Nippon Telegraph and Telephone Corporation

Ntt Corporation

Toshiro Nakahira

Hirantha Abeysekera

Koichi Ishihara

Tomoki Murakami

Yasushi Takatori

Takafumi Hayashi

Shoko Shinohara

Kazutaka Hara

Tomohiro Taniguchi

Ryota Shiina

Yasuhiko Inoue

Shinya Tamaki

Riku Omiya

Keisuke Wakao

Akiyoshi Inoki

Daisuke Goto

Takatsune Moriyama

Mamoru Akimoto

Motoharu Sasaki

A wireless communication system includes a wireless base station that performs wireless communication with a wireless terminal; and a wireless communication control station that is communicably connected to the wireless base station. The wireless communication control station includes a determination unit that determines a requirement that is prioritized among multiple types of requirements in wireless communication, a setting unit that sets the information indicating the parameter to be used for communication control by the wireless base station, and a transmission unit that transmits the information set by the setting unit to the wireless base station.

Wireless communication system, and wireless communication control apparatus, and method

In a wireless communication system including a plurality of base stations to which terminal stations are connectable, and a monitoring station which monitors each of the base stations, the monitoring station includes an information collection unit configured to collect wireless environment information including a plurality of information items indicating wireless environments around the base stations and the terminal stations, from each of the base stations, a defect detection unit configured to detect whether or not one or more defects occur based on a combination of the information items, and a defect determination unit configured to determine estimated occurrence probabilities of the defects detected by the defect detection unit based on a combination of the information items.

Wireless communication system, monitoring station, defect detection method, and wireless communication program

A radio signal strength information calculation method performed by a control apparatus includes: calculating radio information regarding each of a plurality of meshes into which an area where base stations are placed is divided and generating mesh radio information; and placing a virtual base station at a position to where any of the base stations would be moved in the area, and calculating radio signal strength information between a plurality of base stations including the base stations and the virtual base station based on the mesh radio information.

Radio signal strength information calculation method, control apparatus and program

A radio communication method of connecting a base station with a plurality of terminal stations, the base station including a plurality of radio communication units compatible with a plurality of communication standards or communication schemes, the method including collecting, from each of the plurality of terminal stations, communication quality information representing a communication quality of the terminal station, collecting, from each of the plurality of terminal stations, communication performance information representing a communication performance of the terminal station, collecting, from each of the plurality of terminal stations, identifier information that identifies the terminal station, calculating, based on the communication quality information, the communication performance information and the identifier information that are collected, a setting policy including a setting for each of the plurality of radio communication units, and a switching policy of setting a condition for switching the plurality of radio communication units, and setting, for each of the plurality of radio communication units, the terminal station to be connected based on the setting policy and the switching policy that are calculated.

Wireless communication method, base station, and wireless communication system

A wireless communication system includes a plurality of base stations to which terminal stations are connectable, and a base station control device controlling each of the base stations. The base station control device includes an information collection unit collecting wireless environment information indicating wireless environments around the base stations and the terminal stations from each of the base stations, and a policy calculation unit calculating a policy for connecting the base stations and the terminal stations based on the wireless environment information. Each of the base stations includes receiver receiving the calculated policy a destination calculation unit calculating a destination to which a terminal station left unaccommodated is to be connected based on the received policy, and a transmitter transmitting the received policy and the calculated destination to the terminal station. Each of the terminal stations determines a connection destination based on the transmitted policy and transition destination.

Wireless communication system, communication control method, and communication control program

A wireless communication system includes a plurality of base stations to which one or more terminal stations are connectable, and a base station control device controlling each of the plurality of base stations. The base station control device includes an information collection unit collecting connection information regarding the terminal stations connected to the base stations from each of the base stations, a list generation unit generating a white list indicating the terminal stations allowed to be connected to the base stations for each of the base stations based on the connection information, and a transmission unit configured to transmit the white list to each of the base stations. Each of the base stations includes a reception unit receiving the white list, and a setting unit performing setting so as to allow or inhibit connection of each of the terminal stations to the base station based on the received white list.

Wireless communication system, base station control device, communication control method, and communication control program

A radio terminal station device includes a communication unit, an information acquisition unit, a threshold calculation unit, a detection unit, and a system selection unit. The communication unit selects any one of a plurality of different communication systems and performs a radio communication. The information acquisition unit acquires information including a communication state of the radio terminal station device and at least communication states of other radio terminal station devices. The threshold calculation unit calculates a threshold value for detecting deterioration of the communication state of the radio terminal station device. The detection unit detects the deterioration of the communication state of a communication system used by the radio terminal station device. The system selection unit selects an optimal communication system from among the communication systems used by the other radio terminal station devices when the deterioration of the communication state of the communication system of the radio terminal station device is detected. Thus, it is possible to maintain favorable communication quality.

