Methods and apparatuses for enhanced CSI reporting with respect to multiple downlink

Patent metadata

Field	Value
Publication number	US-12425167-B2
Application number	US-202117927522-A
Country	US
Kind code	B2
Filing date	Jun 14, 2021
Priority date	Jun 15, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

The embodiment of the present disclosure relates to methods and apparatuses for enhancing the reporting of the channel state information (CSI) with respect to multiple downlink resources. A method performed by a UE comprises: receiving, from a network node, a CSI report configuration which provides a number N of reference signal resources for channel measurement; performing measurements on said N RS resources; calculating or determining one or more CSI quantities for a number M of selected RS resources; and transmitting, to the network node, a CSI report including the calculated or determined CSI quantities, wherein the CSI report comprises two parts—part 1 and part 2—, and wherein the content contained in part 1 indicates the size of part 2. There is also disclosed a UE, a method performed in a network node and a network node.

First claim

The invention claimed is:

1. A method performed by a user equipment (UE), the method comprising:
receiving, from a network node, a channel state information (CSI) report configuration providing:
N Non Zero Power (NZP) CSI reference signal (CSI-RS) or synchronization signal/physical broadcast channel (SSB) resources associated with one or more NZP CSI-RS or SSB resources sets for channel measurement;
one or more resources for interference measurement wherein the resources for interference measurement are CSI interference management (CSI-IM) resources being Zero-Power CSI-RS resources and/or NZP CSI-RS resources or SSB resources; and
an indication of one or multiple subsets or combinations of the N resources provided for channel measurement in the CSI report configuration;

applying a Quasi-CoLocation typeD (QCL) assumption with respect to a channel measurement resource to measure one or more interference measurement resources associated with the channel measurement resource, wherein the QCL-typeD assumption is defined in the 3GPP specifications; and
providing, to the network node, a CSI report that comprises two parts, part 1 and part 2, and wherein the content contained in part 1 indicates the size of part 2,
wherein the CSI report contains a CSI-RS resource indicator (CRI) or a CRI field indicating selected CSI-RS resources associated with the CSI report, wherein the CRI or CRI field is included in part 1 of the CSI report, and wherein the CRI or CRI field is associated with a number of code-points, wherein each code-point is associated with a combination or a subset of the CSI-RS resources which are configured for channel measurement in the CSI report configuration; and the association of the code-points to combinations of CSI-RS resources is configured via a higher layer or it is a priori known to the UE and fixed in the 3GPP specifications.

2. The method according to claim 1 , wherein the CSI report includes one or more of the following CSI quantities:
a synchronization signal/physical broadcast channel (SSB) resource identifier (SSBRI) indicating a subset or a combination of SSB resources, out of the SSB resources provided in the CSI report configuration, wherein each resource is associated with the one or more CSI quantities in the CSI report;
a rank indicator (RI) indicating a combination of rank values for the subset of CSI-RS resources in the CSI report;
a channel quality indicator (CQI) indicating one or more CQI values for the subset of CSI-RS resources;
a layer indicator (LI) value, and
a precoding matrix indicator (PMI) indicating one or more precoding matrices for the subset of CSI-RS resources.

3. The method according to claim 1 , further comprising, measuring the channel using one or more of said reference signals, and measuring the corresponding interference using said one or more resources from at least one of the following:
a CSI-interference management (IM) resource;
one or more Non Zero Power (NZP) CSI-RS or SSB resources; or
one or more NZP CSI-RS or SSB resources that are configured for interference measurement.

4. The method according to claim 1 , wherein the CSI report configuration is linked to one or more CSI resource settings, wherein the CSI report configuration provides at least one of the following settings:
one or more CSI resource settings, each providing one or more sets of downlink RS resource(s) for channel measurement;
one or more CSI resource settings, each providing one or more sets of CSI-IM resources for interference measurement; and
one or more CSI resource settings, each providing one or more sets of DL RS resources for interference measurement.

5. The method according to claim 4 , wherein the number of CSI resource settings for channel measurements and/or the number of CSI resource settings for interference measurement from CSI-IM resources and/or the number of CSI resource settings for interference measurement from CSI-RS or SSB resources is equal to a number of frequency bands or a number of transmit receive points, TRPs, the resources are associated with.

6. The method according to claim 1 , wherein each CSI quantity is associated with at least one of the M selected RS resources, and wherein the M selected RS resources are indicated in the CSI report.

7. The method according to claim 1 , wherein the number of indicated CSI-RS resources by the CRI determines the payload size of part 2 of the CSI report.

8. The method according to claim 1 , wherein the CSI report includes a bitmap that indicates one or multiple subsets or resource combinations of resources configured for channel measurement and are associated with the CSI quantities in the CSI report.

9. The method according claim 1 , wherein, the CRI or the CRI field is represented by an

⌈

log
2

(

N

M

)

⌉

⁢

or
⁢

⁢

⌈

log
2

(

∑

m
=
1

M

(

N

m

)

)

⌉

⁢

⁢
or
⁢

⁢

⌈

log
2

(

∑

m
=
0

M

(

N

m

)

)

⌉

bit indicator wherein each code-point of the bit indicator is asso

Assignees

• Koninklijke Philips Nv

Inventors

• Grossmann Marcus
• Landmann Markus
• Varatharaajan Sutharshun

Classifications

• H04L5/0057

  Physical resource allocation for CQI · CPC title

• H04L5/0053 Primary

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/005 Primary

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title