Cable Length Positioning for Indoor Mobile Device Accuracy
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Solution Overview
Problem
Existing systems face challenges in accurately determining the location of mobile communication devices indoors, particularly for emergency positioning, as satellite positioning is unreliable indoors and cell ID positioning lacks the necessary accuracy to meet stringent requirements.
Innovation Solution
A positioning system that determines the location of a mobile communication device by calculating the cable length value between a radio head and a base station, using this value to obtain location information through a fingerprint-based method, which includes polygon coordinate vectors and radio property values, to improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell ID positioning is used to determine MCD location, then the positioning system is simple to implement, but the positioning accuracy is insufficient to meet emergency positioning requirements
Solution Approach 1:
The patent segments the base station coverage area into multiple zones based on cable length segments. Each cable length segment corresponds to a specific geographic region, allowing the system to determine MCD location by identifying which segment the MCD is in. This segmentation transforms the粗放 cell ID positioning into fine-grained zone-based positioning, achieving up to 8 times improvement in accuracy while maintaining system simplicity.
Solution Approach 2:
The patent introduces cable length as an additional dimension for positioning. Instead of relying solely on horizontal cell ID positioning, the system adds the cable length dimension (distance from base station to radio head) to create a two-dimensional positioning framework. This dimensional extension enables the system to meet stringent vertical accuracy requirements (3 meters) for emergency positioning.
2Reliability
If radio heads are installed indoors with cable connections to base stations, then indoor signal coverage is improved, but the complexity of the network infrastructure increases
Solution Approach 1:
The patent makes the existing cable infrastructure serve a dual purpose: it continues to provide signal transmission between radio heads and base stations while simultaneously functioning as a positioning reference. The cable length, originally just an installation parameter, is repurposed as a location identifier. This multi-functionality eliminates the need for separate positioning infrastructure, maintaining simplicity while improving indoor coverage reliability.
Solution Approach 2:
The system uses the cable infrastructure's own physical property (cable length) to provide positioning services. Instead of requiring additional positioning equipment or external references, the network infrastructure serves itself by utilizing the inherent characteristics of its own components. The cable length naturally encodes location information, allowing the system to self-determine MCD positions without external assistance.
3Measurement precision
If cable length values are determined and used for positioning, then positioning accuracy is significantly improved, but the complexity of positioning calculations increases
Solution Approach 1:
The patent performs preliminary segmentation of the service area into discrete cable length segments during network planning and deployment. Each segment is pre-defined with specific cable length ranges and corresponding geographic boundaries. When positioning is needed, the system simply matches the measured cable length against these pre-defined segments rather than performing complex real-time calculations, significantly reducing computational complexity while maintaining high accuracy.
Solution Approach 2:
The patent transforms the continuous cable length parameter into discrete segments for positioning purposes. By changing the parameter representation from continuous to discrete, the system simplifies the positioning calculation from a continuous optimization problem to a discrete matching problem. This parameter transformation maintains positioning accuracy while dramatically reducing computational complexity.
Data Source
AI summary
A localization approach based on cable length detection. In one aspect, a method performed by a positioning system for determining the location of a mobile communication device (MCD) is provided. In some embodiments, the method includes the positioning system determining a cable length value representative of the length of the cable connecting a base station to a radio head serving the MCD. The positioning system then determines a location of the MCD based on the determined cable length.