MME High-Resolution Location Reporting for Lawful Interception
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Solution Overview
Problem
Current Evolved Packet System (EPS) technologies provide location information with lower resolution during Lawful Interception, as the Mobility Management Entity (MME) only reports changes at the Tracking Area level, which is not sufficient for accurate location tracking and compliance with regulatory requirements.
Innovation Solution
The MME generates monitoring events with high-resolution location information for each Service Request procedure, allowing for enhanced location tracking beyond the Tracking Area level, by sending a monitoring message with detailed user location within the tracking area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MME reports location information only at Tracking Area level, then signaling overhead is reduced, but location resolution is insufficient for lawful interception requirements
Solution Approach 1:
The patent applies local quality by differentiating location reporting based on the specific service context. For lawful interception, high-resolution location information (cell level) is reported, while for normal operations, lower-resolution tracking area level reporting suffices. This selective approach ensures that detailed location data is only transmitted when legally required, balancing precision needs with signaling efficiency.
Solution Approach 2:
The patent changes the resolution parameter of location information based on service type. The MME is configured to report location at different granularities: tracking area level for general mobility management and cell level for lawful interception. This dynamic parameter adjustment allows the system to meet varying precision requirements without consistently incurring high signaling overhead.
2Measurement precision
If the MME reports location changes for every Service Request, then location tracking accuracy is improved, but network signaling increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring the MME with lawful interception parameters before actual interception begins. The MME receives configuration information indicating which subscribers are subject to lawful interception and what resolution is required. This advance setup enables the MME to automatically report high-resolution location data for these specific subscribers without requiring additional real-time configuration or increasing signaling for all users.
Solution Approach 2:
The patent applies partial action by reporting detailed location information only for a subset of subscribers who are subject to lawful interception, rather than for all subscribers. The MME selectively generates monitoring events with high-resolution location data only when required by lawful interception warrants, thereby achieving accurate location tracking for target subscribers while minimizing overall network signaling overhead.
Data Source
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AI summary
The present invention relates to a method to enhance resolution of location information of a mobile user in an Evolved Packet communication System. The system comprises a Mobility Management Entity that provides the user with at least one tracking area in which the user is able to move without location information being reported, The method comprises the following steps: - receiving to the Mobility Management Entity, a location activation message valid for the user. - receiving to the Mobility Management Entity, a service request related to the user; - detecting in the Mobility Management Entity, user location information with higher resolution than the at least one tracking area level resolution; - sending from the Mobility Management Entity, a monitoring message comprising high resolution information of the user' s location within the at least one tracking area.