PSFCH Format Selection Based on Pathloss in 5G V2X
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Solution Overview
Problem
The existing Physical Sidelink Feedback Channel (PSFCH) format in 5G V2X communication systems is limited by interference, leading to insufficient transmission power, which affects the detection performance of Hybrid Automatic Repeat Request (HARQ) feedback, necessitating a more efficient format selection based on pathlosses to improve communication efficiency.
Innovation Solution
A method that determines the appropriate PSFCH format by considering pathlosses from the PSFCH transmitter to both the base station and the receiver, allowing for the selection between short and long formats based on calculated values to optimize time-domain resource usage and transmission power, thereby enhancing the probability of correct reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSFCH format 0 with single symbol is used, then transmission power is limited by interference to base station, but detection performance of HARQ feedback is insufficient
Solution Approach 1:
The patent implements dynamic selection between PSFCH format 0 (single symbol) and PSFCH format 1 (multiple symbols) based on real-time pathloss conditions. When pathloss exceeds a threshold, the system switches to format 1 to increase transmission power and improve detection performance, resolving the contradiction between power limitations and reliability requirements.
Solution Approach 2:
The patent changes the time-domain parameter (number of symbols) of the PSFCH format based on pathloss conditions. By adjusting this parameter dynamically, the system can increase transmission power when needed while maintaining interference management, thus improving HARQ feedback detection performance without permanently increasing power consumption.
2Reliability
If PSFCH format occupying multiple symbols is introduced, then detection performance is improved, but transmission power consumption increases
Solution Approach 1:
The system dynamically adjusts the PSFCH format based on pathloss conditions, using format 1 (multiple symbols) only when necessary (when pathloss exceeds threshold) and format 0 (single symbol) when conditions allow. This dynamic approach improves detection performance when needed while minimizing energy consumption during normal operations.
Solution Approach 2:
The patent changes the time-domain parameter (number of symbols) based on pathloss measurements. This parameter change allows the system to increase transmission power consumption only when pathloss conditions require it, rather than continuously consuming higher power, thus balancing reliability improvement with energy efficiency.
3Productivity
If pathloss-based format selection is implemented, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary pathloss measurement and comparison against a threshold before selecting the PSFCH format. This preliminary action allows the system to make informed format selection decisions based on current channel conditions, improving communication efficiency while keeping the decision logic relatively simple through threshold-based comparison.
Solution Approach 2:
The patent implements a feedback mechanism where pathloss measurements are continuously monitored and used to adjust PSFCH format selection. This feedback loop enables the system to adapt to changing channel conditions, improving communication efficiency while maintaining manageable complexity through established feedback control principles.
Data Source
AI summary
The present disclosure provides a method and device in a node for wireless communications. A first receiver receives a first signal and a second signal; a first transmitter transmits a third signal in a first radio resource pool; wherein the first signal is used for determining first information, the first information being related to channel quality between the first node and a transmitter of the first signal; the second signal is used for determining second information, the second information being related to channel quality between a transmitter of the second signal and the first node; the transmitter of the first signal is different from the transmitter of the second signal; and the first information and the second information are used together for determining a magnitude of time-domain resources occupied by the third signal.