A Reliability-Amended-Based Controller Placement Method for LEO Satellite Networks

LEO satellite networks are becoming research hot and the utilization of software defined network (SDN) technology brings benefits in flexible network control. Controller placement is important for SDN-enabled networks. In this paper, the impact of delay and reliability on controller placement for SDN-enabled LEO satellite networks is analyzed firstly, following which a reliability-amended model is proposed based on programmable switches distributed on some satellites. The latency-reliability utility function and programmable switch-based enhanced controller placement algorithm are presented. Finally, the effectiveness of the proposed method is proved through simulation and the results show that about 10% reliability of controllers can be improved compared to that without amendment.