SonicPACT: An Ultrasonic Ranging Method for the Private Automated Contact Tracing (PACT) Protocol

Throughout the course of the COVID-19 pandemic, several countries have developed and released contact tracing and exposure notification smartphone applications (apps) to help slow the spread of the disease. To support such apps, Apple and Google have released Exposure Notification Application Progra...

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Bibliographic Details
Published in:arXiv.org 2020-12
Main Authors: Meklenburg, John, Specter, Michael, Wentz, Michael, Balakrishnan, Hari, Chandrakasan, Anantha, Cohn, John, Hatke, Gary, Ivers, Louise, Rivest, Ronald, Sussman, Gerald Jay, Weitzner, Daniel
Format: Article
Language:English
Subjects:
Automation
Bluetooth
Contact tracing
COVID-19
Exposure
Mobile operating systems
Radio signals
Smartphones
Ultrasonic testing
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Summary:Throughout the course of the COVID-19 pandemic, several countries have developed and released contact tracing and exposure notification smartphone applications (apps) to help slow the spread of the disease. To support such apps, Apple and Google have released Exposure Notification Application Programming Interfaces (APIs) to infer device (user) proximity using Bluetooth Low Energy (BLE) beacons. The Private Automated Contact Tracing (PACT) team has shown that accurately estimating the distance between devices using only BLE radio signals is challenging. This paper describes the design and implementation of the SonicPACT protocol to use near-ultrasonic signals on commodity iOS and Android smartphones to estimate distances using time-of-flight measurements. The protocol allows Android and iOS devices to interoperate, augmenting and improving the current exposure notification APIs. Our initial experimental results are promising, suggesting that SonicPACT should be considered for implementation by Apple and Google.
ISSN:2331-8422