V2X Sidelink Transmission Timing Error Control
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Solution Overview
Problem
The performance of V2X communication on NR-based sidelinks cannot be guaranteed due to the lack of research on defining a minimum timing error (Te) for transmission, which is essential for ensuring reliable communication.
Innovation Solution
A method for V2X sidelink communication that involves synchronization based on a synchronization reference user equipment (SyncRefUE), with predetermined transmission timing errors (Te) for different subcarrier spacings (SCS) of 15 kHz, 30 kHz, and 60 kHz, to ensure accurate timing for V2X sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no minimum timing error is defined for NR-based sidelink V2X transmission, then device complexity is reduced, but communication reliability cannot be guaranteed
Solution Approach 1:
The patent defines transmission timing error (Te) as a specific parameter with predetermined values based on subcarrier spacing (15 kHz, 30 kHz, or 60 kHz). By establishing this parameter with concrete numerical values, the patent resolves the contradiction by providing reliability guarantees without requiring complex dynamic timing error calculations, thus balancing reliability improvement with acceptable device complexity.
2Measurement precision
If transmission timing error is not controlled, then ease of operation is improved, but measurement precision of timing accuracy deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-defining the transmission timing error values based on subcarrier spacing configurations. This preliminary definition of timing error parameters (Te = 12×64×Tc for 15 kHz, Te = 8×64×Tc for 30 kHz, Te = 5×64×Tc for 60 kHz) allows devices to operate without complex real-time timing calculations, thereby maintaining ease of operation while ensuring measurement precision of timing accuracy is met.
3Reliability
If synchronization is performed based on SyncRefUE, then reliability of sidelink transmission is improved, but device complexity increases
Solution Approach 1:
The patent introduces SyncRefUE (synchronization reference user equipment) as an intermediary element that provides the timing reference for sidelink transmissions. By using SyncRefUE as a mediator, the patent improves transmission reliability through coordinated synchronization while avoiding the need for complex peer-to-peer timing calculations, thus managing device complexity at acceptable levels.
Data Source
AI summary
A disclosure of the present specification provides a method for V2X sidelink communication, which is performed by a vehicle to everything (V2X) device. The method may comprise the steps of: performing synchronization for V2X sidelink transmission on the basis of a synchronization reference user equipment (SyncRefUE); and performing V2X sidelink transmission on the basis of the synchronization. For the V2X sidelink transmission, a transmission timing error (Te) may have a value smaller than or equal to a first value. The first value may be predetermined on the basis of a subcarrier spacing (SCS) of a sidelink signal, and the subcarrier spacing (SCS) may include 15 kHz, 30 kHz, and 60 kHz.