SL-PRS Power Control for V2X Interference Reduction
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Solution Overview
Problem
Existing power control schemes for sidelink positioning reference signals (SL-PRS) in vehicle-to-everything (V2X) communication systems are not fully effective, leading to unsatisfactory power control and interference with other sidelink and air interface transmissions.
Innovation Solution
A power control method that determines the minimum transmission power among a plurality of powers, including the maximum transmission power of a terminal device and a first transmission power based on path loss, to transmit the SL-PRS, thereby reducing interference with other links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing power control schemes are used for SL-PRS transmission, then transmission power can be maintained at acceptable levels, but interference with other sidelink and air interface transmissions cannot be effectively reduced
Solution Approach 1:
The patent dynamically adjusts the SL-PRS transmission power by changing the power parameter based on measured interference levels and path loss conditions. The transmission power is set to the minimum of multiple calculated power values, allowing the system to adaptively optimize power levels to reduce interference while maintaining positioning reliability.
2Reliability
If transmission power is increased to ensure positioning measurement reliability, then positioning accuracy is improved, but interference with other sidelink and air interface transmissions increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device measures path loss and monitors interference levels, then uses this feedback information to adjust the SL-PRS transmission power. The power control formula incorporates measured path loss and interference conditions, creating a closed-loop system that continuously optimizes power levels based on actual channel conditions.
Solution Approach 2:
The transmission power parameter is dynamically changed based on measured path loss and interference conditions. The system calculates multiple power values using different formulas and selects the minimum, allowing flexible adaptation to varying channel conditions while preventing excessive interference.
3Ease of manufacture
If power control is simplified to ease of implementation, then device complexity is reduced, but effectiveness of power control and interference reduction is compromised
Solution Approach 1:
The patent segments the power control process into distinct calculation steps: calculating first power based on path loss, calculating second power based on interference conditions, and selecting the minimum of these values. This segmentation makes the complex power control algorithm more manageable and implementable while maintaining its effectiveness in reducing interference.
Data Source
AI summary
The present disclosure provides a power control method, an apparatus and a terminal device, and is related to the technical field of communication. The method includes: transmitting SL-PRS according to a transmission power of the SL-PRS, where the transmission power of the SL-PRS is a minimum among a plurality of powers, and the plurality of powers include a maximum transmission power of the first terminal device and a first transmission power, and the first transmission power is a transmission power determined based on a path loss. The method realizes power control of the SL-PRS and can effectively reduce interference to other links.