RSU Timing Offset Signaling for IoV Positioning Accuracy
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Solution Overview
Problem
The synchronization accuracy of the Internet of Vehicles (IoV) system is low due to timing drift between Road-Side-Units (RSUs), which affects the positioning accuracy of On-Board Units (OBU) in environments without Global Navigation Satellite System (GNSS) signals.
Innovation Solution
A method involving the transmission of pilot signals and positioning signaling by RSUs, including an ID, timing adjustment value, and timing offset value, to enable accurate synchronization and positioning determination by OBUs, thereby eliminating timing drift caused by propagation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RSUs are used to position vehicles in environments without GNSS signals, then positioning capability is improved, but synchronization accuracy deteriorates due to timing drift between RSUs
Solution Approach 1:
The patent introduces timing offset information as an intermediary element that mediates between the timing drift problem and positioning accuracy requirement. The timing offset information, transmitted via positioning signaling, acts as a compensating mechanism that allows OBUs to correct for propagation delays and achieve accurate positioning despite synchronization issues between RSUs
Solution Approach 2:
The patent changes the parameter representation by transmitting not only raw timing information but also pre-calculated timing offset values. This parameter transformation allows the system to convert the problematic propagation delay into a correctable offset value, enabling accurate positioning without requiring perfect synchronization between RSUs
2Measurement precision
If timing offset information is transmitted via positioning signaling, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the positioning signaling serve multiple functions: it carries both the essential positioning information and the timing offset information simultaneously. By embedding timing offset data within the existing positioning signaling structure rather than creating separate communication channels, the system achieves accurate positioning while minimizing additional signaling overhead
3Device complexity
If synchronization is performed between RSUs without timing offset compensation, then system complexity is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-transmitting timing offset information before the actual positioning measurement takes place. The RSUs compute their timing offsets relative to a reference RSU and embed this information in advance within the positioning signaling, allowing OBUs to directly use these pre-processed values without performing complex real-time synchronization calculations
Data Source
AI summary
A position determination method, a synchronization method, a device, an apparatus and a terminal are provided. The position determination method for a first RSU includes transmitting a pilot signal and a positioning signaling. The positioning signaling includes an ID of the first RSU, a timing adjustment value of the first RSU and a timing offset value of the first RSU. The timing adjustment value is an adjustment amount for synchronization between the first RSU and a synchronization source when the positioning signaling is transmitted, and the timing offset value is a timing offset between the first RSU and a second RSU.