Wireless Access Node Intermodulation Distortion Scheduling
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Solution Overview
Problem
Wireless communication networks face interference and noise issues due to intermodulation distortion between frequency bands, particularly when damage or flaws occur in RF circuitry, making it difficult for signal processing systems to filter out intermodulation noise effectively.
Innovation Solution
A method for operating a wireless access node that involves exchanging communication signals across multiple frequency bands, detecting signal-to-noise data, scheduling observation periods to determine intermodulation characteristics, and modifying scheduling routines to prevent interference by ensuring one frequency band does not transmit or receive data when the other band is active, thereby limiting intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple frequency bands are used to communicate information over a greater overall frequency band, then the communication capacity and coverage are improved, but intermodulation distortion and noise interference between frequency bands increase
Solution Approach 1:
The system performs preliminary detection of signal-to-noise data and intermodulation characteristics before scheduling communication signals. By detecting intermodulation distortion levels in advance and comparing them against criteria, the system proactively identifies problematic frequency band combinations and adjusts scheduling to prevent severe interference, rather than reacting after interference occurs.
Solution Approach 2:
The system dynamically adjusts the scheduling of communication signals based on real-time detection of signal-to-noise data and intermodulation characteristics. The scheduling is not fixed but adapts to changing channel conditions, allowing the system to optimize the balance between utilizing multiple frequency bands for high capacity and avoiding time slots where intermodulation distortion would be severe.
2Adaptability or versatility
If RF circuitry is used to transmit and receive signals across multiple frequency bands, then wireless communication services are enabled, but damage or flaws in the RF circuitry cause increased intermodulation noise that is difficult to filter
Solution Approach 1:
The system implements a feedback mechanism where signal-to-noise data and intermodulation characteristics are continuously detected and fed back to the scheduling system. This feedback loop allows the system to monitor the actual performance of the RF circuitry across frequency bands and adjust scheduling decisions based on detected interference levels, compensating for RF circuitry flaws by avoiding problematic operating conditions.
3Measurement precision
If observation periods are scheduled to detect intermodulation characteristics, then accurate interference detection is achieved, but communication time is reduced due to periods when no data transmission occurs
Solution Approach 1:
The system performs detection of intermodulation characteristics only partially - specifically during observation periods when communication signals are not being transmitted. By limiting detection to these specific time windows rather than continuously, the system achieves sufficient measurement precision to identify intermodulation issues while minimizing the impact on overall communication time. The detection is excessive in the sense that it focuses intensely on specific parameters during observation periods rather than continuous monitoring.
Data Source
AI summary
Systems, methods, and software described herein provide enhancements for monitoring communication data for multiple applications on a wireless device. In particular, a wireless access node is configured to monitor signal to noise data for a first frequency band from a second frequency band. When the signal to noise data meets noise criteria, the access point schedules observation periods in the first frequency band to determine intermodulation distortion for the first frequency band from the second frequency band. Based on the intermodulation distortion meeting distortion criteria, the access point schedules the second frequency band to transmit data only when the first frequency band is neither transmitting nor receiving data.