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Sökning: L773:0733 8724 > Lunds universitet

  • Resultat 1-3 av 3
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1.
  • Gong, Xiaoxue, et al. (författare)
  • Virtual Network Embedding for Collaborative Edge Computing in Optical-Wireless Networks
  • 2017
  • Ingår i: Journal of Lightwave Technology. - 0733-8724. ; 35:18, s. 3980-3990
  • Tidskriftsartikel (refereegranskat)abstract
    • As an open integrated environment deployed with wired and wireless infrastructures, the smart city heavily relies on the wireless-optical broadband access network. Smart home data are usually sent to neighbor optical network units (ONUs) through front-end wireless mesh networks (WMNs) and finally reach the optical line terminal (OLT) for decision making via the passive optical network (PON) backhaul. To reduce backhaul bandwidth saturated by this conventional approach, smart edge devices (EDs) should be deployed at sensors and ONUs so that collaborative edge computing can be performed in front-end WMNs. Moreover, the cooperation of EDs at different ONUs is also promising for computing tasks that cannot be handled within front-end WMNs due to the local bottleneck, leading to collaborative edge computing in the PON backhaul. In this paper, network virtualization is utilized to support the coordination of computing and network resources. We also describe the relationship between virtual networks and requirements of computing tasks for substrate resources. First, a graph-cutting algorithm is employed to embed as many virtual networks as possible onto the common network infrastructure in front-end WMNs, aiming at minimizing the total transmitting power. Next, we transform impossibly embedded virtual networks into new ones that must be processed through the PON backhaul where the wavelength consumption will be optimized. Simulations results demonstrate that 1) the total transmitting power assigned for nodes is effectively reduced using the graph-cutting algorithm if all computing tasks can be solved by front-end WMNs; 2) otherwise, our method accepts more virtual networks with the improvement ratio of 77%, through the PON backhaul. In addition, there is a good match between the algorithm result and the optimal number of consumed wavelengths per optical fiber cable.
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2.
  • Klinkowski, Miroslaw, et al. (författare)
  • Joint routing and wavelength allocation subject to absolute QoS constraints in OBS networks
  • 2011
  • Ingår i: Journal of Lightwave Technology. - 0733-8724. ; 29:22, s. 3433-3444
  • Tidskriftsartikel (refereegranskat)abstract
    • From the network layer perspective, the problem of burst losses is one of the most challenging problems which restrain the development of optical burst switching (OBS) networks. Indeed, OBS is a buffer-less technology and the consequent lack of guarantees for data delivery may affect significantly the quality of service (QoS) perceived by end users. To overcome these obstacles, dedicated network mechanisms and design methods are required for QoS provisioning in the network. With this end in view, in this paper, we present a traffic engineering (TE) approach to support the end-to-end traffic delivery with absolute QoS guarantees, in terms of burst losses, in an OBS network. We focus on the establishment of explicit routing paths and minimum allocation of wavelength resources in network links under the requirement that certain absolute level of burst loss probability for a given set of traffic demands is guaranteed. In this paper, we call such an off-line problem the virtual topology (VT) design problem. Since the VT design problem is NP-complete, as an alternative to the mixed integer linear programming formulation, we develop a local search heuristic algorithm to solve it. Moreover, we focus on a dynamic OBS network scenario, where the offered traffic is subject to a change. In this context, we propose an on-line VT maintenance mechanism that is responsible for traffic admission control and adaptation of the VT to traffic changes. Eventually, proposed algorithms and mechanisms for the TE-driven end-to-end QoS approach are verified both numerically and by means of network simulations for a number of network scenarios.
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3.
  • Lundin, Richard (författare)
  • A General Power-Series Expansion Method for Exact Analysis of the Guided Modes in an Optical Fiber
  • 1986
  • Ingår i: Journal of Lightwave Technology. - 0733-8724. ; 4:11, s. 1617-1625
  • Tidskriftsartikel (refereegranskat)abstract
    • A power-series expansion method for rigorous analysis of the guided modes in a cylindrical, radially inhomogeneous, dielectric waveguide is presented. The method is developed for an arbitrary piece-wise polynomial permittivity profile. The field solutions of the inhomogeneous core are constructed by a sequence of power-series expansions. Convergence is ensured and accuracy maintained by regulating the distance between successive expansion points. The characteristic equation and the cutoff conditions are expressed in a unified manner as a set of functions. The method presented is competitive in terms of accuracy achieved and computing time required.
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  • Resultat 1-3 av 3
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Pioro, Michal (1)
Lundin, Richard (1)
Gong, Xiaoxue (1)
Guo, Lei (1)
Shen, Gangxiang (1)
Tian, Guoda (1)
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Klinkowski, Miroslaw (1)
Careglio, Davide (1)
Sole-Pareta, Josep (1)
Pedroso, Pedro (1)
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