Design And Simulation Of A Strategy For Backbone Node Deployment In Space Information Networks

As the vital nexus between the integrated information systems of land, ocean, air and sky, Space Information Networks (SIN) is an all-around information network system, and of great social, economic and military value. SIN whose node types are heterogeneous is a complex system which consists of multifarious equipments. It is a great challenge to deploy and plan it.Based on the analysis of the characteristics of SIN and its backbone node deployment need, a backbone node deployment plan combined with Particle Swarm Optimization (PSO) is put forward in this thesis, which accommodates SIN. It classifies the backbone nodes of the network into space backbone nodes and backbone nodes on the ground in accordance with their spatial location. The strategy for space backbone nodes is designed to maximize the joint coverage rate of the backbone node set of the network space using the strategy of static configuration, and the strategy for backbone node deployment on the ground is carried out in each target region dependently which combines the static configuration and dynamic adjustment. In the network initialization phase, the backbone nodes on the ground is configured statically in order to minimize average transmission hops from nodes of the mission region to the backbone node taking communication coverage and the transmission efficiency of the network operation into account. In the network operation phase, the location of the backbone nodes is dynamically updated to form an optimal trajectory of the backbone node on the ground in reference to the distribution of data in the mission region.Network simulation software is used to simulate the strategy in this thesis, the simulation results of the proposed the strategy for backbone node deployment show that it can obtain larger communications coverage with the same number of backbone nodes ensuring the stability of the communication. The strategy for backbone nodes deployment on the ground can enhance network performances without giving rise to a larger control overhead compared with the strategies for static deployment and random move deployment, so the strategy is suitable for applying to space information networks.