- 标题
- 摘要
- 关键词
- 实验方案
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A Performance Comparison of Centralized and Distributed Spectrum Management Techniques in Elastic Optical Networks
摘要： Elastic optical networks (EONs) have emerged to provide higher spectrum efficiency than traditional Dense Wavelength-Division-Multiplexing (DWDM) by utilizing enabling technologies such as flexible spectrum grid, Orthogonal Frequency Division Multiplexing (OFDM), and distance adaptive rate and modulation. The choice of the control-plane is an important consideration when deploying any new technology, especially in optical networks. This paper considers generic distributed and centralized spectrum assignment policies in conjunction with the accompanying connection set-up signaling protocols in EONs. A network simulator for Generalized Multiprotocol Label Switching (GMPLS) was developed with Forward Reservation Protocol and Backward Reservation Protocol signaling methods. These signaling techniques are used with the First Fit (FF) and Random Fit (RF) Routing and Spectrum Allocation (RSA) algorithms. The paper discusses control elements (central and distributed architectures) decisions under busy hour and normal network conditions and presents a comprehensive performance analysis of key performance metrics such as connection success rate, connection establishment time, and capacity requirement.
关键词： distributed control,signaling protocols,GMPLS,routing and spectrum allocation,centralized control,spectrum allocation,Elastic optical networks
更新于2025-09-23 15:22:29
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[IEEE 2018 26th Telecommunications Forum (TELFOR) - Belgrade, Serbia (2018.11.20-2018.11.21)] 2018 26th Telecommunications Forum (TELFOR) - Routing, Modulation and Spectrum Allocation in Elastic Optical Networks
摘要： Elastic optical networks are seen as an efficient solution for future optical networks. In these networks, the routing, modulation and spectrum allocation problem consists of finding an optimal network utilization by jointly addressing all three aspects. We examine two different approaches for solving this problem dynamically in a network with a variable traffic. The first approach uses several candidate shortest paths and allows dynamic spectral (re)allocation, while the second approach employs a genetic algorithm for finding the most appropriate path. Our results showed that the second approach could often provide lower average blocking probability and a more efficient spectrum utilization than the first one, particularly for networks with shorter links, indicating that it is a potential solution for future high capacity transport network.
关键词： Genetic algorithms,Routing modulation and spectrum allocation,Elastic optical networks
更新于2025-09-19 17:15:36
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Joint Optimization of FeICIC and Spectrum Allocation for Spectral and Energy Efficient Heterogeneous Networks
摘要： Cellular heterogeneous networks (HetNets) with densely deployed small cells can effectively boost network capacity. The co-channel interference and the prominent energy consumption are two crucial issues in HetNets which need to be addressed. Taking the traffic variations into account, this paper proposes a theoretical framework to analyze spectral efficiency (SE) and energy efficiency (EE) considering jointly further-enhanced inter-cell interference coordination (FeICIC) and spectrum allocation (SA) via a stochastic geometric approach for a two-tier downlink HetNet. SE and EE are respectively derived and validated by Monte Carlo simulations. To create spectrum and energy efficient HetNets that can adapt to traffic demands, a non-convex optimization problem with the power control factor, resource partitioning fraction and number of subchannels for the SE and EE tradeoff is formulated, based on which, an iterative algorithm with low complexity is proposed to achieve the sub-optimal solution. Numerical results confirm the effectiveness of the joint FeICIC and SA scheme in HetNets. Meanwhile, a system design insight on resource allocation for the SE and EE tradeoff is provided.
关键词： sleep mode,stochastic geometry,spectral efficiency,spectrum allocation,FeICIC,heterogeneous networks,energy efficiency
更新于2025-09-19 17:15:36
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - A Comprehensive Service Function Chainings Mapping Algorithm Based on Betweenness Centralities
摘要： To effectively solve the problem about how to map service function chainings (SFCs) in data center over elastic optical network (DC-EON), a comprehensive service function chainings mapping algorithm based on betweenness centralities (CSM-BC) is proposed, which aims at assisting the mapping of both virtual nodes and links in network function virtualization (NFV) scenarios, function (VNF) to virtual network corresponding deployments and virtual link routing with spectrum allocations, respectively. This proposed algorithm concurrently considers betweenness centralities of DC nodes, reuses of VNFs and comprehensive link weights in the substrate network to accomplish SFCs mapping. The simulation results indicate that CSM-BC deploys fewer VNFs and occupies less spectral units than existing algorithms.
关键词： Comprehensive link weights,Routing and spectrum allocation (RSA),Betweenness centralities
更新于2025-09-16 10:30:52
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Online service provisioning in elastic optical networks with hybrid algorithm for congestion aware routing and spectrum allocation
摘要： Elastic optical networks (EON) has received intensive research attraction due to its agile spectrum management in the underlying optical backbone infrastructure whose channels can be allocated on variable spectrum width. In this paper, a hybrid scheme is proposed for routing and spectrum allocation (RSA) in EON. An optimization formulation is modeled which takes into account the elastic bandwidth characteristics of optical paths as well as maintains a threshold congestion level on all links. The goal of the proposed model is to minimize the cost of using the network links which results in the minimum cost paths between node pairs. The proposed optimization model is solved offline in the initial stage to obtain routing information which is utilized for online traffic in the second stage. The proposed model is integrated with the spectrum allocation subproblem with the continuity and contiguity constraints. The computational time of the optimization model is shown to be in (time unit) seconds for different networks which is an acceptable time to obtain routing information in the initial stage. The proposed RSA scheme helps to efficiently reduce network blocking probabilities in different network scenarios as the optimization model manages to route traffic load to the underutilized links when the quality of service of lightpaths on the overutilized links meet the desired threshold congestion level.
关键词： Continuity constraint,Routing and spectrum allocation,Contiguity constraint,Blocking probability,Elastic optical networks
更新于2025-09-10 09:29:36