Terminal Positioning via Channel Impulse Response
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Solution Overview
Problem
Current positioning technologies in wireless networks, such as LTE, face challenges in achieving high accuracy and efficiency due to user mobility and environmental changes, particularly in indoor and urban scenarios, where GPS accuracy is compromised, and existing methods require multiple base stations and additional reference signals, leading to limitations in positioning accuracy and processing complexity.
Innovation Solution
A system and method that utilize channel estimation and channel impulse response measurement data, processed by a positioning service function entity using a neural network model, to accurately determine the location of a terminal device, reducing the need for multiple base stations and improving positioning accuracy by using uplink and downlink reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods (TOA, TDOA, UTDOA, DOA) are used in LTE systems, then positioning service is provided, but positioning accuracy only reaches tens of meters which cannot meet higher accuracy requirements
Solution Approach 1:
The patent changes the measurement parameters from traditional TOA/TDOA/DOA to channel estimation and channel impulse response parameters. By utilizing the channel state information already available in the system, it achieves meter-level positioning accuracy (11m for channel estimation, 8m for channel impulse response) without requiring additional positioning reference signals or multiple base stations.
2Measurement precision
If multiple base stations and additional positioning reference signals are deployed to improve positioning accuracy, then positioning precision may be improved, but device complexity and data transmission overhead increase
Solution Approach 1:
The patent makes existing communication resources serve dual purposes: downlink reference signals used for both channel estimation and positioning measurement. The channel state information, originally intended for communication quality assessment, is repurposed for positioning, eliminating the need for dedicated positioning reference signals and reducing system complexity.
Solution Approach 2:
The system uses its own existing channel estimation and reference signal infrastructure to provide positioning services, rather than requiring separate positioning infrastructure. The terminal device and base station leverage their existing measurement capabilities to achieve positioning without additional external support.
3Measurement precision
If more base stations participate in positioning to improve accuracy, then positioning precision improves, but processing complexity and calculation time increase
Solution Approach 1:
The patent extracts positioning information from the channel estimation process itself, rather than requiring separate positioning measurements from multiple base stations. By taking out the positioning capability from the traditional multi-base-station framework and embedding it in the channel estimation function, it achieves high accuracy with reduced processing complexity.
Data Source
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AI summary
Embodiments of this application disclose a method, an apparatus, and a system for positioning a terminal device. Location measurement data for a to-be-positioned terminal device is obtained by a terminal-side measurement function entity and/or an access-side measurement function entity, where the location measurement data includes a channel estimation and/or a channel impulse response that are/is obtained based on a corresponding downlink/uplink reference signal. The terminal-side measurement function entity and/or the access-side measurement function entity report/reports the location measurement data to a positioning function entity in a network, so that the positioning function entity can estimate a location of the terminal device based on the location measurement data, thereby positioning the terminal device and improving positioning accuracy. This technical solution can be applied to both a single-base-station-based positioning environment and a multi-base-station-based positioning environment, to position the terminal device.