CQI Table Selection in Sidelink via MCS Indication

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Solution Overview

Problem

Existing wireless communication systems lack efficient mechanisms for determining and applying different Channel Quality Index (CQI) tables for aperiodic CSI reports in sidelink communication, particularly in unicast links between UEs, leading to suboptimal resource utilization.

Innovation Solution

A UE determines a CQI table for an aperiodic CSI report based on an indicated Modulation and Coding Scheme (MCS) table in sidelink control information, enabling different CQI tables to be applied for different CSI reports even with a single CSI report configuration, thereby optimizing resource use without explicit signaling of the CQI table.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single CQI table is configured per resource pool, then device complexity is reduced, but adaptability deteriorates as different CSI reports cannot use different CQI tables

Engineering Contradiction:

ImproveCQI table selection flexibilityVSAvoidCQI table configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The receiving device autonomously determines the appropriate CQI table based on the MCS table indicated in the SCI, without requiring explicit CQI table configuration from the transmitting device. This self-determination mechanism enables different CQI tables for different CSI reports while avoiding additional signaling overhead and configuration complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent changes the parameter association by linking CQI table selection to the MCS table indication rather than using separate CQI table configuration. By changing how parameters are associated (CQI table ← MCS table instead of independent CQI table configuration), the system achieves flexible CQI table selection without increasing device complexity

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If explicit signaling of CQI table is implemented, then adaptability improves, but signaling overhead increases

Engineering Contradiction:

ImproveCQI table indication capabilityVSAvoidSignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent merges the CQI table indication function with the existing MCS table indication in the SCI. By combining these two functions into a single indication mechanism, the system achieves CQI table adaptability without adding separate signaling elements, thus avoiding increased signaling overhead

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The MCS table indication in the SCI serves a dual purpose: it indicates both the MCS table and the associated CQI table. This multi-functionality approach allows the single indication to accomplish two tasks, providing CQI table adaptability while maintaining efficient signaling without additional overhead

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4154444B1CQI table selection in sidelink

Publication Date: 2025.06.25 QUALCOMM INC

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AI summary

A wireless device receives a first set of control information indicating a modulation and coding scheme (MCS) table and receives a second set of control information triggering a channel state information (CSI) report. The wireless device transmits the CSI report including CQI that is based on a channel quality indicator (CQI) table associated with the MCS table indicated in the first set of control information.