Patent ID: 11901979
Assignee: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. 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.