Abstract: A communications method includes transmitting by a radio apparatus, where the radio apparatus transmits to a control apparatus, first information indicating a wireless scheme that the radio apparatus can use in any one among wireless communication and wireless broadcasting; extracting and transmitting by the control apparatus, where the control apparatus extracts from frequency information correlating wireless schemes and available frequencies, a frequency that corresponds to the wireless scheme indicated by the first information transmitted by the radio apparatus and transmits to the radio apparatus, second information indicating the extracted frequency; and performing by the radio apparatus, any one among the wireless communication and the wireless broadcasting, using the frequency indicated by the second information transmitted by the control apparatus.

Abstract: A use management apparatus includes a calculation unit that calculates an input level to an amplifier that amplifies a first signal transmitted from a transmitter station of a primary system, the input level being calculated by adding second field intensity of a second signal to first field intensity of the first signal, the second signal being transmitted from a transmitter station of a secondary system with use of a white space of the primary system, and a use propriety determination unit that authorizes the secondary system to use the white space when the input level is less than a saturation input level of the amplifier.

Abstract: A user terminal in a radio communication system, in which each of user terminals performs multiplexing of a data signal and a pilot signal and transmits the multiplexed signal to a base station using different data transmission band frequencies that are assigned by the base station, the user terminal includes a receiving unit that receives uplink resource information from a base station; and a pilot generation unit that generates a Zadoff-Chu sequence, to which a cyclic shift is applied, as a pilot signal based on the uplink resource information; and a transmitting unit that transmits the pilot signal generated by the pilot generation unit to the base station; wherein the pilot generation unit includes a subcarrier mapping unit that performs subcarrier mapping by copying a part of the Zadoff-Chu sequence and adding the copy to the Zadoff-Chu sequence in a frequency domain.

Abstract: The frequency notifying device includes: a processor configured to store usable frequencies containing a restricted frequency being restricted in use thereof by radio equipment in a predetermined communication area and a frequency not being restricted in use thereof by the radio equipment in the communication area; and notify the radio equipment, in the communication area, of a signal for requesting the radio equipment to check whether the restricted frequency is usable or not before performing a communication using the restricted frequency when notifying the radio equipment of the usable frequency.

Abstract: A wireless communication system includes a base station including a determining section that determines control information indicating signal processing for each of wireless resources used for wireless communication with terminal equipment units, and remote access sections each including a first signal processing section that performs first signal processing on a first downlink signal received from the base station so as to generate a second downlink signal to be transmitted to the units via the wireless communication, and a second signal processing section that performs second signal processing on a second uplink signal received from the units via the wireless communication so as to generate a first uplink signal to be transmitted to the base station, and at least one of the first signal processing and the second signal processing being performed for each of the wireless resources based on the control information.

Abstract: A base station is connected to a relay station that relays wireless signals from a mobile station. The base station includes a resource block assigning unit configured to generate first resource block assignment information of a first wireless section based on a first propagation quality of the first wireless section between the base station and the relay station; a ratio determining unit configured to calculate a ratio of a number of first resource blocks assigned to the first wireless section and a number of second resource blocks to be assigned to a second wireless section for transmitting the number of first resource blocks in the second wireless section between the relay station and the mobile station; and a transmitting unit configured to transmit the first resource block assignment information and the ratio to the relay station.

Abstract: An information processing apparatus that manages information of a first frequency band allocated to a first communication system includes: a reception unit that receives, from a second communication system different from the first communication system, capability information indicating sensing capability of sensing a wireless signal by a communication apparatus of the second communication system; and a transmission unit that transmits, to the communication apparatus of the second communication system, information related to a sensing method for sensing a wireless signal transmitted from a communication apparatus of the first communication system in a second frequency band included in the first frequency band, based on the information of the first frequency band and the capability information of the communication apparatus of the second communication system.

Abstract: A communications apparatus includes a processor configured to identify positions where wireless communication with a mobile communications apparatus is possible, the positions being included in a coverage area of the communications apparatus; and obtain from a database that is inaccessible to the mobile communications apparatus, frequency information that indicates frequencies that can be used for the wireless communication at the identified positions; and an announcing unit configured to announce in the coverage area and by a radio signal, correspondence information that is based on the frequency information obtained by the obtaining unit and that correlates the positions and the frequencies that can be used.

Abstract: A mobile station that establishes an uplink wireless connection by transmitting a random access signal through a random access channel after receiving a synchronization channel transmitted from a radio base station in a handover destination, and includes a setting unit for setting a timing of transmitting the random access signal to be later than the timing of receiving the synchronization channel by a prescribed period.

