OTDOA Positioning via Neighboring Cell SFN Timing
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Solution Overview
Problem
Current OTDOA positioning techniques face challenges in determining the System Frame Number (SFN) timing of neighboring cells, especially when the target device is connected to a network that does not support OTDOA positioning, such as when a UE is connected to an NR network that does not support OTDOA, making it difficult to perform accurate location determination.
Innovation Solution
The method involves receiving assistance data from a serving cell that includes SFN timing information of neighboring cells, determining the SFN timing of these cells, and using this information to calculate the time difference of arrival of Positioning Reference Signals (PRSs) to facilitate accurate positioning, even when the neighboring cells are not directly supported by the target device's network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target device is connected to a network that does not support OTDOA positioning (e.g., NR network), then the device can maintain connectivity and use advanced network features, but the device cannot perform accurate OTDOA positioning because the network does not provide the necessary positioning support
Solution Approach 1:
The patent introduces an intermediary mechanism where the serving cell (even if it doesn't support OTDOA) provides assistance data containing SFN timing information of neighboring cells. This intermediary data allows the UE to perform OTDOA positioning by measuring PRS from neighboring cells without requiring the serving cell itself to support OTDOA, thus resolving the contradiction between network compatibility and positioning accuracy
Solution Approach 2:
The patent applies preliminary action by having the serving cell pre-provide assistance data including SFN timing information of neighboring cells before the UE performs positioning measurements. This preliminary provision of timing information enables the UE to accurately measure time difference of arrival of PRS from neighboring cells, achieving accurate positioning even when the serving network doesn't support OTDOA
2Measurement precision
If the serving cell provides comprehensive assistance data including SFN timing information of neighboring cells, then positioning accuracy is improved, but the complexity of data management and processing increases
Solution Approach 1:
The patent extracts only the essential SFN timing information of neighboring cells from the complete assistance data and provides it to the UE. By taking out only the critical timing parameters needed for OTDOA positioning rather than providing all possible positioning data, the patent achieves accurate positioning while minimizing data processing complexity at the UE
Data Source
AI summary
Aspects of the disclosure provide a method for observed time difference of arrival (OTDOA) positioning. The method can include receiving from a serving cell of a first network assistance data for measuring time difference of arrival of positioning reference signals (PRSs) received from a plurality of neighboring cells of a second network, receiving from the serving cell a gap pattern for decoding a master information block (MIB) of a first neighboring cell of the plurality of neighboring cells, or a system frame number (SFN) offset of the first neighboring cell, and determining an SFN timing of the first neighboring cell based on the gap pattern for decoding the MIB of the first neighboring cell or the SFN offset of the first neighboring cell.