Selective Cellular Harmonic Mitigation for GNSS Reception
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Solution Overview
Problem
Harmonic signals generated by cellular transmission frequencies interfere with GNSS reception, degrading the receive signal and causing data loss.
Innovation Solution
Implement a resource block allocation probability engine to determine the likelihood of interference based on location, time, historical data, and signal characteristics, and selectively apply mitigation techniques such as reducing transmitter power, deactivating the GNSS receiver, or using machine-learning filters to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mitigation techniques are always applied to reduce harmonic interference, then GNSS signal reception quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts mitigation techniques based on real-time conditions. The processor determines whether to apply mitigation by evaluating whether the transmitter frequency is a harmonic of the GNSS frequency, and selectively applies power reduction or deactivation only when interference is detected, rather than continuously applying mitigation.
Solution Approach 2:
The system applies partial mitigation by selectively reducing transmitter power or deactivating the transmitter only when and where harmonic interference occurs, rather than applying full mitigation continuously. This partial action is sufficient to resolve the interference problem while minimizing impact on power consumption.
2Object-affected harmful factors
If transmitter power is reduced to minimize harmonic interference, then interference with GNSS reception is reduced, but transmission signal strength decreases
Solution Approach 1:
The system applies different power levels to different transmission scenarios. When the transmitter frequency is determined to be a harmonic of the GNSS frequency, the transmitter power is reduced or transmission is deactivated locally at those specific frequencies. For non-harmonic frequencies, normal transmission power is maintained, ensuring signal strength is preserved where interference is not a concern.
3Object-affected harmful factors
If the GNSS receiver is deactivated to prevent interference, then receive signal quality is improved, but location service availability decreases
Solution Approach 1:
The system periodically evaluates whether to deactivate the GNSS receiver based on whether the transmitter is operating at a harmonic frequency. The processor continuously monitors the frequency relationship and selectively deactivates the GNSS receiver only during periods when harmonic interference is present, allowing location services to remain available during non-interference periods.
Data Source
AI summary
User equipment (UE) may determine a probability that a cellular network may allocate a resource block to the UE having a frequency that, when a cellular transmitter of the UE transmits a radio frequency (RF) signal using the resource block, a harmonic signal may be generated that interferes with a global navigation satellite systems (GNSS) signal received by a GNSS receiver of the UE. The probability may be determined based on a number of factors that may impact resource block allocation, including a location of the UE, a current date and/or time, a historical allocation of resource blocks (which may be crowdsourced), a client type associated with a signal to be transmitted, a signal environment at the UE, real world conditions, and so on. Based on the probability, the UE may selectively perform a mitigation procedure or transmit an RF signal without performing the mitigation procedure.