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Transport IP/optical networks are evolving in capacity and dynamicity configuration. This evolution gives little to no attention to the specific needs of applications, beyond raw capacity. The ACINO concept is based on facilitating applications to explicitly specify requirements for requested services in terms of high-level (technology agnostic) requirements such as maximum latency or reliability...
Network operators have worked in interoperable scenarios for transport network from several years. The main motivation is to have a rich ecosystem, which encourages the competition to have more efficient network solutions. The bandwidth increment in the transport network puts a lot of pressure to have revenues on an environment where the end-user is willing to pay less and less for the service. Software...
The main aim of this paper is to identify the main causes for the delays in the Portuguese construction industry and its impact, with the purpose of increasing knowledge on the causes and impacts of delays in construction projects. The Relative Importance Index was adopted to classify the importance of the 47 causes and six impacts identified causes of delays. Results show the main causes of delay...
The paper proposes a novel information model to represent elastic capability of the network, E2E and intra-domain routing algorithms. Simulation results on relevant network show the solution efficiently combines DC and traditional operator services, with no impact on the complexity.
Optimization algorithms are a valuable tool for decision makers looking at different technological options and future traffic estimates. In order to quickly and accurately analyse multiple what-if scenarios, these algorithms need to balance solution quality and scalability. In this paper, we look at the specific case of multi-period planning in a transport network featuring SBVTs. We analyse the performance...
We evaluate the impact of electrical switching capacity on the cost-efficiency of SBVT-enabled backbone networks through a novel grooming and equipment provisioning algorithm. The results stress how the switch design is critical in balancing client-card and switch matrix costs.
This paper describes the requirements and challenges on WAN due to NFV in case of datacenter interconnections crossing heterogeneous domains for technology, control and vendors. It is presented a new architecture with novel functional building blocks between transport and service layers named E2E harmonization. Such architecture allows efficient virtualization for the service layer including novel...
Although there is perhaps an acceptance that EON has benefits, there is a debate about whether a full flexgrid implementation is required to achieve those benefits. Current industry debate addressed in this paper relates to when is the most appropriate time for carriers to: (a) install flexgrid ready components, and (b) enable them and start using the technology.
Integrated DWDM ports in routers reduce the CAPEX investment, but control plane complexity is increased as the IP transponder becomes part of the optical domain. This work demonstrates the control plane interoperability between the IP and the optical vendors.
This paper describes a demonstration of SDN-based optical transport network virtualization and orchestration. Two scenarios are demonstrated: a dynamic setup of optical connectivity services inside a single domain as well as a multidomain service orchestration over a shared optical infrastructure using the architecture defined in the STRAUSS project.
The IDEALIST (Industry-Driven Elastic and Adaptive Lambda Infrastructure for Service and Transport Networks) project has designed and implemented a Generalized Multi Protocol Label Switching (GMPLS) control plane for flexi-grid optical Dense Wavelength Division Multiplexing (DWDM) networks, providing significant input for IETF standardization. The control plane supports delegating the path computation...
In an evolutionary metro network scenario, it is proposed to adopt flexi-grid technologies and centralize the IP functionality, locating the Broadband Remote Access Servers (BRASes) in fewer sites of a regional photonic mesh network, in order to reduce CapEx. Therefore, cost-effective data plane solutions, able to support multiple low bit rate connections, using 12.5 GHz channels, are required for...
Multi-layer restoration enhances recovery in multiple failure scenarios and can relax the urgency of the reparation of damaged network equipment. This work analyses the operational expenditures (OpEx) savings obtained with multi-layer restoration.
The article proposes a hierarchical routing approach, validated by simulation on real network operator, based on a novel adaptive virtualization scheme, suitable for transport SDN, allowing dynamic configuration of heterogeneous multi-domain packet-optical networks.
This work analyses the OpEx savings related to stock of spare parts for Sliceable Bandwidth Variable Transponders versus traditional fixed rate transponders. Target cost of sliceable transponders based on these OpEx savings is obtained.
Jemula802 is a simulator developed by Disney Research for the standard IEEE 802.11, more specifically 802.11a/g. Jemula802 is used for simulations on scenarios related with Theme Park deployments. This paper describes the progress of the design and implementation of the IEEE 802.15.4 over Jemula. Jemula802.15.4-adaptation transforms Jemula802 (simulator of IEEE 802.11 standard) into the IEEE 802.15...
The current generation of optical networks based on a fixed wavelength grid and on fixed-rate transponders would impose relevant limitations for future transmission rates exceeding 100 Gb/s, thereby limiting the number of potential implementations and making a new generation of elastic optical networks (EON) necessary. To this regard, flexible-grid (Flexgrid) transmission and switching technologies...
This paper first identifies a realistic expectation of modulation formats for the next 10 years and quantifies the possible capacity gains. It is studied when the capacity using fixed grid is exhausted and studies several evolution strategies towards flexi-grid. Results show the capacity will be exhausted by 2019 and by applying flexi-grid the network life can be extended five years. A shorter-term...
Elastic Optical Networking (EON) is a solution that promises to improve infrastructure utilisation by implementing flexible spectrum allocation with small spectrum slots instead of the rigid 50-GHz fixed grid of current DWDM deployments. This new EON flexible grid supports Bandwidth Variable Transponders (BVT) that can tune their bit rate and bandwidth dynamically with a trade off between reach and...
Orchestration between multiple layers requires a standard architecture to enable such coordination in multi-vendor scenarios. This work proposes an architecture to solve multi-layer orchestration and experimentally validates topology dissemination in a multi-vendor environment.
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