DecaFriend: Serverless indoor localization system on mobile phone platform

Mobile phone is now becoming a necessary gadget in our daily life. Mobile applications have been proposed to advance the function of mobile phone. Location service application is a kind of mobile application that provides location information such as current location of the mobile phone. GPS is the popular technology for location service on mobile phone because many models of mobile phone are embedded with GPS sensor. Although GPS can provide high accuracy over outdoor scenario, GPS cannot provide good accuracy in indoor environment because the GPS signal from GPS satellites is blocked by the structure of building. The indoor localization systems have been proposed to address the above-mentioned problem. Many indoor localization systems require costly back-end server to process location. Moreover, the devices need to connect to the back-end servers to request the service. In this paper, we propose a serverless indoor localization system for mobile phone platform. The proposed system does not need any support from back-end server. The localization is processed on mobile phone. The system is developed as an Android application, utilizing Wi-Fi signal to determine the current location of mobile phone and uses mobile ad hoc network to disseminate the current location to other users in the system. The proposed system achieves accuracy up to 83.43% when the system is deployed in the two-floors building, which is the experimental site.