Ntt Docomo, Inc.

Koji Omae

Hideaki Takahashi

Ichiro Okajima

Narumi Umeda

Takehiro Ikeda

Masahiro Inoue

Yoichi Matsumoto

Kengo Yagyu

Atsushi Fujiwara

Shinji Takeda

Hidenori Aoki

Takuya Shinozaki

Kazuhiro Takagi

Midori Mori

Kiyotaka Hori

Ryoichi Kobayashi

Yasutaka Sakon

Information-processing device transmits biological information not being encrypted in association with an application ID to information delivery server device, and transmits encrypted biological information in association with a user ID to backup server device. Advisory terminal accepts an input of advice according to a user data set stored in information delivery server device. Client terminal downloads the advice according to the user data set from information delivery server device.

Information-processing device, service-providing system, service-providing method, and computer program

In adjusting transmission timings of frames sequentially transmitted from a radio network controller to a base transceiver station, the frame transmission schedule is changed in appropriate manner in response to a necessary Timing Adjustment control frame (TA). In a first period of time, which is a period of ignoring the received TA, the adjustment of the transmission timings of the frames is suspended. Also, out of the first period, the first period is varied in accordance with a variety of the delayed amount in transmission between the radio network controller and the base transceiver station. There is provided a period of ignoring a first control frame to be informed from the radio base transceiver station to the radio network controller. By setting the period to be a variable value, the synchronization control is accomplished with certainty.

Radio network controller and frame transmission adjusting method

A channel allocation method for dynamically allocating channels of a plurality of radio interfaces at each access point included in a mesh network is provided. The method includes the steps of (a) acquiring, at each access point, in-node information about the access point itself, and (b) grouping high-traffic access points in a cluster using a same channel set based on the acquired information.

Channel allocation for access point in mesh network

The present invention provides a packet communication system including a mobile host, a home agent, a correspondent host, and a mobility agent, where the mobility agent operates in such a way that when the mobile host is in an active mode and has no need for buffering packets, the mobility agent forwards packets received from the home agent or the correspondent host to the mobile host; and alternatively, in the case when the mobile host is in an active mode, but requires buffering of packets, the mobility agent buffers the packets, and further in the case when the mobile host is in an idle mode, the mobility agent buffers the packet and notifies the mobile host of arrival of the packet, in order to prevent the loss of a packet addressed to a mobile host thus decreasing the traffic and the transmission frequency of Binding Update packets.

Packet communication system

A mobile communication system comprises a plurality of transfer devices configured to transfer packets to a visited position of a mobile terminal, a plurality of connection management devices arranged in a network and configured to connect to the mobile terminal, and a mobile terminal including a detection unit configured to detect the transfer device, and a communication unit configured to connect to the connection management device, and transmit/receive packets to/from the transfer device detected by the detection unit via the connection management device.

Mobile communication system, mobile terminal transfer device, and mobile communication method

In a content distribution method, two or more certification marks () are produced for the content to be delivered, each of the certification marks containing a temporary access information item defining an accessing right to the content. Each of the certification marks is distributed to a user at a shop. In a content delivery server, two or more content delivery information items are stored in association with the content, each of the delivery information items containing said temporary access information item. A network device () reads the temporary access information item from the certification mark purchased by the user. The network device accesses the content delivery server () using the temporary access information item, and receives the content from the content delivery server.

Content distribution system and method

There is disclosed a link manager comprises detecting unit for detecting what link is installed; managing unit for defining a plurality of link metrics indicating characteristics of each link detected and managing data corresponding to the respective link metrics on a table; and selecting unit for selecting a link having link metrics complying with a given condition.

Link manager and link management method

A security group management system includes a cellular mobile station (), two or more devices () belonging to a group, and a group management server (). The group management server comprises a storage unit () configured to store information about the cellular mobile station registered by a member of the group and group information about the group in advance; and a group information providing unit () configured to supply the group information in response only to an access from the registered cellular mobile station. The cellular mobile station has a group information transmission unit () configured to supply the group information to the devices so as to allow the devices to recognize that the devices belong to the group and to perform secure mutual connection and/or resource sharing among the devices.

Security group management system

A packet transmission control apparatus has a packet accumulating unit for buffering a plurality of packets. The apparatus further includes a transmission unit for and for transmitting, to a destination node, a front packet included in the plurality of packets buffered in the packet accumulating unit and for transmitting the remaining packets included in the plurality of packets to the destination node after a lapse of a time period starting from a time point of transmission of the front packet. The time period is equal or greater than a sum of predetermined downstream front packet processing time periods, the sum corresponding to a number of nodes the front packet passes through before reaching the destination node.

Packet transmission control apparatus, mobile node, control node, packet communication method, and packet communication system

A communication system includes a MN for transmitting a request for information which specifies a MAP to be used for packet reception and anycast address regarding a plurality of MAPs to a given AR connected to the MN, routers for transmitting the request to a MAP which has a shortest distance from the given AR based on the anycast address transmitted from the given AR, and each of the MAPS for transmitting the information which specifies the MAP to the MN.

Mobile node for transmitting a request for information which specifies a transfer device to be used

In a packet communication system() comprised of nodes and links, a destination node() as a destination of a packet transmitted from correspondent node() is provided with an advertisement receiving device() for receiving an advertisement of path information about a path from the correspondent node() to the destination node(); a Path MTU discovery execution determining device() for determining whether a discovery of a Path MTU of the path from correspondent node() to destination node() should be executed, based on the path information; a Path MTU setting device() for setting the Path MTU on the basis of the path information; and a Path MTU announcing device() for announcing the Path MTU set by the Path MTU setting device().

Node, correspondent node, mobility anchor point, and home agent in packet communication system, packet communication system, and path MTU discovery method

A mobile node having two or more interfaces, a control method of the mobile node, and a mobile node control program are disclosed. The mobile node includes a generating unit to generate control information for each interface, an information providing unit for providing the control information provided by each interface to an upper layer, and a routing controlling unit to perform at least one of determining connectivity, and updating a routing based on the provided control information.

Mobile node, a control method thereof, and a mobile node control program

Provided is a mobility management node capable of forming a paging area, without need for management of a migration history at a mobile node and for notification of a migration history from a mobile node to a network. In mobility management node (MAP), mobility managerlets binding cachestore a home address and a c/o address of each mobile node (MN) in correlation with each other. Migration history storagestores a transition frequency of the c/o address stored in binding cachein correlation with prefixes before and after transition. Migration history storagedefines paging area information by a set of prefixes included in combinations containing common prefixes, out of combinations of prefixes before and after transition with each of which a transition frequency over a predetermined reference value is correlated. Paging controllernotifies the MN of this paging area information.

Mobility management node, paging area forming method, and mobility management program

A mobile node (MN) transmits a () echo request to the effect that the source address is set to be a new care of address (nCoA) right after transmitting a () binding update (BU) for a home agent (HA). The nAR having received the () echo request intends to transmit an echo reply to the nCoA being the source address of the echo request. However, at this time, since an entry regarding the nCoA does not exist in a neighbor cache of the nAR, the nAR transmits () neighbor solicitation (NS) to the MN, and generates a neighbor cache entry of the nCoA. After this, at the time when a binding acknowledgment (BA) has arrived at the nAR, since the entry of the nCoA exists, the () BA and data packets () to () arriving at the nAR following the () BA are transferred to the MN without buffering in the nAR, corresponding to the entry of the nCoA generated at the time of transmission of the () echo reply.

Growing community of inventors

Yokohama, Japan

Koji Omae