Abstract: [Problem] According to conventional techniques, a modulation class is determined on the basis of past communication environment information stored at a base station, and the modulation class cannot be determined with consideration of a communication environment in which a signal is retransmitted. Thus, with the conventional techniques, a modulation and coding scheme cannot be determined with consideration of the communication environment in which the signal is retransmitted. [Solution] An embodiment of this communication system has a control unit that determines a first modulation and coding scheme to be applied to a signal on the basis of information about predicted first communication quality when a signal is transmitted at a first timing and information about predicted second communication quality when the signal is retransmitted at a second timing.

Abstract: [Problem] According to conventional techniques, a modulation class is determined on the basis of past communication environment information stored at a base station, and the modulation class cannot be determined with consideration of a communication environment in which a signal is retransmitted. Thus, with the conventional techniques, a modulation and coding scheme cannot be determined with consideration of the communication environment in which the signal is retransmitted. [Solution] An embodiment of this communication system has a control unit that determines a first modulation and coding scheme to be applied to a signal on the basis of information about predicted first communication quality when a signal is transmitted at a first timing and information about predicted second communication quality when the signal is retransmitted at a second timing.

Abstract: A transmission angle control device in a wireless communication system based on a TDD scheme includes: an interference signal detection unit that detects a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station and that outputs the interference level as an interference information signal; and a transmission angle determining unit that adjusts a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal.

Abstract: Transmission power of each base station of a secondary system is determined in such away that a transmission capacity of the secondary system is increased as much as possible while interference with a first radio system (primary system) is suppressed by properly controlling the transmission power of a plurality of second transmission stations. A second transmission station transmission power determination means is provided, which determines the transmission power used in each of the second transmission stations based on a first condition that satisfies an allowable value in relation to a system interference amount as an interference amount given to a first reception station as a predetermined reception station of the first radio system by all of the plurality of second transmission stations as transmission stations of a second radio system using a frequency band allocated to the first radio system or a frequency band allowed to be preferentially used.

Abstract: [Problem] Provided are a base station, a terminal station, a radio system, a radio control method and a storage medium capable of estimating with high accuracy a utilization status of a frequency band which is assigned to or of which a preferential use is permitted to another radio system. [Solution] A base station of a radio system, which estimates a utilization status of a frequency band which is assigned to or of which a preferential use is permitted to another radio system, wherein the base station comprises an estimation means which estimates a utilization status of said frequency band, on the basis of a received signal power ratio between a received signal power value of the other radio systems and a received signal power value of the own radio system, which is obtained at least one sensing apparatus.

Abstract: A transmission angle control device in a wireless communication system based on a TDD scheme includes: an interference signal detection unit that detects a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station and that outputs the interference level as an interference information signal; and a transmission angle determining unit that adjusts a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal.

Abstract: An uplink timing control device and method which make no excessive resource request for timing update when performing an uplink timing control even to a mobile station which performs no uplink signal transmission are provided. A system is characterized by comprising a mobile station ranking section for performing the prioritization of each mobile station from high necessity for the timing update in consideration of the occurrence of an extra-CP timing shift and the DRX remaining activation time of a mobile station which DRX-operates besides the mobile station received signal information at the time of the TA transmission in the past and the elapsed time form the TA transmission in the past. The system performs the timing update by allowing a mobile station with high priority determined by the mobile station ranking section to transmit an uplink timing detection signal and to notify the TA.

Abstract: Transmission power of each base station of a secondary system is determined in such away that a transmission capacity of the secondary system is increased as much as possible while interference with a first radio system (primary system) is suppressed by properly controlling the transmission power of a plurality of second transmission stations. A second transmission station transmission power determination means is provided, which determines the transmission power used in each of the second transmission stations based on a first condition that satisfies an allowable value in relation to a system interference amount as an interference amount given to a first reception station as a predetermined reception station of the first radio system by all of the plurality of second transmission stations as transmission stations of a second radio system using a frequency band allocated to the first radio system or a frequency band allowed to be preferentially used.

Abstract: [Problem] Provided are a base station, a terminal station, a radio system, a radio control method and a storage medium capable of estimating with high accuracy a utilization status of a frequency band which is assigned to or of which a preferential use is permitted to another radio system. [Solution] A base station of a radio system, which estimates a utilization status of a frequency band which is assigned to or of which a preferential use is permitted to another radio system, wherein the base station comprises an estimation means which estimates a utilization status of said frequency band, on the basis of a received signal power ratio between a received signal power value of the other radio systems and a received signal power value of the own radio system, which is obtained at least one sensing apparatus.

Abstract: An uplink timing control device and method which make no excessive resource request for timing update when performing an uplink timing control even to a mobile station which performs no uplink signal transmission are provided. A system is characterized by comprising a mobile station ranking section for performing the prioritization of each mobile station from high necessity for the timing update in consideration of the occurrence of an extra-CP timing shift and the DRX remaining activation time of a mobile station which DRX-operates besides the mobile station received signal information at the time of the TA transmission in the past and the elapsed time form the TA transmission in the past. The system performs the timing update by allowing a mobile station with high priority determined by the mobile station ranking section to transmit an uplink timing detection signal and to notify the TA.