Interlace-Based PSFCH Power Control Using Pathloss Modes
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Solution Overview
Problem
The challenge of determining transmission power for interlace-based physical sidelink feedback channels (PSFCH) in sidelink over unlicensed spectrum (SL-U) systems is not adequately addressed by existing technologies.
Innovation Solution
A method and terminal device are provided to determine the transmission power of interlace-based PSFCH, utilizing a processor to execute a program that calculates power based on downlink pathloss and sidelink pathloss, ensuring compliance with regulatory requirements and efficient channel access in unlicensed spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power control for interlace-based PSFCH is not implemented, then channel access is simple, but transmission power cannot be effectively controlled leading to potential interference and regulatory non-compliance
Solution Approach 1:
The patent applies parameter changes by calculating transmission power based on pathloss values and adjusting power levels according to operational modes (first mode using downlink pathloss, second mode using sidelink pathloss). The power control mechanism dynamically changes transmission power parameters to resolve the contradiction between effective power control and system complexity.
Solution Approach 2:
The patent introduces pathloss as an intermediary parameter to mediate between transmission power and received power requirements. By using pathloss calculations as an intermediate step, the system achieves precise power control without direct complex feedback mechanisms, thus managing the complexity-power control tradeoff.
2Reliability
If transmission power is increased to ensure reliable communication, then communication reliability improves, but interference with other devices on unlicensed spectrum increases
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device calculates pathloss based on reference signals and uses this feedback information to determine appropriate transmission power levels. This feedback loop ensures reliable communication while preventing excessive interference by continuously adjusting power based on actual channel conditions.
Solution Approach 2:
The patent dynamically changes transmission power parameters based on calculated pathloss values and selected operational modes. By adjusting power levels according to actual communication conditions rather than using fixed high power, the system maintains reliability while minimizing harmful interference to other devices on unlicensed spectrum.
3Ease of manufacture
If power control based on downlink pathloss is used, then implementation is simpler, but accuracy in reflecting actual sidelink channel conditions decreases
Solution Approach 1:
The patent introduces dynamic selection between different power control modes (first mode using downlink pathloss, second mode using sidelink pathloss) based on operational conditions. This dynamic approach allows the system to switch between simple implementation and high precision measurement depending on the specific communication scenario, resolving the contradiction between ease of implementation and measurement accuracy.
Solution Approach 2:
The patent changes the pathloss calculation parameter selection based on operational modes. The system can switch between using downlink pathloss (simpler implementation) and sidelink pathloss (more accurate for actual sidelink conditions) by adjusting the operational mode, thus resolving the tradeoff between implementation simplicity and measurement precision.
Data Source
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AI summary
Provided are a method for determining a transmission power, and a terminal device. The method comprises: a terminal device determining a transmission power of a first PSFCH, wherein the first PSFCH is a PSFCH based on a comb-tooth structure.