Sidelink Path Loss Estimation for 5G V2X Reliability
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Solution Overview
Problem
Existing 5G communication systems face challenges in estimating inter-terminal sidelink path loss accurately, which affects the reliability and data rate of sidelink communications, particularly in vehicle-to-everything (V2X) scenarios.
Innovation Solution
A method and apparatus for estimating inter-terminal sidelink path loss by transmitting a signal for path loss estimation between terminals, measuring reference signal received power (RSRP), and configuring transmission power based on the path loss estimation result, thereby enhancing the reliability and data rate of sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If path loss estimation is performed using existing methods in 5G communication systems, then communication between terminals can be established, but the path loss estimation accuracy is insufficient, leading to unreliable sidelink communications
Solution Approach 1:
The invention performs path loss estimation before actual data transmission by having the receiving terminal measure the reference signal received power (RSRP) of a previously transmitted reference signal. This preliminary measurement allows the transmitting terminal to configure appropriate transmission power in advance, ensuring reliable sidelink communication from the start rather than attempting transmission and then adjusting.
Solution Approach 2:
The invention implements a feedback mechanism where the receiving terminal measures RSRP and reports the measured value back to the transmitting terminal. The transmitting terminal uses this feedback information to accurately estimate path loss and configure transmission power. This closed-loop feedback process significantly improves path loss estimation accuracy compared to open-loop methods.
2Productivity
If transmission power is not accurately configured based on precise path loss estimation, then device complexity is reduced, but the data rate of sidelink communications deteriorates
Solution Approach 1:
The feedback mechanism allows the system to achieve accurate path loss estimation and optimal transmission power configuration without complex algorithms. The receiving terminal simply measures and reports RSRP, and the transmitting terminal uses this feedback to calculate path loss and set transmission power, achieving high data rates through a relatively simple procedure.
Solution Approach 2:
The receiving terminal performs the measurement and reporting functions autonomously based on pre-configured parameters, and the transmitting terminal autonomously configures transmission power based on the received feedback. This self-service approach eliminates the need for complex centralized control while achieving optimal performance.
3Reliability
If transmission power is increased to improve communication reliability, then sidelink communication reliability improves, but interference to other terminals increases
Solution Approach 1:
The invention dynamically adjusts transmission power parameters based on actual path loss conditions estimated through RSRP measurement and feedback. Instead of using fixed or excessively high transmission power, the system configures power levels that precisely match the channel conditions, achieving reliable communication at the minimum necessary power level, thereby reducing interference to other terminals.
Data Source
AI summary
The present disclosure relates to a method and apparatus for estimating inter-terminal sidelink path loss for control information and data information transmission between terminals. A path loss estimation method of a transmission terminal in a wireless communication system according to an embodiment may include transmitting a signal for path loss estimation to a reception terminal, receiving a path loss estimation result report from the reception terminal in response to the signal for path loss estimation, configuring a transmission power based on the path loss estimation result report, and performing a sidelink transmission with the reception terminal with the configured transmission power.