The Experts below are selected from a list of 35352 Experts worldwide ranked by ideXlab platform
Martin Maier - One of the best experts on this subject based on the ideXlab platform.
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Total cost of ownership and risk analysis of collaborative implementation models for integrated fiber-wireless smart grid communications Infrastructures
IEEE Transactions on Smart Grid, 2014Co-Authors: Ramzi Charni, Martin MaierAbstract:Most previous total cost of ownership (TCO) studies give insight into the overall costs of various communications network architectures under the assumption of the traditional vertical integration model. However, it is necessary to take a closer look at the possibilities and gains achieved through collaboration. In this work, we develop a flexible, generic yet comprehensive TCO framework for the rollout of integrated fiber-wireless (FiWi) smart grid communications Infrastructures. Further, we propose a novel collaborative implementation model for a Shared Infrastructure for both broadband access and smart grid communications. In addition, we take into account that buildings currently shift from a product to a service (i.e, renewable power supply) and exploit the idea that housing companies may collaborate by offering surplus renewable energy to communications network providers across interconnected smart microgrids. We study the impact of our implementation model on TCO and compare it with the vertical integration model. We also conduct a sensitivity analysis for the key cost parameters and analyze the risks related to solar power intermittency and random fiber cuts in terms of power service penalty, fiber cut related costs, and TCO.
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Impact study of collaborative implementation models on total cost of ownership of integrated fiber-wireless smart grid communications Infrastructures
2013 IEEE International Conference on Smart Grid Communications SmartGridComm 2013, 2013Co-Authors: Ramzi Charni, Martin MaierAbstract:The majority of previous studies give good insight in the overall costs of various communications network architectures but most consider only the vertical integration model. However, it is necessary to take a closer look at the possibilities and gains through collaboration. In this work, we develop a flexible, generic yet comprehensive total cost of ownership (TCO) framework, which calculates the overall costs related to the rollout of smart grid communications networks for different scenarios. Further, we present our novel collaborative implementation model for a Shared Infrastructure for both broadband access and smart grid communications. In addition, buildings currently shift from a product to a service (i.e., renewable power supply). Thus, our idea is that housing companies will collaborate by offering the positive renewable energy to communications network providers. We study the impact of this model on TCO and compare it with tradionnal vertical integration model. The sensitivity analysis for the key cost parameters is conducted. We also analyze the risk related to renewable energy intermittency.
Ramzi Charni - One of the best experts on this subject based on the ideXlab platform.
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Total cost of ownership and risk analysis of collaborative implementation models for integrated fiber-wireless smart grid communications Infrastructures
IEEE Transactions on Smart Grid, 2014Co-Authors: Ramzi Charni, Martin MaierAbstract:Most previous total cost of ownership (TCO) studies give insight into the overall costs of various communications network architectures under the assumption of the traditional vertical integration model. However, it is necessary to take a closer look at the possibilities and gains achieved through collaboration. In this work, we develop a flexible, generic yet comprehensive TCO framework for the rollout of integrated fiber-wireless (FiWi) smart grid communications Infrastructures. Further, we propose a novel collaborative implementation model for a Shared Infrastructure for both broadband access and smart grid communications. In addition, we take into account that buildings currently shift from a product to a service (i.e, renewable power supply) and exploit the idea that housing companies may collaborate by offering surplus renewable energy to communications network providers across interconnected smart microgrids. We study the impact of our implementation model on TCO and compare it with the vertical integration model. We also conduct a sensitivity analysis for the key cost parameters and analyze the risks related to solar power intermittency and random fiber cuts in terms of power service penalty, fiber cut related costs, and TCO.
