A satellite network based on distributed SDN and its construction method

Abstract

The invention discloses a satellite network based on distributed-type SDN and a construction method thereof, wherein the satellite network adopts a GEO / MEO / LEO three-layer satellite network model. The invention proposes a distributed-type software defined satellite network DSDSN network for the GEO / MEO / LEO three-layer satellite network and proposes a controller system configuration strategy for the same-layer satellite cluster based on the controller clustering technology. The strategy is based on the ideas of an ant colony clustering algorithm and through the selection of appropriate control nodes, the position and number of the controllers can be properly configured; the communication nodes can be deployed according to the formed controller cluster so as to reduce the total delay from the communication nodes to the neighboring controller node. The centralized management of the invention has a global view of all the nodes in the entire network, can grasp the status of satellite nodes and improve the survivability of the network. The invention reduces the routing cost by optimizing three parameters of the link connection duration, the total delay and the satellite resources.

Description

technical field [0001] The present invention relates to a satellite network, in particular to a distributed software defined satellite network (Distributed Software Defined Satellite Network, DDSSN for short). Background technique [0002] The traditional satellite network usually adopts the communication method of bent pipe transparent forwarding, forwarding all the data packets from the sending terminal to an intermediate station, and then from the intermediate station to the receiving end via the relay satellite. This approach simplifies the structure of the payload in satellite communications, but at the same time it also leads to an increase in delay. In recent years, the emergence of some new technologies has greatly promoted the development of satellite networks, such as on-board processing (On-board Processing, OBP), inter-satellite link (Inter-satelliteLink, ISL), etc. The communication time of the satellite network is extended, the load of the ground communication...

AI Technical Summary

Problems solved by technology

[0004] At present, some researchers have proposed a satellite network based on a single SDN controller, in which the controller is placed on the ground, and the calculation and configuration of the entire route is generated by the ground station (GS) and the network operation control center (NOCC). Execution, this kind of network deploys only one controller on the ground, which will cause unbearable long delay problems, and once the controller fails, the entire network will collapse, and the invulnerability is not good

Some researchers have also proposed a space-space-ground integrated multi-layer satellite communication system, but this system does not study the controller system, and still cannot solve the problem of excessive delay

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