Medical Device Localization via WLAN and BLE Signal Fingerprinting
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Solution Overview
Problem
Current methods for locating medical devices and mobile control units in a building area are unreliable and imprecise, as they often result in inaccurate positioning due to interference and overlap of signals.
Innovation Solution
A medical device system utilizing a combination of WLAN and Bluetooth Low Energy (BLE) modules, with smart antennas and pre-recorded signal strength fingerprints, allows for precise localization by comparing received signal strengths with stored data to determine the exact room location using multiple access points and reading modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single radio service or distance detection method is used, then the device complexity is reduced, but the location tracking reliability and precision deteriorate
Solution Approach 1:
The patent combines multiple radio services (WLAN and Bluetooth Low Energy) into a unified location system. The control unit receives signals from both WLAN access points and BLE beacons, processes both signal types, and integrates their location data to determine the medical device's position. This merging of multiple detection principles overcomes the limitations of single-service systems and improves location tracking reliability without requiring excessive complexity.
2Reliability
If infrared signals are used for location tracking, then the line of sight requirement is enforced, but the location accuracy deteriorates when line of sight is not available
Solution Approach 1:
The patent introduces Bluetooth Low Energy beacons as intermediary elements that transmit location information through the building environment. These BLE beacons act as mediators between the medical device and the location determination system, providing reliable location data even when direct line of sight is unavailable. The control unit uses these intermediary signals to maintain accurate tracking without requiring continuous line of sight.
3Measurement precision
If multiple radio services are combined, then the location precision is improved, but the device complexity and signal interference increase
Solution Approach 1:
The patent segments the location determination task into distinct functional components: WLAN signal processing for general location estimation and Bluetooth Low Energy signal processing for precise positioning. Each radio service is handled by dedicated processing logic within the control unit, allowing the system to leverage the strengths of both services while managing their complexity through structured separation of functions.
Solution Approach 2:
The patent changes the operating parameters of the radio services by using Bluetooth Low Energy instead of traditional Bluetooth, which operates at lower power and with different frequency characteristics. This parameter change allows the system to achieve better precision while managing interference and complexity through optimized signal characteristics.
4Measurement precision
If signal strength comparison with fingerprints is used, then the location accuracy is improved, but the data processing time increases
Solution Approach 1:
The patent performs preliminary action by pre-establishing a database of signal strength fingerprints at various known locations before the medical device needs to be located. This database is created in advance and stored in the control unit or accessible storage system. When location determination is needed, the system simply compares current signal strengths against the pre-stored fingerprints, significantly reducing processing time compared to real-time calculations.
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
Enables reliable and precise location of medical devices and control units by reducing interference and enhancing data throughput, ensuring accurate positioning within the building area.
Implementation Method 1
WLAN access points (6) and an additional radio reader module (7)... WLAN transmitter modules (4)... signal strengths of signals emitted by the WLAN transmitter modules (4)
Implementation Method 2
additional radio transmitter modules (5)... additional radio reader modules (7)... Bluetooth Low Energy (BLE) modules... signal strengths of signals emitted by the other radio transmitter modules (5)
Data Source
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AI summary
The invention relates to a medical device system which comprises: at least one medical device (2); at least one mobile control unit (3) for a medical device (2), which has a WLAN transmission module (4) and an additional radio transmission module (5); at least one WLAN access point (6) having at least one antenna; at least one additional radio reader module (7); and a control device (8) that is connected to said at least one WLAN access point (6) and said at least one additional radio reader module (7), in order for said medical device and/or mobile control unit to be located in a reliable method.