Sidelink Reference Signal Power Stabilization for V2X Channel Measurement
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Solution Overview
Problem
To maintain accurate sidelink (SL) measurement in wireless communication systems, particularly in Vehicle-to-Everything (V2X) scenarios, there is a need for ensuring the consistent transmission of reference signals (RS) by User Equipments (UEs) to guarantee the accuracy of SL channel state measurement, which is currently hindered by variations in transmit power and frequency of RS transmission.
Innovation Solution
A method where a first device transmits a reference signal for sidelink channel state measurement to a second device, maintaining the same transmit power of the reference signal during a specific time period, and receives the measured SL channel state from the second device, ensuring consistent RS transmission power and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a UE transmits reference signals periodically for SL measurement, then measurement coverage is improved, but transmit power consumption increases and measurement accuracy deteriorates due to power variations
Solution Approach 1:
The patent implements periodic reference signal transmission at predetermined intervals during the measurement period. This periodic action ensures that the reference signal is transmitted at regular time intervals, maintaining consistent transmit power while providing sufficient measurement opportunities for accurate SL channel state measurement.
Solution Approach 2:
The patent employs feedback mechanisms where the receiving UE provides HARQ feedback and measurement results back to the transmitting UE. This feedback loop allows the transmitting UE to adjust and maintain consistent transmit power levels while ensuring accurate measurements are obtained, resolving the contradiction between coverage and precision.
2Measurement precision
If reference signal transmission frequency is increased to improve measurement accuracy, then measurement precision is improved, but power consumption and system overhead increase
Solution Approach 1:
The patent applies partial action by transmitting reference signals only at necessary periodic intervals rather than continuously. This approach provides sufficient measurement accuracy for SL channel state estimation while avoiding excessive power consumption and system overhead associated with continuous high-frequency transmission.
Solution Approach 2:
The patent changes the transmission parameter by maintaining consistent power levels for reference signals throughout the measurement period. This parameter stabilization ensures measurement accuracy without requiring increased transmission frequency or power, thereby controlling energy consumption.
3Reliability
If reference signal transmit power is increased to improve measurement reliability, then measurement reliability is improved, but power consumption increases and may cause interference
Solution Approach 1:
The patent performs preliminary actions by establishing a predetermined measurement period and reference signal transmission schedule before actual measurements begin. This preliminary setup ensures that reference signals are transmitted at consistent, predetermined power levels throughout the measurement period, guaranteeing measurement reliability without requiring dynamic power increases.
Solution Approach 2:
The patent maintains stable transmission power parameters for reference signals throughout the measurement period. By keeping the power parameter constant rather than increasing it, the system achieves reliable measurements through consistent transmission while avoiding the energy loss and potential interference associated with higher power levels.
Data Source
AI summary
Provided are: a method for a first device to perform wireless communication; and a device supporting same. The above method may comprise: a step for transmitting a first reference signal (RS) related to the measurement of a sidelink (SL) channel state to a second device; and a step for receiving, from the second device, the SL channel state between the first device and the second device and measured on the basis of the first RS. Here, for example, the transmission power of the first RS transmitted by the first device may be the same during a specific time period.