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Impact study of collaborative implementation models on total cost of ownership of integrated fiber-wireless smart grid communications Infrastructures
2013 IEEE International Conference on Smart Grid Communications SmartGridComm 2013, 2013Co-Authors: Ramzi Charni, Martin MaierAbstract:The majority of previous studies give good insight in the overall costs of various communications network architectures but most consider only the vertical integration model. However, it is necessary to take a closer look at the possibilities and gains through collaboration. In this work, we develop a flexible, generic yet comprehensive total cost of ownership (TCO) framework, which calculates the overall costs related to the rollout of smart grid communications networks for different scenarios. Further, we present our novel collaborative implementation model for a Shared Infrastructure for both broadband access and smart grid communications. In addition, buildings currently shift from a product to a service (i.e., renewable power supply). Thus, our idea is that housing companies will collaborate by offering the positive renewable energy to communications network providers. We study the impact of this model on TCO and compare it with tradionnal vertical integration model. The sensitivity analysis for the key cost parameters is conducted. We also analyze the risk related to renewable energy intermittency.
Raul Munoz - One of the best experts on this subject based on the ideXlab platform.
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virtualization of disaggregated optical networks with open data models in support of network slicing
IEEE\ OSA Journal of Optical Communications and Networking, 2020Co-Authors: Ramon Casellas, A Giorgetti, R Morro, Ricardo Martinez, Ricard Vilalta, Raul MunozAbstract:Network slicing has been a major selling point of 5G networks, where a slice is roughly defined as a self-contained logical network on top of a Shared Infrastructure tailored for a specific service or vertical industry, composed of heterogeneous resources (computing, storage, bandwidths) and typically involving specific application and/or networking functions. The relationship between the network slicing and the underlying network virtualization is an open research topic, allowing multiple deployment models. In particular, a specific model of interest involves the virtualization of the optical Infrastructure, where optical virtual networks are instantiated in support of network slicing, so the virtual network underlies and provides connectivity to component functions of a network slice. In this paper, we propose and implement a network virtualization architecture for open optical (partially) disaggregated networks, based on the concept of a device hypervisor relying on OpenROADM data models, in support of 5G network slicing over interconnected network function virtualization Infrastructure points of presence (NFVI-PoPs). The architecture is experimentally validated, showing the provisioning of ITU-T flexigrid network media channels across a virtualized network.
Raouf Boutaba - One of the best experts on this subject based on the ideXlab platform.
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paradigm based adaptive provisioning in virtualized data centers
Integrated Network Management, 2013Co-Authors: Rafael Pereira Esteves, Lisandro Zambenedetti Granville, Hadi Bannazadeh, Raouf BoutabaAbstract:Virtualized data centers host multiple applications with distinct objectives in a Shared Infrastructure. Accommodating several dynamic applications in virtual data centers is a challenging task for cloud providers. Current provisioning solutions focus on a limited set of objectives that may not be suited for the increasing number of applications deployed in data centers everyday. In this paper we propose an adaptive provisioning architecture for virtualized data centers based on allocation paradigms. A paradigm translates high-level application goals to objectives, allocator instances, and actions that actually provision customized virtual Infrastructures to applications. A paradigm policy language is defined to express the relationship between paradigms, objectives, and actions. A performance evaluation of the proposed approach considers four main aspects: acceptance ratio, provisioning cost, and CPU and link utilization. Simulation results show that our proposal is able to select the most appropriate set of allocation actions based on the particularities of the applications.
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svne survivable virtual network embedding algorithms for network virtualization
IEEE Transactions on Network and Service Management, 2013Co-Authors: Muntasir Raihan Rahman, Raouf BoutabaAbstract:Network virtualization can offer more flexibility and better manageability for the future Internet by allowing multiple heterogeneous virtual networks (VN) to coexist on a Shared Infrastructure provider (InP) network. A major challenge in this respect is the VN embedding problem that deals with the efficient mapping of virtual resources on InP network resources. Previous research focused on heuristic algorithms for the VN embedding problem assuming that the InP network remains operational at all times. In this paper, we remove this assumption by formulating the survivable virtual network embedding (SVNE) problem. We then develop a pro-active, and a hybrid policy heuristic to solve it, and a baseline policy heuristic to compare to. The hybrid policy is based on a fast re-routing strategy and utilizes a pre-reserved quota for backup on each physical link. Our evaluation results show that our proposed heuristics for SVNE outperform the baseline heuristic in terms of long term business profit for the InP, acceptance ratio, bandwidth efficiency, and response time.
