Patents by Inventor Eiji Kamagata
Eiji Kamagata 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: 20060056341Abstract: An information communication scheme for enabling the radio base station to carry out both point-to-point user information communications and point-to-multipoint user information communications with respect to radio terminals is disclosed. A first media access control identifier is allocated to a radio terminal which made a connection request, a correspondence between the first media access identifier and the radio terminal is broadcast, and a user information destined to the radio terminal is transmitted using a time-slot corresponding to the first media access control identifier. On the other hand, a second media access control identifier is allocated to a multicast information identifier, a correspondence between the second media access control identifier and the multicast information identifier is transmitted, and the multicast information is transmitted using a time-slot corresonding to the second media access control identifier.Type: ApplicationFiled: September 12, 2005Publication date: March 16, 2006Inventors: Masahiro Takagi, Keiji Tsunoda, Takafumi Sakamoto, Eiji Kamagata
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Patent number: 6999438Abstract: In a radio communication system having narrow-band up- and down-link radio channels and a wide-band down-link radio channel, when a radio terminal is to receive data through the wide-band down-link radio channel, the narrow-band up- and down-link radio channels are assigned to the radio terminal in advance. With this operation, communication an be performed by using the wide-band down-link radio channel. In addition, the narrow-band up- and down-link radio channels can be used as radio channels for performing control to efficiently transmit data by using the wide-band down-link radio channel.Type: GrantFiled: May 17, 2004Date of Patent: February 14, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Katsuya Nounin, Kiyoshi Toshimitsu, Takafumi Sakamoto, Nobuyasu Nakajima, Eiji Kamagata, Mutsumu Serizawa
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Patent number: 6965580Abstract: An information communication scheme for enabling the radio base station to carry out both point-to-point user information communications and point-to-multipoint user information communications with respect to radio terminals is disclosed. A first media access control identifier is allocated to a radio terminal which made a connection request, a correspondence between the first media access identifier and the radio terminal is broadcast, and a user information destined to the radio terminal is transmitted using a time-slot corresponding to the first media access control identifier. On the other hand, a second media access control identifier is allocated to a multicast information identifier, a correspondence between the second media access control identifier and the multicast information identifier is transmitted, and the multicast information is transmitted using a time-slot corresonding to the second media access control identifier.Type: GrantFiled: August 16, 2000Date of Patent: November 15, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Takagi, Keiji Tsunoda, Takafumi Sakamoto, Eiji Kamagata
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Publication number: 20050147053Abstract: A communication node which can reliably transfer a packet with a payload including data having error resistance in radio environments is disclosed. A packet to be transmitted is divided into segments to form a plurality of packet segments. From among a plurality of error correction schemes that have been prepared in advance, the scheme to be employed is selected for each of the packet segments in accordance with predetermined criteria, and the selected error correction scheme is applied to each packet segment. Subsequently, the processed packet segment is transmitted to the network. Packet segments are received from the network. From among a plurality of error correction schemes prepared in advance, the scheme to be employed is selected for each of the received packet segments based on predetermined information contained in each received packet segment, and the selected error correction scheme is applied to the received packet segment.Type: ApplicationFiled: December 30, 2004Publication date: July 7, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Takeshi Saito, Keiji Tsunoda, Eiji Kamagata, Noriyasu Kato, Ichiro Tomoda, Hirokazu Tanaka
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Publication number: 20050132049Abstract: In the disclosed information delivery scheme for delivering WWW information provided by information servers on the Internet to mobile computers connected to the Internet through a wireless network, a plurality of cache servers capable of caching WWW information provided by the information servers are provided in association with the wireless network. The cache servers can be managed by receiving a message indicating at least a connected location of a mobile computer in the wireless network from the mobile computer, selecting one or more cache servers located nearby the mobile computer according to the message, and controlling these one or more cache servers to cache selected WWW information selected for the mobile computer, so as to enable faster accesses to the selected WWW information by the mobile computer.Type: ApplicationFiled: January 21, 2005Publication date: June 16, 2005Inventors: Atsushi Inoue, Eiji Kamagata, Noriyasu Kato, Naohisa Shibuya, Yoshinari Kumaki, Yasuro Shobatake
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Publication number: 20050119011Abstract: A radio terminal capable of effectively utilizing push type distribution information is disclosed. The radio terminal is formed by a reception unit configured to receive push type distribution information from a radio base station, a location recognition unit configured to carry out a recognition related to an area in which the radio terminal is located, and a reception control unit configured to determine whether or not to receive the push type distribution information according to a recongition result of the location recognition unit, and control the reception unit according to a determination result.Type: ApplicationFiled: October 12, 2004Publication date: June 2, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Takafumi Sakamoto, Eiji Kamagata, Keiji Tsunoda, Kiyoshi Toshimitsu
