Sidelink Positioning Using Symbol-Based Clock Drift Compensation
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Solution Overview
Problem
Conventional positioning solutions in 5G sidelink communication suffer from reduced precision due to clock drift errors in devices, affecting the accuracy of time of flight measurements.
Innovation Solution
A method that involves sending and receiving signals between communication devices to determine the time of flight by incorporating symbol indexes and clock crystal oscillator error relationships, allowing for the correction of clock drift errors through measurement reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional RTT positioning solution is used without synchronization, then device operation is simplified, but positioning precision deteriorates due to clock drift errors
Solution Approach 1:
The patent introduces a positioning management network device as an intermediary that collects clock crystal oscillator error parameters from multiple communication devices and determines the first relationship indicating error correlations. This mediator enables precise positioning by handling the complex clock drift compensation calculations centrally, allowing terminal devices to perform positioning measurements without requiring strict synchronization while maintaining high precision through the intermediary's error relationship analysis
Solution Approach 2:
The patent implements feedback mechanisms where communication devices report clock crystal oscillator error parameters to the positioning management network device. The network device uses these feedback parameters to determine error relationships and compensate for clock drift effects in positioning calculations, continuously improving positioning precision based on actual device performance feedback
2Measurement precision
If clock drift compensation is implemented using traditional methods, then positioning precision is improved, but device complexity increases due to synchronization requirements
Solution Approach 1:
The positioning management network device serves as an intermediary that centralizes the complex clock drift compensation functionality. Instead of requiring each terminal device to implement complex synchronization mechanisms, the network device collects error parameters, determines relationships between device errors, and provides compensation calculations, thereby improving positioning precision while reducing individual device complexity
Solution Approach 2:
Communication devices automatically report their clock crystal oscillator error parameters to the positioning management network device without requiring manual configuration or complex inter-device synchronization protocols. Each device independently measures and reports its own error characteristics, enabling the system to achieve high precision through self-service error characterization combined with centralized analysis
Data Source
AI summary
Example positioning methods and apparatus are described. In one example method, a second apparatus sends a first signal to a first apparatus, and receives a first measurement report from the first apparatus. The second apparatus receives a second signal from the first apparatus, where the second signal is used for positioning between the first apparatus and the second apparatus. The second apparatus measures the second signal to obtain a second measurement report, where the second measurement report includes a third measurement value. The second apparatus determines time of flight between the first apparatus and the second apparatus based on a first relationship, the first measurement value, the third measurement value, and the first symbol index, where the first relationship indicates a relationship between a clock crystal oscillator error of the first apparatus and a clock crystal oscillator error of the second apparatus.