Mobile Phone Localization via Mini BTS Signal Detection
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Solution Overview
Problem
Existing methods for localizing a mobile telephone using low-power mini BTS in cellular networks are inefficient due to prolonged connection times and inaccurate signal strength comparisons, leading to missed localization events and insufficient service quality.
Innovation Solution
A method that detects changes in signal strength on a mobile telephone's SIM card, informs the SIM card program of new base stations, checks if the new station is a low-power mini BTS, and only triggers a localization event when signal strength exceeds a minimum threshold, allowing for precise location determination using a database of mini BTS identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile telephone executes the full connection procedure to the GSM network through the low-power mini BTS, then the localization event can be detected, but the time required for connection exceeds the time the telephone spends in the mini BTS coverage area, causing missed localization events
Solution Approach 1:
The system performs preliminary actions by having the mobile telephone continuously measure and evaluate signal strength from mini BTS before a full connection is established. The SIM card program monitors signal conditions in advance and prepares for localization events, triggering connection only when localization is actually needed, thus avoiding missed events while reducing unnecessary connection time
Solution Approach 2:
The mobile telephone autonomously evaluates signal strength from mini BTS and determines when localization events should occur without requiring full network connection procedures. The device self-manages the detection process by comparing signal strength thresholds and triggering localization only when conditions are met, eliminating the need for continuous connection maintenance
2Reliability
If the signal strength from mini BTS is comparable with other signals but does not guarantee sufficient service quality, then the known method does not propose the mini BTS for log-in procedure, but this prevents localization events from occurring in the mini BTS range
Solution Approach 1:
The system separates the localization function from the service quality requirement by implementing two independent evaluation mechanisms: one for detecting localization events (based on signal presence and identifier matching) and another for determining service quality (based on signal strength thresholds). This segmentation allows localization to occur even when service quality is marginal, as long as the mini BTS identifier is detected
Solution Approach 2:
The SIM card program acts as an intermediary that decouples the localization detection process from the network connection decision. It independently evaluates whether a localization event should be triggered based on signal strength comparison, then separately determines whether to propose the mini BTS for log-in based on service quality criteria, allowing these two functions to operate independently
Data Source
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AI summary
The subject of the invention is a means to locate a mobile telephone, applied in particular to the provision of services rendered to the owner of the mobile telephone, such as information on shops and services in the immediate area. The essence of the method based on the invention relies on the fact that a telephone in the invention is introduced to an area in range of a low-power mini BTS (base transceiver station). This fact is detected as the value of signal strength received from the low-power mini BTS compared as regards the order of magnitude with the strength of signal received from a high-power urban BTS. This is detected on the basis of changes in the list of the strongest signals received by the mobile telephone. A programme operating in the SIM card of the mobile telephone is informed of such change in the list. With the aid of the programme, the identifier of each new base station on the list is checked. If the identifier comes from the range assigned to base stations used for localisation, information on this event is transmitted to the exchange. On this basis, with the aid of a database, the location of the mobile telephone is determined as the location of the low-power mini BTS.