Patents by Inventor Norihiro Ishikawa

Norihiro Ishikawa 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).

  • Patent number: 7970933
    Abstract: An ad hoc network is configured of a plurality of nodes. The node includes: a link setting unit configured to set a plurality of links to a plurality of adjacent nodes on a one-to-one basis; a Bloom filter storage unit configured to store a Bloom filter in association with each of the links existing in linked destinations, the Bloom filter generated by using, as a key, a node identification uniquely identifying each of the nodes exiting in linked destination; and a data transmitter configured to use the stored Bloom filters as routing information at a time of data transmission.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: June 28, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Tomoyuki Osano, Yoshitaka Uchida, Norihiro Ishikawa
  • Patent number: 7870292
    Abstract: The network topology generation method can reduce a network delay fairly and minimally, upon generating a new network topology, by considering a network condition in a physical layer. The network topology generation method includes establishing a virtual connection between the new node and each of the plurality of nodes; calculating an average metric value of routes from the new node to the plurality of nodes via each of the virtual connections; and establishing a connection between the new node and the node to which the virtual connection having the smallest average metric value is established, so that the new node joins the network.
    Type: Grant
    Filed: December 24, 2004
    Date of Patent: January 11, 2011
    Assignee: NTT DoCoMO, Inc.
    Inventors: Haoyi Wan, Norihiro Ishikawa
  • Patent number: 7720080
    Abstract: A relay unit capable of inquiring of a DNS comprises: an inquiry section which transfers an acquisition request of a transmission destination terminal address, sent from a transmission source terminal, to the DNS, and acquires the transmission destination terminal address and a transmission destination label corresponding to the transmission destination terminal address and transmission destination terminal; a label creation section which creates a unique relay label; a label storage section which correlates the created relay label to the acquired transmission destination terminal address and transmission destination label, and stores thus obtained label; a label transmission section which transmits the relay label and a private address of the relay unit to the transmission source terminal; and a determination section which, if a packet containing the relay label is received from the transmission source terminal, determines that the transmission destination terminal address and transmission destination label
    Type: Grant
    Filed: February 8, 2006
    Date of Patent: May 18, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yoshitaka Uchida, Norihiro Ishikawa
  • Patent number: 7496051
    Abstract: A node includes a manager configured to manage the hash value of the node and the hash values of adjacent nodes, and a calculator configured to calculate an insertion position of a new entry node in a ring network, based on the hash value of the new entry node, the hash value of the node and the hash values of the adjacent nodes.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: February 24, 2009
    Assignee: NTT DoCoMo, Inc.
    Inventors: Haoyi Wan, Norihiro Ishikawa, Hiromitsu Sumino, Takeshi Kato, Eiji Omata
  • Publication number: 20080126565
    Abstract: An ad hoc network is configured of a plurality of nodes. The node includes: a link setting unit configured to set a plurality of links to a plurality of adjacent nodes on a one-to-one basis; a Bloom filter storage unit configured to store a Bloom filter in association with each of the links existing in linked destinations, the Bloom filter generated by using, as a key, a node identification uniquely identifying each of the nodes exiting in linked destination; and a data transmitter configured to use the stored Bloom filters as routing information at a time of data transmission.
    Type: Application
    Filed: June 29, 2007
    Publication date: May 29, 2008
    Applicant: NTT DoCoMo, Inc.
    Inventors: Tomoyuki OSANO, Yoshitaka Uchida, Norihiro Ishikawa
  • Publication number: 20080016224
    Abstract: The object of the present invention is to provide a network topology generation method which can reduce a network delay fairly and minimally upon generating a new network topology, by considering a network condition in a physical layer. The network topology generation method includes establishing a virtual connection between the new node and each of the plurality of nodes; calculating an average metric value of routes from the new node to the plurality of nodes via each of the virtual connections; and establishing a connection between the new node and the node to which the virtual connection having the smallest average metric value is established so that the new node joins the network.
    Type: Application
    Filed: December 24, 2004
    Publication date: January 17, 2008
    Applicant: NTT DoCoMo, Inc.
    Inventors: Haoyi Wan, Norihiro Ishikawa
  • Patent number: 7139975
    Abstract: A document conversion method for converting a first structured document F1, formed based on a first document type definition D1, to a second structured document F3, formed based on a second document type definition D2, the document conversion method including analyzing the document type definition D1 and document type definition D2 and extracting a difference document type definition, generating a conversion template T2 described therein a conversion rule which prevents the structured document F3, which is the result of document conversion process, from being contradictory to the document type definition D2, based on the results of the analysis, and performing document conversion process using the conversion template T2.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: November 21, 2006
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hideharu Suzuki, Norihiro Ishikawa, Hidetoshi Ueno, Hiromitsu Sumino, Takeshi Kato
  • Publication number: 20060209855
    Abstract: A relay unit capable of inquiring of a DNS comprises: an inquiry section which transfers an acquisition request of a transmission destination terminal address, sent from a transmission source terminal, to the DNS, and acquires the transmission destination terminal address and a transmission destination label corresponding to the transmission destination terminal address and transmission destination terminal; a label creation section which creates a unique relay label; a label storage section which correlates the created relay label to the acquired transmission destination terminal address and transmission destination label, and stores thus obtained label; a label transmission section which transmits the relay label and a private address of the relay unit to the transmission source terminal; and a determination section which, if a packet containing the relay label is received from the transmission source terminal, determines that the transmission destination terminal address and transmission destination label
    Type: Application
    Filed: February 8, 2006
    Publication date: September 21, 2006
    Applicant: NTT DoCoMo, Inc.
