Privacy-preserving Travel Time Prediction with Uncertainty Using GPS Trace Data
This work is significant for individuals concerned about location privacy, offering a method to enable useful travel time prediction services without compromising personal GPS trace data.
This paper addresses privacy concerns in travel time prediction by proposing a geo-indistinguishability-based method that avoids collecting individual GPS trace data. The method achieves satisfactory prediction accuracy with reasonably small privacy costs, while also providing analytical and experimental utility analysis.
The rapid growth of GPS technology and mobile devices has led to a massive accumulation of location data, bringing considerable benefits to individuals and society. One of the major usages of such data is travel time prediction, a typical service provided by GPS navigation devices and apps. Meanwhile, the constant collection and analysis of the individual location data also pose unprecedented privacy threats. We leverage the notion of geo-indistinguishability, an extension of differential privacy to the location privacy setting, and propose a procedure for privacy-preserving travel time prediction without collecting actual individual GPS trace data. We propose new concepts to examine the impact of geo-indistinguishability-based sanitization on the usefulness of GPS traces and provide analytical and experimental utility analysis for privacy-preserving travel time prediction. We also propose new metrics to measure the adversary error in learning individual GPS traces from the collected sanitized data. Our experiment results suggest that the proposed procedure provides travel time prediction with satisfactory accuracy at reasonably small privacy costs.