Adaptive CCA Thresholds for Unlicensed Wireless Channel Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in performing clear channel assessment (CCA) on unlicensed bands with inefficiencies and imprecision, particularly in licensed-assisted access (LAA) scenarios.
Innovation Solution
Adaptive configuration of the maximum energy detection threshold for CCA based on the bandwidth and transmit power of the carrier to enhance precision and efficiency in various wireless channel environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed CCA threshold is used for channel access on unlicensed bands, then the implementation is simple, but the precision and efficiency of channel access deteriorates in varying wireless channel environments
Solution Approach 1:
The patent applies dynamics by making the CCA threshold adaptive rather than fixed. The threshold is dynamically adjusted based on transmit power level and carrier bandwidth, allowing the system to adapt to varying channel conditions and improve CCA precision without excessive complexity
Solution Approach 2:
The patent changes the parameter of CCA threshold based on other parameters (transmit power and bandwidth). By establishing a relationship where the threshold varies with these parameters, the system achieves better measurement precision while maintaining reasonable implementation complexity through formula-based calculation
2Measurement precision
If the CCA threshold is configured adaptively based on bandwidth and transmit power, then the CCA precision is improved, but the system complexity increases
Solution Approach 1:
The patent manages complexity by systematically defining parameter relationships through formulas. The CCA threshold is determined by changing parameters (power and bandwidth) according to established mathematical relationships, which improves precision while keeping the implementation methodical and manageable
Solution Approach 2:
The patent incorporates feedback mechanisms where the system monitors transmit power and bandwidth conditions, then adjusts the CCA threshold accordingly. This feedback loop enables adaptive precision while maintaining structured system operation through defined adjustment rules
3Productivity
If the CCA threshold is adjusted according to transmit power and bandwidth, then the channel access efficiency is improved, but the calculation and configuration complexity increases
Solution Approach 1:
The patent improves channel access efficiency by systematically changing the CCA threshold parameter based on transmit power and bandwidth. The formula-based approach provides a clear calculation method that balances improved efficiency with manageable computational requirements
Solution Approach 2:
The patent applies preliminary action by pre-establishing the relationship formulas between CCA threshold, transmit power, and bandwidth. This allows the system to efficiently determine thresholds without complex real-time calculations, improving channel access speed while maintaining reasonable configuration complexity
Data Source
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AI summary
A method for performing channel access in an unlicensed band by a base station in a wireless communication system according to an embodiment of the present invention may comprise the steps of: sensing, in an unlicensed band, a carrier for transmitting a downlink signal; and transmitting the downlink signal when power detected by sensing the carrier is less than an energy detection threshold set by the base station, wherein the energy detection threshold is set to be equal to or less than a maximum energy detection threshold determined by the base station, and when another radio access technology (RAT) sharing the carrier exists, the maximum energy detection threshold is adaptively determined depending on the bandwidth size of the carrier, using the value, in decibels, of the ration between a reference bandwidth and the bandwidth of the carrier.