Radiating Cable Localization via Power Level Comparison
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Solution Overview
Problem
Current methods fail to accurately localize mobile devices within tunnels and buildings using radiating cables, making it difficult for emergency services to determine the location of users during emergencies without relying on network providers.
Innovation Solution
A method and system that measures and compares power levels on opposing ends of a radiating cable with an attenuator, allowing for the determination of active mobile devices and their location relative to the attenuator, enabling localization without network provider information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiating cables are used to provide radio coverage in tunnels and buildings, then connectivity is improved, but localization capability deteriorates
Solution Approach 1:
The radiating cable is divided into multiple sections by inserting attenuators at specific locations. Each section between attenuators acts as an independent segment with distinct signal characteristics. By measuring power levels at cable ends and comparing them against expected attenuation values, the system can determine which segment a mobile device is located in, thereby achieving localization while maintaining continuous coverage through the segmented structure.
2Quantity of substance
If power levels are measured to determine number of users, then user count capability is improved, but location information deteriorates
Solution Approach 1:
Attenuators are introduced as intermediary elements at known positions along the radiating cable. These attenuators create distinct power level signatures for different cable sections. By measuring power levels at the cable ends and comparing them against the known attenuation values of intermediaries, the system can simultaneously determine both the number of active users and their approximate locations along the cable without requiring additional sensors or network provider information.
3Measurement precision
If network provider information is requested for emergency localization, then accuracy is improved, but response time deteriorates
Solution Approach 1:
The radiating cable system performs self-service localization by using its own infrastructure (the cable and attenuators) to determine user locations. The base station measures power levels directly from the cable ends and processes this information locally to identify user segments, eliminating the need to contact external network providers. This self-contained approach provides accurate localization information immediately during emergencies without external dependencies or communication delays.
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 timely and accurate localization of mobile devices along radiating cables, facilitating emergency response by determining the number and location of users without requiring information from multiple network providers.
Implementation Method 1
The radiating cable has an attenuator located between said opposing ends. The method comprises measuring power levels on opposing ends of a radiating cable and comparing the power levels to determine location of mobile devices.
Data Source
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AI summary
The present invention is directed to a method for localizing mobile devices. The method comprises the step of measuring power levels on opposing ends of a radiating cable. The radiating cable has an attenuator (102) located between said opposing ends (100,104). The radiating cable is adapted to be used for communicating with the mobile device. The method further comprises the step of comparing the power levels on the opposing ends of the radiating cable. Additionally, the method comprises the step of determining whether mobile devices (107,109) are communicating using the radiating cable on the basis of the measured power levels.