# US 2025/0159518 A1 · Type ii csi reporting for cjt with angle and delay reciprocity

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- Number: US 2025/0159518 A1
- Document ID: US20250159518A1
- Status: Published application
- Kind: A1
- Application number: 18/685,944
- Filed: 2022-08-23
- Published: 2025-05-15
- Earliest claimed: 2021-08-23
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Siva Muruganathan; Fredrik Athley; Shiwei Gao; Andreas Nilsson; Xinlin Zhang
- Web page: https://patentgrep.com/patent/US20250159518A1

## CPC

- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04B 7/0481: {using subset selection of codebooks}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0062: {Avoidance of ingress interference, e.g. ham radio channels}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

Systems and methods are disclosed herein for Channel State Information (CSI) reporting with angle and delay reciprocity. Embodiments of a User Equipment (UE) and a method of operation thereof are disclosed. Embodiments of network node and a method of operation thereof are also disclosed.

## Claims

### Claim at position 1

1-38. (canceled)

### Claim 39

A method performed by a User Equipment (UE), the method comprising the following steps:
receiving, from a network node, information for a Channel State Information (CSI) reporting configuration that configures the UE with:
multiple Non-Zero Power (NZP) CSI Reference Signal (CSI-RS) resources for channel measurement associated with the CSI reporting configuration, where each of the multiple NZP CSI-RS resources is associated with a different Transmission Configuration Indicator (TCI) state or unified TCI state; and
a parameter combination indicating at least a total number of Frequency Domain (FD) basis vectors to be selected across the multiple NZP CSI-RS resources or a plurality of sets of CSI-RS ports;
performing channel measurement on:
the configured multiple NZP CSI-RS resources according to the respective TCI state or unified TCI state;
receiving, from the network node, information that configures the UE with one or more FD basis vector windows that are over all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement;
receiving, from the network node, information that configures the UE with a number of FD basis vectors to be selected, where the number of FD basis vectors to be selected is common to all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement;
computing CSI based on the channel measurements and in accordance with the received information that configures the UE with the one or more frequency domain basis vector windows and the information that configures the UE with the number of FD basis vectors to be selected; and
reporting the computed CSI.

### Claim 40 (depends on 39)

The method of claim 39, wherein:
the UE is configured with multiple(S) NZP CSI-RS resources for channel measurement; and
the one or more frequency domain basis vector windows comprise a single FD basis window that is applicable for all S configured NZP CSI-RS resources.

### Claim 41 (depends on 40)

The method of claim 40, wherein the information that configures the UE with the single FD basis window comprises an index (M_init) of a starting FD basis vector in the single FD basis window and a window size N, where N is a number of consecutive FD basis vectors in the single FD basis window.

### Claim 42 (depends on 41)

The method of claim 41, wherein the starting FD basis vector index for the single FD basis window is predefined.

### Claim 43 (depends on 40)

The method of claim 40, wherein a common subset of FD basis vectors is selected for all S configured NZP CSI-RS resources from the single FD basis window.

### Claim 44 (depends on 43)

The method of claim 43, wherein the UE reports the selected common subset of FD basis vectors as part of the CSI via a combinatorial coefficient index.

### Claim 45 (depends on 43)

The method of claim 43, wherein the UE performs further down-selection among the selected common subset of FD basis vectors and the further down-selected FD basis vectors are reported in the CSI via a non-zero coefficient bitmap.

### Claim 46 (depends on 39)

The method of claim 39, wherein for each of the multiple(S) configured NZP CSI-RS resources, the corresponding selected FD basis vectors are phase rotated such that a zero-th FD basis vector is always selected, wherein the rotated phase is reported as part of the CSI.

### Claim 47

A User Equipment (UE) comprising
one or more transmitters;
one or more receivers; and
processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry configured to cause the UE to perform one or more of the following:
receiving, from a network node, information for a Channel State Information (CSI) reporting configuration that configures the UE with:
multiple Non-Zero Power (NZP) CSI Reference Signal (CSI-RS) resources for channel measurement associated with a CSI reporting configuration, where each of the multiple NZP CSI-RS resources is associated with a different Transmission Configuration Indicator (TCI) state or unified TCI state; and
a parameter combination indicating at least a total number of Frequency Domain (FD) basis vectors to be selected across the multiple NZP CSI-RS resources or a plurality of sets of CSI-RS ports;
performing channel measurement on:
the configured multiple NZP CSI-RS resources according to the respective TCI state or unified TCI state;
receiving, from the network node, information that configures the UE with one or more FD basis vector windows that are over all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement;
receiving, from the network node, information that configures the UE with a number of FD basis vectors to be selected, where the number of FD basis vectors to be selected is common to all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement;
computing CSI based on the channel measurements and in accordance with the received information that configures the UE with the one or more FD basis vector windows and the information that configures the UE with the number of FD basis vectors to be selected; and
reporting the computed CSI.

### Claim 48 (depends on 47)

The UE of claim 47, wherein:
the UE is configured with multiple(S) NZP CSI-RS resources for channel measurement; and
the one or more FD basis vector windows comprise a single FD basis window that is applicable for all S configured NZP CSI-RS resources.

### Claim 49 (depends on 48)

The UE of claim 48, wherein the information that configures the UE with the single FD basis window comprises an index (M_init) of a starting FD basis vector in the single FD basis window and a window size N, where N is a number of consecutive FD basis vectors in the single FD basis window.

### Claim 50 (depends on 49)

The UE of claim 49, wherein the starting FD basis vector index for the single FD basis window is predefined.

### Claim 51 (depends on 48)

The UE of claim 48, wherein a common subset of FD basis vectors is selected for all S configured NZP CSI-RS resources from the single FD basis window.

### Claim 52 (depends on 51)

The UE of claim 51, wherein the UE reports the selected common subset of FD basis vectors as part of the CSI via a combinatorial coefficient index.

### Claim 53 (depends on 51)

The UE of claim 51, wherein the UE performs further down-selection among the selected common subset of FD basis vectors and the further down-selected FD basis vectors are reported in the CSI via a non-zero coefficient bitmap.

### Claim 54 (depends on 47)

The UE of claim 47, wherein for each of the multiple(S) configured NZP CSI-RS resources, the corresponding selected FD basis vectors are phase rotated such that a zero-th FD basis vector is always selected, wherein the rotated phase is reported as part of the CSI.

### Claim 55

A method performed by a network node, the method comprising one or more of the following steps:
transmitting, to a User Equipment (UE), information that configures the UE with:
multiple Non-Zero Power (NZP) Channel State Information (CSI) Reference Signal (CSI-RS) resources for channel measurement associated with a CSI reporting configuration, where each of the multiple NZP CSI-RS resources is associated with a different Transmission Configuration Indicator (TCI) state or unified TCI state;
transmitting, to the UE, information that configures the UE with one or more Frequency Domain (FD) basis vector windows that are:
over all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement;
transmitting, to the UE, information that configures the UE with a number of FD basis vectors to be selected, where the number of FD basis vectors to be selected is:
common to all configured NZP CSI-RS resources, in the case of configuration of multiple NZP CSI-RS resources for channel measurement; and
receiving, from the UE, CSI in accordance with the transmitted information that configures the UE with the one or more FD basis vector windows and the transmitted information that configures the UE with the number of FD basis vectors to be selected.