Abstract: A base station in a communications system for exchange of information, includes, a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information with a mobile station; a transmitter configured to transmit the frequency band information, using a specific frequency band which is set from among a plurality of frequency band assigned to the communications system, and to transmit data information by using at least one frequency band set from among said plurality of frequency bands; wherein at least one frequency band set from among said plurality of frequency bands, other than the specific frequency band, is made variable, wherein at the time of establishing the wireless channel, the frequency band usable by the mobile station is restricted, at least one frequency band, other than the specific frequency band, are dynamically assigned within that restricted frequency band.

Abstract: A transmission controlling method for a wireless communication system wherein a plurality of data blocks can be transmitted from a sender apparatus having a plurality of sending antennas to a receiver apparatus, the transmission controlling method including on the sender apparatus, sending process information which prevent plurality of data blocks from competing to the receiver apparatus with a control channel; and on the receiver apparatus, combining, based on the process information, the data block received already and a re-sent data block.

Abstract: A communication apparatus for communicating via a frame containing a plurality of first type blocks into which pilot information is inserted and a plurality of second type blocks into which control information or data is inserted, the communication apparatus including a channel estimation accuracy predicting unit for predicting channel estimation accuracy of each of the plurality of second type blocks based on channel estimate values of the plurality of first type blocks in the frame. The communication apparatus includes an allocation determining unit for determining an allocation based on priority information containing a priority of each type of the control information and data such that control information or data of a higher-priority type is inserted into a block among the plurality of second type blocks with higher channel estimation accuracy.

Abstract: A communications system that includes a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between said communication apparatuses; a transmitter configured to transmit the frequency band information by using a specific frequency band, set from among a plurality of frequency band assigned to the communications system, to transmit data information using at least one frequency band set from among said plurality of frequency bands; a receiver configured to receive the frequency band information, using the specific frequency band. The frequency band set as said at least one frequency band set from among said plurality of frequency bands, other than the specific frequency band, is made variable, at the time of establishing the wireless channel, the frequency band usable by the communications apparatus is restricted.

Abstract: A communications system for exchange of information between communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers, the communication system includes a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between said communication apparatuses and a transmitter configured to transmit the frequency band information by using a specific frequency band which is set from among a plurality of frequency band assigned to the communications system, and to transmit data information by using at least one frequency band set from among said plurality of frequency bands; and a receiver configured to receive the frequency band information by using the specific frequency band, wherein bandwidths of said plurality of frequency bands are made a predetermined value, and also numbers of subcarriers in each of the bands are made a predetermined value.

Abstract: A communications system for exchange of information between communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers, that includes a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data between said communication apparatuses; a transmitter configured to transmit the frequency band information, using a specific frequency band, set from among a plurality of frequency band assigned to the communications system, to transmit data using at least one frequency band set from among said plurality of frequency bands; a receiver configured to receive the frequency band information by using the specific frequency band, wherein one or more of said frequency band is assigned not consecutive with said specific frequency band along a frequency axis, and at least one not used subcarrier is inserted between the specific frequency and the frequency band or between said frequency bands.

Abstract: A base transceiver station performing communications with user equipment, includes a receiving unit to receive an uplink transmission signal containing a propagation path fluctuation value between a self-device and the user equipment from the user equipment; and a communication permitting unit to control a period of time during which a permission of communications is given to the user equipment based on the propagation path fluctuation value.

Abstract: A radio communication system includes a mobile station configured to: intermittently receive information indicating a transmission format used for a shared channel via which data is received from a radio communication apparatus, intermittently transmit Channel Quality Indicator (CQI) information relating to the transmission format used for the shared channel in a first mode, set the timing of the intermittent transmission of the CQI information a given time before the reception of the information indicating a transmission format used for the shared channel, the CQI information being transmitted periodically, and switch from the first mode to a second mode in which the CQI information is transmitted more frequently than in the first mode; and the radio communication apparatus configured to communicate with the mobile station.

Abstract: A technique for improving the efficiency of downloading transmission data is disclosed. An information downloading apparatus downloads differing sets of information to predetermined groups to which a mobile terminal may belong. This apparatus includes a channel selecting unit for selecting from plural information channels an information channel for transmitting transmission data and a transmitting unit for transmitting transmission data using the selected information channel. The channel selecting unit selects an information channel so that sets of transmission data with differing destination addresses may be transmitted through differing information channels. The transmitting unit transmits to each group, through a control channel, information pertaining to whether a set of transmission data exists, the information channel to be used if the set of transmission data exists, and the data length of the set of transmission data. The control channel includes time slots that are associated with the groups.

