Circuit Reallocation Strategy Aware of the Physical Layer Effects for Elastic Optical Networks

Araújo, Sabrina Barros; Soares, André; Fontinele, Alexandre; Campelo, Divanilson R.; Jenior, Jose V. dos Reis; Barbosa, Ênio

doi:10.1109/iscc.2018.8538583

Cited by 3 publications

(6 citation statements)

References 17 publications

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“…In this case, the circuit reallocation tries to reorganize the optical spectrum to obtain contiguous frequency slots, avoiding that requests are blocked by fragmentation [Zhang et al 2014]. Recently, in addition to defragmenting the spectrum, the reallocation process has been used aiming to reduce the blocking caused unacceptable QoT [Araujo et al 2018, Araújo et al 2018.…”

Section: Circuit Reallocation Aware Of Plimentioning

confidence: 99%

“…The authors in [Araújo et al 2018] propose the called Circuit Reallocation Strategy -Physical Layer algorithm (CRS-PL). When the control plane identifies that some request can not be attended initially, this request is considered the Request of Imminent Blocking (RIB).…”

Section: Related Workmentioning

confidence: 99%

“…Degradation occurs due to Physical Layer Imperfections (PLI) and can make communication impossible, thus generating circuit blocking. These types of blocks related to QoT can be mitigated or even avoided by reallocating active circuits in the network, object of this work [Araújo et al 2018].…”

Section: Introductionmentioning

confidence: 99%

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Physical Layer-Aware Circuit Reallocation to Prevent Request Blocking in Elastic Optical Networks

Araújo¹,

Lacerda²,

Fontinele³

et al. 2023

Anais Do XLI Simpósio Brasileiro De Redes De Computadores E Sistemas Distribuídos (SBRC 2023)

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This paper proposes a new circuit reallocation algorithm that considers the effects of physical layer in transparent elastic optical networks, called Just One Circuit Reallocation (JOC).The JOC algorithm reallocates just one already established circuit to avoid the blocking of new circuit request due to impairments in the physical layer. The results of the JOC algorithm were compared to three other algorithms: Circuit Reallocation Strategy Physical Layer (CRS-PL), Circuit Reallocation for Block Reduction related to the QoT of the circuits (R-RQoT) and Make-Before-Break (MBBr). The reallocation algorithms are evaluated under the bandwidth blocking probability (BBP), circuit blocking probability (CBP) and the number of reallocated circuits (NRC) for USA and EON topologies. Besides, we also evaluated the performance of reallocation algorithms using Complete Sharing, K-Shortest Path Computation, Modified Dijkstra Paths Computation and K-Shortest Path with Reduction of QoTO to routing and spectrum assignment. Simulation results show that the proposed algorithm exhibits better performance than the CRS-PL, R-RQoT and MBBr algorithms with regard to BBP, PBC and NRC. In terms of BBP, our algorithm presented minimum reductions of approximately 65.36% e 55.6% for the USA and EON topology, respectively.

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Section: Circuit Reallocation Aware Of Plimentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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Physical Layer-Aware Circuit Reallocation to Prevent Request Blocking in Elastic Optical Networks

Araújo¹,

Lacerda²,

Fontinele³

et al. 2023

Anais Do XLI Simpósio Brasileiro De Redes De Computadores E Sistemas Distribuídos (SBRC 2023)

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“…Thus, an RMLSA solution is better than another if it consistently exhibits a lower blocking ratio for different scenarios. In wide-area dynamic EON, there are two primary sources of blocking: a lack of capacity to establish connections and the inability to provide an acceptable quality-of-transmission (QoT) to the network connection, despite capacity availability [5], [7], [8], [9]. The former case arises when there are effectively no available slots to meet the requested bandwidth or having available slots these cannot be used due to spectrum fragmentation, which occurs when the available slots are isolated and are discontinuos along the optical path or are not contiguous on the spectrum domain [10], [11].…”

