Adaptive IMU Position Reporting for Fast Mobile Tracking
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Solution Overview
Problem
Current positioning methods for mobile devices, such as GNSS and OTDOA, face challenges in providing accurate and rapid positioning, especially for unmanned vehicles that require detailed tracking of rapid movements and changes in direction, particularly in environments where satellite signals are difficult to detect.
Innovation Solution
A method and system for adaptive reporting of inertial measurement data from mobile devices to a positioning node in a radio network, allowing for enhanced positioning accuracy and speed by integrating inertial measurement unit (IMU) data with existing positioning methods, including the use of report control data to manage data reporting intervals based on mobility and latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods (GNSS/OTDOA) are used, then positioning coverage is provided, but positioning accuracy and speed are insufficient for rapid movement tracking
Solution Approach 1:
The patent combines inertial measurement data from IMU sensors with traditional radio network positioning data (OTDOA/GNSS) to create a hybrid positioning system. The positioning node processes both types of data together, allowing the system to leverage the high-speed capability of inertial measurements while maintaining the geographic reference accuracy of traditional methods, thereby resolving the contradiction between positioning accuracy and speed.
Solution Approach 2:
The system performs preliminary positioning using inertial measurement data at high update rates before traditional positioning methods can provide updates. The inertial data provides preliminary position estimates that are then refined or corrected when traditional positioning data becomes available, enabling fast initial positioning responses without sacrificing ultimate accuracy.
2Productivity
If inertial measurement data is reported continuously at high frequency, then positioning speed and accuracy improve, but network data traffic and device power consumption increase
Solution Approach 1:
The system dynamically adjusts the reporting frequency of inertial measurement data based on the mobility state of the mobile device. When the device is detected to be moving rapidly or changing direction, the reporting frequency increases to capture the dynamic motion. When the device is stationary or moving slowly, the reporting frequency decreases, optimizing the balance between positioning performance and energy consumption.
Solution Approach 2:
The network controls the reporting parameters (frequency, data volume) of inertial measurement data based on service requirements and device mobility conditions. By dynamically changing these parameters, the system achieves high positioning update rates when needed while reducing power consumption during periods of lower positioning requirements.
3Measurement precision
If inertial measurement data is integrated with traditional positioning data, then positioning accuracy for rapid movement improves, but system complexity increases
Solution Approach 1:
The patent introduces a positioning node as an intermediary that handles the complex processing and fusion of inertial measurement data with traditional positioning data. The mobile device itself does not need to perform complex fusion algorithms, as the positioning node receives raw or pre-processed data from both sources and performs the integration, thereby improving positioning accuracy for rapid movement while keeping device complexity manageable.
Data Source
AI summary
Method for providing positioning data in a positioning node of a radio network, which positioning data is associated with a mobile device including a radio unit, the method comprising the steps of establishing a radio session for receiving positioning data in the positioning node from the radio unit; transmitting report control data to the radio unit, wherein the report control data identifies a request to report positioning data obtained in the device, wherein said positioning data includes inertial measurement data; and receiving positioning data from the radio unit in accordance with the report control data.