In this paper, the authors introduce an interactive visualization and analysis system for Drive Test Data (DTD) evaluation designed to provide first-hand mobile-phone performance assessment for different parties—including phone manufacturers and network providers—to review phone and network performance such as service coverage and voice quality. The authors propose an integrated data-visualization system, iVESTA (interactive Visualization and Evaluation System for drive Test dAta) for mobile phone drive-test data. The objective was to project high-dimensional DTD data onto well-organized web pages, such that users can visually study phone performance with respect to different factors. iVESTA employs a web-based architecture, which enables users to upload DTD and immediately visualize the test results and observe phone and network performance with respect to factors such as dropped call rate, signal quality, vehicle speed, handover and network delays. iVESTA provides a practical test environment for phone manufacturers and network service providers to perform comprehensive studies on their products from the real-world DTD.
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