Ntt Docomo, Inc.

Hitachi, Ltd.

Hitachi High-tech Instruments Company, Ltd.

Ken Igarashi

Atsushi Iwasaki

Toshihiro Suzuki

Hiroshi Kawakami

Shinichi Isobe

Takashi Koshimizu

Satoshi Hiyama

Kenichi Yamazaki

Kenji Nishimura

Makoto Sasaki

Shoichi Hirata

Daisuke Ochi

Satoru Imai

Mana Kaneko

Harunobu Fukazawa

Masami Yabusaki

Kentaro Saito

Ulas C Kozat

Yuichi Kaneko

Yugo Watanabe

Hideharu Suzuki

Shin-ichi Isobe

Yuki Moritani

Manabu Okamoto

Yasuhisa Hayashi

Junko Hosoda

Masashi Yamashita

Takafumi Chida

Koichi Izuhara

So Ishida

Kazunori Yamamoto

Haruhiko Yamaguchi

Akihito Okura

Dwight Leu

Attila Lengyel

A host providing system includes a physical host network switch which determines permission and non-permission of communication on the basis of whether or not information pieces indicating users correlated with information indicating a transmission source and information indicating a transmission destination included in communication data from a physical instance match each other, and controls the communication data on the basis of a determination result. Accordingly, since only communication between instances of the same user is permitted, and thus communication from a physical instance is appropriately controlled, it is possible to ensure security in the system.

Host providing system and communication control method

A host providing system includes a physical host managing node which controls one or more physical servers and can manage a usage state of a physical host formed in the physical server, and thus the physical server for forming a physical host can be controlled in the system. In addition, a single physical host managing node is selected depending on instance type information included in an instance starting request from a user terminal, and the instance starting request is sent to the selected physical host managing node. Accordingly, it is possible to provide a physical instance complying with a user's request as a physical host.

Host providing system and host providing method

A method and apparatus is disclosed herein for live replication. In one embodiment, the method comprises replicating a source server to create a replica server, assigning a routable Internet Protocol (IP) address to the replica server; and migrating one or more, but not all, on-going connections from the source server to the replica server.

Method and apparatus for live replication

A mobile communications system for transferring packets to a mobile communications terminal according to address information of the mobile communications terminal is disclosed. The mobile communications terminal is located in a moving network connected to a given node in a core network. The address information of the mobile communications terminal includes common information related to the given node to which the moving network is connected, and individual information which is unrelated to the given node to which the moving network is connected and is unchanged when the given node to which the moving network is connected is changed.

Mobile communications system, mobile communications method, server, transfer device, and mobile communications terminal

Transmission of excess segments to a network can be effectively inhibited. A received byte calculation sectioncalculates, at a sending side, the number of bytes of segments which arrive at a receiving side within a period of a minimum value of RTT measured by a minimum time measurement section, a target calculation sectioncalculates a target used for controlling segment transmission based on the number of bytes of the received segments calculated by the received byte calculation section, and a send segment control sectionwhich controls segment transmission based on the target calculated by the target calculation section

Communication terminal, communication control method, and communication control program

A mobile communication systemaccording to the present invention comprises handover control apparatusand radio terminal unit. The handover control apparatuscontrols handover of a radio terminal unitbetween access routers-provided in respective base stations-for radio communication with the radio terminal unit. The handover control apparatuscounts the number of relay routers for every candidate access router-for a destination of the radio terminal unit, from a gateway deviceand determines a COR on the basis of the number of relay routers for every access routerthus counted.

Handover control apparatus, relay router, gateway apparatus, access router, base station, mobile communication system, and handover control method

Technology is provided for changing a mounting angle of a component to reduce the amount of relative displacement between a mounting head and a board. A component, for which a mounting angle can be changed, is specified based on information stored in a mounting data storage area and a component data storage area according to a predetermined component mounting order. A mounting time in a mounting path with the mounting angle of the specified component being changed is calculated for each mounting angle to specify the mounting path requiring the shortest mounting time.

Setting device, component mounting system, program and calculating method

A communication terminal device includes: a path information manager unit for managing TCP control information related to each of the plurality of paths; a transmission segment manager unit for storing segments generated by dividing data to be transmitted to the receiving terminal device; and a segment transmitter unit for extracting the segment from the transmission segment manager unit and transmitting the extracted segment to the receiving terminal device. The transmission segment manager unit makes a reservation for transmission of the segment based on the TCP control information, by storing the segment in association with a path used for the transmission of the segment, and the segment transmitter unit extracts the segment from the transmission segment manager unit and transmits the extracted segment to the receiving terminal device along the path associated with the segment.

