Patent application number | Description | Published |
20100111207 | TRANSMITTER AND METHOD FOR CONFIGURING TRANSMISSION FRAME - A transmitter which transmits information in transmission frame to a receiver, the transmission frame including multiple transmission symbols and guard intervals obtained by replicating a fixed time period of a transmission symbol, generates a transmission frame by making phases of one transmission symbol out of two transmission symbols and a guard interval thereof continuous with phases of the other transmission symbol and a guard interval thereof, when the two continuous transmission symbols are the same. | 05-06-2010 |
20110009141 | RADIO STATION, TRANSMITTING STATION, AND FREQUENCY BAND SHARING METHOD - The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system. | 01-13-2011 |
20110019634 | RADIO COMMUNICATION APPARATUS AND METHOD - A disclosed radio communication apparatus includes an intermediate band detecting unit detecting an intermediate band which is a band between a first frequency band and a second frequency band which are allocated to a same mobile communication system or different mobile communication systems, a use status detecting unit detecting an uplink/downlink multiplexing method used in each of the first frequency band and the second frequency band, and a determination unit determining, based on the intermediate band and the uplink/downlink multiplexing method, the uplink/downlink multiplexing method usable in the intermediate band and a guard band in which use of frequencies are prevented, the guard band being included in the intermediate band. | 01-27-2011 |
20110044214 | MOBILE COMMUNICATION SYSTEM - In a mobile communication system including a base station and a user terminal which communicate with each other according to FDD (frequency division duplex), an uplink frequency band and a downlink frequency band which are adjacent to each other are divided into plural time slots. The user terminal includes an interference detecting unit configured to detect interference in the downlink frequency band; and a time slot information generating unit configured to generate information about an available time slot in the downlink frequency band based on the detected interference. The base station includes a time slot allocating unit configured to allocate a time slot to be used in the downlink frequency band based on the information about the time slot received from the user terminal. | 02-24-2011 |
20110059701 | RADIO COMMUNICATION APPARATUS AND RADIO COMMUNICATION METHOD IN COMMUNICATION SYSTEM - A radio communication apparatus includes: a receiving unit configured to receive a cognitive signal including system information of each of a plurality of systems; a metric unit configured to prepare metric information indicating relationship degree between the radio communication apparatus and a communication system to which the radio communication apparatus does not belong; a condition determination unit configured to determine whether a restriction should be imposed on transmission by the radio communication apparatus based on the system information and the metric information; and a transmission unit configured to transmit a signal using predetermined radio resources when transmission by the radio communication apparatus is not prohibited. | 03-10-2011 |
20110134855 | TRANSMITTING/RECEIVING DEVICE, WIRELESS TERMINAL DEVICE AND WIRELESS COMMUNICATION DEVICE - The present invention provide a transmitting/receiving device that includes a sensing period information setting part for, in an interfering system that shares at least a part of a frequency band with an interfered system, setting sensing period information that shows a sensing period for a signal using a shared frequency band; and a transmission prohibition period information notifying part for notifying a terminal in the interfering system of transmission prohibition period information for prohibiting transmission processing in the interfering system until an end of the sensing period, a maximum transmission period for one transmission by the terminal in the interfering system prior to a start point of the sensing period. | 06-09-2011 |
20110136525 | RADIO BASE STATION, RELAY APPARATUS AND RADIO COMMUNICATION METHOD - A radio base station determines a communication mode for each radio communication terminal from among a direct mode for communicating without via a relay apparatus, a relay mode for communicating via the relay apparatus by using a directional beam transmitted between the radio base station and the relay apparatus, and a combined mode for communicating by combining the direct mode and the relay mode based on the reception power information acquired from each radio communication terminal, and communicates with the each radio communication terminal by using the communication mode determined for the each radio communication terminal. | 06-09-2011 |
20110182377 | RADIO COMMUNICATION SYSTEM - The second radio communication system selects one or more of the sub-carriers S | 07-28-2011 |
20110244786 | REFLECTOR APPARATUS, RADIO BASE STATION AND RADIO COMMUNICATION METHOD - A reflector apparatus includes a reflector configured to reflect a directional beam transmitted from an array antenna of a radio base station to the reflector apparatus, a signal receiving unit configured to receive a training signal transmitted from the radio base station, a weight generating unit configured to generate an optimum weight of the directional beam transmitted from the radio base station based on the training signal reception result by the signal receiving unit and a control signal transmitting unit configured to transmit weight information indicating the optimum weight generated by the weight generating unit to the radio base station. | 10-06-2011 |
Patent application number | Description | Published |
20080207239 | TRANSMITTER APPARATUS, MOBILE COMMUNICATION SYSTEM, BASE STATION AND COMMUNICATION ENABLE SIGNAL TRANSMITTER APPARATUS - The present invention has an object of providing a transmitter apparatus, a mobile communication system, a base station and a communication enable signal transmitter unit, which can prioritize communications of a mobile station in a priority communication system over communications of a mobile station in a non-priority communication system, in a network where the priority communication system and the non-priority communication system coexist in the same communication area. | 08-28-2008 |
20090088083 | BASE STATION, RECEIVING DEVICE, MOBILE TERMINAL, AND FREQUENCY SHARING METHOD - A disclosed base station is used in a first wireless communication system using a first frequency band that is the same as or adjacent to a second frequency band used by a second wireless communication system, and includes a propagation loss estimation unit configured to estimate propagation loss of a signal in the first frequency band when the signal arrives at a receiving device of the second wireless communication system; a frequency difference calculation unit configured to calculate a frequency difference between the first frequency band and the second frequency band; a maximum transmission power determining unit configured to determine maximum transmission power based on the estimated propagation loss and the calculated frequency difference; and a transmission control unit configured to transmit a signal with transmission power less than or equal to the maximum transmission power determined by the maximum transmission power determining unit. | 04-02-2009 |
