Three-component codebook based CSI reporting

Patent metadata

Field	Value
Publication number	US-11936456-B2
Application number	US-202017634371-A
Country	US
Kind code	B2
Filing date	Aug 5, 2020
Priority date	Aug 15, 2019
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A method performed by a UE for providing CSI feedback in the form of CSI reports in a wireless communication system includes receiving, from a gNB, higher layer configurations of one or more downlink reference signals, and CSI report configurations associated with the downlink reference signal configurations, and a radio signal including the downlink reference signals according to the one or more downlink reference signal configurations, the downlink reference signals provided over a configured number of frequency domain resources, time domain resources and one or more ports; determining, for each CSI report, a precoding matrix based on the downlink reference signals and two codebooks, and one or more non-zero combining coefficients for complex combining of one or more spatial domain and delay domain basis vectors; and reporting to the network node the CSI reports for the CSI report configurations.

First claim

The invention claimed is:

1. A method performed by a user equipment (UE) for providing channel state information (CSI) feedback in a form of one or more CSI reports in a wireless communication system (A), the method comprising:
receiving, from a network node (gNB) higher layer configuration(s) of one or more downlink reference signals, and one or more CSI report configuration(s) associated with the downlink reference signal configuration(s), and a radio signal, the radio signal including the downlink reference signal(s) according to the one or more downlink reference signal configuration(s),
the downlink reference signal(s) being provided over a configured number of frequency domain resources, time domain resources and one or more ports;
determining, for each CSI report, a precoding matrix based on the downlink reference signal(s) and two codebooks, the two codebooks including
a spatial codebook comprising one or more spatial domain (SD) basis components of a precoder, and
a delay codebook comprising one or more delay domain (DD) basis components of the precoder,

and one or more non-zero combining coefficients for complex combining of the one or more SD and DD basis vectors; and
reporting, to the network node, the one or more CSI reports for the one or more CSI report configurations,

wherein each CSI report contains a selected precoding matrix in the form of a precoding matrix identifier (PMI) and a rank identifier (RI) indicating the transmission rank for the RI layers of the precoding matrix, and wherein each CSI report comprises two parts: CSI part 1 and CSI part 2, wherein part 1 has a fixed payload size and comprises information indicating the size of the payload of part 2, wherein part 2 comprises at least the amplitude and phase information of the selected non-zero combining coefficients of the CSI report, and wherein a portion, or the entirety, of part 2 is available for omission from the CSI report, wherein CSI part 1 contains at least the information on the selected number of non-zero combining coefficients across all RI layers and an indication of the transmission rank for the RI layers of the selected precoding matrix.

2. The method of claim 1 , wherein CSI part 2 of the N REP CSI reports is segmented into TN REP +1 CSI subgroups, where TN REP is a total number of CSI subgroups associated with the N REP CSI reports, wherein T CSI subgroups are associated with a single CSI report, and one CSI subgroup contains information associated with all N REP CSI reports, and wherein each CSI subgroup is associated with a priority (priority level).

3. The method of claim 2 , wherein the CSI subgroup that contains information associated with all N REP CSI reports has the highest priority (priority level 0), and the remaining TN REP CSI subgroups are associated with the lower priority levels 1 to TN REP , and wherein the last CSI subgroup TN REP is associated with the lowest priority level TN REP .

4. The method of claim 2 wherein each CSI subgroup with the highest priority associated with a single CSI report contains at least the fraction of the bitmaps and the information of the combining coefficients associated with the DD basis vector index of the SCI for the RI layers.

5. A method performed by a network node (gNB) for receiving channel state information (CSI) feedback in a form of one or more CSI reports in a wireless communication system (A), the method comprising:
sending, to a user equipment (UE) higher layer configuration(s) of one or more downlink reference signals, and one or more CSI report configuration(s) associated with the downlink reference signal configuration(s), and a radio signal, the radio signal including the downlink reference signal(s) according to the one or more downlink reference signal configuration(s); and
receiving, from the UE one or more CSI reports for one or more CSI report configurations, wherein each CSI reports comprises:
a precoding matrix determined based on the downlink reference signal(s) and two codebooks, the two codebooks including:
a spatial codebook comprising one or more spatial domain (SD) basis components of a precoder, and
a delay codebook comprising one or more delay domain (DD) basis components of the precoder,

and one or more non-zero combining coefficients for complex combining of the one or more SD and DD basis vectors,

wherein each CSI report contains a selected precoding matrix in the form of a precoding matrix identifier (PMI) and a rank identifier (RI) indicating the transmission rank for the RI layers of the precoding matrix, and wherein each CSI report comprises two parts: CSI part 1 and CSI part 2, wherein part 1 has a fixed payload size and comprises information indicating the size of the payload of part 2, wherein part 2 comprises at least the amplitude and phase information of the selected non-zero combining coefficients of the CSI report, and wherein a portion, or the entirety, of part 2 is available for omission from the CSI, wherein CSI part 1 contains at least the information on the selected number of non-zero combining coefficients across all RI layers and an indication of the transmission rank for the RI layers of the selected precoding matrix.

6. A user equipment (UE) comprising a processor and a memory, the memory containing computer program code executable by the processor whereby the UE is operative to:
receive, from a network node (gNB) higher layer configuration(s) of one or more downlink reference signals, and one or more CSI report configuration(s) associated with the downlink reference signal configuration(s), and a radio signal, the radio signal including the downlink reference signal(s) according to the one or more downlink reference signal configuration(s),
the downlink reference signal(s) being provided over a configured number of frequency domain resources, time domain resources and one or more ports;
determine, for each CSI report, a precoding matrix based on the downlink reference signal(s) and two codebooks, the two codebooks including
a spatial codebook comprising one or more spatial domain (SD) basis components of a precoder, and
a delay codebook comprising one or more delay domain (DD) basis components of the precoder,

and one or more non-zero combining coefficients for complex combining of the one or more SD and DD basis vectors; and
report, to the network node, the one or more CSI reports for the one or more CSI report configurations,

wherein each CSI report contains a selected precoding matrix in a form of a precoding matrix identifier (PMI) and a rank identifier (RI) indicating the transmission rank for the RI layers of the precoding matrix, and wherein each CSI report comprises two parts: CSI part 1 and CSI part 2, wherein part 1 has a fixed payload size and comprises information indicating the size of the payload of part 2, wherein part 2 comprises at least the amplitude and phase information of the selected non-zero combining coefficients of the CSI report, and wherein a portion, or the entirety, of part 2 is available for omission from the CSI, wherein CSI part 1 contains at least the information on the selected number of non-zero combining coefficients across all RI layers and an indication of the transmission rank for the RI layers of the selected precoding matrix.

7. A network node comprising a processor and a memory, the memory containing computer program code executable by the processor whereby the network node is operative to:
send, to a user equipment (UE) higher layer configuration(s) of one or more downlink reference signals, and one or more CSI report configuration(s) associated with the downlink reference signal configuration(s), and a radio signal, the radio signal including the downlink reference signal(s) according to the one o

Assignees

• Fraunhofer Ges Forschung

Inventors

• Grossmann Marcus
• Venkatesh Ramireddy
• Landmann Markus

Classifications

• G06T2207/10028

  Range image; Depth image; 3D point clouds · CPC title

• H04N23/695

  Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects · CPC title

• G06V10/761

  Proximity, similarity or dissimilarity measures · CPC title

• H04N13/128

  Adjusting depth or disparity · CPC title

• G06T7/55

  from multiple images · CPC title