CCA Parameter Optimization for Unlicensed Spectrum Access
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Solution Overview
Problem
Current LTE systems face challenges in effectively contending for and utilizing unlicensed frequency spectrum resources, leading to limited channel access opportunities and inefficient frequency reuse, especially when multiple LTE base stations or terminals from the same operator attempt to access these resources.
Innovation Solution
The method involves signaling an extended Clear Channel Assessment (CCA) parameter N to user equipment, allowing them to access the channel only if it remains clear throughout N CCA detection periods, thereby optimizing CCA detection windows and enabling more concurrent channel access opportunities while maintaining a frequency reuse factor of 1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CCA detection window is optimized to allow more concurrent channel access opportunities, then the frequency spectrum utilization efficiency is improved, but the channel access contention and signal interference between multiple LTE base stations or terminals increases
Solution Approach 1:
The patent changes the CCA detection parameter N to allow multiple LTE base stations or terminals to detect the channel as clear simultaneously. By adjusting this parameter, the system enables more concurrent channel access opportunities while maintaining frequency reuse factor of 1, thereby improving spectrum utilization efficiency without causing excessive interference
Solution Approach 2:
The patent dynamically adjusts the CCA detection window configuration to adapt to varying channel conditions and traffic demands. This dynamic optimization allows the system to maximize channel access opportunities while managing interference levels, resolving the contradiction between productivity and harmful factors
2Productivity
If multiple LTE base stations or terminals are allowed to access unlicensed channels concurrently, then the channel access opportunities increase, but the difficulty of detecting and measuring clear channel conditions increases
Solution Approach 1:
The patent modifies the CCA detection parameter N to create a detection mechanism that can handle multiple concurrent access attempts. This parameter adjustment allows the system to maintain clear channel detection accuracy even when multiple base stations or terminals are contending for channel access simultaneously
Solution Approach 2:
The patent performs preliminary CCA detection before channel access to establish clear channel conditions. By conducting this detection in advance with the optimized parameter N, the system can identify suitable channel access opportunities before multiple devices attempt transmission, reducing the difficulty of detecting clear channels in a concurrent access scenario
Data Source
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AI summary
Disclosed are a method and device for preempting transmission resources on unlicensed carriers, so as to implement an improved technical scheme for preempting channel resources on the unlicensed carriers, and thereby achieving a higher spectrum utilization rate. The method for preempting transmission resources on unlicensed carriers provided in the present application comprises: a device determines whether a preset clear channel assessment (CCA) detection time point is reached, said CCA detection time point being reached cyclically, said cycle being shorter than a preset allowed maximum duration of occupation for each signal transmission after the device preempts a channel; the device performs CCA detection when the CCA detection time point is reached.