ADAS: Adjust directional antenna with sensor hints

Recently, directional antenna has shown great potential to deploy in indoor environments and significantly improve wireless network capacity. Due to its directionality, the orientation of antenna becomes a critical issue especially for moving devices while exchanging data with directional AP. Previous work largely focused on scenarios, in which the clients are stable at most of the time and addressed the issue of moving device by remeasurement of the whole network information such as received signal strength, conflict graph. However, re-collection of such information will introduce significant overhead. To adjust directional antenna quickly and wisely in real-time, in this paper, we introduce ADAS, a system that adjust orientation of directional antenna with sensor hints from mobile devices. The key idea of ADAS system is to obtain the movement behavior and location information from sensors equipped in mobile devices, then the AP adapts its orientation accordingly. We implement ADAS system on commercial directional antenna and evaluate its performance under different configurations. The experiment results demonstrate that directional AP in ADAS system could adapt to mobility with less overhead.