GNSS Synchronization Source Selection in 5G V2X Terminals
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Solution Overview
Problem
In the context of 5G NR V2X networks, terminals face challenges in determining a synchronization source when multiple synchronization sources are available, as existing technologies lack a defined mechanism for selecting the appropriate source based on terminal capabilities and network configuration.
Innovation Solution
A method for determining a synchronization source in a terminal involves detecting a GNSS signal, using it as the synchronization source if detected, or determining it based on terminal receiving capability and network configuration information, considering factors like frequency band, received power, synchronization priority, and subcarrier spacing, to ensure accurate and reliable synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-carrier synchronization processing is implemented with multiple synchronization sources, then synchronization coverage and reliability are improved, but the mechanism for determining the appropriate synchronization source is undefined and complex
Solution Approach 1:
The patent applies parameter changes by establishing a multi-dimensional evaluation framework that changes the selection criteria from simple signal strength to a comprehensive set of parameters including synchronization signal strength, frequency band, subcarrier spacing, and terminal capability matching. This resolves the contradiction by providing a structured method to evaluate multiple synchronization sources across different carriers, improving reliability while managing complexity through systematic parameter comparison.
2Measurement precision
If synchronization source selection is based on multiple parameters including frequency band and subcarrier spacing, then synchronization accuracy is improved, but the determination process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the synchronization source determination process into distinct evaluation stages: first evaluating synchronization signal strength, then assessing frequency band compatibility, followed by subcarrier spacing matching, and finally terminal capability verification. This segmented approach improves synchronization accuracy through comprehensive parameter evaluation while reducing overall complexity by breaking down the determination process into manageable, sequential steps.
Solution Approach 2:
The patent applies dynamics by making the synchronization source selection process adaptive to terminal capabilities and network conditions. The evaluation criteria dynamically adjust based on terminal receiving capability and supported features, allowing the system to optimize synchronization accuracy while managing complexity according to specific terminal requirements rather than using a fixed rigid process.
3Adaptability or versatility
If the terminal evaluates multiple synchronization sources across different carriers, then synchronization coverage is improved, but the processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring terminal capability information and network configuration parameters before the actual synchronization determination process. The terminal and network prepare evaluation criteria and parameter sets in advance, allowing the synchronization source selection to proceed efficiently by comparing against pre-established standards rather than calculating all parameters in real-time, thus improving coverage while reducing determination time.
Data Source
AI summary
A method for determining a synchronization source and a terminal are provided. The method includes: detecting a synchronization signal of a global navigation satellite system GNSS; when the synchronization signal of the GNSS is detected, using the GNSS as the synchronization source of a terminal; otherwise, determining the synchronization source of the terminal according to receiving capability of the terminal and network configuration information.