Dynamic RF Band Allocation With Tunable Filters for Self-Desense
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Solution Overview
Problem
The RF spectrum allocation faces challenges due to political changes in frequency band allocation across regions and geographic areas, leading to interference issues like intermodulation distortion and receiver sensitivity degradation, particularly in user equipment (UE) communication systems.
Innovation Solution
Implement tunable filters that adjust passbands based on time and location to accommodate changing frequency allocations, and mitigate intermodulation distortion by optimizing modulation orders of uplink bands to reduce self-desense in downlink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed frequency bands are allocated for RF transmission, then regulatory compliance is maintained, but the system cannot adapt to changing political allocations and geographic regions
Solution Approach 1:
The patent implements dynamic filter tuning capability that allows the RF front-end to automatically adjust passband frequencies based on detected location and current regulatory allocations. The filter transitions from a static fixed configuration to a dynamic adaptive system that can reconfigure in real-time to match local frequency band assignments, resolving the contradiction between adaptability and complexity through automated control.
Solution Approach 2:
The system incorporates feedback mechanisms where the device detects its geographic location, queries current frequency band allocations for that region, and uses this information to automatically reconfigure the filter passbands. This closed-loop feedback approach enables the system to adapt to regulatory changes without manual intervention, maintaining compliance while simplifying the user experience despite increased underlying complexity.
2Adaptability or versatility
If multiple frequency bands are used for uplink transmission, then communication flexibility is improved, but intermodulation distortion and receiver sensitivity degradation occur
Solution Approach 1:
The patent identifies and exploits the relationship between uplink and downlink frequency bands to convert the harmful intermodulation effect into a useful filtering capability. By designing the downlink filter passband to specifically exclude frequencies that would generate intermodulation products from active uplink bands, the system transforms the intermodulation problem into a basis for intelligent frequency selection and filter configuration, thereby maintaining multi-band flexibility while eliminating distortion.
Solution Approach 2:
The system performs preliminary analysis of potential uplink band combinations and their resulting intermodulation products before actual transmission begins. By pre-calculating which downlink bands would be affected by intermodulation from selected uplink bands, the system can proactively configure filters to prevent distortion before it occurs, rather than reacting to degradation after it happens.
3Productivity
If frequency bands are dynamically adjusted based on location and time, then spectral efficiency is improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent implements a self-service band allocation system where the device autonomously determines its location, queries frequency band availability for its current time and location, and automatically configures its filters without external intervention. This self-service approach enables dynamic spectral optimization while minimizing the complexity burden on users and network infrastructure, as the device handles all adjustments independently based on publicly available regulatory information.
Data Source
AI summary
Methods and systems for frequency band allocation are provided. A tunable/selectable passband filter is disclosed that changes based on the time and location of the user equipment. Additionally, a method of allocating and optimizing upload and download bands is provided to mitigate inter-modulation distortion due to intermodular distortion effects from strong uplink channels.