Application Layer ARQ and Network Coding for QoS Improving in UAV-assisted networks

In this paper, we assess the efficiency of developed application layer automatic repeat-request (AL-ARQ) algorithm in UAV-assisted ad hoc network. We emulate HD video streaming using Ubuntu Mate 16 virtual machines, B.A.T.M.A.N. routing protocol, and NS-3 simulation tool. We cope with congestions at the relay node using COPE-like network coding implemented in the routing protocol. The relay node could be stationary like a copter or moving in circle like a fixed-wing drone. AL-ARQ demonstrated packet loss ratio PLR ave <; 0.01 for both scenarios for distances between nodes up to 400 meters. In both cases higher PLR ave caused more retransmissions at the application layer and gave more opportunities for network coding to encode packets at the relay node.