Implementation and Demonstration of Unified Link-Layer API

The characteristics of wireless links can change abruptly leading to challenges in achieving stable application behaviour. However, no common link-layer independent interface is available to monitor and control wireless links in a convenient and technology-independent way. Instead, only solutions handtailored for particular technologies or higher-layer middleware is used today. In this poster we introduce the Unified Link-Layer API (ULLA) that allows technologyand platform-independent access to wireless devices to control configurations, monitor the performance, and register for event notifications. Hereby ULLA enables efficient cross-layering for diverse applications. We also describe two prototype implementations, based on Linux and Windows CE and will demonstrate the latter one together with a network monitoring tool.