V2X Sidelink Synchronization with GNSS Reliability Checks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle-to-everything (V2X) communication systems face challenges in synchronization control due to higher user equipment density and velocity, leading to resource occupancy and interference issues, particularly when coexisting with device-to-device (D2D) synchronization signals.
Innovation Solution
Wireless terminals in V2X communication systems are configured to check synchronization reliability factors such as signal strength and velocity before acting as synchronization sources, using processors to compare these factors against thresholds to determine appropriate synchronization signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless terminals in V2X communication systems transmit synchronization signals without checking synchronization reliability factors, then the synchronization process is simpler and faster, but synchronization reliability deteriorates and interference increases due to higher UE density and velocity
Solution Approach 1:
The patent applies preliminary action by requiring wireless terminals to check synchronization reliability factors (signal strength, velocity) before transmitting synchronization signals. This pre-check mechanism ensures that only reliable terminals act as synchronization sources, improving synchronization reliability while preventing interference in high-density V2X scenarios.
Solution Approach 2:
The patent changes the state of synchronization signal transmission by introducing dynamic parameter checks (signal strength thresholds, velocity thresholds). Terminals adjust their synchronization source status based on these parameter changes, ensuring reliable transmission only when conditions are favorable, thus resolving the contradiction between reliability and operational simplicity.
2Reliability
If wireless terminals transmit synchronization signals without checking velocity, then the transmission process is simpler, but synchronization reliability deteriorates due to Doppler shift effects from high vehicle velocity
Solution Approach 1:
The patent introduces velocity as a critical parameter for determining synchronization source status. By monitoring velocity changes and comparing against predefined thresholds, the system ensures that only terminals with acceptable velocity (minimal Doppler shift) transmit synchronization signals, maintaining reliability while automating the complexity.
Solution Approach 2:
The patent implements feedback mechanisms where terminals continuously monitor their velocity and signal strength, and adjust their synchronization transmission behavior accordingly. This closed-loop control ensures reliable synchronization while automatically managing the operational complexity through adaptive decision-making.
3Reliability
If wireless terminals act as synchronization sources without checking signal strength, then the system is more decentralized and robust, but interference increases and resource occupancy becomes excessive due to high UE density
Solution Approach 1:
The patent introduces signal strength (RSRP) as a threshold-based parameter for determining synchronization source status. By requiring terminals to check whether received signal strength exceeds a predefined threshold before acting as synchronization sources, the system reduces the number of active transmitters in high-density scenarios, thereby reducing interference while maintaining decentralized operation.
Solution Approach 2:
The patent applies partial action by not allowing all terminals to simultaneously act as synchronization sources. Instead, only terminals meeting specific signal strength and velocity criteria are permitted to transmit, creating a controlled subset of active sources that reduces overall interference while maintaining system robustness.
4Object-generated harmful factors
If wireless terminals check synchronization reliability factors before transmitting, then interference is reduced and resource usage is optimized, but the operation becomes more complex and time-consuming
Solution Approach 1:
The patent implements self-service by enabling wireless terminals to autonomously evaluate their own synchronization reliability (signal strength, velocity) and make independent decisions about whether to act as synchronization sources. This self-evaluation mechanism reduces interference and optimizes resource usage while maintaining operational simplicity through automated decision-making at the terminal level.
Solution Approach 2:
The patent uses feedback loops where terminals continuously monitor their synchronization conditions and adjust their transmission behavior accordingly. This automated feedback mechanism reduces interference and optimizes resource usage while keeping the operation simple through rule-based decision-making embedded in the terminal firmware.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A wireless terminal comprises sidelink controlling circuitry and transmitting circuitry. The sidelink controlling circuitry is configured to select a reference source. The transmitting circuitry is configured to transmit sidelink synchronization signal (SLSS) based on the reference source. In a case that a timing reference is Global Navigation Satellite System (GNSS) and the GNSS is reliable according to a comparison with a threshold value, the sidelink controlling circuitry is configured to select GNSS as the reference source.