Extended GNSS Measurement Reporting Format for Wireless Devices
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Solution Overview
Problem
Existing positioning methods in wireless communications networks, such as those using GNSS, face limitations in accuracy due to the resolution of code phase measurements and the inability to effectively utilize carrier phase measurements standalone, leading to positioning errors that render them unreliable for precise applications.
Innovation Solution
The implementation of an extended format for reporting code phase, carrier phase, and GNSS Signal ID measurements, which enhances the resolution and range of existing measurement reports, allowing for more accurate positioning by enabling the wireless device to determine the appropriate format based on estimated accuracy and optimizing signaling procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing measurement report formats are used, then backward compatibility is maintained, but measurement resolution and positioning accuracy remain limited to meter-level
Solution Approach 1:
The measurement report format is segmented into multiple fields with different resolutions. The code phase measurement is divided into integer milliseconds and fractional milliseconds parts, allowing selective reporting based on required precision. This segmentation enables the system to achieve cm-level positioning accuracy when needed while maintaining compatibility with legacy systems that only require meter-level precision.
Solution Approach 2:
The measurement report format is made dynamic by introducing optional fields and variable precision representations. The wireless device can dynamically select which fields to include based on the estimated accuracy and positioning requirements. This dynamic approach allows the system to adapt between meter-level and cm-level accuracy without requiring a completely new format, thus resolving the contradiction between precision improvement and format complexity.
2Measurement precision
If extended format with higher resolution is used, then positioning accuracy improves to cm-level, but signaling overhead and bit transmission increase
Solution Approach 1:
Higher measurement resolution is applied locally only when and where needed. The wireless device estimates the accuracy of carrier phase measurements and selectively includes high-precision fields only when the estimated accuracy meets the threshold for cm-level positioning. This local quality approach ensures that bit transmission volume increases only for the necessary measurements, not universally across all reporting scenarios.
Solution Approach 2:
The system changes parameters dynamically based on measurement quality. When carrier phase measurement accuracy is sufficient, the system transitions to using extended format with higher resolution parameters. When accuracy is insufficient or cm-level positioning is not required, the system reverts to standard format with lower resolution parameters, thus minimizing bit transmission volume while achieving high precision when needed.
3Measurement precision
If carrier phase measurement is used standalone, then measurement resolution can be improved, but reliability decreases due to inability to resolve ambiguity
Solution Approach 1:
The patent merges code phase measurement and carrier phase measurement into a unified positioning approach. The code phase measurement provides reliable but lower-resolution data, while the carrier phase measurement provides high-resolution but ambiguous data. By combining both measurements and using the code phase to resolve the integer ambiguity of the carrier phase, the system achieves both high precision and reliability simultaneously, resolving the contradiction between using carrier phase standalone and using both together.
Data Source
AI summary
A method, performed by a wireless device (120), for reporting at least one measurement to a network node (130) is disclosed. The wireless device (120) determines (420) an extended format to be used for reporting, to the network node (130), at least one of: a code phase measurement, a carrier phase measurement or a GNSS Signal ID. The extended format extends at least one of: a range or a resolution, of an existing format for reporting the at least one of: the code phase measurement, the carrier phase measurement or the GNSS Signal ID. The wireless device (120) then sends (430) a measurement report comprising the at least one of: the code phase measurement, the carrier phase measurement or the GNSS Signal ID, to the network node (130), using the determined extended format. A method performed by the network node (130) is also described, whereby the network node (130) receives the measurement report.