20090098904 | COMBINED COMMUNICATIONS SYSTEM, PROHIBITING-SIGNAL TRANSMITTING APPARATUS, WIRELESS BASE STATION, AND METHOD - A prohibiting-signal transmitting apparatus for use in a combined system such that there is at least a partial overlap between bands allocated to an old communications system and bands allocated to a new communications system is disclosed. The apparatus includes a unit which monitors for a band-in-use, over which communications are actually being conducted, out of the bands allocated to the old communications system; a unit which generates a prohibiting signal indicating that the band-in-use should not be used in the new communications system; and a unit which transmits the prohibiting signal to a communications apparatus of the new communications system. | 04-16-2009 |
20100219884 | TRANSMITTER, RECEIVER, POWER AMPLIFICATION METHOD, AND SIGNAL DEMODULATION METHOD - There is provided a transmitter including a nonlinear input-output conversion characteristic control unit configured to determine a nonlinear input-output conversion characteristic for converting a signal depending on a usage status of a frequency band; an amplitude control unit configured to convert an amplitude of the signal based on the determined nonlinear input-output conversion characteristic; and a transmission power amplification unit configured to amplify power of the signal with the converted amplitude. There is also provided a transmitter including a nonlinear input-output conversion characteristic control unit configured to determine a nonlinear input-output conversion characteristic for converting a signal depending on a usage status of a frequency band; plural transmission power amplification units having different nonlinear input-output conversion characteristics; and a selecting unit configured to select one of the plural transmission power amplification units based on the determined nonlinear input-output conversion characteristic. | 09-02-2010 |
20110165851 | SIGNAL DETECTION APPARATUS AND SIGNAL DETECTION METHOD FOR USE IN RADIO STATION OF RADIO COMMUNICATION SYSTEM - A signal detection apparatus | 07-07-2011 |
20110235740 | SIGNAL GENERATION DEVICE AND SIGNAL GENERATION METHOD - Disclosed is a signal generation device that employs a transmission method using inverse Fourier transform. The signal generation device includes: a modulation unit which modulates transmission data to obtain modulation data; a serial-parallel conversion unit which converts the modulation data input in series to parallel data of a predetermined size smaller than the size of inverse Fourier transform; a duplication unit which selects and duplicates all or a portion of the parallel data to obtain duplication data; a first time-axis shift unit which shifts the duplication data along the time axis to obtain time-axis shift data; and an inverse Fourier transform unit which carries out inverse Fourier transform on the parallel data obtained by the serial-parallel conversion unit and the time-axis shift data obtained by the first time-axis shift unit. | 09-29-2011 |
20120094618 | SIGNAL DETECTION APPARATUS AND SIGNAL DETECTION METHOD - A signal detection apparatus includes: a unit configured to select a particular detection target signal from among plural candidates of detection target signals; a unit configured to calculate a cyclic autocorrelation value at a center coordinate point specified by at least a cyclic parameter and a shift parameter of the particular detection target signal; a unit configured to calculate a cyclic autocorrelation value of each of (L−1) coordinate points belonging to a common area that is used commonly for different detection target signals; a unit configured to calculate a test statistic of the particular detection target signal; and a unit configured to determine presence or absence of the particular detection target signal according to a comparison result between the test statistic and a threshold, wherein the test statistic is calculated by using the cyclic autocorrelation value in each of the (L−1) coordinate points belonging to the common area. | 04-19-2012 |
20120213102 | WIRELESS STATION, INTERFERENCE AVOIDANCE METHOD, AND SYSTEM FOR INTERFERENCE AVOIDANCE - A wireless station in a second communication system, with at least a portion of a first frequency band used in a first communication system and a portion of a second frequency band used in the second communication system being shared or neighboring, the wireless station including a waveform characteristic quantity extracting unit that extracts a waveform characteristic quantity which shows a statistical characteristic of a signal received from the first communication system; a communication parameter determining unit that determines communication parameters to be used for the wireless station in the second communication system depending on a determination result of whether the extracted waveform characteristic quantity is of a predetermined waveform characteristic quantity for reducing an interference; and a transmission and reception unit that transmits and receives a wireless communication signal in the second communication system in accordance with the determined communication parameters. | 08-23-2012 |
Patent application number | Description | Published |
20120178467 | RADIO COMMUNICATION METHOD AND RADIO BASE STATION - When a frequency band is shared between a large cell system having a large cell base station and a small cell system having a small cell base station, the large cell base station dynamically controls dedicated resources for the large cell base station and shared resources for both the large cell base station and the small cell base station based on predetermined information, broadcasts allocation information of dedicated resources for the large cell base station and shared resources for both the large cell base station and the small cell base station, to the small cell base station belonging to the own cell, and the small cell base station belongs to at least one large cell base station and determines resource assignment in the own cell based on the resource allocation information broadcast from the large cell base station. | 07-12-2012 |
20120214525 | RADIO BASE STATION, USER TERMINAL AND FREQUENCY BAND SHARING METHOD - A CRS base station ( | 08-23-2012 |
20130059616 | RADIO STATION, TRANSMITTING STATION, AND FREQUENCY BAND SHARING METHOD - The invention has a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system, a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band, and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system. | 03-07-2013 |
20140221030 | USER TERMINAL - A CRS base station ( | 08-07-2014 |