National Institute of Information and Communications Technology, Incorporated

Stanislav Filin

Homare Murakami

Kentaro Ishizu

Ha Nguyen Tran

Goh Miyamoto

Hiroshi Harada

Chen Sun

Yohannes Alemseged Demessie

A technique that can effectively utilize unused wireless link and realize high-quality wireless communication between a communication terminal and a base station and enables efficient distribution of radio resources over an entire wireless communication system is provided. A wireless communication system in which a base station and a communication terminal can conduct wireless communication by detecting a usable wireless link and changing a wireless link used for the connection is also provided. On the communication network side, in addition to a plurality of wireless communication networks and a base station, a server device is provided. Connection-method reconstruction management means for determining a connection method of the wireless communication on the basis of communication condition information including information on usable wireless link at current locations of the base station and the communication terminal and connection-method reconstruction control means for controlling the connection method of the wireless communication for the corresponding base station are provided.

Wireless communication system and method of wireless communication

Object: To provide a mechanism and a function of a system that can determine a communication method and the like effectively utilizing frequency resources, considering priority of each communication, in a cognitive communication network system of a frequency shared type or the like assuming that a given frequency band is shared by a plurality of systems in use. Solution: In a configuration in which a cognitive communication network system has a plurality of radio access networksand a superior communication networkthat provides a common platform at least to the radio access networks, in a plurality of base stationson at least a part of the radio access network, base-station state obtaining meansthat collect information relating to a state of the base station itself in the base station or a communication state and base-station communication reconfiguration managing meansthat reconfigure at least one of either a selection of the base station to be used in the communication or a communication condition in the base station on the basis of the information collected by the base-station state obtaining means are provided.

Cognitive communication network system and communicating method thereof

Embodiments of the invention enable a large number of wireless communication networks to be efficiently used while the size of a device operated by a user is reduced and power is saved by providing a communication terminal whose connection with different wireless communication networks can be dynamically reconfigured. A communication terminal whose connection with a plurality of wireless communication networks can be dynamically reconfigured is provided with a data communication aggregation device, a communication application executing device, and a local communication path therebetween. The data communication aggregation device interfaces with the plurality of wireless communication networks and communicates with the communication application executing device through the local communication path. The communication application executing device executes an application for communicating with an outside communication network.

Communication terminal and communication network system

The present invention provides a user-carriable mobile communication relay device that relays communication between an internal network and an external network, in which even when the device is moved, the device dynamically selects and connects the external network depending on a surrounding radio wave environment or a communication content. The device is provided with an internal network communication adaptercompatible with the internal network connecting to a specific terminal deviceexternal network communication adapterscompatible with external networks with a mobile telephone network and with a wireless LAN at an installation site; a network selection processing portionautomatically selecting one or more networks to be connected, out of the external networks, according to stored profile informationan internal network connection processing portionestablishing or reconfiguring the connection to an internal network selected for a predetermined opportunity; an external network connection processing portionestablishing or reconfiguring the connection to an external network selected for a predetermined opportunity; and a communication relay processing portionrelay-processing communication between the internal network and the external network.

Mobile communication relay device

To reduce power consumption for scanning and maintain communication quality by reducing the time for scanning or connection when a wireless communication terminal switches between networks or base stations. A wireless communication terminalenabling connection with a plurality of base stations disposed in different positions which includes a base station scanning unitdetecting and scanning a base station capable of communication at the current position of the wireless communication terminal, a simultaneous detection base station recording unitrecording simultaneously detected base stations as simultaneous detection information in a storage unit, a connection candidate extraction unitand a first communication unitperforming communication by connection with the extracted connection candidate base station. Based on the simultaneous detection information, the connection candidate extraction unitextracts a base station having the possibility of simultaneous detection with the currently connected base station as a connection candidate base station.

Wireless communication terminal and wireless communication system

To provide a method of selecting an optimal base station for each application when accumulating communication quality in response to an application type for a base station and a communication terminal switches base stations. A communication quality databaseis prepared by assigning a current location of a communication terminal device, a currently running application program and a communication quality when executing an application program. When making a new connection with a base station, the current application and location is used to select a base station having an optimal communication quality from the communication quality database. This mechanism may be provided in the communication terminal device or may be provided as a communication system including a server device.

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Koganei, Japan

Stanislav Filin