Abstract: Embodiments of the present disclosure provide a receiving device and a transmitting device. The receiving device according to the embodiments of the present disclosure includes: a transceiving unit, configured to receive multiple un-precoded data streams sent through a plurality of antenna ports in a transmitting device; and a control unit, configured to determine an equivalent digital baseband channel matrix for a respective one of the plurality of antenna ports based on information on the intensity of a line of sight (LOS) channel component, and demodulate the multiple data streams according to the equivalent digital baseband channel matrix. The transmitting device according to the embodiments of the present disclosure includes: a control unit, configured to determine multiple un-precoded data streams for a receiving device; and a transceiving unit, including a plurality of antenna ports, respective ones of the plurality of antenna ports being configured to send the multiple data streams.

Abstract: Provided in the present disclosure are a terminal and a sending device in a communication system. The sending device includes: a receiving unit, which is configured to receive position information of a terminal, and a control unit, which is configured to determine a first codeword in a first codebook and offset information according to the position information. The first codeword indicates initial phases of at least some array elements in a reconfigurable intelligent surface (RIS). The offset information indicates an offset relative to the at least one of the at least some array elements, the initial phases, and a reference position of the RIS.

Abstract: Provided in the embodiments of the present disclosure are a receiving device and a transmitting device. The receiving device according to the embodiments of the present disclosure includes: a control unit, configured to determine information on intensity of a light-of-sight (LOS) channel component in a communication channel; and a sending unit, configured to send the determined information to a transmitting device. The transmitting device according to the embodiments of the present disclosure includes: a transceiving unit, which includes a first antenna array; and a control unit, configured to obtain information about the intensity of a light-of-sight (LOS) channel component in a communication channel, and to determine a configuration mode of the first antenna array according to the information.

Abstract: The present disclosure provides a reconfigurable intelligent surface, including: a receiving unit which receives subarray division setting information sent from a base station; a reconfigurable panel; and a processing unit, which divides, based on the subarray division setting information, the reconfigurable panel into M subarrays, where M is a positive integer greater than 1, wherein, the subarray division setting information is determined based on a distance between a target device and the reconfigurable panel, N subarrays of the M subarrays serve one target device, and N is a positive integer greater than 1 and less than or equal to M.

Abstract: A radiowave propagation estimation device uses identification information enabling an object including a structure to be identified, and map data including the structure, to extract a structure of the object which is visible from both a direct or pseudo transmission point of radiowaves and a direct or pseudo reception point of the radiowaves, on the basis of the identification information. The radiowave propagation estimation device estimates a propagation characteristic of the radiowaves by using information indicating a characteristic of the extracted structure of the object.

Abstract: The present disclosure provides a base station. The base station includes: a control unit configured to determine configuration information regarding a reconfigurable surface device based on location of a user equipment; and a transmitting unit configured to send the configuration information to the reconfigurable surface device so that the reconfigurable surface device determines a codebook used by the reconfigurable surface device based on the configuration information.

Abstract: Deterioration in communication characteristics is prevented by performing scheduling in which movement/stillness of user terminals is taken into consideration. Received-power measurement section 103 measures the power of a reference signal from each of the user terminals. Movement/stillness determination section 104 determines whether each of the user terminals is a moving terminal or an unmoving terminal based on over-time variations in received power at transmission points for each of the user terminals. Group selection section 105 groups the user terminals into a moving terminal group and an unmoving terminal group, and selects one of the groups as a signal-transmission target. Transmission control section 108 performs open-loop signal processing without precoding when the moving terminal group is selected, or performs closed-loop signal processing with precoding when the unmoving terminal group is selected.

Abstract: This base station has: a control unit that determines, on the basis of information shown by the movement of a terminal, a linking method for signal transmission by a plurality of wireless stations, and the number of streams of each wireless station; and a transmission unit that links the plurality of wireless stations according to the determined linking method, and transmits a signal to a terminal using the streams.

Abstract: This base station comprises: a control unit that allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams; and a transmission unit that transmits the common downlink reference signal via the plurality of beams. According to this base station communication method, the base station allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams, and transmits the common downlink reference signal via the plurality of beams.

Abstract: A control apparatus includes a control section that determines, for each terminal, a method for a coordinated operation performed between a plurality of radio apparatuses for signal transmission to the terminal, and a transmission section that outputs control information on the method determined.

