Adaptive Quantization for Channel Tracking Reference Signals

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR, face challenges in optimizing power consumption and reducing complexity in devices supporting extended reality (XR) communication, which requires efficient channel estimation and equalization.

Innovation Solution

The proposed solution involves a method where a wireless device receives quantization scheme parameters from a user equipment (UE) and measures a downlink reference signal to report quantized sampling information. This information is used by the UE to perform equalization, thereby shifting the complexity from the wireless device to the UE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wireless device performs channel estimation and equalization locally, then communication reliability is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improvecommunication reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the channel estimation and equalization functions from the wireless device and relocates them to the network side (gNodeB). The wireless device only performs simplified reference signal reception and quantized feedback, while the network side performs the complex equalization processing. This extraction resolves the contradiction by maintaining communication reliability through network-side equalization while significantly reducing device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces quantized channel state information as an intermediary mechanism. The wireless device measures the downlink reference signal and provides quantized feedback to the network side, which then uses this information for equalization. This intermediary approach allows the wireless device to maintain minimal complexity while still enabling reliable communication through network-side processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the wireless device performs channel estimation and equalization locally, then communication reliability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidmodem power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts the power-intensive equalization processing from the wireless device and relocates it to the network side. The wireless device only performs low-power reference signal reception and quantized feedback, while the network side performs the computationally intensive equalization. This extraction resolves the power consumption contradiction by maintaining communication reliability through network-side processing while significantly reducing device power usage.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the wireless device performs channel estimation and equalization locally, then communication reliability is improved, but device weight increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoiddevice weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent extracts the heavy computational components required for equalization from the wireless device and relocates them to the network side. This extraction reduces the processing units, memory, and associated hardware components needed in the wireless device, thereby reducing device weight while maintaining communication reliability through network-side equalization.

Inventive Principle:

Principle #2Taking out (Extraction)

4Device complexity

If quantization scheme parameters are used for reference signal measurement, then device complexity is reduced, but measurement precision may be compromised

Engineering Contradiction:

Improvedevice complexityVSAvoidmeasurement precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by using quantization scheme parameters to represent channel state information. Instead of transmitting full-precision measurement data, the system uses quantized representations with controlled precision levels. This approach reduces device complexity by simplifying processing requirements while maintaining sufficient measurement precision for effective equalization through adaptive quantization parameters.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250081208A1Adaptive quantization procedures for channel tracking reference signals to support transmission pre-equalization-based systems

Publication Date: 2025.03.06 QUALCOMM INC

AI summary

A wireless device receives control signaling from a user equipment (UE) indicating one or more quantization scheme parameters. The wireless device measures a downlink reference signal from the UE based on the one or more quantization scheme parameters and reports, to the UE, quantized sampling information based on measurement of the downlink reference signal from the UE. The wireless device receives one or more equalized data transmissions from the UE after providing the quantized sampling information to the UE.