Spectrum and Routing Allocation Method for Elastic Optical Networks Based on Posterior Blocking Probability Measurement

Abstract

With the rapid growth of traffic in today's society, the original optical network based on wavelength division multiplexing is more and more difficult to meet the current traffic demand because of its large spectral granularity, so the elastic optical network came into being. In elastic optical networks, the most important research issue is the allocation of spectrum and routing. This paper proposes a joint allocation method of spectrum routing based on access blocking rate. The value of spectrum slot is measured by the access blocking rate of spectrum slot, and it is converted into the weight of the link. The weighted shortest path algorithm is used to find the appropriate allocation Path; and find the best allocated spectrum slot on the assigned path by a posteriori access blocking rate. Then considering the shortcomings of the above algorithm without considering the peripheral link, a spectrum routing joint allocation algorithm that considers the neighboring link a posteriori access blocking rate is proposed. Finally, the above two algorithms are compared through experiments. Compared with the classic first fit algorithm, more than 10% service blocking rate is reduced in both USNET and NSFNET network topologies.