IMU Reporting for Hybrid Mobile Positioning in Low-Signal Areas
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Solution Overview
Problem
Existing positioning technologies for mobile devices, such as GNSS and OTDOA, struggle in environments with limited satellite visibility, like indoors or urban areas, and face challenges in accurately tracking fast-moving unmanned vehicles.
Innovation Solution
Adaptive IMU data reporting from mobile devices to enhance positioning accuracy and reliability by integrating inertial measurement data with radio network-based methods, allowing for real-time adjustment of reporting frequency and type based on mobility and latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS or OTDOA positioning methods are used, then positioning can be obtained in open environments, but positioning accuracy deteriorates in indoor and urban areas
Solution Approach 1:
The patent combines multiple positioning methods (GNSS, OTDOA, and IMU-based dead reckoning) into a hybrid positioning system. The network positioning node integrates data from different sources to provide reliable positioning in both open and challenging environments, resolving the contradiction between availability and accuracy.
Solution Approach 2:
The patent introduces an intermediary IMU-based dead reckoning system that bridges the gap between GNSS/OTDOA positioning methods. When satellite or network signals are unavailable or inaccurate, the IMU system provides continuous positioning data by calculating position changes based on acceleration and orientation measurements, acting as a mediator to maintain positioning accuracy.
2Measurement precision
If IMU data is reported at high frequency, then tracking accuracy for fast-moving vehicles improves, but network latency increases
Solution Approach 1:
The patent implements dynamic reporting intervals for IMU data, where the reporting frequency is adjusted based on the mobility state of the user equipment. When the device is stationary or moving slowly, reporting frequency is reduced. When the device is moving fast or changing direction rapidly, reporting frequency increases automatically, optimizing the balance between tracking accuracy and network latency.
Solution Approach 2:
The system changes the reporting parameter (time interval between reports) based on motion characteristics. The network positioning node receives mobility information and adjusts the IMU data reporting interval accordingly, using parameter changes to adapt to different operational scenarios and resolve the contradiction between accuracy and latency.
3Measurement precision
If IMU data reporting is continuously activated, then positioning accuracy is maintained, but device energy consumption increases
Solution Approach 1:
Instead of continuous IMU data reporting, the system uses periodic reporting with variable intervals. The reporting is triggered based on motion events or time intervals, where the frequency adapts to the current motion state. This periodic approach maintains positioning accuracy when needed while significantly reducing energy consumption during stationary periods.
Solution Approach 2:
The IMU data reporting mechanism is made dynamic, adjusting its operation based on motion detection and mobility state. The system activates high-frequency reporting only when motion is detected or positioning accuracy is critical, and reduces or suspends reporting when the device is stationary, thereby optimizing the balance between accuracy and energy consumption.
Data Source
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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.