Abstract: This application relates to a communication method and device. A first terminal device sends first SCI in N first time units, where the first SCI indicates first configuration information, the first configuration information includes a resource of a first periodic transmission, the first periodic transmission includes M transmissions, a transmission cycle of the first periodic transmission is a first cycle, the M transmissions include P transmission time units, N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N. The first terminal device sends, in N second time units, second SCI associated with the first SCI. The first terminal device does not need to send SCI for all transport blocks of a service of the first periodic transmission.

Abstract: A communication method includes sending capability information to a network device, where the capability information indicates antenna ports supported by P frequency domain units of a terminal device, and an antenna port supported by an ith frequency domain unit in the P frequency domain units includes an antenna port associated with the ith frequency domain unit and an antenna port that is in antenna ports associated with Ni frequency domain units in the P frequency domain units and that can be switched to the ith frequency domain unit.

Abstract: A terminal device reports first capability information to a network device, where the first capability information indicates that values of a maximum quantity of downlink MIMO layers supported by the terminal device on a first component carrier CC include a first maximum quantity M1 of downlink MIMO layers and a second maximum quantity M2 of downlink MIMO layers; and the terminal device receives first signaling sent by the network device, where the first signaling configures maximum MIMO layer quantity information corresponding to the first CC, and the maximum MIMO layer quantity information includes a first maximum quantity N1 of MIMO layers and a second maximum quantity N2 of MIMO layers.

Abstract: This application provides a PSCCH detection method and a communication apparatus. In the method, a first terminal device may detect a first PSCCH based on a resource included in a candidate resource set indicated by first indication information. This avoids overheads caused when the first terminal device needs to blindly detect the PSCCH, and helps reduce energy consumption. In particular, when a bandwidth is relatively large or there are a relatively large quantity of sub-channels, this can avoid overheads caused when the first terminal device needs to blindly detect the PSCCH.

Abstract: In accordance with an embodiment, a communication method includes: sending, by a first device, a first reference signal of M (M>2) ports; and receiving, by the first device, first indication information that indicates a first precoding matrix in a target codebook. The first precoding matrix is associated with the first reference signal, and the target codebook includes at least one target precoding matrix that is a partially coherent precoding matrix or a coherent precoding matrix.

Abstract: In accordance with an embodiment, a method includes sending a first message to a network device includes capability information of a terminal device that indicates antenna ports supported by P frequency domain units of the terminal device, and an antenna port supported by an ith frequency domain unit in the P frequency domain units includes an antenna port associated with the ith frequency domain unit and an antenna port that can be switched to the ith frequency domain unit in antenna ports associated with Ni frequency domain units in the P frequency domain units; and receiving configuration information from the network device, where the configuration information configures at least two sounding reference signal (SRS) resources for a first frequency domain unit of the terminal device, and the first frequency domain unit is associated with first uplink transmission configuration information.

Abstract: A first transmitting terminal sends a first channel state information-reference signal CSI-RS in N frequency domain units, where N is a positive integer. The first transmitting terminal detects channel state information CSI sent by K receiving terminals, where the CSI sent by the K receiving terminals is determined based on the first CSI-RS, and K is a positive integer. The first transmitting terminal updates a transmit power of the first transmitting terminal in the N frequency domain units based on the CSI sent by the K receiving terminals. When updated powers of F frequency domain units in the N frequency domain units are greater than a preset threshold, the first transmitting terminal sends user data in at least one of the F frequency domain units, where F is a positive integer less than or equal to N.

Abstract: According to the present disclosure there is provided a multiple-input-multiple-output (MIMO) transmitter for transmitting wireless communication signals over a communication channel to a receiver, the transmitter including a digital signal processor configured to perform pre-coding on a plurality Ns of data streams; a plurality NRF of radio-frequency (RF) chains each configured to pass a pre-coded data stream from the digital signal processor to generate a signal representing that data stream; a lens antenna array comprising an array of NT antenna elements; and a selecting unit coupled between the plurality NRF of RF chains and the lens antenna array, the selecting unit including a plurality of separate coupling units each configured to couple a respective RF chain to a selective sub-array of NTBRF antenna elements concurrently for transmitting the signal representing the data stream passed through that RF chain.

Abstract: A method of performing channel estimation in a multiple-input-multiple-output (MIMO) communication system comprising a downlink device and an uplink device arranged to communicate over a communication channel, the method including at the uplink device: analyzing a first channel vector representing channel gains between the downlink device and a first antenna of the uplink device in the angular domain to identify a set of angular domain support points; generating from the set of angular domain support points a value vector; and feeding back from the uplink device to the downlink device an indication of the value vector; and at the downlink device: analyzing a second channel vector representing channel gains between the downlink device and a second antenna of the uplink device; generating a transmit steering matrix; and generating an estimate of the first channel vector.

Abstract: A method of performing channel estimation in a multiple-input-multiple-output (MIMO) communication system comprising a downlink device and an uplink device arranged to communicate over a communication channel, the method including at the uplink device: analyzing a first channel vector representing channel gains between the downlink device and a first antenna of the uplink device in the angular domain to identify a set of angular domain support points; generating from the set of angular domain support points a value vector; and feeding back from the uplink device to the downlink device an indication of the value vector; and at the downlink device: analyzing a second channel vector representing channel gains between the downlink device and a second antenna of the uplink device; generating a transmit steering matrix; and generating an estimate of the first channel vector.

Abstract: According to the present disclosure there is provided a multiple-input-multiple-output (MIMO) transmitter for transmitting wireless communication signals over a communication channel to a receiver, the transmitter including a digital signal processor configured to perform pre-coding on a plurality Ns of data streams; a plurality NRF of radio-frequency (RF) chains each configured to pass a pre-coded data stream from the digital signal processor to generate a signal representing that data stream; a lens antenna array comprising an array of NT antenna elements; and a selecting unit coupled between the plurality NRF of RF chains and the lens antenna array, the selecting unit including a plurality of separate coupling units each configured to couple a respective RF chain to a selective sub-array of NTBRF antenna elements concurrently for transmitting the signal representing the data stream passed through that RF chain.