V2X UE Sidelink Transmission Power Control via Pathloss Estimation
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Solution Overview
Problem
Current 5G communication systems face challenges in supporting high reliability and high data rates for vehicle-to-everything (V2X) communications, particularly in estimating and controlling sidelink pathloss to ensure effective transmission power management between terminals.
Innovation Solution
A method and apparatus for configuring sidelink transmission power in V2X user equipment (UE) by receiving parameters from a base station, estimating pathloss, and adjusting transmission power based on sidelink and downlink pathloss to optimize sidelink control and data channel transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve V2X communication reliability, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on pathloss conditions. The terminal calculates pathloss using reference signal received power and reference signal received quality, then adapts transmission power accordingly - using higher power only when pathloss exceeds a threshold, and lower power when conditions are good, thus improving reliability only when necessary while conserving energy during normal operation.
2Measurement precision
If pathloss estimation accuracy is improved to optimize transmission power, then transmission efficiency is improved, but measurement complexity increases
Solution Approach 1:
The patent uses downlink reference signals as an intermediary to estimate uplink pathloss. Instead of directly measuring uplink channel conditions, the terminal uses the downlink reference signal received quality (RSRQ) and received power (RSRP) as proxies to infer pathloss conditions, simplifying the measurement process while maintaining accuracy through the reciprocity of wireless channels.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal continuously monitors downlink reference signal quality and adjusts transmission power based on the calculated pathloss. The system compares measured RSRQ against thresholds and dynamically adjusts power levels, creating a closed-loop control system that maintains accuracy while adapting to changing channel conditions.
Data Source
AI summary
A method and apparatus are provided. The method of configuring a sidelink transmission power by a V2X user equipment (UE) in a wireless communication system includes receiving, from a base station (BS), first parameter for sidelink link quality or second parameter for downlink link quality, configuring, the transmission power for at least one of a sidelink control channel or a sidelink data channel based on sidelink pathloss or downlink pathloss according to the receiving of the first parameter or the second parameter, and transmitting, to a receiving V2X UE, the sidelink control channel or the sidelink data channel based on the configured transmission power.