Doppler-delay codebook-based precoding and csi reporting for wireless communications systems

Abstract

A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration comprising a number of antenna ports, and downlink signals comprising the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel,the downlink reference signals provided over a certain observation time, selects, based on a performance metric, a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, one or more delay components of the composite Doppler-delay-beam three-stage precoder, and one or more Doppler-frequency components of the composite Doppler-delay-beamthree-stage precoder, calculates either one or more of a channel quality indicator, CQI, and / or a precoder matrix indicator, PMI, and / or a rank indicator, Rl, using the explicit CSI and the compositeDoppler-delay-beam three-stage precoder with the selected Doppler-delay-beam precoder matrix (l W ), and reports to the transmitter the CSI feedback including either one or more of the CQI, and / or thePMI and / or the Rl, wherein the PMI and Rl are used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports.

Description

technical field [0001] The present application relates to the field of wireless communication, and more particularly, to a wireless communication system employing precoding using Doppler delay codebook-based precoding and channel state information (CSI) reporting. Background technique [0002] figure 1 is a schematic diagram of an example of a terrestrial wireless network 100 comprising a core network 102 and a radio access network 104 . The radio access network 104 may include multiple base stations gNB 1 to gNB 5 , each base station is served by the corresponding cell 106 1 to 106 5 A certain area around a base station is schematically shown. A base station is provided to serve users within a cell. The term base station (BS) refers to a gNB in ​​5G networks, an eNB in ​​UMTS / LTE / LTE-A / LTE-A Pro, or simply a BS in other mobile communication standards. Users can be stationary or mobile. In addition, wireless communication systems can be accessed through mobile or fix...

AI Technical Summary

Problems solved by technology

[0034] Although CSI-RS design can be used to obtain CSI for link adaptation (modulation and coding scheme - MCS) and for selecting a precoding matrix from a specific channel realization / snapshot, it cannot track channel evolution in time to estimate MIMO Doppler frequency components of the channel

Images