Abstract
The rapid growth of the technologies, high bandwidth applications, and cloud data centers consume heavy internet service. So, the consumer of the internet expects a high capacity medium for communication. The Elastic Optical Network (EON) provides a flexible and reliable transmission service for consumers. The spectrum fragmentation is a key challenge in EON. In simple terms, unaligned Frequency Slots (FSs) in the network are referred to as fragmented spectrum, while in defragmentation, the available FSs need to be rearranged to create room for the new connection requests. The problem in defragmentation occurs due to the lack of a continuous spectrum and it leads to depreciation in spectrum usage and simultaneously increasing the Blocking Probability (BP) which disrupts the majority of the existing connections in the network. Several techniques and approaches were suggested to reduce the possibility of disruption and reconfiguration in the network while defragmenting the frequency slots. This paper proposes a new algorithm to overcome the drawbacks and improvement in the quality of service of the network. The proposed algorithm holds the approach of proactive and reactive along with the meta-heuristic nature-inspired optimization technique called Jellyfish Search Optimization (JSO). The proposed combination, PR-DF-JFSO outperforms well in terms of spectrum utilization, network efficiency, and quality of service offered when compared to the state-of-the-art spectrum defragmentation algorithms according to the results of experiments done using standard quality metrics. The simulation results show the better utilization of spectrum, reduce the spectrum fragmentation complexity, better bandwidth fragmentation ratio, and overall connection blocking reduced.
Highlights
In this technologically advanced era, the internet has become inevitable almost in all sectors
The related papers mainly evaluate the various approaches and algorithms to improve the performance of spectrum defragmentation and spectrum allocation
Three standard quality metrics were considered to achieve the overall performance of the system under various scenarios
Summary
In this technologically advanced era, the internet has become inevitable almost in all sectors. As the internet got globally connected along all the edges of the world, it needs an efficient medium in terms of faster transmission, minimal data loss, and economics. Due to the global increase of internet users across the globe, the existing Dense Wavelength Division Multiplexing (DWDM) technologies cannot cope with the massive demand for bandwidth under a fixed grid. EON was introduced to fix and overcome this issue by managing the bandwidth, increasing the channel capacity, and efficiently utilizing the optical spectrum. In EON, the available spectrum is divided into small spectral pieces called Frequency Slots (FSs). Routing and Spectrum Allocation (RSA) plays a major role in EON for allotting and establishing a new connection to the network. Due to heavy traffic loads, RSA had become a quite challenging task to assign the frequency slots and routes without compromising the network efficiency and spectral utilization.
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