CQI Offset Reporting for Multiple BLER Targets in Wireless Links

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in reporting channel quality indicators (CQI) for multiple target block error rates (BLERs), leading to increased overhead and suboptimal resource allocation.

Innovation Solution

Reporting one CQI value as an absolute value and one or more other CQI values as relative values based on an absolute value, using offsets to reduce the number of bits required for reporting, thereby optimizing CQI reporting for different traffic channels or bearers with varying tolerable failure rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple CQI values for different BLER targets are reported using absolute values, then measurement precision is improved, but information overhead increases

Engineering Contradiction:

ImproveCQI reporting precisionVSAvoidCQI reporting overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent uses one CQI value as a reference (base) and derives other CQI values through differential offsets, rather than transmitting each CQI value independently. This copying approach reduces the number of bits required while preserving the precision of multiple CQI reports for different BLER targets

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent changes the representation parameter of CQI values from absolute to differential relative to a base value. By reporting the difference (offset) from a reference CQI rather than absolute values, the system reduces reporting overhead while maintaining the ability to accurately represent multiple CQI values for different BLER targets

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If CQI values are reported with full precision for each BLER target, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

ImproveCQI measurement accuracyVSAvoidCQI processing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the CQI reporting into a base CQI value and differential offsets for different BLER targets. This segmentation allows the device to process and report CQI information in a structured manner, reducing computational complexity while maintaining measurement precision through the differential encoding approach

Inventive Principle:

Principle #1Segmentation

3Loss of information

If relative CQI reporting with offsets is used, then information overhead is reduced, but measurement precision may deteriorate

Engineering Contradiction:

ImproveCQI reporting overheadVSAvoidCQI value accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent copies the base CQI value and applies differential offsets to derive other CQI values. This copying mechanism preserves measurement precision because the offsets accurately represent the differences between CQI values for different BLER targets, while using fewer bits than reporting absolute values

Inventive Principle:

Principle #26Copying

Data Source

PatentEP3874633B1Techniques for reporting channel quality indicators in wireless communications

Publication Date: 2026.02.18 QUALCOMM INC

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AI summary

Aspects described herein relate to determining, for a received channel, a first channel quality indicator (CQI) related to a first block error rate (BLER), determining, for the received channel, a second CQI related to a second BLER different from the first BLER, and reporting the first CQI as an absolute value and the second CQI as a relative value from the absolute value.