LTE Positioning Node Reference Signal Cell ID Sharing
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Solution Overview
Problem
Existing positioning methods in LTE networks, such as e-CID and OTDOA, suffer from poor accuracy when multiple base stations share the same cell ID, leading to inaccurate location determination of mobile terminals.
Innovation Solution
A positioning method that involves sending a terminal side measurement request based on a positioning node reference signal, including configuration information like positioning node identity, transmission timing, and antenna port information, to a target terminal, with the serving base station performing measurements and sending results to a location server for accurate location calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If e-CID positioning method is used when multiple base stations share the same cell ID, then positioning can be performed, but positioning accuracy deteriorates
Solution Approach 1:
The patent segments the cell ID into multiple components: cell identity part, positioning node identity part, and reference signal identity part. This segmentation allows the positioning system to distinguish between multiple base stations even when they share the same cell ID, thereby resolving the contradiction between maintaining cell ID sharing compatibility and achieving accurate positioning.
Solution Approach 2:
The patent introduces additional identification dimensions beyond the traditional cell ID. By adding positioning node identity and reference signal identity as separate identification layers, the system creates a multi-dimensional identification space that enables differentiation of base stations while maintaining compatibility with existing cell ID sharing mechanisms.
2Measurement precision
If OTDOA positioning method is used when multiple base stations share the same cell ID, then positioning can be performed, but positioning accuracy deteriorates
Solution Approach 1:
The patent segments the reference signal structure by introducing positioning node reference signals with unique positioning node identities and reference signal identities. This segmentation allows the OTDOA method to distinguish between multiple base stations sharing the same cell ID by measuring time differences of these uniquely identified reference signals, thereby resolving the accuracy issue while maintaining compatibility.
Solution Approach 2:
The patent introduces positioning node reference signals as an intermediary element between the base station and the terminal for positioning purposes. These reference signals carry unique positioning node identities and reference signal identities that act as mediators to enable the terminal to distinguish between multiple base stations sharing the same cell ID, thus resolving the contradiction.
3Measurement precision
If traditional positioning methods are used, then existing positioning infrastructure can be utilized, but positioning accuracy deteriorates in cell ID sharing scenarios
Solution Approach 1:
The patent segments the positioning information into distinct fields including cell identity, positioning node identity, and reference signal identity. This segmentation allows the system to maintain compatibility with existing positioning infrastructure while adding new identification layers that enable accurate positioning in cell ID sharing scenarios without requiring complete system replacement.
Solution Approach 2:
The patent designs the positioning node reference signal to serve multiple functions: it carries cell identity information for legacy compatibility, positioning node identity for multi-base station differentiation, and reference signal identity for signal-specific identification. This multi-functionality allows the same signal structure to support both traditional and enhanced positioning requirements.
Data Source
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AI summary
Embodiments of the present invention provide a positioning method and apparatus. The positioning method includes: sending, by a serving base station, a terminal side measurement request based on a positioning node reference signal to a target terminal according to configuration information of the positioning node reference signal; performing, by the serving base station, a base station side measurement based on the positioning node reference signal, and obtaining base station side measurement information based on the positioning node reference signal; and then sending terminal side measurement information based on the positioning node reference signal and the base station side measurement information based on the positioning node reference signal to a location server, so that the location server calculates location information of the target terminal. The positioning method and apparatus provided by the embodiments can implement accurate positioning on a terminal in a scenario in which a plurality of positioning nodes shares a same cell identity.