Smooth device handover system for seamless audio service

Abstract

Device handover based on user's movement without relying on an infrastructure enables various services in a localized personal area. We present an audio speaker handover system based on wireless distance estimation in a Bluetooth environment. It is designed to enable smooth device handover at walking speed without any help from the infrastructure. For smooth device handover, we studied the distance estimation method which satisfies a fast reaction and high resolution. We collected received signal strength indicator (RSSI) values and transmission power level (TPL) values and determined a relative distance using the model function obtained by statistical analysis method. With these methods, we experimented and analyzed the performance of device handover. Based on these experiments, we proposed a modified RSS based distance estimation that limit the transmission power control function. We also showed that the proposed system achieves good performance in the aspects of handover delay time and handover failure rate. © 2011 Springer-Verlag.