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Patent number: 6874017Abstract: In the disclosed information delivery scheme for delivering WWW information provided by information servers on the Internet to mobile computers connected to the Internet through a wireless network, a plurality of cache servers capable of caching WWW information provided by the information servers are provided in association with the wireless network. The cache servers can be managed by receiving a message indicating at least a connected location of a mobile computer in the wireless network from the mobile computer, selecting one or more cache servers located nearby the mobile computer according to the message, and controlling these one or more cache servers to cache selected WWW information selected for the mobile computer, so as to enable faster accesses to the selected WWW information by the mobile computer.Type: GrantFiled: March 23, 2000Date of Patent: March 29, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Atsushi Inoue, Eiji Kamagata, Noriyasu Kato, Naohisa Shibuya, Yoshinari Kumaki, Yasuro Shobatake
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Patent number: 6850519Abstract: A communication node which can reliably transfer a packet with a payload including data having error resistance in radio environments is disclosed. A packet to be transmitted is divided into segments to form a plurality of packet segments. From among a plurality of error correction schemes that have been prepared in advance, the scheme to be employed is selected for each of the packet segments in accordance with predetermined criteria, and the selected error correction scheme is applied to each packet segment. Subsequently, the processed packet segment is transmitted to the network. Packet segments are received from the network. From among a plurality of error correction schemes prepared in advance, the scheme to be employed is selected for each of the received packet segments based on predetermined information contained in each received packet segment, and the selected error correction scheme is applied to the received packet segment.Type: GrantFiled: September 3, 1999Date of Patent: February 1, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Saito, Keiji Tsunoda, Eiji Kamagata, Noriyasu Kato, Ichiro Tomoda, Hirokazu Tanaka
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Publication number: 20040224719Abstract: In a radio communication system having narrow-band up- and down-link radio channels and a wide-band down-link radio channel, when a radio terminal is to receive data through the wide-band down-link radio channel, the narrow-band up- and down-link radio channels are assigned to the radio terminal in advance. With this operation, communication an be performed by using the wide-band down-link radio channel. In addition, the narrow-band up- and down-link radio channels can be used as radio channels for performing control to efficiently transmit data by using the wide-band down-link radio channel.Type: ApplicationFiled: May 17, 2004Publication date: November 11, 2004Inventors: Katsuya Nounin, Kiyoshi Toshimitsu, Takafumi Sakamoto, Nobuyasu Nakajima, Eiji Kamagata, Mutsumu Serizawa
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Patent number: 6807427Abstract: A radio terminal capable of effectively utilizing push type distribution information is disclosed. The radio terminal is formed by a reception unit configured to receive push type distribution information from a radio base station, a location recognition unit configured to carry out a recognition related to an area in which the radio terminal is located, and a reception control unit configured to determine whether or not to receive the push type distribution information according to a recognition result of the location recognition unit, and control the reception unit according to a determination result.Type: GrantFiled: November 28, 2000Date of Patent: October 19, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Takafumi Sakamoto, Eiji Kamagata, Keiji Tsunoda, Kiyoshi Toshimitsu
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Publication number: 20020186680Abstract: A communication scheme for improving the performance of communications utilizing the transport layer connection provided via a radio network, by enabling a control of the transport layer connection according to the radio communication state and property of the radio terminal, without changing implementation of the transport layer of a terminal connected to a wire network. The gateway device is provided with a control unit for controlling a connection in the radio transport layer protocol according an information regarding a radio communication state of the radio terminal device, where the information regarding the radio communication state of the radio terminal device is notified from either a radio base station device covering a radio service area in which the radio terminal device is located or a home location register for carrying out at least registration and management of the radio terminal device.Type: ApplicationFiled: July 8, 2002Publication date: December 12, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masahiro Takagi, Noriyasu Kato, Keiji Tsunoda, Kumiko Nakakita, Katsuya Nounin, Mutsumu Serizawa, Eiji Kamagata
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Patent number: 6418128Abstract: A communication scheme for improving the performance of communications utilizing the transport layer connection provided via a radio network, by enabling a control of the transport layer connection according to the radio communication state and property of the radio terminal, without changing implementation of the transport layer of a terminal connected to a wire network. The gateway device is provided with a control unit for controlling a connection in the radio transport layer protocol according an information regarding a radio communication state of the radio terminal device, where the information regarding the radio communication state of the radio terminal device is notified from either a radio base station device covering a radio service area in which the radio terminal device is located or a home location register for carrying out at least registration and management of the radio terminal device.Type: GrantFiled: September 21, 1998Date of Patent: July 9, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Takagi, Noriyasu Kato, Keiji Tsunoda, Kumiko Nakakita, Katsuya Noujin, Mutsumu Serizawa, Eiji Kamagata
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Publication number: 20020007414Abstract: A packet relay device for processing a request message of a prescribed protocol on behalf of a radio terminal is provided at a first sub-network which is capable of communications in the downlink direction with respect to the radio terminal only. Then, a request message encapsulated in an IP packer is transferred from the radio terminal to the packet relay device through the second sub-network which is capable of communications in both uplink direction and the downlink direction with respect to the radio terminal, and a response message corresponding to the request message is transferred from the packet relay device to the radio terminal, so that it becomes possible for the radio terminal to execute a prescribed protocol with respect to the first sub-network.Type: ApplicationFiled: April 27, 2001Publication date: January 17, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Atsushi Inoue, Eiji Kamagata, Masahiro Takagi, Masahiro Ishiyama, Noriyasu Kato, Naohisa Shibuya