Abstract: A communication apparatus is disclosed including a reception unit that receives an uplink signal; a control unit that determines one or more signal processes to be applied to the uplink signal, among a plurality of signal processes for the uplink signal; and a transmission unit that transmits to a backhaul the uplink signal that received the determined one or more signal processes. In another aspect, a communication method is also disclosed.

Abstract: A radio terminal that performs radio communication with a radio base station including a plurality of transmission points each including at least one antenna element and a signal processing unit connected to the plurality of transmission points includes a plurality of antenna elements, an estimating section that estimates path-loss between each of the plurality of antenna elements and the plurality of transmission points, and a calculating section that calculates a power control weight for controlling transmission power of the plurality of antenna elements based on the path-loss for the antenna element that has been estimated by the estimating section.

Abstract: Radio base station 10 in a radio communication system that performs MIMO transmission between a plurality of radio base stations and at least one user terminal 20 includes: precoding section 110 that applies precoding to data signals based on channel information indicating channels between radio base stations 10 and the user terminal; and communication section 112 that transmits the precoded data signals, in which the precoding in a first radio base station of the plurality of radio base stations is applied based on the channel information including at least a channel between the first radio base station and a first user terminal connected to a second radio base station other than the first radio base station.

Abstract: This base station comprises: a control unit that allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams; and a transmission unit that transmits the common downlink reference signal via the plurality of beams. According to this base station communication method, the base station allocates, on the basis of a doppler shift estimated using an uplink reference signal, a downlink reference signal common to a plurality of beams, and transmits the common downlink reference signal via the plurality of beams.

Abstract: A radio base station includes: an obtaining section that obtains a first communication quality of each of first communication terminals and obtains a second communication quality of each of second communication terminals having a lower communication speed than the first communication terminals; and a scheduler that schedules the first communication terminals based on the first communication qualities and schedules the second communication terminals based on the second communication qualities, and when the scheduler schedules the first communication terminals and the second communication terminals, the scheduler subjects the first communication terminals to space-division multiplexing and subjects the second communication terminals to frequency-division multiplexing or time-division multiplexing.

Abstract: In a radio base station including: a plurality of transmission points each including at least one antenna element; and a signal processing unit connected to the plurality of transmission points, the signal processing unit includes: an estimating section that estimates, in each of the antenna elements, a path-loss with a radio terminal; and a calculating section that calculates a power control weight for controlling transmission power of each of the antenna elements based on the path-loss of the antenna element, which is estimated by the estimating section.

Abstract: User terminal 20 configured to perform MIMO transmission with radio base station 10 includes: control section 200 configured to generate first channel estimation information based on a reference signal transmitted by radio base station 10, and perform an operation for elimination of an interference signal on the first channel estimation information to generate second channel estimation information; and postcoder 208 configured to perform postcoding, based on the second channel estimation information, on a data signal to be transmitted by the radio base station 10, so as to detect a desired signal.

Abstract: Radio base station 10 configured to perform MIMO transmission with user terminals 20 includes: beam selecting section 100 configured to select at least one used beam from among a plurality of beams based on beam-selection reference parameters to be computed based on beam information transmitted by user terminals 20; and user terminal selecting section 102 configured to select, from among at least one of user terminals 20 which has selected the at least one used beam, at least one of user terminals 20 to be a target for the at least one used beam.

Abstract: Deterioration in communication characteristics is prevented by performing scheduling in which movement/stillness of user terminals is taken into consideration. Received-power measurement section 103 measures the power of a reference signal from each of the user terminals. Movement/stillness determination section 104 determines whether each of the user terminals is a moving terminal or an unmoving terminal based on over-time variations in received power at transmission points for each of the user terminals. Group selection section 105 groups the user terminals into a moving terminal group and an unmoving terminal group, and selects one of the groups as a signal-transmission target. Transmission control section 108 performs open-loop signal processing without precoding when the moving terminal group is selected, or performs closed-loop signal processing with precoding when the unmoving terminal group is selected.

Abstract: A transmission and reception apparatus includes a plurality of antenna ports. The transmission and reception apparatus includes at least one orthogonal beam fixed beamforming circuit and a high-speed switching circuit between a transmission and reception circuit and the antenna ports. For example, the transmission and reception circuit outputs a transmission signal subjected to transmission signal processing to the high-speed switching circuit during signal transmission, the high-speed switching circuit selects at least one port from a plurality of ports provided at the orthogonal beamforming circuit, and outputs the transmission signal to the selected port, and the orthogonal beamforming circuit forms a beam corresponding to the selected port to transmit the transmission signal.