Research On The Routing Scheme For SDN-Based Satellite Network With Content Nearby-Delivery

High-throughput,high-reliability and wide-area interconnection has become the important trend in the development of 5G and 6G mobile communication technologies.3 GPP proposed the NTN proposal for satellite and 5G convergence in R16,aiming to promote the global co-ordination of worldwide communication networks.The enhanced mobile broadband scenario urgently requires a seamless,large-bandwidth communication technique,and satellite network will play an important role for achieving global coverage without the limitation of geographic conditions.However,the research on the new generation of satellite communication network is still confronted with some fundamental challenges including low scalability,large end-to-end delay,resource waste of the same content transmission,and so on.In response to these problems,this thesis innovatively proposed a satellite network architecture based on SDN and in-network cache to realize the integration of transmission,control,storage and service of multi-track hybrid satellite networks.In this thesis,we propose a novel satellite network architecture that jointly considers SDN and ICN.This integrated architecture named SDSN-C can shorten the contents obtaining path for users by introducing in-network cache from ICN,and reduce the transmission delay by deploying routing strategy based on SDN.In order to optimize the utilization of bandwidth resources,we also defined a new routing scheme named RSIC based on SDSN-C,which implements adaptive routing control with in-network cache and ant colony routing optimization algorithm with multiple QoS restrictions.Finally,we built the satellite network scenario by STK and OPNET to simulate the routing algorithm proposed in this thesis.The simulation results show that the proposed algorithm reduces the end-to-end delay by 16.7%and 37.5%compared with DFS and DSP algorithms,and has advantages in terms of packet drop ratio and throughput.