Design And Implementation Of 16-bit Protocol Stack Kernel Routing Forwarding Mechanism For Space-ground Integrated Network

The space-ground integrated network combines the space-based network composed of satellite nodes and the ground network to realize an information network with wide coverage,on-demand service and good ubiquitous access.However,the space-ground integrated network has the problems of limited node processing ability and resource constraints,and faces the challenges of prolonged link propagation,fast topology dynamic change,and poor security controllability.Therefore,terrestrial network technology cannot be directly applied to the space-ground integrated network,and it is urgent to innovate the network technology.Based on the idea of identity and location separation mapping,Identifier Network has obvious advantages in solving the technical challenges of network security and mobility in space network.In view of the problems existing in the space-ground integrated network,this thesis designs a 16-bit identifier address protocol and full matching routing forwarding mechanism under the space-ground integrated network architecture based on Identifier Network,according to the characteristics that the number of satellite network nodes is far less than the ground network and the resource of satellite network nodes is limited.A set of 16-bit identifier protocol stack for the core nodes of the space-ground integrated network is realized,which has the characteristics of simplicity,efficiency and high security.The specific work of this thesis is as follows :Firstly,this thesis introduces the architecture and characteristics of space-ground integrated network,expounds the related technical principles of space-ground integrated network based on identifier network technology and network protocol stack,and analyzes the design requirements of space-ground integrated network protocol stack kernel routing forwarding mechanism.Secondly,the protocol stack kernel routing subsystem,neighbor subsystem and dynamic routing protocol are designed and implemented under the overall architecture design of 16-bit protocol stack kernel routing forwarding mechanism.Based on identifier protocol and full-matching routing forwarding mechanism,the routing subsystem is designed to route packets.The kernel routing forwarding,the static configuration function of routing table and 16-bit identifier address packet routing process are realized,which simplifies the complexity of packet processing and routing.The neighbor subsystem is designed to maintain the mapping relationship between the identifier address and the physical address.The neighbor table,the static configuration function of the neighbor table,the identifier resolution protocol and the workflow of the neighbor subsystem are realized,which completes the sending process of 16-bit identifier packets.The dynamic routing protocol is designed for networking between satellite nodes,and the routing protocol dynamically maintains the routing forwarding of the kernel according to the topology change,which avoids the communication interruption caused by the topology change of the satellite network.Finally,a test environment is built to test the function and performance of the 16-bit protocol stack routing forwarding and dynamic routing protocol.The experimental results verify that the routing forwarding mechanism designed in this thesis can realize the complete receiving and sending process of 16-bit identifier address packets.The average routing forwarding delay is lower than the traditional network protocol stack,and the routing item memory occupancy is far lower than the traditional network protocol stack.The dynamic routing protocol designed in this thesis can dynamically maintain the routing forwarding of the kernel,and converge rapidly after topology changes,which provides routing for protocol stack forwarding data.