Sidelink CSI Reporting With CSI-RS Identification Feedback

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Solution Overview

Problem

In sidelink communication systems, there is a lack of a one-to-one relationship between CSI feedback triggers and CSI reporting, leading to ambiguity in identifying the associated CSI feedback, which affects communication accuracy.

Innovation Solution

Incorporating additional information in the CSI report to identify the CSI-RS, such as system frame number, slot index, absolute time, or HARQ process identifier, to enable the triggering device to accurately determine the basis of the CSI report.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple CSI feedback triggers are transmitted in different time slots, then the ability to trigger CSI feedback is improved, but the ability to identify the associated reported CSI deteriorates

Engineering Contradiction:

ImproveCSI feedback triggering capabilityVSAvoidCSI association identification

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent applies feedback by having the reporting device send back association information in the CSI report that identifies which CSI-RS the report is based on. This feedback loop allows the triggering device to correctly match received CSI reports with the corresponding CSI-RS transmissions, resolving the identification problem when multiple triggers are sent.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary element - the association information (such as time slot index, frame number, or sequence number) - that mediates between the CSI-RS transmission and the CSI report. This intermediary carries the identification data needed to link the report back to its corresponding trigger and reference signal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If CSI report includes additional identification information, then the accuracy of CSI-RS identification is improved, but the complexity of the reporting structure increases

Engineering Contradiction:

ImproveCSI-RS identification accuracyVSAvoidCSI report structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the identification information into distinct fields within the CSI report structure. Instead of using a single complex identifier, the association information is divided into separate elements (such as time slot index, frame number, or sequence number fields) that can be independently processed and matched, reducing overall complexity while maintaining precision.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4055731B1CSI report including information identifying CSI-rs

Publication Date: 2026.02.25 QUALCOMM INC

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AI summary

A method, a computer-readable medium, and an apparatus for wireless communication at a first user equipment (UE). A channel state information (CSI) report trigger can be received from a second UE, and a channel state information reference signal (CSI-RS) can be received from the second UE in a same slot as the CSI report trigger. A CSI report can be transmitted to the second UE based on the CSI-RS, the CSI report including information identifying the CSI-RS on which the CSI report is based. The UE that triggered the CSI report can determine the CSI-RS on which the CSI report is based using the information included in the CSI report.