Abstract
The space division multiplexing elastic optical networks (SDM-EONs) based on multi-core fiber (MCF) are an effective solution to improve transmission capacity. In SDM-EONs, spectrum resources take on three-dimensional (3D) properties (i.e., frequency, time, and space), which brings new spatial constraints to network resource allocation. Meanwhile, the spectrum fragmentation in the network also presents same characteristics with the setup and release of dynamic lightpath. To improve the success rate of transmission and the utilization of network resources, it is necessary to evaluate network fragmentation effectively from the three dimension. Therefore, this paper focuses on a new fragmentation measurement for SDM-EONs. Firstly, the 3D fragmentation metric is carried out considering the frequency-time-space domain. Then, routing, core, and spectrum allocation (RCSA) scheme is proposed to allocate the spectrum resource with minimal future fragmentation and core resource with maximal free resource reservation. Simulation results show the proposed scheme better in blocking probability, spectrum utilization, and fragmentation rate.
Highlights
Many high-traffic applications have emerged over the Internet with the rapid development of big data, cloud computing, and 5G mobile communication
SIMULATION SETUP AND RESULTS we evaluate the performance of our ASFR-RCSA and Fragmentation Measure Metric (FMM)-RCSA in terms of blocking probability, spectrum utilization, and fragmentation rate
In this paper, we study the issue of the complex 3D fragmentation in SDM-elastic optical networks (EONs)
Summary
Many high-traffic applications have emerged over the Internet with the rapid development of big data, cloud computing, and 5G mobile communication. To achieve higher transmission capacity, SDM-EONs with 3D resources such as frequency, time, and space domain arise at the historic moment based on multi-core fiber (MCF), which are considered to be an effective solution [14]–[16] in the future. A combined 3D fragmentation metric is provided, called the ‘‘available spatial fragmentation rate’’ (ASFR) This is a new way to measure the 3D fragmentation of SDM-EONs with frequency-domain spectrum resources, time-domain request remaining time, and space-domain core resources. The proposed RCSA scheme (FMM-RCSA) selected the path with a large degree of fragmentation first for the connection requests by calculating FMM, avoiding the generation of fragmentation This measurement only considered the current state of spectrum occupation in the network, not future fragmentation caused by the remaining time and not occupied core resources. We can focus on 3D fragmentation metric-ASFR
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