Abstract:
The invention relates to a terminal apparatus for performing communication with another terminal apparatus, comprising a receiving unit that performs carrier sense to confirm a status of use of a channel using either one of a first threshold and a second threshold; and a transmitting unit that transmits frames. The receiving unit receives a first frame including control information indicating whether to allow carrier sense based on the first threshold, wherein the control information is configured for each frequency resource of the channel, and the control information includes information associated with a power control of the terminal apparatus. The invention further relates to a method for use in a terminal apparatus for performing communication with another terminal apparatus.
Abstract:
A multiplexing timing signal generator (1) generates a multiplexing timing signal activated for each interval corresponding to a number of chips delayed in multiplexing between data to be transmitted. Driven by the multiplexing timing being active, each operation unit multiplies identical data to be transmitted by a chip of a spreading code sequence and each chip corresponding to a spread spectrum result is added in an operation unit 3(1) to an offset value and in operation units 3(2)-3(N) to their respective, immediately preceding registers 2(1)-2(N-1) values and output as signals for subsequent registers 2(1)-2(N). Thus a multiplexing process is effected. Data to be transmitted has its spectrum spread by a spreading code sequence C1-CN and a result of multiplexing the same in response to a multiplexing timing signal is output from a register(2(N)) by 1 chip at a time in synchronization with a clock signal.
Abstract:
Provided is a communication system that can allocate resources on an uplink for a CQI report, and can reduce the overhead of the CQI relay transmission from a relay station apparatus to a base station apparatus. To each mobile station apparatus (501, 502) that transmits CQI directly to a base station apparatus (500), resource blocks on a base station apparatus uplink to be used for the transmission of each CQI to the base station apparatus are allocated. To each mobile station apparatus (511 to 513, 521 to 524) that transmits CQI to the base station apparatus via each relay station apparatus (510, 520), resource blocks on a relay station apparatus uplink to be used for the transmission of each CQI to the relay station apparatus are allocated. Resource blocks on the base station apparatus uplink to be used for each relay station apparatus to relay-transmit to the base station apparatus the CQI received from the mobile station apparatus are allocated on the basis of the allocation result of the resource blocks on the relay station apparatus uplink for each relay station apparatus.
Abstract:
An object of the present invention is to improve the throughput and reduce the circuit size and power consumption for transmission. A wireless communication device that performs wireless communication in a multi-carrier transmission system using a frame composed of a plurality of sub-frames, which includes: an extraction part (8) extracting a modulation parameter from a modulation information sub-frame for constituting a received frame and notifying a receiving side of the modulation parameter of each sub-carrier; a storage part (9) storing the extracted modulation parameter; and a modulation control part (10) performing at least one of coding of transmission data and modulation of each sub-carrier using a stored modulation parameter when transmitting a frame to a transmission source of a frame, and which transmits a frame containing no modulation information sub-frame to the transmission source of the frame.
Abstract:
There is provided a terminal apparatus (2, 12), comprising: a carrier sense unit (12002, 22002) equipped with a function of performing charrier sense for checking a situation of a channel using a threshold value, and a function of changing the threshold value from a predetermined value, a reception unit (11005) equipped with a function of receiving a frame, a transmission unit (21004) equipped with a function of transmitting a transmit frame, a transmit power control unit (21003) equipped with a function of changing a transmit power from a predetermined transmit power based on at least the information included in the frame when the threshold value is changed from the predetermined value, and setting a transmit power to the predetermined transmit power when the threshold value is identical to the predetermined value.
Abstract:
Disclosed is a transmission device including a plurality of antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a DRS generator configured to generate DRSs (dedicated reference signals) for the respective reception devices; a nonlinear spatial multiplexer configured to generate a nonorthogonal DRS by use of a first group of DRSs including at least one of the DRSs; and a transmitter configured to transmit a signal containing at least the nonorthogonal DRS.
Abstract:
The disclosed is a transmission device including a plurality of transmission antennas for transmitting signals in the same channel at the same time point to a plurality of reception devices, characterized by including: a dedicated reference signal generator configured to generate dedicated reference signals for the respective reception devices; a data signal generator configured to generate data signals for the respective reception devices; a spatial multiplexer configured to spatially multiplex at least some of the dedicated reference signals and at least some of the data signals; and a transmitter configured to transmit the spatially multiplexed signals..
Abstract:
Reception quality measurement results of respective channels which have been outputted from a reception quality measuring section 308 are inputted to a selected channel determining section 341 and a channel quality information generating section 342. Moreover, the number of selected channels M which has been previously defined or the number of selected channels M which has been outputted from a control information obtaining section 314 is inputted to the selected channel determining section 341 and a channel identification information generating section 343. The selected channel determining section 341 selects M channels in order of goodness of the reception quality measurement result, as the selected channels, based on the reception quality measurement results of the respective channels, and outputs a selection result. The channel quality information generating section 342 generates and outputs channel quality information representing the reception quality measurement results related to the selected M channels, based on the selection result outputted from the selected channel determining section 341. The channel identification information generating section 343 selects one of a first representation format for representation with M identification numbers (channel numbers) indicating the respective selected channels, and a second representation format for representation with a bit sequence representing whether or not each of all the channels is included in the selected channels, in a binary manner, based on the number of selected channels M, and uses the selected representation format to generate and output channel identification information based on the selection result outputted from the selected channel determining section 341. A multiplexing section 344 combines the channel quality information outputted from the channel quality information generating section 342 and the channel identification information outputted from the channel identification information generating section 343 to generate and output notification information.
Abstract:
Communication opportunities of existing terminal devices are ensured, in a communication system in which terminal devices capable of using a new CCA level and the existing terminal devices using an existing CCA level coexist, on the premise of CSMA/CA. A communication method of a radio transmission device of the present invention includes a step of signaling information indicating a first CCA section and a second CCA section to the radio reception device. A communication method of a radio reception device of the present invention includes a step of performing the carrier sense based on a first CCA level and a second CCA level, and a step of performing the carrier sense based on the first CCA level, in the first CCA section, based on information indicating the first CCA section.