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Patent number: 6301674Abstract: In supplying power to a plurality of electric apparatuses connected to a power line having a predetermined maximum consumable power, a power consumption of the power line is measured as a first power consumption. When a second power consumption predetermined in each of the electric apparatuses is told, a sum of the second power consumption and the first power consumption of the power line is compared with the predetermined maximum consumable power of the power line, and it is determined whether the second power consumption by the electric apparatus is permissible. A result of the determination is told to the electric apparatuses.Type: GrantFiled: December 8, 1999Date of Patent: October 9, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Saito, Eiji Kamagata, Yukio Kamatani, Yoshiaki Takabatake
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Patent number: 6272148Abstract: A highly reliable gateway device for improving the performance of communications utilizing the transport layer connection provided via a radio network, by setting up the transport layer connection between a wire terminal and a radio terminal in a form suitable for an application, or by enabling a control of the transport layer connection according to the radio communication state between the radio terminal and a base station, without changing implementation of the transport layer of a terminal connected to a wire network, is disclosed. The gateway device determines whether or not to carry out a set up of a connection in divided forms according to an information content of a packet that contains a transport layer protocol data unit requesting a set up of the transport layer connection between the radio terminal of the radio network and the wire terminal of the wire network.Type: GrantFiled: September 22, 1998Date of Patent: August 7, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Takagi, Eiji Kamagata, Noriyasu Kato
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Patent number: 6091733Abstract: A communication device/method inputs a first transport layer protocol data unit; creates a second transport layer protocol data unit based on the first transport layer protocol data unit, the second transport layer protocol data unit containing data as contained in the first transport layer protocol data unit and having a protocol data unit size different from a size of the first transport layer protocol data unit; and outputs the second transport layer protocol data unit to a network.Type: GrantFiled: December 29, 1997Date of Patent: July 18, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Takagi, Eiji Kamagata
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Patent number: 6018690Abstract: In supplying power to a plurality of electric apparatuses connected to a power line having a predetermined maximum consumable power, a power consumption of the power line is measured as a first power consumption. When a second power consumption predetermined in each of the electric apparatuses is told, a sum of the second power consumption and the first power consumption of the power line is compared with the predetermined maximum consumable power of the power line, and it is determined whether the second power consumption by the electric apparatus is permissible. A result of the determination is told to the electric apparatuses.Type: GrantFiled: September 10, 1997Date of Patent: January 25, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Takeshi Saito, Eiji Kamagata, Yukio Kamatani, Yoshiaki Takabatake
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Patent number: 5940769Abstract: In a radio communication system, communication for sending data from a transmitting station to a receiving station and communication for transmitting re-send data from the transmitting station to the receiving station according to the re-send request transmitted from the receiving station to the transmitting station are done on different occasions of communication. Hence, in the applications not requiring real time service, this re-send control method does not spend the power and radio resources wastefully, and by effectively utilizing the system resources and lowering the power consumption, the battery of the terminal may be reduced in size, so that the portability of the terminal may be enhanced.Type: GrantFiled: March 27, 1996Date of Patent: August 17, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Nobuyasu Nakajima, Koji Ogura, Mutsumu Serizawa, Yoshinari Kumaki, Katsuya Nounin, Eiji Kamagata, Takashi Wakutsu, Tsutomu Sugawara
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Patent number: 5924042Abstract: In a mobile communication system having plural cells for presenting plural types of communication service to plural mobile stations, information of allowance of delay of call connection is attached to a call to the mobile station, and when delay of call connection is not allowed as seen from this information of allowance, the mobile station is paged simultaneously through all cells in the location registration area, and when delay of call connection is allowed, the mobile station is paged sequentially in the unit of certain cells in the location registration area. Accordingly, the control traffic required for location registration and paging can be decreased.Type: GrantFiled: March 13, 1996Date of Patent: July 13, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Takafumi Sakamoto, Eiji Kamagata
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Patent number: 5802469Abstract: A portable terminal includes a first store for storing a first physical address including a serial number of the terminal, a second store for storing a first logical address including a subscriber's telephone number, a third store for storing a second physical address of a hardware used for computer communication, a fourth store for storing a second logical address corresponding to the second physical address, an interface for radio LAN, and an interface for PHS system. When a call is originated, a first channel is connected by using the first physical address and the first logical address. The second physical address and the second logical address are transmitted to the network from the call originator's terminal through the first channel, thereby setting in a state enabling communication between computers, and necessary data is transmitted to the call originator's terminal through a second channel by communication between computers.Type: GrantFiled: March 28, 1996Date of Patent: September 1, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Katsuya Nounin, Takashi Wakutsu, Nobuyasu Nakajima, Koji Ogura, Mutsumu Serizawa, Osamu Moriya, Tsutomu Sugawara, Eiji Kamagata, Yoshinari Kumaki