On-demand dynamic placement method for SDN controllers in the space-ground integrated network

Abstract

The present invention relates to the field of satellite communication, in particular to a method for dynamically placing an SDN controller in a space-ground integrated network on demand, including: constructing an emergency satellite subnet according to the needs of emergency tasks, and determining a low-orbit satellite LEO satellite subnet S 0 ; Determine the maximum satellite-to-ground coverage time window and the time window value of satellite-to-terminal coverage, and calculate the coverage redundancy value N of satellite nodes; determine the satellite subnetwork S that satisfies redundant coverage according to N r ; Establish an optimization model based on network delay; use the approximate algorithm to solve the optimization model, and determine S r Where the controller is placed. The present invention sets the satellite node coverage redundancy based on the coverage window of the satellite to the task terminal, which can ensure the effective coverage of the task area; in addition, the network time delay is analyzed and modeled, and the model is solved using an approximate algorithm, which can satisfy the Optimize network latency while meeting network coverage requirements.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a method for dynamically placing an SDN controller in a space-ground integrated network on demand. Background technique [0002] The satellite network can cover extreme and remote areas. In the prevention and rescue of major natural disasters, it can dynamically form a network to support emergency services according to the coverage requirements, and integrate the satellite network with the ground network to build a space-ground integrated information network to support diverse space network requirements. It has become a new trend in the development of spatial information networks. The introduction of Software Defined Network (SDN) has further improved the scalability and flexibility of space-ground integrated networks. Facing the low-latency and high-reliability service requirements of emergency missions, multiple SDN controllers need to be deployed to achieve flexible mana...

AI Technical Summary

Problems solved by technology

However, the above-mentioned distributed controller placement scheme based on the satellite constellation design in the entire LEO layer can make full use of the low-latency characteristics of the LEO layer, but it needs to place a large number of satellite nodes as controllers to satisfy the association between controller nodes and switching nodes. cover

When the number of nodes increases and the dynamics increase, the control nodes need to be synchronized to maintain a global network view. At this time, a large number of signaling interactions between nodes will increase the network delay, which cannot well meet the low requirements of dynamic networking for emergency tasks. Latency requirement

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