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vineyard virtual network embedding algorithms with coordinated node and link mapping
IEEE ACM Transactions on Networking, 2012Co-Authors: Mosharaf Chowdhury, Muntasir Raihan Rahman, Raouf BoutabaAbstract:Network virtualization allows multiple heterogeneous virtual networks (VNs) to coexist on a Shared Infrastructure. Efficient mapping of virtual nodes and virtual links of a VN request onto substrate network resources, also known as the VN embedding problem, is the first step toward enabling such multiplicity. Since this problem is known to be NP-hard, previous research focused on designing heuristic-based algorithms that had clear separation between the node mapping and the link mapping phases. In this paper, we present ViNEYard-a collection of VN embedding algorithms that leverage better coordination between the two phases. We formulate the VN embedding problem as a mixed integer program through substrate network augmentation. We then relax the integer constraints to obtain a linear program and devise two online VN embedding algorithms D-ViNE and R-ViNE using deterministic and randomized rounding techniques, respectively. We also present a generalized window-based VN embedding algorithm (WiNE) to evaluate the effect of lookahead on VN embedding. Our simulation experiments on a large mix of VN requests show that the proposed algorithms increase the acceptance ratio and the revenue while decreasing the cost incurred by the substrate network in the long run.
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virtual network embedding with coordinated node and link mapping
International Conference on Computer Communications, 2009Co-Authors: N M M K Chowdhury, Muntasir Raihan Rahman, Raouf BoutabaAbstract:Recently network virtualization has been proposed as a promising way to overcome the current ossification of the Internet by allowing multiple heterogeneous virtual networks (VNs) to coexist on a Shared Infrastructure. A major challenge in this respect is the VN embedding problem that deals with efficient mapping of virtual nodes and virtual links onto the substrate network resources. Since this problem is known to be NP-hard, previous research focused on designing heuristic-based algorithms which had clear separation between the node mapping and the link mapping phases. This paper proposes VN embedding algorithms with better coordination between the two phases. We formulate the VN em- bedding problem as a mixed integer program through substrate network augmentation. We then relax the integer constraints to obtain a linear program, and devise two VN embedding algo- rithms D-ViNE and R-ViNE using deterministic and randomized rounding techniques, respectively. Simulation experiments show that the proposed algorithms increase the acceptance ratio and the revenue while decreasing the cost incurred by the substrate network in the long run.
Gee-kung Chang - One of the best experts on this subject based on the ideXlab platform.
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Radio-over-fiber access architecture for integrated broadband wireless services
Journal of Lightwave Technology, 2013Co-Authors: Ming Zhu, Liang-jie Zhang, Cheng Liu, Lin Cheng, Jing Wang, Gee-kung ChangAbstract:This paper introduces two radio-over-fiber (RoF) architectures for the future broadband optical-wireless access network—all-band RoF and band-mapped 60-GHz RoF that can be integrated in ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON). Legacy wireless services and multi-gigabit millimeter-wave (mm-wave) applications are integrated and delivered simultaneously under one Shared Infrastructure. With centralized system control and signal processing, the proposed systems provide cost-effective and protocol-transparent solutions for the next-generation multi-service bundle in heterogeneous networks (HetNets). In the all-band RoF network where wireless services are kept at their original carrier frequencies, Wi-Fi, WiMAX, and 60-GHz high-speed mm-wave services are transmitted based on subcarrier multiplexing (SCM) and dual-wavelength heterodyne beating techniques in avoidance of optical filters and large-bandwidth optoelectronic components. In the indoor environment, the band-mapped mm-wave RoF design is illustrated with real-time analog television signal, Wi-Fi, and high-speed digital baseband data—all of which are transmitted over unified optical and air links. By mapping various wireless signals into 60-GHz sub-bands, the novel architecture achieves higher spectral efficiency and lower power consumption.