Wireless terminal station device, management station device, wireless communication system and wireless communication method

A wireless performance evaluation method for performing wireless performance evaluation of a wireless network including wireless base stations and wireless terminal stations includes: before performing wireless performance evaluation operation based on wireless performance evaluation information generated from wireless performance evaluation conditions, determining whether an existing wireless performance evaluation result of wireless performance evaluation operation that has been performed is substitutable or not; and if the existing wireless performance evaluation result is substitutable, skipping arithmetic processing corresponding to the wireless performance evaluation information and substituting the existing wireless performance evaluation result.

Wireless performance evaluation method and wireless performance evaluation system

A wireless communication system includes a base station to which a plurality of terminal stations are connectable and a control unit that controls the base station. The base station includes a collection unit that collects terminal station information indicating terminal stations each having issued a connection request to the base station, an information processing unit that causes a storage unit to store connected terminal station information indicating, among the terminal stations indicated by the terminal station information, the terminal station currently being connected to the base station, a network communication unit that receives, from the control station, base station control information for controlling a response to the connection request from the terminal station that is not indicated by the connected terminal station information, and a connection determination unit that determines, based on each of the connected terminal station information and the base station control information, whether or not the connection request from the terminal station that is not indicated by the connected terminal station information is to be refused. The control station transmits, when a predetermined condition is satisfied, to the base station, the base station control information indicating that the connection request from the terminal station that is not indicated by the connected terminal station information is to be refused.

Wireless communication system, base station, and wireless communication method

In a wireless communication system wherein wireless stations transmit on a shared frequency band, each of the wireless station includes means for notifying a control device of environmental information that includes information on interference from outside, and for switching from an operational channel to an evacuation channel notified by the control device when interference from outside is detected on the operational channel, and the control device includes means for calculating an evacuation channel for each wireless station according to a predetermined control procedure based on the environmental information collected from the wireless station, and for notifying the wireless station of the evacuation channel.

Wireless communication system, and wireless communication method

Included are a plurality of base stations to which a plurality of terminal stations are connectable and a control station that controls each of the base stations. The control station includes a network communication unit that receives, from each of the base stations, base station information indicating the base station, wireless environment information indicating a reception signal received by the base station from another of the base stations and a signal intensity thereof, and terminal station information indicating the terminal station connected to the base station and a signal intensity and a calculation unit that calculates, based on the base station information, the wireless environment information, and the terminal station information each received from each of the base stations, connection control information for controlling a connection permission from each of the base stations to each of the terminal stations. Each of the base stations includes a connection control unit that controls, based on the connection control information, the connection permission to each of the terminal stations.

Wireless communication system, control station, base station, and wireless communication method

A radio communication method of connecting a base station with a plurality of terminal stations, the base station including a plurality of radio communication units compatible with a predetermined communication standard, the method including collecting additional-line information including information regarding whether each terminal station is compatible with additional communication standard; collecting request information including a request in the predetermined communication standard of each terminal station; collecting identifier information that identifies each terminal station; calculating, based on the additional-line information, the request information and the identifier information that are collected, a setting policy including a setting for each radio communication unit, and a switching policy of setting a condition for switching the plurality of radio communication units; and setting, for each radio communication unit, the terminal station to be connected based on the setting policy and the switching policy that are calculated.

A communication control method for controlling transmission powers transmitted by a plurality of base stations in a coverage area, the coverage area being covered by the plurality of base stations includes setting a transmission power of each base station to a maximum, calculating, for each base station, a percentage of an individual coverage area with respect to the coverage area when the transmission power of each base station is set to the maximum, the individual coverage area serving as a range in which each base station individually accommodates a terminal station, reducing, when a maximum value of the calculated percentages deviates from an average value by a predetermined value or greater, the transmission power of any of the plurality of base stations with the maximum percentage value, newly calculating, for each base station, a percentage of the individual coverage area with respect to the coverage area, and continuing the control until the maximum value of the calculated percentages deviates from the average value by less than the predetermined value.

Communication control method, control station, and communication control program

A method includes collecting, as environment information, a radio environment represented by a signal received at a plurality of radio communication units from another base station, each of the plurality of radio communication units being switchable between a normal mode in which the radio communication unit performs radio communication as a base station and a subordinate mode in which the radio communication unit performs radio communication as a virtual terminal station, calculating test conduct information for each base station based on base station performance information representing a performance of each base station and the environment information, and conducting an operation test of each base station by, based on the test conduct information, setting any of the radio communication units to the normal mode, switching the radio communication units of the other base station to the subordinate mode, and performing radio communication with each other.

Base station operation test method, wireless communication system, and base station

An object is to provide a terminal device, a communication method, and a communication system which are capable of acquiring accurate optical ID information regardless of the position of the terminal device and the light receiving angle. The terminal device, the communication method, and the communication system according to the present invention each sets a threshold value for the illuminance of a received optical signal by using a moving average method, a weighted moving average method, or an exponential moving average, so that the optical signal can be binarized with a threshold value according to a change in the position of the terminal device, the light receiving angle, or the like. Information from other sensors may be used to set the threshold value.

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Musashino, Japan

Toshiro Nakahira