Section: Introductionmentioning

confidence: 99%

“…Standard approaches to solve the RMLSA problem establish end-to-end all-optical communication (i.e., transparent) relying only on erbium-doped fiber amplifiers (ED-FAs) to compensate losses between source and destination nodes [5], [7], [8], [12], [13], [14], [15], [16]. In these cases, reach blocking has been the central problem in wide-area networks [5], [8], [7], [9]. This situation can be mitigated by increasing the maximum transmission reach of optical signals.…”

Section: Introductionmentioning

confidence: 99%

Impact of Amplification and Regeneration Schemes on the Blocking Performance and Energy Consumption of Wide-Area Elastic Optical Networks

et al. 2021

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This paper studies the physical layer's impact on the blocking probability and energy consumption of wide-area dynamic elastic optical networks (EONs). For this purpose, we consider five network configurations, each named with a network configuration identifier (NCI) from 1 to 5, for which the Routing, Modulation Level, and Spectrum Assignment (RMLSA) problem is solved. NCI 1-4 are transparent configurations based on all-EDFA, hybrid Raman/EDFA amplifiers (with different Raman gain ratio Γ R ), all-DFRA, and alternating span configuration (EDFA and DFRA). NCI 5 is a translucent configuration based on all-EDFA and 3R regenerators. We model the physical layer for every network configuration to determine the maximum achievable reach of optical signals. Employing simulation, we calculate the blocking probability and the energy consumption of the different network configurations. In terms of blocking, our results show that NCI 2 and 3 offer the lowest blocking probability, with at least 1 and 3 orders of magnitude of difference concerning NCI 1 and 5 at high and low traffic loads, respectively. In terms of energy consumption, the best performing alternatives are the ones with the worst blocking (NCI 1), while NCI 3 exhibits the highest energy consumption with NCI 2 Γ R = 0.75 following closely. This situation highlights a clear trade-off between blocking performance and energy cost that must be considered when designing a dynamic EON. Thus, we identify NCI 2 using Γ R = 0.25 as a promising alternative to reduce the blocking probability significantly in wide-area dynamic EONs without a prohibitive increase in energy consumption.INDEX TERMS Elastic optical networks, resource assignment, translucent configuration, transparent configuration.

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Realocação de Circuito ciente de Crosstalk para Redução de Bloqueios em Redes Ópticas Elásticas com Multiplexação Espacial

Araujo,

Soares

2024

Anais Do XLII Simpósio Brasileiro De Redes De Computadores E Sistemas Distribuídos (SBRC 2024)

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Este artigo propõe um algoritmo de realocação de circuito ciente do crosstalk (XT) entre núcleos para redes ópticas elásticas com multiplexação por divisão espacial. Diferentemente dos trabalhos na literatura que usam a realocação para desfragmentar o espectro, este trabalho realocar circuitos para mitigar o efeito de XT e evitar ou reduzir bloqueios na rede. O algoritmo é executado sempre que uma requisição está na iminência de bloqueio e, portanto, é considerado um algoritmo reativo. Além disso, o impacto da proposta é analisado em cenário de alocação de circuito com e sem ciência de XT considerando a topologia NSFNET e EON. É utilizada a técnica push-pull e fast-switching para migrar o tráfego dos dados, já que são técnicas que não causam interrupção de serviços. Em termos de probabilidade de bloqueio de banda, houve uma redução de pelo menos 30% com no máximo 0,25% dos circuitos ativos realocados por processo.

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Circuit Reallocation Strategy Aware of the Physical Layer Effects for Elastic Optical Networks

Cited by 3 publications

References 17 publications

Physical Layer-Aware Circuit Reallocation to Prevent Request Blocking in Elastic Optical Networks

Physical Layer-Aware Circuit Reallocation to Prevent Request Blocking in Elastic Optical Networks

Impact of Amplification and Regeneration Schemes on the Blocking Performance and Energy Consumption of Wide-Area Elastic Optical Networks

Realocação de Circuito ciente de Crosstalk para Redução de Bloqueios em Redes Ópticas Elásticas com Multiplexação Espacial

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