Research On Fault Recovery Strategy In LEO Satellite Network

Satellite network can cover all the place on earth, and because of the modern technology, satellite network will provide video service, image service, and voice service. Satellite network now is very important, has played an important role in a new generation of global mobile communication systems. Satellites connected by using the satellite links, inter-satellite links help to build the network, then satellite network can provide path checking and packet forwarding with inter-satellite links. LEO satellites network works as the access network connect with the other core network, LEO satellites network is the most important part of the whole networks. Link faults will happen frequently because of the satellite’s fault or the unbalanced loads of the nodes. The enemy will try to destroy satellites. Satellites work in the outer space, it is not easy to recover satellites in time. Therefore, research on how to deal with LEO satellite fault has very important significance.This research first describes the satellite network and the characteristics of the satellite network routing algorithm which frequently-used. And we analysis how the satellite faults influence the satellite communication. Then we find that different satellite links have different fault probability and establish a fault probability model, based on this model, improve the path calculation method, then proposes the fault avoid strategy. In view of the frequently used satellite network routing algorithm, puts forward the fault recovery strategy based on region partition for inter-satellite links. Satellite network fault cause bad influence, this strategy can control the influence in local area. Through what we have referred, we can raise throughput, and try to avoid the drop of packets. Finally, put forward the algorithm, then make the experiments. Then complete the simulation experiments on NS-2 platform, validate effectiveness of the methods that this paper propose. The fault recovery strategy based on region partition and the fault avoid strategy that this paper proposed, have important significance in the design and maintain of satellite network system.