Sidelink Power Control Under Shared Spectrum Limits
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Solution Overview
Problem
The challenge of performing power control for sidelink signals in unlicensed or shared spectrum, where power limits are imposed, has not been adequately addressed in existing technologies.
Innovation Solution
A power control method for sidelink signals in shared spectrum is developed, considering factors such as power limits, maximum transmit power, sidelink priority, channel busy ratio, downlink path loss, and sidelink path loss to determine optimal transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control is performed for sidelink signals in unlicensed spectrum based on power limits, then compliance with spectrum regulations is improved, but transmit power flexibility and communication reliability deteriorate
Solution Approach 1:
The patent implements dynamic power control by determining transmit power through multiple interconnected factors including power limits, maximum transmit power, sidelink priority, channel busy ratio, and path loss. This dynamic approach allows the system to adapt transmit power in real-time based on current channel conditions and regulatory requirements, resolving the contradiction between compliance and flexibility.
Solution Approach 2:
The patent changes multiple power-related parameters simultaneously (power limit, maximum transmit power, sidelink priority, channel busy ratio, downlink path loss, sidelink path loss) to determine optimal transmit power. By adjusting these parameters dynamically, the system maintains compliance with power limits while preserving adaptability to different transmission scenarios.
2Reliability
If transmit power is increased to overcome path loss, then communication coverage and reliability are improved, but interference to other signals and energy consumption increase
Solution Approach 1:
The patent incorporates feedback mechanisms by considering channel busy ratio and path loss measurements in the power control determination. The system continuously monitors channel conditions and adjusts transmit power accordingly, increasing power only when necessary to maintain coverage while minimizing interference through informed decision-making based on real-time feedback.
Solution Approach 2:
The patent applies partial action by determining transmit power based on the minimum necessary to overcome path loss and maintain communication, rather than always using maximum power. The system calculates required power levels considering power limits and channel conditions, applying only the necessary power increment to achieve coverage while avoiding excessive power that would cause interference.
3Productivity
If power control considers multiple factors (priority, channel busy ratio, path loss), then transmission optimization is improved, but computational complexity and control difficulty increase
Solution Approach 1:
The patent segments the power control determination into distinct components: power limit considerations, maximum transmit power constraints, sidelink priority factors, channel busy ratio assessments, and path loss calculations. By dividing the complex determination process into manageable segments, the system achieves comprehensive optimization while reducing the perceived complexity of control.
Solution Approach 2:
The patent creates a universal power control framework that handles multiple factors (power limits, maximum power, priority, channel busy ratio, downlink path loss, sidelink path loss) through a single integrated determination process. This multi-functional approach optimizes transmission across diverse scenarios using one cohesive control mechanism, improving productivity without proportionally increasing control difficulty.
Data Source
AI summary
Provided are a power control method and terminal devices. The method comprises: a terminal device determining transmit power of a first sidelink signal in shared spectrum based onfollowing information: first transmit power, determined based on a power limit; second transmit power, determined based on a maximum transmit power of the terminal device; and fourth transmit power, determined based on a downlink path loss or the second transmit power.