Abstract: [Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in light traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station receives a transmission signal from a mobile station to other base station, and starts transmission of a control signal with predetermined power depending on a reception condition of the transmission signal.

Abstract: [Problem] To provide a wireless station, a determination apparatus, a wireless communication system, a determination method, and a storage medium which can carry out appropriate interference causing control in a secondary system adaptively to an actual environment with no change in a configuration of a primary system. [Means to solve the problem] A wireless station includes a determination means to determine at least one monitoring station measuring a wireless signal, which is transmitted by the wireless station and which causes interference to another system, out of plural wireless stations of a wireless communication system to which the wireless station belongs.

Abstract: A frequency management method and device as well as a wireless system are provided by which acceptable transmit power is efficiently determined for transmitting stations in a system on the interfering side, neither with concentration of processing load on some part nor with redundant processing. When a frequency management apparatus (50—1) receives a notice regarding a change in the state of frequency use from a radio station (20—1) under its own management (S101), the frequency management apparatus (50—1) sets acceptable transmit power for radio stations (20—1, 20—2) under its own management and radio stations (20—3, 20—4) managed by another frequency management apparatus (50—2), based on the notified change in the state of frequency (S103, S104).

Abstract: [Problem] To provide a wireless communication apparatus, a wireless communication system, an interference causing control method, a storage medium, and a control apparatus which can carry out appropriate interference causing control to a secondary system adaptively to an actual environment with no change in a configuration of a primary system. [Means to solve the problem] A wireless communication apparatus, which belongs to a wireless communication system, measures a wireless signal which causes interference to another system and which another wireless communication apparatus belonging to the wireless communication system transmits.

Abstract: To provide a base station in which an electric power consumed in the base station can be suppressed and an electromagnetic wave interference between the base stations can be avoided, a method for controlling a base station, a control program, and a mobile station. The base station includes storage means, traffic history generation means for measuring a traffic of the base station for each unit time and storing it in the storage means as a traffic history, and control means for controlling transmission of a control signal based on the traffic history.

Abstract: In one embodiment, a radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100). This embodiment therefore contributes to simplification of a measurement function which should be supported by the radio terminal when the radio communication system uses a shared frequency (e.g., TVWS) shared by the plurality of radio systems.

Abstract: [Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station starts transmission of a control signal with predetermined power when communication between other base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: The present invention is a device which, when a second wireless system shares the use of a frequency which is allocated to a first wireless system, estimates receiving power when a second wireless signal which is transmitted from a transmission station of the second wireless system is received at a receiving station of the first wireless system. The receiving power estimation device comprises a correction means for correcting a receiving power estimate value of the second wireless signal at the first wireless system receiving station which is computed using an estimate value of path loss from the second wireless system transmission station to the first wireless system receiving station, said correction using a receiving power measurement value of the second wireless signal which is measured in a transmission station periphery sensor station which is a sensor station which is located in the periphery of the second wireless system transmission station.

Abstract: Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between other base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: [Problems] Because it is not possible to reduce sufficiently the number of base stations that starts uselessly in spite of being in low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. [Measures] A base station starts transmission of a control signal with predetermined power when communication between other base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: A radio system includes: a memory which stores a system parameter and a pseudo parameter, the system parameter being used for generation of a feature value specific to a search target radio system, the pseudo parameter being similar to the system parameter; a feature value generator which generates one or a plurality of the feature values based on a signal in a received frequency band by using the system parameter; a non-feature value generator which generates one or a plurality of non-feature values based on the signal in the received frequency band by using the pseudo parameter; and a determination section which determines whether or not a signal of the search target radio system exists by using the one or the plurality of the feature values and the one or the plurality of non-feature values.

Abstract: [Problem] The number of the base stations that are activated uselessly cannot be sufficiently reduced even in a light traffic state. As a result, interference between adjacent cells and power consumption cannot be sufficiently reduced. [Means For Solving the Problems] The base station controls transmission of a control signal according to communication quality in a wireless link between a mobile station and another base station.

Abstract: A wireless station of the present invention includes: a synchronization unit configured to synchronize with a transmission suspension period of a transmitting station of a wireless system, a measurement unit configured to measure a reception level of a wireless signal of said transmitting station in a transmission period and a reception level in the transmission suspension period, and an interference estimation unit configured to estimate an amount of interference to another wireless system according to the measured reception level in the transmission suspension period and reception level in the transmission period.

Abstract: A spectrum manager manages a secondary system that shares a frequency with a primary system. A communication unit receives a measurement value of reception power of a signal of the secondary system which is measured by a monitoring station, and holds the measurement value in a measurement result storage unit. A path loss estimating unit estimates a path loss at a first frequency, and a path loss correcting unit performs actual measurement correction on a path loss estimation value using one of a reception power measurement value of a radio signal of a secondary transmitting station measured at a second frequency different from the first frequency and a reception power measurement value of the radio signal of the secondary transmitting station measured in a period of time which is not used by the primary system.

Abstract: In cooperative sensing in which a plurality of cognitive radio apparatus collaboratively exchange sensing information on a status of frequency band usage as a secondary system, the sensing information is efficiently exchanged in the secondary system without influencing communication of the primary system. In a radio communication system according to this invention, a first radio communication device includes means for observing a surrounding radio communication environment, means for converting information obtained by the observation into a parameter used for radio communication, and means for performing transmission by using the parameter, and a second radio communication device includes means for receiving a signal transmitted from the first radio communication device and means for extracting, from the received signal, information on the surrounding radio communication environment that is observed on a transmission side.

Abstract: A radio communications system includes a first base station, a second base station, and at least one mobile station which can communicate with the first base station and the second base station. The second base station starts transmission of a control signal with predetermined power when communication between the first base station and the mobile station is started, and a predetermined condition is satisfied.

Abstract: Provided is a radio communication system including a plurality of cognitive radio apparatuses each including at least: a transmission/reception element; and a detection element for detecting a radio wave transmitted from a radio apparatus of another radio communication system, in which the radio communication system further includes a control section for determining a frequency band on which each cognitive radio apparatus of a radio apparatus group including the plurality of cognitive radio apparatuses is to detect the radio wave.

Abstract: After checking a status of frequency band usage of a primary system by preliminary sensing, a master node transmits to slave nodes a sensing request containing a target frequency band for cooperative sensing. The slave nodes perform spectrum sensing according to specified parameters and send, as responses, results thereof to the master node. The master node collectively receives these results, comprehensively determines the sensing results of the slave nodes, and makes a final determination on whether or not the target frequency band is available.

Abstract: [Problem] To provide a wireless station, a determination apparatus, a wireless communication system, a determination method, and a storage medium which can carry out appropriate interference causing control in a secondary system adaptively to an actual environment with no change in a configuration of a primary system. [Means to solve the problem] A wireless station includes a determination means to determine at least one monitoring station measuring a wireless signal, which is transmitted by the wireless station and which causes interference to another system, out of plural wireless stations of a wireless communication system to which the wireless station belongs.

Abstract: [Problem] To provide a wireless communication apparatus, a wireless communication system, an interference causing control method, a storage medium, and a control apparatus which can carry out appropriate interference causing control to a secondary system adaptively to an actual environment with no change in a configuration of a primary system. [Means to solve the problem] A wireless communication apparatus, which belongs to a wireless communication system, measures a wireless signal which causes interference to another system and which another wireless communication apparatus belonging to the wireless communication system transmits.