Small Cell Channel Judgment for LAA Wi-Fi Coexistence
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Solution Overview
Problem
The coexistence of Licensed Assisted Access (LAA) and Wi-Fi systems in unlicensed 5 GHz frequency bands leads to serious inter-cell interference and system performance deterioration due to simultaneous data transmission by adjacent small cells, especially in ultra-dense networks deployed in licensed frequency spectra.
Innovation Solution
A judgment method and device that clusters small cells based on geographic position, performs clear channel assessment, calculates interference values, and filters cells into active and restrained sets based on priority and location information to manage data transmission, reducing interference and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all small cells perform clear channel assessment periodically and synchronously, then channel detection efficiency is improved, but inter-cell interference increases due to simultaneous data transmission
Solution Approach 1:
The patent segments small cells into different sets (first set, second set, third set) based on geographic position and interference relationships. This segmentation allows different transmission strategies to be applied to different groups, reducing simultaneous transmissions and thereby reducing inter-cell interference while maintaining channel detection efficiency through coordinated operations within each segment.
Solution Approach 2:
The patent implements dynamic transmission control by adjusting transmission states of small cells based on real-time interference conditions and priority information. Small cells in the third set are dynamically restricted from transmitting during channel occupation periods, while small cells in the first and second sets can transmit. This dynamic adjustment reduces inter-cell interference while maintaining overall system productivity.
2Quantity of substance
If ultra-dense networks are deployed in licensed frequency spectrum, then network capacity is improved, but system performance deteriorates due to serious interference between adjacent cells
Solution Approach 1:
The patent applies local quality by differentiating transmission permissions based on local interference conditions. Small cells are evaluated individually based on their geographic position and interference relationships with neighboring cells. Those causing significant interference are placed in restricted sets, while others are allowed to transmit. This localized differentiation enables ultra-dense deployment while maintaining system performance by preventing interference hotspots.
3Adaptability or versatility
If LAA and Wi-Fi coexist in unlicensed 5 GHz frequency bands, then spectrum utilization is improved, but collision probability increases leading to serious interference
Solution Approach 1:
The patent performs preliminary actions by pre-evaluating interference relationships and priority information before data transmission. Small cells are classified into different sets based on predicted interference conditions. By preparing transmission control decisions in advance based on geographic position and interference analysis, the system reduces collision probability when LAA and Wi-Fi systems coexist, while maintaining efficient spectrum utilization through coordinated transmissions.
Data Source
AI summary
A judgment method of channel occupancy is provided, the method includes: filtering small cells satisfying conditions into a first set according to geographical positions of the small cells and a clear channel detection result; filtering small cells satisfying another conditions into a second set according to interference between small cells, or dividing into a third set; dividing the small cells in the second set into an active set and a restrained set according to priorities and the geographical positions of the small cells; sending transmission control signaling to small cells in the third set, the active set and the restrained set. By utilizing the present disclosure, reasonability of allocation of channel resources can be improved when interior of a small cell system, a Licensed Assisted Access (LAA) system and a Wi-Fi system are coexisted, and system performance can be improved.