V2X Terminal Path Loss Estimation via Received Power Feedback
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Solution Overview
Problem
In the context of NR-V2X communication, existing power control methods are inadequate as they fail to accurately determine the path loss between terminal devices, leading to inaccurate transmit power control and reduced performance.
Innovation Solution
A power control method and apparatus that involves a first terminal device sending a signal to a second terminal device, receiving information about the received power, and determining an estimated path loss based on the transmit and received powers. This method allows for accurate determination of path loss and improved power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing power control methods are used in NR-V2X communication, then the system can operate with simpler procedures, but the path loss determination accuracy deteriorates leading to inaccurate transmit power control
Solution Approach 1:
The patent implements a feedback mechanism where the second terminal device measures the received power of the first signal and feeds back this measurement to the first terminal device. The first terminal device then uses this feedback information to calculate the path loss between the two terminal devices, significantly improving path loss determination accuracy compared to existing methods that rely on network device measurements.
Solution Approach 2:
The patent introduces the received power measurement as an intermediary parameter to bridge the gap between transmit power and path loss determination. By using the measured received power at the second terminal device as an intermediary, the system can accurately derive path loss without requiring complex network device involvement in every measurement cycle.
2Reliability
If path loss is estimated based on network device measurements, then the measurement procedure is simplified, but the accuracy deteriorates in V2X scenarios where terminal devices are the actual communicators
Solution Approach 1:
The patent enables terminal devices to perform self-service in power control by having the second terminal device autonomously measure the received power of the first signal and provide this measurement to the first terminal device. This self-service approach improves reliability in V2X scenarios where terminal devices are the actual communicators, while maintaining operational simplicity through automated measurements and calculations.
Solution Approach 2:
The patent inverts the traditional measurement approach by having the receiving terminal device (second terminal) perform the measurement instead of the transmitting terminal or network device. This inversion allows the actual receiver to provide the measurement data, ensuring that the path loss calculation is based on real reception conditions rather than network device estimates.
Data Source
AI summary
This application provides a power control method and a power control apparatus. The method includes: sending, by a first terminal device, a first signal to a second terminal device at a first transmit power; receiving, by the first terminal device, first information from the second terminal device, where the first information is used to indicate or includes a first received power, and the first received power is a received power of the first signal; determining, by the first terminal device, an estimated value of a path loss between the first terminal device and the second terminal device based on the first transmit power and the first received power. According to this application, power control can be properly performed. This application may be applied to an internet of vehicles, for example, V2X, LTE-V, and V2V, or may be applied to fields such as D2D, intelligent driving, and intelligent connected vehicles.