CSI-Based Terminal Positioning Under Multipath Propagation
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Solution Overview
Problem
In wireless positioning technologies for 5G, particularly in industrial internet of things (IIoT) scenarios, multi-path propagation leads to inaccurate time and angle of arrival measurements, resulting in poor positioning accuracy.
Innovation Solution
A method and apparatus that utilize channel state information (CSI) to improve positioning accuracy by distinguishing CSI in time and frequency domains, and selecting appropriate measurement configurations to reduce workload and data amount, involving network elements and terminal devices in the communication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time of arrival and angle of arrival based positioning algorithms are used, then positioning can be performed in wireless environments, but positioning accuracy deteriorates due to multi-path propagation
Solution Approach 1:
The patent changes the measurement parameter from time of arrival/angle of arrival to channel state information (CSI). CSI includes amplitude, phase, and other channel characteristics that are less susceptible to multi-path effects. By measuring CSI instead of traditional parameters, the system achieves accurate positioning in multi-path environments without being significantly affected by signal reflections and scattering.
Solution Approach 2:
The patent introduces channel state information as an intermediary measurement quantity. Instead of directly measuring time of arrival or angle of arrival, the system measures CSI which serves as an intermediate parameter that captures channel characteristics including multi-path effects. This intermediary measurement allows the system to indirectly determine position while being robust to multi-path propagation.
2Measurement precision
If channel state information measurement and reporting is performed in detail, then positioning accuracy is improved, but measurement workload and data amount increase
Solution Approach 1:
The patent applies partial action by selecting and reporting only the most relevant CSI parameters for positioning. Instead of reporting all available channel state information, the system identifies and reports specific parameters (such as amplitude and phase of dominant paths) that are most useful for position determination. This reduces the data amount and measurement workload while maintaining sufficient positioning accuracy.
Solution Approach 2:
The patent segments the channel state information into different components and prioritizes reporting of critical segments. The CSI is divided into parameters such as path amplitude, path phase, delay, and angle information. The system segments the reporting burden by focusing on the most important segments for positioning rather than reporting all channel characteristics in full detail.
Data Source
AI summary
This application provides example positioning methods and example apparatuses. One example method includes sending, by a positioning management network element, a positioning measurement request to a positioning measurement network element. The positioning measurement request is used to request the positioning measurement network element to feed back channel state information of a terminal device. Then, the positioning management network element receives a positioning measurement response from the positioning measurement network element. The positioning measurement response includes the channel state information of the terminal device. Then, the positioning management network element determines a location of the terminal device based on the channel state information of the terminal device.