Adaptive Power Control for GNSS Interference Mitigation
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Solution Overview
Problem
Modern computing devices integrating multiple radio access technology (RAT) transmitters face interference challenges that degrade Global Navigation Satellite System (GNSS) operations, particularly with the integration of advanced wireless technologies like 5G and Ultra-Wide Band, making interference mitigation increasingly difficult.
Innovation Solution
An adaptive wireless transmitter power control system that asserts power back-off requests for RAT transmitters based on satellite signal quality, reducing interference during GNSS operations by determining the appropriate power levels for each transmitter, especially during tracking and acquisition states, and deasserting requests when signal quality meets thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple RAT transmitters are integrated in the same device, then device functionality and wireless technology capabilities are improved, but GNSS signal quality and operation reliability deteriorate due to radio interference
Solution Approach 1:
The patent implements dynamic power control of RAT transmitters based on real-time GNSS signal quality monitoring. The system adjusts transmitter power levels adaptively - reducing power when GNSS signals are weak or during critical acquisition/tracking periods, and allowing higher power when GNSS operations are not active or signal quality is sufficient. This dynamic adjustment resolves the contradiction by making the system flexible rather than static.
Solution Approach 2:
The patent establishes a feedback loop where GNSS signal quality is continuously monitored and used to control RAT transmitter power. The GNSS receiver provides feedback about signal quality metrics (such as carrier-to-noise ratio, signal strength) to the power control mechanism, which then adjusts transmitter power accordingly. This closed-loop feedback system ensures GNSS reliability while maintaining RAT functionality.
2Measurement precision
If power back-off requests are asserted for RAT transmitters, then GNSS signal quality is improved, but RAT transmitter power and communication capability are reduced
Solution Approach 1:
The patent applies partial power back-off rather than complete power reduction. Instead of disabling RAT transmitters entirely during GNSS operations, the system applies selective and proportional power reduction - only enough to mitigate interference while maintaining adequate RAT communication capability. This partial action approach balances GNSS signal quality requirements with RAT performance needs.
Solution Approach 2:
The patent implements periodic or intermittent power back-off based on GNSS operational phases. Power reduction is applied during critical periods such as satellite signal acquisition and tracking, but may be relaxed or removed during idle periods or when GNSS signal quality is already sufficient. This periodic application of power back-off reduces overall impact on RAT performance while protecting GNSS operations when needed.
3Object-affected harmful factors
If adaptive power control is implemented, then GNSS interference mitigation is improved, but system complexity and control mechanisms increase
Solution Approach 1:
The patent implements a universal power control mechanism that serves multiple functions: it protects GNSS operations, maintains RAT communication performance, and adapts to different operational scenarios. The same power control system handles various GNSS constellations, multiple RAT types (cellular, Wi-Fi, Bluetooth), and different signal quality conditions, reducing the need for separate specialized control circuits for each scenario.
Data Source
AI summary
This document describes techniques, apparatuses, and systems for adaptive wireless transmitter power control for GNSS interference mitigation. This document addresses interference degradation in GNSS operations of computing devices due to integration of a variety of radio interference aggressors in the same platform. A GNSS subsystem is disclosed that may assert power back-off requests to reduce the power of one or more RAT transmitters and limit signal degradation during GNSS subsystem operations. Qualities of the satellite signals received at the GNSS subsystem may be analyzed to determine if it is appropriate to assert or deassert the power back-off requests. In this way, the described techniques, apparatuses, and systems for adaptive wireless transmitter power control for GNSS subsystems may adaptively manage GNSS subsystem operations and other RATs to reduce GNSS signal degradation due to interference.