Research On Ring Protection Technology In Integrated Space-Ground Optical Network

Serious natural disasters will cause widespread damage to terrestrial optical fibers,but it is difficult to use existed terrestrial optical survivability technologies to restore the damaged traffic quickly.The integrated spaceground optical network is based on the terrestrial optical network,and extends the network into space through the satellite-ground and intersatellite laser links.It is the integration of the terrestrial optical network and the satellite optical network.When the terrestrial optical network is seriously damaged,satellite laser links are used to restore damaged traffic and ensure emergency communication.Compared with the terrestrial optical network,the satellite optical network has always been in periodic motion,and the satellite laser link and the optical fiber link also have differences in connection characteristics and capacity characteristics.This paper studies the ring protection technology in integrated space-ground network,research work and innovations mainly include the following aspects:(1)Propose an algorithm based on generation and expansion technologies of preconfigured-cycle(p-cycle)against share risk links group(SRLG)failures in the integrated network.The algorithm combines the structural characteristics of the integrated network,and the generated p-cycle has better protection efficiency against SRLG failures.(2)Construct space-ground integrated optical network architectures based on geosynchronous orbit satellite network and low-orbit satellite network respectively.On this basis,simulation analysis is carried out,and a satellite-ground link access strategy with the least number of handovers per unit time is formulated to keep the chain,which can road stability and reduce computational complexity.(3)Propose corresponding p-cycle protection technologies and apply integer linear programming(ILP)models for simulation in two integrated networks.According to the simulation results,p-cycle technologies will cause significant performance improvement in the total consumption of work protection resources,protection resource redundancy and protection success rate in both integrated space-ground network compared to p-cycle protection scheme used in traditional terrestrial optical network and the improvement ranges from 10%to 30%.Total consumption of work protection resource and protection resource redundancy in LEO integrated network are higher than those in GEO integrated network,but the LEO’s scheme still has advantages of short link distance and high communication quality.