Abstract: A re-transmission control method of downlink data to be transmitted from a radio base station to a radio terminal includes: by the radio terminal, transmitting information regarding decoding performance of the radio terminal to the radio base station; receiving the downlink data from the radio base station; transmitting a re-transmission request of the downlink data to the radio base station in a case where an error in the downlink data is detected; receiving a re-transmission configuration based on the information regarding decoding performance of the radio terminal, from the radio base station in a physical downlink control channel (PDCCH), after transmission of the re-transmission request; receiving the downlink data re-transmitted from the radio base station; and decoding the re-transmitted downlink data in accordance with the re-transmission configuration.

Abstract: A re-transmission control method of downlink data to be transmitted from a radio base station to a radio terminal includes: by the radio terminal, transmitting information regarding decoding performance of the radio terminal to the radio base station; receiving the downlink data from the radio base station; transmitting a re-transmission request of the downlink data to the radio base station in a case where an error in the downlink data is detected; receiving a re-transmission configuration based on the information regarding decoding performance of the radio terminal, from the radio base station in a physical downlink control channel (PDCCH), after transmission of the re-transmission request; receiving the downlink data re-transmitted from the radio base station; and decoding the re-transmitted downlink data in accordance with the re-transmission configuration.

Abstract: A wireless communication system includes a terminal; and a base station configured to perform uplink scheduling. The terminal transmits to the base station, a signal that includes a scheduling request and a buffer state index value of the terminal. The base station performs scheduling for the terminal, based on the buffer state index value.

Abstract: A base station including: a memory, and a processor configured to: determine whether each random access signal is detected or not by comparing each of specified characteristics of each of radio resources prepared for each random access signal with a detection threshold, each of the specified characteristics relating to each reception power of each of the radio resources prepared for each random access signal, the radio resources being divided into first radio resources and second radio resources, the first radio resource being prepared for dedicated random access signals each transmitted from each terminal in response to each request signal transmitted from the base station, and determine the detection threshold based on each of the specified characteristics of each of unused first radio resources, each of the unused first radio resource being each of the first radio resources for which each request signal has not been transmitted from the base station.

Abstract: A communication apparatus includes a memory, and a processor coupled to the memory and configured to receive a first reception signal and a second reception signal in a first period, calculate a first phase rotation quantity between the first reception signal and the second reception signal, receive a third reception signal and a fourth reception signal in a second period, calculate a second phase rotation quantity between the third reception signal and the fourth reception signal, determine whether to compensate for a frequency offset of a fifth reception signal based on a difference between the first phase rotation quantity and the second phase rotation quantity, and when it is determined to compensate for the frequency offset of the fifth reception signal, compensate for the frequency offset of the fifth reception signal.

Abstract: A wireless communication system includes a terminal; and a base station configured to perform uplink scheduling. The terminal transmits to the base station, a signal that includes a scheduling request and a buffer state index value of the terminal. The base station performs scheduling for the terminal, based on the buffer state index value.

Abstract: A base station apparatus executes a first scheduling of allocating a first radio resource in a first frequency band used in a first wireless communication standard to a first terminal device, and executes a second scheduling of allocating a second radio resource in a second frequency band used in a second wireless communication standard to a second terminal device, wherein the second frequency band is broader than the first frequency band, the first frequency band is included in the second frequency band, when the first radio resource is not allocated in the first scheduling, the first frequency band is allocated as the second radio resource in the second scheduling, and when the first radio resource is allocated in the first scheduling, a frequency band other than the first frequency band in the second frequency band is allocated as the second radio resource in the second scheduling.

Abstract: A processor performs a process that includes decoding, from among a radio signal received by the radio signal receiving apparatus, control data that includes information indicating frequency bands that a mobile station apparatus is capable of dealing with, component carriers and scenarios for carrier aggregation, receiving the decoded control data, calculating, in accordance with the received control data, a transmission-bandwidth adjacency level value indicating a policy on component-carrier allocation to the mobile station apparatus, determining, in accordance with the calculated transmission-bandwidth adjacency level value, a component carrier to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with; and generating a transmission signal that includes information indicating the determined component carrier.

Abstract: Provided is a base station including a communication processor configured to perform a communication process, a first scheduler configured to allocate radio resources to one or more first wireless communication terminals that perform wireless communication through the communication process performed by the communication processor, a second scheduler configured to allocate radio resources to one or more second wireless communication terminals that perform wireless communication through the communication process performed by the communication processor, and a controller configured to perform control such that a first time interval in which the first scheduler allocates the radio resources to the one or more of first wireless communication terminals is different from a second time interval in which the second scheduler allocates the radio resources to the one or more of second wireless communication terminals.

Abstract: A terminal apparatus includes a downlink transceiver that receives downlink data via a base station governing a first cell and exchanges with the base station governing the first cell, control information that is for receiving the downlink data; and an uplink transceiver that transmits uplink data via a base station governing a second cell that is different from the first cell and exchanges with the base station governing the second cell, control information that is for transmitting the uplink data.