Abstract: A user terminal in a radio communication system, in which each of user terminals performs multiplexing of a data signal and a pilot signal and transmits the multiplexed signal to a base station using different data transmission band frequencies that are assigned by the base station, the user terminal includes a receiving unit that receives uplink resource information from a base station. A pilot generation unit that generates a pilot signal based on the uplink resource information and a transmitting unit that transmits the pilot signal generated by the pilot generation unit to the base station where the pilot generation unit includes a sequence generation unit that generates a Zadoff-Chu sequence as a pilot signal based on the uplink resource information and a subcarrier mapping unit that performs mapping of a sequence generated by cyclically copying the Zadoff-Chu sequence.

Abstract: A wireless communication method for transmitting data signals of first and second users using first and second subcarrier groups, respectively, and transmitting pilot signals of the first and second users by multiplexing the pilot signals to the data signals, including allocating the pilot signals of the first and second users to different frequencies, where each of the pilot signals is generated based on Zadoff-Chu sequence; and mapping subcarrier components of the pilot signals so that one or more subcarrier components of higher frequencies and one or more subcarrier components of lower frequencies in the transmission band become identical, in regard to the pilot signals of each of the first and second users.

Abstract: A radio communication method in a radio communication system in which data signals for a first and second user are respectively transmitted using first and second subcarrier groups, and pilot signals for the first and second users are multiplexed using time-division multiplexing with the data signals for those users, including arranging a pilot signal of the first user at frequencies different from frequencies of a pilot signal of the second user and mapping subcarrier components of the pilot signals so that one of subcarrier components of higher frequencies corresponds to one of subcarrier components of lower frequencies, wherein the pilot signals are generated using a Zadoff-Chu sequence.

Abstract: A mobile station for performing radio communication with a radio base station, the mobile station includes an information generation section which generates information indicative of a result of error detection on a downlink signal received; and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel; whereby the information generation section and the sending section operate when the mobile station receives downlink scheduling information and uplink allocation grant in a same subframe.

Abstract: An generation section which generates information indicative of a result of error detection on a downlink signal received, and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel, whereby the generation section and the sending section operate when receiving downlink scheduling information and uplink allocation grant in a same subframe. A receiving section which receives the information via the physical uplink control channel, and an uplink data receiving section which receives the uplink data via the physical uplink shared channel, wherein the receiving section and the uplink data receiving section operate after a predetermined time when sending the downlink scheduling information and the uplink allocation grant in the same subframe.

Abstract: An generation section which generates information indicative of a result of error detection on a downlink signal received, and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel, whereby the generation section and the sending section operate when receiving downlink scheduling information and uplink allocation grant in a same subframe. A receiving section which receives the information via the physical uplink control channel, and an uplink data receiving section which receives the uplink data via the physical uplink shared channel, wherein the receiving section and the uplink data receiving section operate after a predetermined time when sending the downlink scheduling information and the uplink allocation grant in the same subframe.

Abstract: A mobile station for performing radio communication with a radio base station, the mobile station includes an information generation section which generates information indicative of a result of error detection on a downlink signal received; and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel; whereby the information generation section and the sending section operate when the mobile station receives downlink scheduling information and uplink allocation grant in a same subframe.

Abstract: A user terminal transmits a preamble signal generated using a Zadoff-Chu sequence. A correlation processing unit calculates autocorrelation of a received preamble signal. A preamble detection unit detects a side peak position of the autocorrelation of the preamble signal and calculates the main correlation value representing correlation at the main peak position and the side correlation value representing correlation at the side peak position. A frequency offset estimation unit estimates frequency offset that has occurred in the wireless transmission path according to the main correlation value and the side correlation value.

Abstract: A communication system, including a transmitter that transmits a signal by using a two-dimensional spread code used for making a spread in time and frequency directions and a receiver that receives the signal transmitted from the transmitter, where the transmitter includes a selecting unit that selects spread codes in which at least one of the time and the frequency directions are mutually orthogonal, and a transmitting unit that spreads a signal by using the selected spread codes and transmits the signal, where each of the selected spread codes are able to be split in two or more parts, which are mutually orthogonal with the same parts of other selected spread codes in at least one of the time and the frequency directions.

Abstract: A communication system that transmits individual control information to a plurality of respective user terminals using a shared control channel, wherein when transmitting individual control information and prescribed control information to the user terminals, a base station device divides user terminals into groups according to the contents of the prescribed control information for the respective user terminals, arranges the individual control information for each user terminal in a specified group order, creates number-in-group information wherein the number of user terminals belonging to each group is arranged in the group order, and transmits the number-in-group information together with the individual control information for each user terminal in the group order.

Abstract: An error detection coding processing section of the radio base station performs an error detection coding process with data including both first control data to be used for receiving a downlink signal and second control data to be used for sending an uplink signal as a unit. A sending section sends data on which the error detection coding process has been performed by the error detection coding processing section to the mobile station.