Channel reciprocity-based precoding matrix configuration method and apparatus
AssigneeDatang Mobile Communications Equipment Co., Ltd.
InventorsZhengxuan Liu, Qiubin Gao, Hui Li
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Abstract
Disclosed are a channel reciprocity-based precoding matrix configuration method and apparatus. The method includes: in downlink transmission, a network side separately sends, on each antenna port associated with each transmission layer, a CSI-RS subjected to beamforming to a terminal by using beams calculated according to angle information and delay information determined on the basis of uplink channel state information, and determines a precoding matrix for downlink transmission of the terminal according to beams sent on K0 antenna ports selected by the terminal on the basis of the CSI-RS, and a beam combination coefficient set.
Claims20
A channel reciprocity-based precoding matrix determination method, comprising:
- sending, by a network side, a channel state information-reference signal (CSI-RS) subjected to beamforming to a terminal on respective antenna ports associated with respective transmission layers, wherein a beam used while sending the CSI-RS on any one of the antenna ports is obtained according to angle information and delay information determined on the basis of uplink channel state information of the terminal;
- receiving, by the network side, information about K0 antenna ports and a beam combination coefficient set reported by the terminal, wherein the K0 antenna ports are selected by the terminal on the basis of respective received CSI-RSs, the beam combination coefficient set is obtained by calculation on the basis of the CSI-RSs received on the K0 antenna ports, and K0 is an integer greater than zero;
- and
- determining, by the network side, a precoding matrix of downlink transmission of the terminal according to the beams used while sending the CSI-RSs on the K0 antenna ports and the beam combination coefficient set.
A channel reciprocity-based precoding matrix determination method, comprising:
- receiving, by a terminal on respective antenna ports associated with respective transmission layers, a channel state information-reference signal (CSI-RS) subjected to beamforming and sent by a network side, wherein a beam used while receiving the CSI-RS on any one of the antenna ports is obtained according to angle information and delay information determined on the basis of uplink channel state information of the terminal;
- selecting, by the terminal, K0 antenna ports on the basis of respective received CSI-RSs and calculating, by the terminal, a beam combination coefficient set corresponding to the K0 antenna ports on the basis of CSI-RSs received on the K0 antenna ports, wherein K0 is an integer greater than zero;
- and
- reporting, by the terminal, information about the K0 antenna ports and the beam combination coefficient set to the network side, wherein the beams used while sending the CSI-RSs on the K0 antenna ports and the beam combination coefficient set are configured for the network side to determine a precoding matrix of downlink transmission of the terminal.
A terminal, comprising:
- a memory, configured to store executable instructions;
- and
- a processor, configured to read the executable instructions stored in the memory and execute the following operations:
- receiving on respective antenna ports associated with respective transmission layers, a channel state information-reference signal (CSI-RS) subjected to beamforming and sent by a network side, wherein a beam used while receiving the CSI-RS on any one of the antenna ports is obtained according to angle information and delay information determined on the basis of uplink channel state information of the terminal;
- selecting K0 antenna ports on the basis of respective received CSI-RSs and calculating a beam combination coefficient set corresponding to the K0 antenna ports on the basis of CSI-RSs received on the K0 antenna ports, wherein K0 is an integer greater than zero;
- and
- reporting information about the K0 antenna ports and the beam combination coefficient set to the network side, wherein the beams used while sending the CSI-RSs on the K0 antenna ports and the beam combination coefficient set are configured for the network side to determine a precoding matrix of downlink transmission of the terminal.
Dependencies are inferred from the claim text.