Abstract: A radio base station device includes a plurality of radio units that perform communication with a radio terminal device, a packet data collection unit that collects packet data communicated by the plurality of radio units on the basis of a packet collection policy, a collected packet data analysis unit that performs analysis on packet data on the basis of a packet analysis policy, and transmits analysis result information to the control station device, and an information processing unit that transmits base station performance information and analysis result information to the control station device, and receives a packet collection policy and a packet analysis policy.

Abstract: 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.

Abstract: A wireless communication method for connecting a base station with each of a plurality of terminal stations set to differ in Guard interval length, with the base station being equipped with a plurality of wireless communications units each configured to be connectable with one or more of the terminal stations, includes: a collection step of collecting information about the Guard interval length set for each of the terminal stations and connection information about the terminal stations; a policy calculation step of calculating a setting policy for setting the Guard interval length permitted for each of the wireless communications units and a switching policy for setting a condition for switching that one of the wireless communications units which is to be connected, for each of the terminal stations, based on each of the collected information about the Guard interval length and connection information about the terminal stations; and a setting step of setting those of the terminal stations which are to be conn

Abstract: A wireless communications method for connecting a base station with each of a plurality of terminal stations, the base station being equipped with a plurality of wireless communications units each configured to be able to selectively enable or disable an RTS/CTS function and a NoACK function and connectable with one or more of the terminal stations, includes: a collection step of collecting information as to whether each of the terminal stations is a hidden terminal and information about transmission characteristics of each of the terminal stations; a policy calculation step of calculating a setting policy for enabling or disabling the RTS/CTS function and the NoACK function for each of the wireless communications units and a switching policy for setting a condition for switching that one of the wireless communications units which is to be connected, for each of the terminal stations, based on the collected information; and a setting step of setting those of the terminal stations which are to be connected, fo

Abstract: A wireless communication system includes a plurality of wireless base stations and a measurement station, each wireless base station including a wireless communication unit, a wireless information collection unit, and a measurement result collection unit, the measurement station being configured to control the plurality of wireless base stations, wherein the measurement station generates a measurement condition based on wireless environment information collected by the wireless information collection unit of each wireless base station and notifies each wireless base station of a measurement control signal corresponding to the measurement condition, each wireless base station sends traffic addressed to a subordinate wireless terminal station or broadcast traffic at the same time in accordance with the notified measurement control signal, a measurement result collection unit of a wireless base station that is a measurement target measures wireless communication performance and notifies the measurement station o

Abstract: The invention of the present application provides a transmission parameter control method in a radio communication system that performs, between a radio base station and a plurality of radio terminal stations, communication of a first method in which reception confirmation is enabled and communication of a second method in which reception confirmation is not possible. The radio base station selects transmission parameters including a transmission rate in the communication of the second method with the radio terminal stations, based on radio communication information in the communication of the first method with the radio terminal stations.

Abstract: [Problem] In a terminal station and a base station, in which a plurality of wireless communication units supporting different communication performances are mounted, it is possible to select and switch wireless communication unit which responds to a congested condition of wireless communication and a wireless communication quality, and further improves a wireless resource usage efficiency.

Abstract: A wireless communications method for connecting a base station with each of a plurality of terminal stations set to differ in basic rate, the base station being equipped with a plurality of wireless communications units configured to be connectable with one or more of the terminal stations, includes: a collection step of collecting information about a transmission rate set for each of the terminal stations; a policy calculation step of calculating a setting policy for setting a basic rate permitted for each of the wireless communications units and a switching policy for setting a condition for switching that one of the wireless communications units which is to be connected, for each of the terminal stations, based on each item of the collected information about transmission rates; and a setting step of setting those of the terminal stations which are to be connected, for each of the wireless communications units based on the calculated setting policy and switching policy.

Abstract: A wireless communication device that detects a vacant channel by carrier sensing from among a plurality of channels and performs communication using the vacant channel includes a carrier sensing unit configured to divide channels to be carrier sensed between a wireless station and a surrounding wireless station, acquire a result of carrier sensing from the surrounding wireless station, and share results of carrier sensing from the wireless station and the surrounding wireless station to detect the vacant channel.