Communication terminal device and communications method

The congestion in a network can be avoided by effectively utilizing a prepared network band even in a network where reception intervals of acknowledgments are not correct. According to the information about Ack or Sack (selective acknowledgment) received in a time of the minimum value of an RTT (rtt_min), the number of bytes of received segments (rcv_bytes) for which a receiving side acknowledges the reception is counted, and a received byte number setting unitsets a congestion window (CWND) or a slow start threshold (SSTHRESH) when a packet loss occurs according to the number of bytes of received segments (rcv_bytes) counted by a received byte number counting unitwhen a packet loss is detected by a loss detection unit

Communication terminal, congestion control method, and congestion control program

A QoS controller, in an IP network having one or more routers, is disclosed. The controller includes a storing unit configured to assign a first bit area and a second bit area within a field in an IP header of an IP packet. The storing unit stores first bits for controlling the routers into the first bit area and second bits for routing at the routers into the second bit area. A reporting unit is configured to report to the routers the first bits and the second bits stored by the storing unit.

Method of controlling QoS in IP network using router control and multi-path routing

A retransmission control method of the present invention includes the steps in which a receiving terminal: measures a round trip time (RTT) between the receiving terminal and a sending terminal; calculates an RTO by using the measured RTT; and starts a time counting operation of the RTO upon reception from a point in time when a segment is received from the sending terminal; transmits a segment prompt signal which prompts the sending terminal to transmit a segment, when the segment is not received from the sending terminal until the RTO is completed, and in which the sending terminal: retransmits a segment to the receiving terminal when there is a segment to be retransmitted; and transmits a data-less signal to the receiving terminal when there is a segment that should be retransmitted, the data-less signal indicating that there is no segment that should be retransmitted.

Communication terminal and retransmission control method

A network management server includes an address manager and an address assignment direction transmitter. The address manager manages a first address, a second address and a third address of the destination mobile terminals in accordance with address assignment information received from a mobile node. The address assignment direction transmitter transmits an address assignment directions for directing a source access node to manage the first address and the second address of the destination mobile terminal, and to transmit an address assignment direction for directing a destination access node to manage the second address and the third address of the destination mobile terminal.

Mobile communication control system, network management server, mobile node, access node and anchor node

Rerouting of packet exchanges by a mobile terminal is controlled so as to be optimized on a real time basis to prevent network resources from being wasted by redundant routing. In an initial state a route of data from a mobile communication terminal M to a CN, which is a communication partner, is a route R. Then, an access router (AR)acquires the number of hops of data received from the CNby the mobile communication terminal M. As the mobile communication terminal M now performs a handover to under the command of the AR, the route will change to a route R. Then the ARdetects that the route becomes redundant by the fact that the number of hops acquired after the shift is greater than the pre-shift number of hops received from the AR, and invokes control to reroute to a route R, which provides the optimal routing.

Method, terminal and router for detection of trigger to rerouting

A production plan is created so as to minimize risk of demand variations. Forecasted values of amounts of requests are entered for each different item of products, markets, dates, past accuracy of demand forecasts, and order achievements at the time when the plan is created. Scenario information is created in which assumable amounts of request for each different item of the products, markets, and dates and probabilities at which the amounts of requests agree with actual amounts of requests are defined. Management indexes are found from the amount of stockout and amount of stock calculated in each different scenario, based on the scenario information, target values of the management indexes, and information on strongpoints. An amount of production that maximizes the achievement ratios of the management ratios to their targets within the ranges of supplied materials and within the range of the production capacity is calculated by an optimization algorithm.

Method of creating production plan of demand variation input type and method of creating production plan minimizing risk of demand variations

A communication system () is provided with URs (to) and a source terminal (). The URs (to) include: entry holders (to) for holding forwarding addresses; message processors () for registering the addresses of other URs, the addresses being associated with a source terminal address and a multicast group address, in the entry holders (to) as the forwarding addresses; message providers () for providing the source terminal address with join request messages which request the addition of the addresses of the URs to sending addresses. The source terminal () includes: an entry holder () for holding a sending address; and a message processorfor registering the addresses of the URs (to) in the entry holderas sending addresses based on the join request messages.

Growing community of inventors

Yokohama, Japan

Ken Igarashi