Sidelink Power Control Using PC-5 Path Loss for V2X Interference
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Solution Overview
Problem
Current LTE V2X systems are limited to broadcast transmission and face inefficiencies in power management when two devices are close, leading to power waste and interference concerns, particularly due to path loss measurements based on Uu interface, which do not account for PC-5 interface specifics.
Innovation Solution
A method for wireless communication that involves receiving reference signals, determining transmitting power based on measurements specific to the PC-5 interface, and adjusting power levels to ensure effective unicast transmission without interfering with Uu interface, while also considering beam-specific gains for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmitting power is determined based on Uu interface path loss to avoid interference with cellular uplink, then interference to Uu interface is reduced, but terminal power is wasted when two terminals are close in distance
Solution Approach 1:
The patent applies local quality by using different path loss measurement methods for different interfaces: Uu interface path loss measurement for determining maximum transmitting power to protect cellular uplink, and PC-5 interface path loss measurement for determining actual transmitting power for sidelink efficiency. This localized adaptation of measurement quality resolves the contradiction between interference protection and power efficiency.
Solution Approach 2:
The patent introduces dynamic power determination by allowing the terminal to adjust transmitting power based on real-time PC-5 interface path loss measurements while being constrained by the maximum power derived from Uu interface measurements. This dynamic adjustment mechanism enables the system to adapt to varying sidelink conditions without compromising cellular uplink protection.
2Object-affected harmful factors
If transmitting power is determined based on Uu interface path loss to ensure cellular uplink protection, then Uu interface interference is avoided, but transmission accuracy on PC-5 interface deteriorates
Solution Approach 1:
The patent segments the power determination process into two independent stages: first determining maximum transmitting power based on Uu interface path loss for interference protection, then determining actual transmitting power based on PC-5 interface path loss for transmission accuracy. This segmentation allows each stage to optimize for its specific goal without compromising the other.
Solution Approach 2:
The patent implements dynamic power control by enabling the terminal to adjust actual transmitting power based on PC-5 interface conditions within the maximum power limit. This dynamic adjustment ensures transmission accuracy on the sidelink while maintaining protection for the cellular uplink.
3Reliability
If multiple beams are used between base station and terminal for improved coverage, then transmission reliability is enhanced, but existing power determination method becomes inadequate
Solution Approach 1:
The patent applies local quality by associating different maximum power values with different uplink receiving beams. Each beam has its own path loss measurement and corresponding maximum power determination, allowing the system to optimize power control for each beam's specific characteristics while managing the complexity through structured organization.
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.