Abstract: Provided is a position estimation method in which a measurement signal and a response signal are transmitted and received between multiple n wireless stations respectively provided with known antennas installed at known positions different from each other and a wireless terminal station provided with a terminal antenna, RTT, which is a round-trip delay time of the transmission and reception, and RSSI, which is a strength of received radio waves of the signals, are measured, and a position of the wireless terminal station is estimated. The method includes: obtaining, as the position of the wireless terminal station, a solution of simultaneous equations of an RTT evaluation function fti for evaluating the estimate value of the position of the wireless terminal station that is estimated based on the RTT measured between the wireless terminal station and the known antenna i (i=1, 2, . . .

Abstract: The each AP includes a control unit that detects, as the wireless environment information, a signal detection level for one or more neighboring APs positioned in the neighborhood of the AP and notifies the detected signal detection level to the central coordinator, and controls the ATT value by the setting in the central coordinator; and the central coordinator includes a parameter calculation unit that calculates the ATT value for each the APs, based on the signal detection level for each the neighboring wireless access point notified from the plurality of APs and based on an RSSI threshold at which each the APs is able to secure a prescribed service area.

Abstract: Provided is an antenna placement method in a system for detecting an object in a detection area between at least one set of a transmission station and a reception station by a wireless signal.

Abstract: An object is to enable high-accuracy position estimation of a wireless terminal station by efficiently performing connection between a wireless base station and the wireless terminal station using multiple distributed antennas.

Abstract: A characteristic variable antenna configured to be able to select or switch antenna characteristics in accordance with a predetermined periodic variable timing, an RF unit configured to perform a reception process on a signal received by the characteristic variable antenna, an ADC unit configured to sample the analog signal input from the RF unit at a sampling period corresponding to the variable timing of the antenna characteristics of the characteristic variable antenna, a signal dividing unit configured to divide the digital signal input from the ADC unit into different digital signals in accordance with the antenna characteristics and output the divided different digital signals, a MIMO-OFDM demodulation unit configured to receive inputs of the different digital signals divided by the signal dividing unit and perform a demodulation process of predetermined MIMO-OFDM, and a control unit configured to periodically select or switch the antenna characteristics of the characteristic variable antenna in accorda

Abstract: Provided is a wireless base station which uses distributed antennas and selects a combination of a plurality of wireless terminals and the distributed antennas of a wireless base station that performs multi-user transmission with respect to the plurality of wireless terminals in a multi-BSS wireless environment. The wireless base station includes: a scheduling unit that measures reception power (RSSI) from each wireless terminal at each of the distributed antennas and selects a combination of a plurality of wireless terminals and a plurality of antennas having approximately the same RSSIs in descending order for respective wireless terminals; and a transmission power control unit that sets minimum transmission power corresponding to the RSSI of the antenna when multi-user transmission is performed between the plurality of wireless terminals and the plurality of antennas combined by the scheduling unit.

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

Abstract: An object is to enable high-accuracy position estimation of a wireless terminal station by efficiently performing connection between a wireless base station and the wireless terminal station using multiple distributed antennas.

Abstract: Interference in preamble signals and pilot signals in cooperative transmission using interference suppressing technology is avoided. A wireless apparatus for transmitting a wireless signal on which directivity control has been performed to stations in a wireless system including at least one wireless apparatus is provided with a known signal generating unit which generates a known signal to be added to the wireless signal, a weighting processing unit which performs weighting on the known signal generated by the known signal generating unit, and a wireless processing unit which transmits the known signal on which the weighting has been performed by the weighting processing unit.

Abstract: Included are n antenna sets; n antenna switch units; n signal change units each changing a combination of one or more of a phase, a timing, a frequency, and a power of each signal transmitted/received in n antennas being selected from the antenna sets; a notification unit outputting a notification signal, in which control information on the antenna switch units and the signal change units according to a target terminal being a destination/source of the signals transmitted/received in the n antennas, are arranged according to a switch time of each of the antenna switch units and a change time of each of the signal change units; and a control unit sequentially starting control of switching by each of the antenna switch units and control of changing by each of the signal change units in order in which the control information on the each unit in the notification signal is notified.

Abstract: [Problem] A base station includes a plurality of radio communication units individually supporting a plurality of communication capabilities, and controls a terminal station to be connected with the base station to select a radio communication unit according to a communication scheme of the terminal station. [Solution] Provided is a radio communication method of a radio communication system. The radio communication system includes a plurality of base stations mounted with a plurality of radio communication units for which different communication schemes are settable, a terminal station configured to perform radio communication in a certain communication scheme, and a centralized control station configured to control the plurality of base stations.