Sidelink Power Control for PSFCH Interlaces
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Solution Overview
Problem
Existing wireless communication systems do not effectively account for additional waveform types in sidelink communications, leading to inadequate power control for physical sidelink feedback channel (PSFCH) messages.
Innovation Solution
A method for computing the total common interlace transmit power and the total PSFCH transmit power, based on predetermined percentages of the maximum transmit power capability, pathloss measurements, and the number of resource blocks, to ensure reliable and interference-minimized sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If predetermined power rules are used for PSFCH messages, then power control is simple to implement, but additional waveform types are not accounted for leading to inadequate power control
Solution Approach 1:
The patent implements dynamic power control for PSFCH messages by adjusting transmit power based on the number of resource blocks allocated. The power control mechanism transitions from static predetermined rules to dynamic calculation that adapts to different waveform types and resource allocations, ensuring adequate power control while maintaining implementation feasibility through standardized calculation procedures
Solution Approach 2:
The patent changes the power control parameter from fixed predetermined values to dynamically calculated values based on the number of resource blocks. This parameter change enables the system to account for additional waveform types by scaling power control decisions according to actual resource allocation, thereby improving adaptability without requiring completely new power control frameworks
2Reliability
If transmit power is increased for multiple resource blocks, then channel occupancy bandwidth requirements are met, but interference to other communications increases
Solution Approach 1:
The patent applies parameter changes by adjusting transmit power proportionally to the number of resource blocks allocated. This ensures that channel occupancy bandwidth requirements are met through adequate power levels while preventing excessive interference by scaling power appropriately rather than using fixed high power settings. The power control parameter is modified based on actual resource allocation to balance reliability and interference considerations
Solution Approach 2:
The patent implements feedback-based power control where the transmit power for PSFCH messages is determined by monitoring the number of resource blocks allocated and adjusting power accordingly. This feedback mechanism ensures that power levels are optimized for the actual channel occupancy requirements while preventing excessive interference to other communications by adapting to real-time resource allocation conditions
Data Source
AI summary
Wireless communications systems and methods related to sidelink communication between user equipments (UEs). A first UE determines a power level for a physical sidelink format indicator channel (PSFCH) with multiple interlaced resource blocks (RBs) and/or a common interlace. If a reference power level is provided by a network device such as a base station, the UE may determine power levels based on the reference power level. The UE may also determine power levels based on maximum supported power levels for the UE. In some embodiments, a common interlace uses a fixed percentage of maximum UE power. In other embodiments, available transmit power is evenly split between PSFCH RBs and a common interlace. Priority PSFCH dropping rules may be implemented when scheduled PSFCHs exceed power limitations.