Abstract: A communications apparatus accommodated in a communications system for exchange of information between a communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers. The communications apparatus includes a dedicated transmission data generator for each communications apparatus, configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between each communications apparatus; and a transmitter configured to transmit the dedicated frequency band information with dedicated control channel for each communications apparatus by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, in which the specific frequency band is set as a primary band in a frequency band assigned to the communication system.

Abstract: In a wireless communication system, a sender apparatus sends a data block, for each of a plurality of stream data, with data block identification information, which does not conflict between stream data, annexed, and a reception apparatus performs a re-sending synthesis process for a data block received already and a re-sending data block to which the same data block identification information is individually annexed based on the data block identification information annexed to the received data block. Consequently, also in a case wherein the number of transmission streams between the sender apparatus and the reception apparatus is varied (reduced), the matching property of the data block which is a re-sending synthesis target can be maintained and communication can be continued normally.

Abstract: A base transceiver station performing communications with user equipment, includes a receiving unit to receive an uplink transmission signal containing a propagation path fluctuation value between a self-device and the user equipment from the user equipment; and a communication permitting unit to control a period of time during which a permission of communications is given to the user equipment based on the propagation path fluctuation value.

Abstract: A wireless communication system including a sender apparatus having a plurality of transmitting antennas that transmits a plurality of data blocks; and a receiver apparatus that receives the plurality of data blocks, wherein the sender apparatus transmits a process number via a control channel different from a data channel to the receiver apparatus, and wherein the receiver apparatus performs HARQ processing of received data blocks based on the received process number which prevents the data blocks from competing.

Abstract: A communications apparatus accommodated in a communications system for exchange of information between a communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers. The communications apparatus comprises of a dedicated transmission data generator for each communications apparatus, configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between each communications apparatus and a transmitter configured to transmit the dedicated frequency band information for each communications apparatus by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, in which the specific frequency band is set as a primary band in frequency band assigned to the communication system.

Abstract: A radio communication apparatus that includes a receiver that accomplishes intermittent reception of information in a first mode, the information indicating a transmitting format used for a shared channel via which data is received and a transmitter that accomplishes intermittent transmission of quality information at a timing in the first mode, the quality information relating to the transmitting format; and a controller that sets in advance the timing of the intermittent transmission so as to become a given time before a timing of the intermittent reception.

Abstract: A wireless relay device that transmits a reception signal from a transmission device to a reception device includes a determination section configured to determine whether or not the reception signal is a retransmission signal retransmitted from the transmission device, and an amplification section configured to amplify the reception signal when the determination section determines that the reception signal is the retransmission signal, and not to amplify the reception signal when the determination section determines that the reception signal is not the retransmission signal.

Abstract: A communications system for exchange of information between communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers, the communication system comprising: a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between said communication apparatuses and a transmitter configured to transmit the frequency band information by using a specific frequency band which is set from among a plurality of frequency band assigned to the communications system, and to transmit data information by using at least one frequency band set from among said plurality of frequency bands and a receiver configured to receive the frequency band information by using the specific frequency band. Furthermore, at least one frequency band set from among said plurality of frequency bands, other than the specific frequency band, is made variable.

Abstract: A communications system for exchange of information between communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers, includes a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between said communication apparatuses; a transmitter configured to transmit the frequency band information by using a specific frequency band which is set from among a plurality of frequency band assigned to the communications system, and to transmit data information by using at least one frequency band set from among said plurality of frequency bands; a receiver configured to receive the frequency band information by using the specific frequency band, whereby the specific frequency band among said plurality of frequency bands and at least one frequency band set among the plurality of frequency bands, other than the specific frequency band, are made variable to avoid overlap.

Abstract: A handover control method in a mobile communication system that performs handover control by switching base stations that communicate with a mobile terminal as the mobile terminal moves. In this handover control method, a mobile control device selects one or more handover base station candidates based on the communication state, and based on the communication capabilities of the handover base station candidates, decides a transmission rate for multicasting communication data, and transmits communication data to each of the handover base station candidates at the decided transmission rate, and a handover base station candidate that is decided as a handover base station sends the saved multicast communication data to the mobile terminal.

Abstract: During handover, an origin base station saves data packets for a mobile station, as well as instructs the mobile station to switch communication to a destination base station, and requests a host station to switch the base station that communicates with that mobile station from the origin base station to the destination base station. After that, when in accordance to the switching request it is possible to save data packets, the host station begins to save the data packets for the mobile station in the place of the origin base station, and after communication between the mobile station and the destination base station has become possible, sends the saved data packets to the mobile station via the destination base station.