无人机辅助通信的密集无线网络MAC协议

Facing the dense wireless network communication scene assisted by unmanned aerial vehicles (UAVs), Aiming at the problem of a limited network throughput caused by transmission of fixed base stations on the ground, and focusing on the improvement of communication network performance within the coverage of UAVs, a UAV Assisted Dense network Medium Access Controlprotocol (UAD-MAC) is proposed.First, based on the heterogeneous communication of different devices in a dense network, we propose a novel UAV assisted dense wireless network communication model.Second, the concepts of initial competition window coefficient, sub-coefficient and their weights are introduced.We design a new MAC protocol by combining the design of the initial contention window and the nodes quitting probability in UAV mobile environment.Finally, a three-dimensional Markov model is used to evaluate the normalized saturated throughput and access fairness, and then we determine the sub-coefficient weights of the initial contention window to maximize the throughput. Simulation results show that the average normalized saturated throughput of the UAD-MAC protocol is nearly doubled under the basic access mechanism and increased by about 51% under the RTS/CTS mechanism compared with the existing protocol.Moreover, the loop with a smaller access time can obtain a higher throughput and lower delay.