Research On P-cycle Configuration Algorithm In Optical Network

With the development of economy and technology, the demand of People for information isincreasing sharply，which requires that communication networks can provide greater capacity andhigher quality service, optical network is the best choice. P-cycle is one of the protection methodsof optical network survivability which can provide faster speed of recovery with lower resourceredundance.The author analyses the method of generating candidate p-cycles and the method of assigningspare capacity for p-cycles particularly. The classical method Grow chooses all of the expandedcycles as the candidate p-cycles which will make a minus impact on candidate cycles’ quality. Sothis paper puts forward a new method called FastGrow which will choose the cycle which have agreater AE as candidate cycle. The simulation results which is operated on the COST239networktopology show that FastGrow can reduce the number to half when compared with Grow method,and the average AE of candidate cycles can increase by0.408and the p-cycle’s average coveragecan increase by10%. The classical method of assigning spare capacity is CIDA which needgenerate many candidate cycles before assignment which will increase calculate time. So this paperputs forward a new method called FCOA which needs only one step to assign spare capacity forp-cycles. The simulation results which is operated on the COST239network topology show that thecalculate time of FCOA is reduced to1/8when compared with CIDA, and FCOA has a highernetwork resource utilization ratio, however FCOA can Equilibrium network load at the same time.