Wireless Mobility Determination Using Channel State Information
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Solution Overview
Problem
Existing mobile device systems face challenges in accurately determining mobility states (static, environmental, micro-mobility, and macro-mobility) relative to wireless access points, which affects wireless channel quality and data transmission, particularly in scenarios where historical information is not reliable during movement.
Innovation Solution
A mobility determination apparatus and method that utilizes Channel State Information (CSI) and Time-of-Flight (ToF) measurements to classify mobility states without modifying mobile device software, selecting appropriate wireless protocols based on determined mobility states to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensors (GPS, accelerometer, gyroscope) are used to determine movement between mobile device and wireless AP, then mobility state can be determined, but the accuracy is insufficient especially in distinguishing micro-mobility and environmental mobility scenarios
Solution Approach 1:
The patent replaces traditional mechanical sensors (accelerometers, gyroscopes, GPS) with wireless signal-based measurement methods. Specifically, it uses Channel State Information (CSI) to detect movement by analyzing changes in wireless channel characteristics, and employs Time-of-Flight (ToF) measurements to determine distance and speed without requiring complex sensor hardware in the mobile device.
Solution Approach 2:
The patent introduces wireless signals as an intermediary medium to detect mobility. Instead of directly measuring physical movement with sensors, the system uses CSI and ToF measurements of wireless signals between the mobile device and access point to infer mobility state, speed, and distance, thereby avoiding direct mechanical measurement.
2Reliability
If historical information is used for protocol selection during movement, then data transmission can be maintained, but reliability deteriorates when historical information is not reliable during rapid movement
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors current mobility state (determined from CSI and ToF) and adjusts wireless protocol parameters accordingly. This real-time feedback loop allows the system to adapt to changing mobility conditions without relying on potentially outdated historical information, ensuring reliable data transmission during rapid movement.
Solution Approach 2:
The patent makes the protocol selection dynamic by continuously updating mobility state determination based on real-time CSI and ToF measurements. Instead of relying on static historical information, the system dynamically adjusts protocol parameters according to current movement conditions, enabling rapid adaptation to changing mobility scenarios.
3Measurement precision
If mobile device software is modified to implement mobility determination, then accurate mobility classification can be achieved, but ease of operation deteriorates due to software modification requirements
Solution Approach 1:
The patent inverts the traditional approach by moving the mobility determination logic from the mobile device to the wireless access point infrastructure. The access point performs CSI analysis and ToF measurements to determine mobility state, then communicates this information back to the mobile device. This eliminates the need to modify mobile device software while maintaining accurate mobility classification.
Solution Approach 2:
The patent uses the wireless network infrastructure as an intermediary to perform mobility determination. Instead of requiring software modifications in the mobile device, the system leverages the access point's capabilities to analyze CSI and calculate ToF, thereby determining mobility state without directly modifying the mobile device's software.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively determines mobility states and selects optimal wireless protocols, improving wireless channel quality and reducing data transmission loss by distinguishing between static, environmental, micro-mobility, and macro-mobility scenarios, thereby enhancing network performance during device movement.
Implementation Method 1
determining Channel State Information (CSI) for a wireless channel between a mobile device and a wireless access point (AP)
Implementation Method 2
determining Time-of-Flight (ToF) for a signal traversal between the mobile device and the wireless AP
Data Source
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AI summary
A method for mobility determination and a mobility determination apparatus are disclosed. The method for mobility determination comprises: determining channel state information (CSI) for a wireless channel between a mobile device and a wireless access point (AP); and using the CSI to determine, by a process, movement between the mobile device and the wireless AP.