Dynamic PRG Sizing for QR Decomposition in Wireless Precoding

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently applying QR decomposition due to its high non-linearity and complexity, especially when combined with decimation techniques, leading to catastrophic degradation and error floors.

Innovation Solution

Implementing dynamic precoding resource block group (PRG) sizes for QR decomposition, allowing for dynamic PRG size configurations and calculations, which can be adjusted via downlink control information, to reduce complexity and improve performance by enabling dynamic decimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If QR decomposition is applied with fixed PRG size, then processing can be simplified, but performance degrades due to inability to adapt to varying channel conditions

Engineering Contradiction:

Improveprocessing complexityVSAvoidcommunication reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies dynamics by transitioning from a fixed PRG size to a dynamic PRG size that can be adjusted based on channel conditions. The network node determines the PRG size dynamically and signals it to the UE, allowing the system to adapt to varying channel conditions while managing processing complexity at each endpoint.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If dynamic PRG size is implemented, then adaptability to channel conditions improves, but processing complexity increases at the UE

Engineering Contradiction:

Improvechannel adaptabilityVSAvoidUE processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the complexity of dynamic PRG size determination from the UE by having the network node perform this function. The network node calculates and signals the appropriate PRG size to the UE, thereby removing the most complex processing task from the UE while still enabling adaptive performance.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If QR decomposition with decimation is used, then processing speed improves, but error floors appear due to catastrophic degradation

Engineering Contradiction:

Improveprocessing speedVSAvoiddecoding reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the PRG size parameter to optimize the balance between processing speed and reliability. By changing the PRG size based on channel conditions, the system can achieve faster processing when conditions permit while maintaining reliability through more conservative sizes when needed, avoiding the error floors associated with fixed decimation approaches.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250365747A1Dynamic precoding resource block group size for QR decomposition

Publication Date: 2025.11.27 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a dynamic precoding resource block group (PRG) size UE capability. The UE may receive, in accordance with the dynamic PRG size UE capability, a dynamic PRG size configuration. The UE may receive, in accordance with the dynamic PRG size configuration, an indication of a dynamic PRG size of a PRG that contains a plurality of resource elements (REs) associated with a common Q matrix derived from a QR decomposition. The UE may receive data using the dynamic PRG size. Numerous other aspects are described.