Performance analysis of in-band full duplex collision and interference detection in dense networks

The densification of wireless networks that contend for a shared medium, demands improved MAC solutions that can reduce the energy cost of packet collisions. In this paper we analyze a novel in-band full duplex collision and interference detection scheme for dense networks, studying the energy savings that it can bring with respect to the performance of half duplex communications. Under a high external interference scenario, results show that the proposed full duplex scheme is more energy-efficient than half duplex transmissions for any network density. When the interference is low, the full duplex scheme provides energy gains when the number of contending devices is above a critical value. Expressions for calculating this critical number of devices are provided, showing that it is smaller when the likelihood of collisions increases. In the studied cases, results show the energy savings grow exponentially with the density of the network.