at least the third data field.Type: GrantFiled: November 27, 2009Date of Patent: June 22, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tetsu Nakajima, Yoriko Utsunomiya, Tomoya Tandai
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Patent number: 7738441Abstract: A communication apparatus includes a receiving device configured to receive one physical frame in which a plurality of MAC frames are aggregated. This physical frame includes one acknowledgement request frame for the plurality of MAC frames. The apparatus includes an acknowledgement frame forming device configured to form an acknowledgement frame representing reception statuses of the plurality of MAC frames in response to the acknowledgement request frame. The apparatus also includes a transmitting device configured to transmit the acknowledgement frame. This acknowledgement frame includes a compressed acknowledgement frame representing an acknowledgement bitmap having a size equal to a maximum number of MSDUs (MAC Service Data Units) when one MPDU (MAC Protocol Data Unit) corresponds to one MSDU.Type: GrantFiled: August 10, 2005Date of Patent: June 15, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya