Patents by Inventor Keiji Usuba

Keiji Usuba 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).

  • Publication number: 20150063113
    Abstract: The present invention is contrived to implement more granular traffic control and improve a traffic control method. A traffic control method disclosed herein performs the following: with respect to a plurality of terminals that connect to a network and perform communication via a communication link, analyzing signaling during a session performed by each terminal from a time when a terminal initially connects to the network, thereby associating a terminal, an application, and signaling required for the application; generating control information including identifiers for implementing traffic control on a per-signaling basis, based on preconfigured information on an object that should be under traffic control and the analysis results; assigning to a received packet an identifier on a per-signaling basis based on the control information; and referring to the identifiers and the control information and performing a specified traffic control action on signaling included in the packet.
    Type: Application
    Filed: September 4, 2014
    Publication date: March 5, 2015
    Inventors: Akihiko YOSHIDA, Keiji USUBA
  • Publication number: 20150029841
    Abstract: A microburst detection apparatus configured to detect a microburst of a control plane packet and to extract, from the control plane packet which forms the detected microburst, call information for identifying call of a data plane, a packet extraction apparatus configured to extract a data plane packet corresponding to the extracted call information, and a cause analysis apparatus configured to analyze a payload of an application layer of the extracted data plane packet, specify a service/application which causes occurrence of the microburst, count the number of data plane packets in response to the specified service/application, and display the counted number of packets associated with the specified service/application are included.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 29, 2015
    Inventors: Daigo TAKAYANAGI, Keiji USUBA, Yosuke TAKAHASHI, Akihiko YOSHIDA
  • Publication number: 20120142351
    Abstract: A base station calculates numerical value data regarding hand-off quality by carrier and by neighbor station. The base station transmits the calculated numerical value data to a management apparatus. The base station receives an improvement instruction from the management apparatus, changes transmission electric power or a transmission direction of an electric wave of a carrier designated with the improvement instruction. The management apparatus determines an improvement subject base station and an improvement subject carrier from a management table using previously-set improvement determination conditions. The management apparatus transmits the improvement instruction to change the transmission electric power or transmission direction of the electric wave of the improvement subject carrier to the improvement subject base station.
    Type: Application
    Filed: November 21, 2011
    Publication date: June 7, 2012
    Inventors: Daigo TAKAYANAGI, Keiji USUBA, Tsuyoshi TAMAKI
  • Patent number: 8116263
    Abstract: An AN (Access Network) controlled by a communication control apparatus and communicating with a AT Access Terminal), wherein the AN receives control information including information for allocating communication information from the communication control apparatus, and the AN transmits transmission cycle information for transmitting the communication information in a predetermined transmission cycle to the AT and allocates the communication information in the predetermined transmission cycle based on the control information received from the communication control apparatus to send the communication information to the AT.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: February 14, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Patent number: 8094600
    Abstract: A radio communication system including: ANs (Access Networks) for wirelessly communicating with an AT (Access Terminal); and a communication control apparatus for controlling the AN, wherein the communication control apparatus includes: a control unit for sending transmission cycle information and control information to the AN, and wherein the AN includes: a memory for storing information necessary for transmitting the communication information to the AT; a control unit for transmitting the transmission cycle information received from the communication control apparatus to the AT, calculating a transmission slot number necessary for sending the communication information in the transmission cycle, determining a transmission timing indicating a period in the predetermined transmission cycle allocated for the communication information, and transmitting the communication information in the determined transmission timing to the AT.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: January 10, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Patent number: 8073381
    Abstract: A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: December 6, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Patent number: 7996033
    Abstract: A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: August 9, 2011
    Assignee: Hitachi Communication Technologies, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20100227634
    Abstract: A novel method for automatically determining adjoining base stations and storing the information on the adjoining base stations in these base stations is provided which, when a new base station is deployed, immediately sets the adjoining base station information and does not consume wireless resources. This method introduces a management device which, in automatically determining adjoining base stations, executes a decision logic that determines two base stations to be adjoining each other when the distance between the two base stations is smaller than the sum of the radii of coverage of the two base stations.
    Type: Application
    Filed: December 10, 2009
    Publication date: September 9, 2010
    Inventors: Daigo TAKAYANAGI, Keiji Usuba
  • Patent number: 7724724
    Abstract: In order to realize such communication control as to reliably reconstruct communication information transmitted from a plurality of ANs at a plurality of ATs even when a BCMCS flow is added or deleted, a radio communication system includes a transmitter for transmitting control information necessary for the ATs to receive the communication information from a radio communication system at intervals of a predetermined period, and a controller for controlling to transmit a plurality of pieces of communication information to the ATs at intervals of a constant cycle and in synchronism with a transmission period of the control information.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: May 25, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20090023382
    Abstract: A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
    Type: Application
    Filed: September 23, 2008
    Publication date: January 22, 2009
    Applicant: Hitachi Communication Technologies, Ltd.
    Inventors: Akihiko YOSHIDA, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20080181193
    Abstract: A radio communication system including: ANs (Access Networks) for wirelessly communicating with an AT (Access Terminal); and a communication control apparatus for controlling the AN, wherein the communication control apparatus includes: a control unit for sending transmission cycle information and control information to the AN, and wherein the AN includes: a memory for storing information necessary for transmitting the communication information to the AT; a control unit for transmitting the transmission cycle information received from the communication control apparatus to the AT, calculating a transmission slot number necessary for sending the communication information in the transmission cycle, determining a transmission timing indicating a period in the predetermined transmission cycle allocated for the communication information, and transmitting the communication information in the determined transmission timing to the AT.
    Type: Application
    Filed: March 26, 2008
    Publication date: July 31, 2008
    Inventors: Akihiko YOSHIDA, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20080181164
    Abstract: A radio communication system including: ANs (Access Networks) for wirelessly communicating with an AT (Access Terminal); and a communication control apparatus for controlling the AN, wherein the communication control apparatus sends transmission cycle information and control information to the AN, and wherein the AN transmits the transmission cycle information received from the communication control apparatus to the AT, allocates the communication information in the predetermined transmission cycle based on the control information received from the communication control apparatus to transmit the communication information to the AT, wherein, if the AN does not need to transmit any of plural pieces of the communication information to the AT for a subject period any longer, the AN uses the subject period to transmit any of other plural pieces of the communication information which is allocated to a next period.
    Type: Application
    Filed: March 26, 2008
    Publication date: July 31, 2008
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20080182612
    Abstract: A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
    Type: Application
    Filed: March 31, 2008
    Publication date: July 31, 2008
    Applicant: Hitachi Communication Technologies, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20080175218
    Abstract: An AN (Access Network) controlled by a communication control apparatus and communicating with a AT Access Terminal), wherein the AN receives control information including information for allocating communication information from the communication control apparatus, and the AN transmits transmission cycle information for transmitting the communication information in a predetermined transmission cycle to the AT and allocates the communication information in the predetermined transmission cycle based on the control information received from the communication control apparatus to send the communication information to the AT.
    Type: Application
    Filed: October 11, 2007
    Publication date: July 24, 2008
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Patent number: 7184661
    Abstract: According to the invention, in a transmission apparatus, there are provided an equipment supervision unit detecting an obstacle in the equipment and a switching control unit controlling the switching operation of transmission lines. When the equipment supervision unit detects condition in which obstacles have occurred in more than one groups of the cross connect unit or the clock unit in which paths provided are disconnected, the same K-bytes as in the case when SF failure is detected are outputted to all the fibers to be inputted to the equipment. Alternatively, an FS-R command is executed to both sides, or Line-AIS is inserted in all the outputted transmission lines, or an output is disconnected, so that the equipment is isolated and the paths provided through a node is relieved.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: February 27, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Keiji Usuba, Yoshimi Nakagawa, Satoko Araki, Yusuke Yajima
  • Patent number: 7054334
    Abstract: The invention has an object of enhancing the service capacity and the operability of a network and simplifying the maintenance and control of the network by adopting a size automatic change mode after a path is set and providing arbitrary pathsize at arbitrary time. To achieve the object, the following means is provided. The service capacity and the operability of a network are enhanced and the maintenance and control of the network are simplified by adopting a size automatic change mode that the size of an input path signal conforms to information written to line overhead H1 and H2 bytes and an output path signal is transmitted with the pathsize the same as the size of the input path signal. A case that receiving path size changes exceeding a band and the fault of a path is caused occurs by providing both modes of fixing pathsize and automating pathsize to a user, flexibly corresponding to various service and automatically changing pathsize.
    Type: Grant
    Filed: August 1, 2001
    Date of Patent: May 30, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Yoshimi Nakagawa, Satoko Araki, Takao Iwata, Takeshi Sato, Keiji Usuba
  • Publication number: 20050288025
    Abstract: A radio communication system includes a grouping unit for grouping a plurality of base stations into a plurality of groups (Soft Handoff Groups) and a determining unit for selecting base stations belonging to one and the same group selected from the groups produced by the grouping unit and for determining the base stations as base stations to send communication packets to an access terminal.
    Type: Application
    Filed: January 19, 2005
    Publication date: December 29, 2005
    Applicant: Hitachi Communication Technologies, Ltd.
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Publication number: 20050128996
    Abstract: In order to realize such communication control as to reliably reconstruct communication information transmitted from a plurality of ANs at a plurality of ATs even when a BCMCS flow is added or deleted, a radio communication system includes a transmitter for transmitting control information necessary for the ATs to receive the communication information from a radio communication system at intervals of a predetermined period, and a controller for controlling to transmit a plurality of pieces of communication information to the ATs at intervals of a constant cycle and in synchronism with a transmission period of the control information.
    Type: Application
    Filed: November 4, 2004
    Publication date: June 16, 2005
    Inventors: Akihiko Yoshida, Shiro Mazawa, Kiyoshi Kawamoto, Yosuke Takahashi, Keiji Usuba
  • Patent number: 6614754
    Abstract: A bi-directional line switched ring network system including a plurality of optical fiber communications lines and a plurality of nodes connected by the plurality of optical fiber communications lines forming a closed circuit. Each of the nodes performs an addition and a drop of a path between an external communications apparatus and the optical fiber communications lines or permits the path on the optical fiber communications lines to pass through, or performs a change of a direction of the path. A control unit is located in each of the nodes to control the addition, the drop, the pass-through and the direction change of the path. When the path passes through each of the nodes, the control unit sets a time slot number of the path in being inputted into the node and a time slot number of the path in being outputted from the node independently of each other.
    Type: Grant
    Filed: April 27, 1999
    Date of Patent: September 2, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Keiji Usuba, Masatoshi Takahashi, Mitsunobu Kimura, Seigo Obayashi, Takashi Mori
  • Publication number: 20020075863
    Abstract: The invention has an object of enhancing the service capacity and the operability of a network and simplifying the maintenance and control of the network by adopting a size automatic change mode after a path is set and providing arbitrary pathsize at arbitrary time. To achieve the object, the following means is provided. The service capacity and the operability of a network are enhanced and the maintenance and control of the network are simplified by adopting a size automatic change mode that the size of an input path signal conforms to information written to line overhead H1 and H2 bytes and an output path signal is transmitted with the pathsize the same as the size of the input path signal. A case that receiving path size changes exceeding a band and the fault of a path is caused occurs by providing both modes of fixing pathsize and automating pathsize to a user, flexibly corresponding to various service and automatically changing pathsize.
    Type: Application
    Filed: August 1, 2001
    Publication date: June 20, 2002
    Inventors: Yoshimi Nakagawa, Satoko Araki, Takao Iwata, Takeshi Sato, Keiji Usuba