Wireless Node Sidelink Power Control with Uu-Based Interference Limits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LTE V2X systems face inefficiencies in power management due to broadcast-only transmission and reliance on Uu interface path loss for sidelink power determination, leading to wasted terminal power when devices are close and multiple beams are involved, necessitating a redesign for unicast and groupcast transmissions.
Innovation Solution
A method involving the reception of reference signals to determine a maximum power for sidelink transmissions, using Uu interface measurements as an upper limit to prevent interference while ensuring correct reception on the PC-5 interface, with beam-specific power control and feedback mechanisms to optimize transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmitting power on sidelink is determined according to path loss between Uu interfaces, then interference to cellular uplink transmission is avoided, but terminal power is wasted when terminals are close in distance
Solution Approach 1:
The patent applies local quality by using different path loss measurement approaches for different scenarios: Uu interface path loss for distant terminals to prevent interference, and PC5 interface path loss for close terminals to save power. The system selectively applies different quality metrics based on the local communication context.
Solution Approach 2:
The patent changes the parameter used for power determination from fixed Uu interface path loss to a dynamic selection between Uu and PC5 interface path loss based on terminal distance. This parameter change enables adaptive power control that optimizes both interference avoidance and energy efficiency.
2Device complexity
If broadcast transmission mode is used in LTE V2X, then system simplicity is maintained, but unicast and groupcast transmission requirements cannot be met
Solution Approach 1:
The patent introduces dynamic transmission mode selection capability, allowing the system to switch between broadcast, unicast, and groupcast modes based on service requirements. This dynamic adaptation maintains system simplicity for broadcast while enabling specialized modes when needed, resolving the contradiction between simplicity and versatility.
3Reliability
If multiple beams are involved in V2X communication, then coverage and reliability are improved, but existing power determination methods become inadequate
Solution Approach 1:
The patent segments the power control problem by associating each beam with its own path loss measurement and power determination. Instead of a single power level for all beams, the system calculates and controls power independently for each beam based on its specific channel conditions, enabling reliable multi-beam operation without excessive complexity.
Data Source
AI summary
The disclosure provides a method and device used for node in wireless communication. The first node first receives a first reference signal and a second reference signal, then determines a first power within a range not greater than a first maximum power, and finally transmits a first radio signal with the first power; wherein the first maximum power is related to a measurement result against the first reference signal and is not related to a measurement result against the second reference signal. Through determining an upper limit of a transmitting power on a sidelink using a measurement result against a cellular network link, the disclosure can reduce interferences to the cellular network while ensuring the sidelink performance, and can optimize the transmitting power on the sidelink to reduce the power consumption of the terminal, thereby improving the overall performance of the system.