Critical Analysis of Encounter Traces

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The limitations of contact-logging experiments, particularly those based on periodic Bluetooth neighborhood scans, prevent them from detecting many contact opportunities. This paper highlights recent results on inferring a plausible movement from contact traces and shows how they may be used to identify those missed contacts. This analysis is then applied to the Rollernet contact trace and indicates that these missed contacts have an important impact on protocol performance evaluation. Direct capture and measurement of human mobility is essential for improving the authors' understanding of the new networks and communications opportunities that arise from cheap, ubiquitous, portable, multi-radio devices.