Sub-band Selection for Carrier Aggregation Intermodulation
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Solution Overview
Problem
Carrier aggregation in wireless communication links can lead to intermodulation distortion due to overlapping intermodulation products with data channels, which negatively affects data transmission, especially when these products exceed a power threshold.
Innovation Solution
Selecting a first and second sub-band for an access node and determining if their intermodulation product overlaps with a carrier band, scheduling data transmission only when the intermodulation product's power does not meet a threshold, and reallocating sub-bands to different sectors based on power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If carrier aggregation is used to expand bandwidth, then transmission bandwidth is increased, but intermodulation distortion occurs which negatively affects data transmission
Solution Approach 1:
The patent segments the carrier band into multiple sub-bands and selectively aggregates only those sub-bands that do not produce harmful intermodulation products. This allows bandwidth expansion while avoiding the harmful effects of intermodulation distortion by dividing the frequency spectrum into manageable segments that can be safely combined.
Solution Approach 2:
The patent performs preliminary analysis to identify and exclude sub-bands that would create intermodulation products overlapping with data channels before aggregation. By pre-screening sub-band combinations and calculating potential intermodulation products, the system prevents harmful interactions from occurring in the first place, rather than trying to mitigate them after aggregation.
2Productivity
If multiple sub-bands are aggregated to increase data rate, then transmission capacity is improved, but intermodulation products may overlap with data channels causing interference
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the aggregation configuration and calculates intermodulation products. Based on this feedback, the system dynamically adjusts which sub-bands are aggregated, ensuring that high data rates are maintained while transmission quality is preserved by avoiding harmful intermodulation overlaps.
Solution Approach 2:
The patent changes the aggregation parameters by selectively choosing which sub-bands to combine based on their frequency characteristics and potential intermodulation products. By adjusting the aggregation configuration parameters (which specific sub-bands are combined), the system optimizes both data rate and transmission quality, avoiding fixed aggregation schemes that might cause interference.
3Object-affected harmful factors
If sub-bands are reallocated to different sectors based on power levels, then intermodulation distortion is minimized, but system complexity increases
Solution Approach 1:
The patent applies local quality by allocating different sub-bands to different sectors based on their specific power levels and intermodulation characteristics. Each sector receives a tailored sub-band configuration optimized for its local conditions, minimizing intermodulation distortion at each sector level while maintaining overall system efficiency.
Data Source
AI summary
In systems and methods of selecting a sub-band, a first sub-band and a second sub-band of an access node are selected, and is it determined that an intermodulation product of the first sub-band and the second sub-band overlaps with a carrier band of the access node. A transmission of data is scheduled on the second sub-band when a power of the intermodulation product of the first sub-band and the second sub-band does not meet a power threshold.