Mobile Terminal Path Characterization Using Temporary Identifiers
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Solution Overview
Problem
Existing methods for tracking mobile user terminals lack precision in determining travel paths and require user authorization, compromising privacy and accuracy.
Innovation Solution
Utilizing temporary identifiers like TMSI and session identifiers from Minimization of Drive Test (MDT) signals to track and characterize paths without user consent, calculating indicators such as dispersion, morphology, and interaction to classify user behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell-level presence detection is used to track mobile devices, then user privacy is protected, but path tracking precision is insufficient
Solution Approach 1:
The patent introduces temporary identifiers (TMSI) and session identifiers as intermediary elements that enable path tracking without exposing user identity. These identifiers act as mediators between the tracking system and user privacy, allowing the network to track device movements through multiple cells while the user's personal information remains protected and anonymous.
Solution Approach 2:
The patent creates a copy of user identity information in the form of temporary identifiers (TMSI) that can be used for tracking purposes. Instead of using the actual user identity, the system uses these temporary copies that contain sufficient information for path characterization but do not reveal the user's true identity, thus protecting privacy while enabling precise tracking.
2Measurement precision
If user authorization is required for device tracking, then data accuracy improves, but operational complexity and user burden increase
Solution Approach 1:
The patent implements a self-service tracking mechanism where the mobile device automatically provides the necessary information (TMSI, session identifiers, location data) to the network without requiring user intervention. The device itself serves the tracking function by transmitting data that the network can use to characterize paths, eliminating the need for users to manually authorize each tracking operation.
Solution Approach 2:
The patent leverages existing telecommunications protocols and signaling mechanisms that already serve multiple purposes (connection management, authentication, location reporting) to also enable path tracking. By making the tracking system universal and integrated into existing network operations, it achieves high accuracy without adding separate authorization steps, as the same signaling channels used for normal operations are utilized for tracking.
3Measurement precision
If detailed path information is collected, then mobility analysis accuracy improves, but data processing complexity increases
Solution Approach 1:
The patent segments the path tracking data into discrete characterization indicators (dispersion indicator, morphology indicator, dynamic indicator, interaction indicator). Each indicator represents a specific aspect of path characteristics and can be calculated independently from standardized position data. This segmentation allows the system to process detailed path information accurately while managing complexity through modular, standardized indicator calculations.
Data Source
AI summary
Method for characterization of paths travelled by mobile user terminals, comprising: determining a geographical area of interest; detecting the presence of a plurality of mobile user terminals in said geographical area of interest. The method further comprises, for each of said mobile user terminals: receiving over time a plurality of information signals, each information signal including: a geographical position of said mobile user terminal, a time reference associated with said geographical position and at least one of a temporary identifier and a session identifier; based on said information signals, determining a path travelled by said mobile user terminal; calculating one or more indicators associated with said path, said one or more indicators being indicative of morphologic and dynamic features of said path; providing a characterization of said paths, based on said one or more indicators.