时频双域碎片感知的虚拟光网络资源分配算法OA

To address the resource fragmentation problem caused by the mismatch between traditional wavelength division multiplexing(WDM)spectrum allocation mechanisms and the dynamic characteristics of virtual optical networks,this paper proposes a time-frequency dual-domain fragmentation-aware(TFD-FA)resource allocation algorithm.Considering the dynamic arrival and departure of virtual network requests,a spectrum fragmentation evaluation mechanism is established,along with a spectrum block selection strategy.Furthermore,a novel time-domain fragmentation quantification model is constructed,where time variance is used to measure the degree of fragmentation,and time-slot continuity is optimized based on service lifetimes.A joint time-frequency constrained optimization model is then developed to collaboratively perceive fragmentation in both spectrum and time dimensions,balancing their respective continuity requirements in resource allocation.Simulation results demonstrate that,compared with load balancing and time-frequency fragmentation-aware algorithms in elastic optical networks,the proposed algorithm improves the acceptance rate of virtual optical network requests by 7.5%,increases physical network resource utilization by 4%,and enhances network revenue by 6.97%,thereby effectively optimizing resource allocation efficiency.