Proximity Messaging via Cellular LAC Broadcast and IMSI Capture
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Solution Overview
Problem
Existing solutions for proximity-triggered messaging in mobile communications are not scalable, accurate, or universally available due to limitations in Bluetooth-based relative positioning and cellular-based absolute positioning methods, including hardware requirements, battery consumption, and indoor coverage issues.
Innovation Solution
A method and system that combines relative and absolute positioning using standard cellular mechanisms to broadcast a unique Location Area Code, capture IMSI numbers, and send them to a central unit for valid identity translation and event triggering, enabling proximity-triggered messaging without the need for dedicated hardware or continuous polling, supporting a high number of concurrent users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Bluetooth-based relative positioning is used, then high positioning accuracy is achieved, but hardware requirements and device compatibility are limited
Solution Approach 1:
The patent introduces a local unit as an intermediary device that captures IMSI numbers via cellular networks and relays them to a central unit. This mediator enables proximity detection using standard cellular infrastructure that all mobile phones possess, eliminating the need for specialized Bluetooth hardware while maintaining a practical positioning capability through network-assisted identification.
2Ease of manufacture
If GPS-based absolute positioning is used, then no local box deployment is required, but indoor coverage is unavailable and battery consumption increases
Solution Approach 1:
The system leverages the mobile phone's existing cellular radio and IMSI identification capabilities to perform positioning functions. The phone's built-in cellular infrastructure serves the dual purpose of communication and location identification, eliminating the need for separate GPS hardware or continuous positioning operations that would drain battery.
Solution Approach 2:
Instead of continuous GPS tracking, the system triggers positioning actions only when specific cellular network events occur, such as when a phone enters a new location area or when proximity conditions are met. This event-driven approach replaces continuous battery-consuming operations with periodic, on-demand positioning.
3Speed
If continuous polling is used for position detection, then real-time location tracking is achieved, but network resources are consumed
Solution Approach 1:
The system replaces continuous polling with periodic, event-triggered position detection based on cellular network events. The local unit monitors for specific events such as location updates or proximity conditions, and only initiates messaging actions when these events occur, thereby maintaining real-time responsiveness while dramatically reducing network resource consumption compared to continuous polling.
Data Source
Figure 1
AI summary
System and method for enabling proximity-triggered messaging in certain coverage areas for social networks and communities-based services, the system comprising: - at least one local unit (1,1') with cellular radio transceiver means, located within a corresponding coverage area (4,4') and configured for: • broadcasting a LAC different from any other LAC of the radio cells in the surroundings; • establishing a Location Update dialogue with any mobile phone (3,3') answering to the LAC broadcast, obtaining its IMSI number; • sending a Location Updating Reject message to each mobile phone (3,3') whose IMSI number has been obtained; • sending said IMSI number to a central unit (2); - the central unit (2) configured to: • obtain, for each IMSI number, one valid identity in a community-based service; • provide (11) at least one social network server (5,5') associated to the corresponding valid on-line identity with the valid identity.