    Inventors: Yoshitaka Uchida, Norihiro Ishikawa
  • Publication number: 20050254429
    Abstract: There is installed a special management node to efficiently perform network configuration management. When a node starts communication with another node, the node sends a request for node position information about the communication counterpart node to a management node. Upon receiving the node position information request, the management node references a network configuration information table to calculate information about a route from the node to the communication counterpart node. The management node notifies the calculated route information. By utilizing the route information, the node can communicate with the communication counterpart node. Each node notifies node-to-node connection information, information about links with adjacent nodes, to the management node as necessary.
    Type: Application
    Filed: June 3, 2003
    Publication date: November 17, 2005
    Inventors: Takeshi Kato, Norihiro Ishikawa, Hiromitsu Sumino, Hideharu Suzuki, Jodetoshi Ueno, Eiji Omata
  • Publication number: 20050237948
    Abstract: A node includes a manager configured to manage the hash value of the node and the hash values of adjacent nodes, and a calculator configured to calculate an insertion position of a new entry node in a ring network, based on the hash value of the new entry node, the hash value of the node and the hash values of the adjacent nodes.
    Type: Application
    Filed: January 10, 2005
    Publication date: October 27, 2005
    Applicant: NTT DoCoMo, Inc.
    Inventors: Haoyi Wan, Norihiro Ishikawa, Hiromitsu Sumino, Takeshi Kato, Eiji Omata
  • Patent number: 6954714
    Abstract: It is an object of the invention to measure a communication data volume for each service type in measuring a communication data volume in a charging process and the like. The invention comprises a plurality of measuring points 131 to 133 for measuring a communication data volume and a data relaying apparatus 120 for transmitting received data to any of the plurality of measuring points 131 to 133. The data relaying apparatus 120 has a service-type judging means 121 for judging the service type of the received data, a measuring point determining means 122 for determining the measuring points 131 to 133 to which the data is to be transmitted based on the service type and a data transmission means 122 for transmitting the data to the measuring point thus determined, and each of the plurality of measuring points 131 to 133 has a communication data measuring means for measuring the communication data volume of the data received from the data relaying apparatus 120.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: October 11, 2005
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hideharu Suzuki, Hiromitsu Sumino, Norihiro Ishikawa, Hidetoshi Ueno
  • Publication number: 20030108057
    Abstract: It is an object of the invention to measure a communication data volume for each service type in measuring a communication data volume in a charging process and the like. The invention comprises a plurality of measuring points 131 to 133 for measuring a communication data volume and a data relaying apparatus 120 for transmitting received data to any of the plurality of measuring points 131 to 133. The data relaying apparatus 120 has a service-type judging means 121 for judging the service type of the received data, a measuring point determining means 122 for determining the measuring points 131 to 133 to which the data is to be transmitted based on the service type and a data transmission means 122 for transmitting the data to the measuring point thus determined, and each of the plurality of measuring points 131 to 133 has a communication data measuring means for measuring the communication data volume of the data received from the data relaying apparatus 120.
    Type: Application
    Filed: January 28, 2003
    Publication date: June 12, 2003
    Inventors: Hideharu Suzuki, Hiromitsu Sumino, Norihiro Ishikawa, Hidetoshi Ueno
  • Publication number: 20030093760
    Abstract: This invention aims at reducing an total time required for document conversion by outputting an appropriate document data which matches a document type definition after conversion so as to omit a validity verification step in the document structure conversion.
    Type: Application
    Filed: November 12, 2002
    Publication date: May 15, 2003
    Applicant: NTT DoCoMo, Inc.
    Inventors: Hideharu Suzuki, Norihiro Ishikawa, Hidetoshi Ueno, Hiromitsu Sumino, Takeshi Kato
  • Publication number: 20020178235
    Abstract: A multicast packet distribution method used for distributing a packet from an origination host to a destination host belonging to a multicast group via communication nodes in a packet communication network that includes a plurality of domains is provided. The multicast packet distribution method includes the steps of: sending a packet to a multicast group in a domain from the origination host; transferring the packet to the domain via a communication node in the outside of the domain according to a unicast routing procedure; and wherein, when a predetermined communication node in the domain receives the packet, the predetermined communication node transfers the packet to the destination host according to a multicast routing procedure.
    Type: Application
    Filed: May 3, 2002
    Publication date: November 28, 2002
    Applicant: NTT DoCoMo, Inc.
    Inventors: Hidetoshi Ueno, Norihiro Ishikawa, Hideharu Suzuki
  • Patent number: 6343284
    Abstract: The present invention discloses an Internet billing method which can reject invalid orders with reliability, and which can be used without a credit card. In the present invention, a terminal makes a request of a content server for a chargeable service by using a prepaid information medium which has predetermined information necessary for transactions. After the request, the content server makes a request of a prepaid information management server for authentication to check whether the prepaid information medium is authorized to be used for the chargeable service, and for billing for the prepaid information medium. Then, the prepaid information management server authenticates the prepaid information medium and performs the billing for the prepaid information medium on the basis of usage of the chargeable service. If the authentication and the billing succeed, the content server provides the chargeable service to the terminal.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: January 29, 2002
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Norihiro Ishikawa, Toshihiko Suguri, Masuo Yoshimoto