Research On Heterogeneous Spatial Information Network Fusion Based On SDN

The spatial information network is a heterogeneous network system composed of various communication devices,which is the backbone network of satellite network.With the expansion of the application,more and more heterogeneous networks are added,which aggravates the burden of the space information network,reduces equipment performance and the user's satisfaction.Reasonable partition can effectively improve network performance.Software Defined Network(SDN)is a new Network architecture.It separates the data plane of network equipment and control plane,eliminates the difference between devices and makes it easier to integrate heterogeneous network.Therefore,this thesis intends to apply SDN to spatial information network to study heterogeneous network integration.Firstly,this thesis studies the architecture and characteristics of spatial information network.A spatial layer controller selection algorithm is proposed for the periodicity change of spatial layer topology.The algorithm firstly divides the network area.Then,the satellite with the smallest time delay is selected as the controller.When the topology changes,the algorithm will select the controller satellite according to the change of topology.The simulation results show that the spatial information network combined with SDN can have better performance,which can reduce the transmission delay and packet loss rate of the whole space information network,and improve its throughput.At the same time,the subregional controller selection algorithm can reduce the time delay of the lower flow table to a certain extent,and the stability is better.Aiming at the problem of frequent switching between heterogeneous networks in spatial information network,and combining with SDN technology,this thesis proposes an algorithm for vertical switching of heterogeneous networks based on network calculus theory.The algorithm firstly divides the different network regions and assigns different weights to different businesses.Secondly,the RSS and network algorithms are combined to solve the users in multiple network coverage areas,because of the proximity of different network signal strength,and frequent switching occurs.The simulation results show that this strategy can effectively reduce the number of network switching,reduce the influence of network ping-pong switching,and improve the user experience.