Patent application number | Description | Published |
20100279725 | RADIO APPARATUS, RADIO COMMUNICATION SYSTEM, AND METHOD FOR DETECTING RADIO WAVE - 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. | 11-04-2010 |
20110085612 | COGNITIVE RADIO SYSTEM, COGNITIVE RADIO APPARATUS, AND RADIO SIGNAL DETECTION METHOD - 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. | 04-14-2011 |
20110199965 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, AND RADIO APPARATUS - 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. | 08-18-2011 |
20110207468 | BASE STATION, RADIO COMMUNICATIONS SYSTEM, BASE STATION CONTROL METHOD, RADIO COMMUNICATIONS METHOD AND BASE STATION CONTROL PROGRAM - [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. | 08-25-2011 |
20110228683 | RADIO COMMUNICATION METHOD, RADIO COMMUNICATION DEVICE, RADIO COMMUNICATION PROGRAM, AND RADIO COMMUNICATION SYSTEM - 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. | 09-22-2011 |
20120322390 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, INTERFERENCE CAUSING CONTROL METHOD, STORAGE MEDIUM AND CONTROL APPARATUS - [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. | 12-20-2012 |
20120329403 | WIRELESS STATION, DETERMINATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, DETERMINATION METHOD, AND STORAGE MEDIUM - [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. | 12-27-2012 |
20130116000 | BASE STATION, RADIO COMMUNICATIONS SYSTEM, BASE STATION CONTROL METHOD, RADIO COMMUNICATIONS METHOD AND BASE STATION CONTROL PROGRAM - [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. | 05-09-2013 |
20140112179 | PATH LOSS CALCULATION METHOD, PATH LOSS CALCULATION DEVICE, PATH LOSS CALCULATION PROGRAM, WIRELESS COMMUNICATION SYSTEM, AND SPECTRUM MANAGER - 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. A permissible transmission power setting unit calculates permissible transmission power of the secondary transmitting station using the path loss estimation value which has been actually measured and corrected. | 04-24-2014 |
20140378177 | RECEIVED POWER ESTIMATION DEVICE, RECEIVED POWER ESTIMATE METHOD, PROGRAM, SENSOR STATION, AND RADIO SYSTEM - 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. | 12-25-2014 |
20150050939 | RADIO TERMINAL, RADIO STATION, RADIO COMMUNICATION SYSTEM, AND METHODS IMPLEMENTED THEREIN - In one embodiment, a radio terminal ( | 02-19-2015 |