Validation of a point to multipoint cognitive radio transport protocol over GNU radio testbed

In this paper, we experiment on a GNU radio based platform a point to multipoint transport protocol specifically designed for cognitive radio environments. Over a dedicated software defined based platform deployed in our premises we investigate two main functionalities of transport protocols in terms of reliability and congestion control. Comparing with state of the art point to multipoint and even the TCP protocol as a benchmark, we show that our solution ensures high reliability and reacts judiciously to losses caused by interference. Moreover, our transport protocol is able to follow network conditions and channel switching by adapting its sending rate accordingly. Our extensive experiments also highlight that our solution is not only able to manage multiple destinations but also capable to offer better performance than TCP in terms of throughput over lossy links.