Abstract: A baseband receiving unit receives a signal transmitted from a wireless communication terminal device and including a plurality of symbols arranged in a time direction. A scheduling unit estimates the frequency offset based on a first signal that is for measuring quality and that is mapped to a first symbol placed at a predetermined position in the transmitted signals received with the baseband receiving unit, and a second signal that is for demodulation and that is mapped to a second symbol placed at a position different from the first symbol in the transmitted signal.

Abstract: A base station apparatus includes an area setting module that sets a part of an area of resources used for communication with a radio communication terminal devices as a search area, a plurality of selecting modules that each select a resource included in the search area and belonging to a group allocated to the scheduler of each of the selecting modules out of groups divided based on logical positions of resources, and an L1 function module that transmits a signal including control information by using the resource selected. The radio communication terminal device includes an acquiring module that receives the signal and searches the search area in the received signal to acquire control information addressed to the radio communication terminal device, and a communication module that communicates with the radio base station based on the control information acquired.

Abstract: A communication apparatus includes a memory, and a processor coupled to the memory and configured to receive a first reception signal and a second reception signal in a first period, calculate a first phase rotation quantity between the first reception signal and the second reception signal, receive a third reception signal and a fourth reception signal in a second period, calculate a second phase rotation quantity between the third reception signal and the fourth reception signal, determine whether to compensate for a frequency offset of a fifth reception signal based on a difference between the first phase rotation quantity and the second phase rotation quantity, and when it is determined to compensate for the frequency offset of the fifth reception signal, compensate for the frequency offset of the fifth reception signal.

Abstract: A base station including: a memory, and a processor configured to: determine whether each random access signal is detected or not by comparing each of specified characteristics of each of radio resources prepared for each random access signal with a detection threshold, each of the specified characteristics relating to each reception power of each of the radio resources prepared for each random access signal, the radio resources being divided into first radio resources and second radio resources, the first radio resource being prepared for dedicated random access signals each transmitted from each terminal in response to each request signal transmitted from the base station, and determine the detection threshold based on each of the specified characteristics of each of unused first radio resources, each of the unused first radio resource being each of the first radio resources for which each request signal has not been transmitted from the base station.

Abstract: A base station performs scheduling in a second cell, for a candidate terminal performing coordinated communication using a first cell and the second cell. The base station includes an acquiring unit and a determining unit. The acquiring unit acquires a scheduled communication timing for the candidate terminal in the first cell, and a scheduling index for the candidate terminal. The determining unit determines whether the candidate terminal is permitted to communicate at the scheduled communication timing in the second cell, based on the scheduling index for the candidate terminal and a scheduling index for another terminal that is located in the second cell.

Abstract: A baseband receiving unit receives a signal transmitted from a wireless communication terminal device and including a plurality of symbols arranged in a time direction. A scheduling unit estimates the frequency offset based on a first signal that is for measuring quality and that is mapped to a first symbol placed at a predetermined position in the transmitted signals received with the baseband receiving unit, and a second signal that is for demodulation and that is mapped to a second symbol placed at a position different from the first symbol in the transmitted signal.

Abstract: A base station apparatus includes an area setting module that sets a part of an area of resources used for communication with a radio communication terminal devices as a search area, a plurality of selecting modules that each select a resource included in the search area and belonging to a group allocated to the scheduler of each of the selecting modules out of groups divided based on logical positions of resources, and an L1 function module that transmits a signal including control information by using the resource selected. The radio communication terminal device includes an acquiring module that receives the signal and searches the search area in the received signal to acquire control information addressed to the radio communication terminal device, and a communication module that communicates with the radio base station based on the control information acquired.

Abstract: A processor performs a process that includes decoding, from among a radio signal received by the radio signal receiving apparatus, control data that includes information indicating frequency bands that a mobile station apparatus is capable of dealing with, component carriers and scenarios for carrier aggregation, receiving the decoded control data, calculating, in accordance with the received control data, a transmission-bandwidth adjacency level value indicating a policy on component-carrier allocation to the mobile station apparatus, determining, in accordance with the calculated transmission-bandwidth adjacency level value, a component carrier to be allocated to the mobile station apparatus from among the component carriers and the frequency bands that the mobile station apparatus is capable of dealing with; and generating a transmission signal that includes information indicating the determined component carrier.

Abstract: A wireless terminal including: a receiver configured to receive information for identifying at least one first cell in a wireless communication system including the at least one first cell and at least one second cell, each of the at least one first cell having a uplink carrier and a downlink carrier, each of the at least one second cell having no uplink carrier and a downlink carrier, and a processor configured to couple to one of the at least one first cell that is selected in accordance with the received information.

Abstract: A communication apparatus including: a receiver to receive signals including reference signals at each of a plurality of different reception intervals; and a processor to estimate phase differences between the signals based on the reference signals, to determine a plurality of phase difference candidates for each of the reception intervals based on the phase differences, to select, from among a plurality of combinations of the phase difference candidates for the reception intervals, a combination of the phase difference candidates between the signals, and to estimate a frequency deviation of the signals based on the phase difference candidates included in the combination.