Indoor Outdoor Call Judgment Using Network Event Logs
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Solution Overview
Problem
Current methods fail to accurately determine whether a call is made from an indoor or outdoor location when served by outdoor cellular network services, hindering network optimization and service improvement efforts.
Innovation Solution
A method utilizing event logs and geo-location tools, combined with algorithms and indicator functions, to differentiate between indoor and outdoor calls by analyzing drive test data, user behavior, and signal strength differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS positioning is used for outdoor detection, then positioning accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the outdoor detection function from the mobile device by using network-side event-log data collection and positioning algorithms. The network infrastructure (base stations, event logs) performs the positioning and indoor/outdoor determination, removing the need for GPS hardware and processing in the user device, thus reducing device complexity while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces an intermediary positioning algorithm that uses event-log data as a mediator between the mobile device and the final positioning result. Instead of direct GPS measurement, the system uses network event logs (handover records, signal strength measurements) as intermediate data to determine position and indoor/outdoor status, reducing device requirements.
2Device complexity
If event-log positioning is used, then device complexity is reduced, but the ability to determine indoor/outdoor location is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-defining indoor and outdoor signal strength thresholds and patterns before actual positioning. The system pre-processes event-log data to establish characteristic signal patterns for indoor versus outdoor environments, enabling accurate classification without complex real-time processing in the device.
Solution Approach 2:
The patent changes parameters by analyzing multiple signal strength parameters simultaneously (received signal code power, signal-to-noise ratio, handover timing) rather than relying on a single parameter. By monitoring changes in these parameters over time and comparing them against predefined thresholds, the system accurately determines indoor/outdoor status using only network-side event logs.
Data Source
AI summary
The indoor/outdoor call judgment method comprises the following steps. Firstly, to build an algorithm and indicator function for determining indoor/outdoor call by analyzing drive test data. Secondly, to retrieve the event log data to be judged by the method, and find the position of the retrieved event log data by means of geo-location tools. Thirdly, to determine whether the retrieved event log data are referring to a moving call, if “YES”, then the event log is determined to be referring to an outdoor call. Fourthly, to determine whether or not the event log data are referring to an Indoor call by using the pre-built algorithm and the indicator function. Users' behavior, Cell antenna module and signal strength difference are considered when building the algorithm and indicator function so as to increase the accuracy of the indoor/outdoor call judgment method.