US 11,901,979 B2
Channel reciprocity-based precoding matrix configuration method and apparatus
Zhengxuan Liu, Beijing (CN); Qiubin Gao, Beijing (CN); and Hui Li, Beijing (CN)
Assigned to DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD., Beijing (CN)
Appl. No. 17/785,399
Filed by DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD., Beijing (CN)
PCT Filed Dec. 7, 2020, PCT No. PCT/CN2020/134269
§ 371(c)(1), (2) Date Jun. 15, 2022,
PCT Pub. No. WO2021/135837, PCT Pub. Date Jul. 8, 2021.
Claims priority of application No. 201911404709.7 (CN), filed on Dec. 30, 2019.
Prior Publication US 2023/0009991 A1, Jan. 12, 2023
Int. Cl. H04B 7/04 (2017.01); H04B 7/0456 (2017.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01)
CPC H04B 7/0456 (2013.01) [H04B 7/063 (2013.01); H04B 7/0617 (2013.01); H04B 7/0626 (2013.01); H04B 7/0632 (2013.01); H04L 5/0048 (2013.01)] 20 Claims
OG exemplary drawing
 
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.