Indoor Positioning with an Enterprise Radio Access Network

We introduce an indoor positioning technology based on an enterprise 3G UMTS radio access network and unmodified mobile phones. We describe the architecture and operation of a prototype that we have developed, and present empirical operational results from multiple enterprise settings. We discuss the relative advantages of using an enterprise RAN platform for indoor positioning, and examine both the challenges shared with alternative RF-based positioning technologies (e.g., WiFi), as well as the new and unique challenges that indoor cellular introduces. Finally, we present empirical results on location accuracy, and discuss how we seek to further improve accuracy using smartphone-based sensors and multiple radios.