Research on Backbone Routing Protocol of Ad Hoc Network Based on SDN

In recent years, with the development of Internet of Things and UAV network, Ad Hoc networks have increased the number of nodes, enhanced node mobility, and become more sensitive in delay. However, the existing Ad Hoc network routing protocols have some disadvantages, such as high signaling overhead, slow response speed and slow convergence speed. In order to improve the efficiency of routing protocols, we propose a backbone routing protocol based on SDN (software defined network). The core idea of the protocol is as follows. Firstly, there is a logical centralized controller to implement the control plane strategy such as backbone node selection algorithm, and the centralized controller can switch between deep control and shallow control flexibly according to the network state. Secondly, the backbone nodes exchange control signaling, and other nodes transmit data through the backbone nodes, which can reduce the signaling cost and ensure the response speed and convergence speed of routes. Simulation results in multiple topologies show that the centralized backbone routing protocol significantly reduces the overhead of establishing routes and improves the throughput.