AGC Initialization Using Prior Signal Measurements for Fast Acquisition

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Solution Overview

Problem

Existing wireless communication systems face challenges in optimizing automatic gain control (AGC) initialization due to misaligned default values, leading to signal degradation, increased acquisition delays, and data transfer errors, particularly during initial network node acquisition and handover processes.

Innovation Solution

Deriving an AGC initialization configuration based on a prior measurement metric to configure an AGC feedback loop, mitigating signal degradation by setting appropriate gain values for amplifiers like the low noise amplifier (LNA).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If default AGC initialization values are used, then device complexity is reduced, but signal degradation occurs and acquisition delays increase

Engineering Contradiction:

ImproveAGC initialization complexityVSAvoidsignal quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system performs preliminary measurement of signal power levels before AGC initialization and stores these measurements. When AGC initialization is needed, the previously stored measurement values are retrieved and used to pre-configure appropriate gain values, eliminating the need for complex real-time measurements during initialization while ensuring reliable signal quality.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If default AGC initialization values are used, then ease of operation is improved, but acquisition delays increase

Engineering Contradiction:

ImproveAGC configuration easeVSAvoidacquisition delay

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

Signal power level measurements are performed and stored in advance during normal operation. When AGC initialization is required, the system quickly retrieves the pre-stored measurement values and applies them to set gain parameters, avoiding time-consuming real-time measurements during the initialization process itself.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system creates a copy of previously measured signal power level data and reuses it for AGC initialization. Instead of performing new measurements during initialization, the system copies and applies historical measurement data that reflects actual signal conditions, significantly reducing acquisition time.

Inventive Principle:

Principle #26Copying

3Measurement precision

If real-time measurements are performed during AGC initialization, then measurement precision is improved, but acquisition delays increase

Engineering Contradiction:

Improvesignal power measurement accuracyVSAvoidinitialization time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Accurate signal power level measurements are performed and stored during normal operation when the system has adequate time and resources. During AGC initialization, these pre-acquired precise measurements are retrieved and applied directly, achieving both measurement precision and fast initialization without performing measurements in real-time during the critical initialization phase.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260019965A1Automatic gain control initialization using a prior measurement metric

Publication Date: 2026.01.15 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may derive an automatic gain control (AGC) initialization configuration based at least in part on a prior measurement metric. The UE may configure an AGC feedback loop using the AGC initialization configuration. Numerous other aspects are described.