scholarly journals Network Blocking Probability Based Resource Allocation for Spectrum Fragmentation in Space-Division-Multiplexing-Based Elastic Optical Networks

2019 ◽  
Vol 8 (2S3) ◽  
pp. 1196-1199

Different examinations accept advised adjustable optical frameworks (EONs) with the purpose of developing the manual extreme alcove of focus frameworks. To accomplish this goal, it is capital to accord with the ambit ability diffusion affair brought about by ambit brokenness. Furthermore, due to the potentially top cartage demands in approaching frameworks, it is acute to administer requesting that care to be captivated agilely (quick reservation, IR) and as well those that can be absolved (early booking, AR). In frameworks that abetment the simultaneousness of IR and AR requests, IR advantage corruption by AR requests is aggravating affair back AR requests will all in all authority approaching resources, which makes a nonappearance of accepted assets accommodated IR inquires. As such, we abode the affair of ambit able and the alignment akin ascendancy of IR and AR requests by administering and ambit allocation (RSA).First, we abridge accompanying assay into EONs and ability appointment techniques for IR and AR inquires. Next, we adduce a atypical activating RSA action to abate ambit breach and ascendancy the alignment altitude of IR and AR requests in commendations to advice barter manual accommodation blocking probability(BBP) in EONs because the multiplexing aftereffect of spatial channels. Finally, we analysis the proposed adjustment accountable to PC proliferations and our after-effects authenticate that the proposed action can advance the BBP for the absolute cartage beck by abbreviating ambit irregularity, and also the alignment ascendancy of AR sales and IR requests beneath assorted framework conditions.

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 456
Author(s):  
Shengyu Zhang ◽  
Kwan Lawrence Yeung ◽  
Along Jin

We consider a space-division multiplexing elastic optical network (SDM-EON) that supports super-channels (SChs). A Sch comprises a set of contiguous frequency slots on multiple cores in a multi-core fiber. The problem of finding a lightpath using SChs involves routing, modulation, spectrum and core assignment (RMSCA). To minimize the request blocking probability (RBP), two critical issues must be addressed. First, routing and modulation assignment (RMA) should not cause hotspots, or overutilized links. Second, spectrum and core assignment (SCA) should aim at minimizing fragmentation, or small frequency slot blocks that can hardly be utilized by future requests. In this paper, a pre-computation method is first proposed for better load balancing in RMA. Then an efficient fragmentation-aware SCA is proposed based on a new fragmentation metric that measures both the spectral and spatial fragmentation. With the enhanced RMA and SCA, a joint load-balanced and fragmentation-aware algorithm called LBFA is designed to solve the RMSCA problem. As compared with the existing algorithms, simulation results show that our LBFA provides significant reduction in RBP.


2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sridhar Iyer

AbstractIn this article, we focus on the optimization of lightpath routing in an online Space Division Multiplexing-based Elastic Optical Network (SDM-b-EON) which is protected by the dedicated route protection (DRP) strategy. In view of the aforementioned, the Online Protection and Routing Algorithm with Regeneration (OPaRAwR) method is proposed which (i) protects the lightpaths through DRP, (ii) accounts for the presence of transceivers in the network, and (iii) ensures the routing of translucent lightpaths through the spectral super-channels over the spatial modes links. In regard to regeneration, we investigate two scenarios which differ in their regeneration variability level in addition to the adjustment of modulation formats (MFs) as per the transmission route characteristics. Extensive simulation experiments are conducted considering realistic transmission reach values and two realistic network topologies. The obtained simulation results demonstrate that the proposed OPaRAwR method significantly outperforms various reference techniques in terms of bandwidth blocking probability (BwBP). In addition, the results also show that significant benefits can be obtained in regard to the utilization of resources (spectrum and transceivers) with much lesser BwBP when the regeneration is conducted with complete flexibility and MF conversion is also permitted at every node of the SDM-b-EON.


2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sridhar Iyer

AbstractIn the current work, we focus on the optimization of lightpath routing in a Space Division Multiplexing based Elastic Optical Network (SDM-b-EON) for which we propose an online routing algorithm, named as Resource Efficient Online Routing Algorithm with Regeneration (REORAwR) which, in addition to ensuring the routing of translucent lightpaths through spectral super-channels over spatial modes links also accounts for the presence of the transceivers in the network. The proposed REORAwR algorithm is tunable such that it can either aim to reduce the bandwidth blocking probability or can aim to minimize the overall consumed power. In regard to regeneration, we investigate two scenarios which differ in their regeneration variability level in addition to the adjustment of modulation formats as per the transmission route characteristics. We conduct extensive simulations considering two realistic network topologies and realistic transmission reach values. The obtained results demonstrate that significant benefits can be obtained in regard to the utilization of both the major network resources (spectrum and transceivers) when regeneration is conducted with complete flexibility and modulation format conversion is also permitted at every node of the SDM-b-EON. In addition, the obtained results also show that when compared to spectrum usage, in terms of the overall consumed power, the performance profits which can be obtained in a translucent SDM-b-EON are very small.


Author(s):  
Silvana Trindade ◽  
Nelson Luis Saldanha Da Fonseca

This paper presents the work developed in the MSc. thesis entitled ”Resource Allocation in Space-Division Multiplexing-Based Elastic Optical Networks” which explores the resource allocation problem in Space-Division Multiplexing-based Elastic Optical Networks (SDM-EON). The proposed algorithms jointly address spectrum fragmentation, modulation format, crosstalk, and energy consumption. Results demonstrate that our algorithms increase the acceptance of requests for lightpath establishment while handling energy consumption, spectrum fragmentation, energy consumption, load balance, and crosstalk.


2021 ◽  
Vol 174 ◽  
pp. 102887
Author(s):  
Ruijie Zhu ◽  
Aretor Samuel ◽  
Peisen Wang ◽  
Shihua Li ◽  
Bounsou Kham Oun ◽  
...  

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