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We report on the results of a measurement study carried out on a commuter busin Dublin, Ireland using the Google/Apple Exposure Notification (GAEN) API.This API is likely to be widely used by Covid-19 contact tracing apps.Measurements were collected between 60 pairs of handset locations and arepublicly available. We find that the attenuation level reported by the GAEN APIneed not increase with distance between handsets, consistent with there being acomplex radio environment inside a bus caused by the metal-rich environment.Changing the people holding a pair of handsets, with the location of thehandsets otherwise remaining unchanged, can cause variations of +/-10dB in theattenuation level reported by the GAEN API. Applying the rule used by the SwissCovid-19 contact tracing app to trigger an exposure notification to our busmeasurements we find that no exposure notifications would have been triggereddespite the fact that all pairs of handsets were within 2m of one another forat least 15 mins. Applying an alternative threshold-based exposure notificationrule can somewhat improve performance to a detection rate of 5% when anexposure duration threshold of 15 minutes is used, increasing to 8% when theexposure duration threshold is reduced to 10 mins. Stratifying the data bydistance between pairs of handsets indicates that there is only a weakdependence of detection rate on distance.

Measurement-Based Evaluation Of Google/Apple Exposure Notification API For Proximity Detection in a Commuter Bus