NR V2X Sidelink Power Control Using Channel-State Feedback
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Solution Overview
Problem
In sidelink (SL) communication, determining efficient transmit power considering the pathloss between transmitting and receiving User Equipments (UEs) is a challenge.
Innovation Solution
A method and device for wireless communication involving a first device that transmits reference signals based on initial transmit power, receives information on channel state, and adjusts transmit power accordingly before re-transmitting the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to compensate for pathloss, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment where the UE continuously monitors channel state information (CSI) and adjusts its transmit power accordingly. The power control mechanism dynamically modifies the reference signal transmit power based on measured pathloss and channel conditions, allowing the system to optimize the balance between communication reliability and energy consumption in real-time
Solution Approach 2:
The patent employs a feedback mechanism where the receiving UE measures channel state information (including pathloss) and feeds this information back to the transmitting UE. The transmitting UE then uses this feedback to adjust its transmit power, creating a closed-loop control system that optimizes energy efficiency while maintaining communication reliability
2Use of energy by moving object
If transmit power is optimized based on channel state, then energy efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service power control where the UE autonomously measures channel state information and independently adjusts its own transmit power without requiring complex network coordination. The UE uses pre-configured power control parameters and autonomously determines optimal transmit power levels based on measured pathloss, reducing the complexity of centralized control while improving energy efficiency
Data Source
AI summary
Provided are a method by which a first device performs wireless communication, and a device for supporting same. The method can comprise the steps of: transmitting one or more reference signals (RSs) to a second device on the basis of first transmit power; receiving, from the second device, information related to a channel state measured on the basis of the one or more RSs; changing the first transmit power to second transmit power on the basis of the information related to the channel state; and transmitting the one or more RSs to the second device on the basis of the second transmit power.