To provide broadband Internet connectivity to passengers in a high speed train， we study a network system using infrared communication and mobile IP technology. In particular， we analyze appropriate network topologies by simulations and develop a handover method with fewer packet loss.
Fast and accurate infrared beam tracking
To improve the performance of infrared train communication system， it is required to achieve accurate and fast tracking of the infrared beam emitted by the peer device. We investigate faster handover with CMOS camera.