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Big data analytics is applied for IP traffic prediction. When the virtual topology needs to be reconfigured, predicted and current traffic matrices are used to find the optimal topology. Exhaustive simulation results reveal large benefits.
We propose a survivable routing and resource assignment scheme with MPP and SRLG in VON to get less resources consumption and enough protection against physical failure. 29% reduction in resource consumption can be achieved.
We present a framework able to limit the device lifetime degradation in optical backbone networks using sleep-mode-based green strategies. Results show that our approach manages the lifetime while not compromising significantly the energy saving performance.
An experimental demonstration of a mechanism that composes on-demand virtual infrastructures over multi-domain multi-technology transport networks is presented. The integration of a virtualization and replanning algorithms within an end-to-end orchestration and virtualization platform is proposed.
We propose to realize availability-aware service provisioning in EONs with FIPP-p-cycles and bandwidth-squeezed restoration. Simulation results show that the proposed schemes are more reliable and spectrum-efficient than the existing approach.
For the first time, re-provisioning is introduced into advanced reservation enabled optical transport networks as a novel perspective for optimization. Demonstration results show parallel service re-provisioning (PSRP) can improve the efficiency of network resource significantly.
With the continuous growth of internet, mobile and cloud computing services, the network traffic in data centers (DCs) is drastically increasing. According to recent estimates 76% of this traffic exists within the DC itself; hence the DC network should be able to handle huge amounts of data while enabling connectivity of any server-to-server. In the traditional DC network, the widely deployed high-capacity...
A hierarchical cache architecture for the telecom cloud is investigated. Intermediate cache (IC) nodes, placed in geographically distributed datacenters, are interconnected through permanent “per content provider” (CP) virtual network topologies (CP-VNT), whilst leaf cache (LC) nodes are placed close to users. CP's video contents are replicated in the IC nodes through the CP-VNTs, whilst LC-to-IC...
Optical wireless network has the potential to serve both data centers and metropolitan area networks. Free space optical networks has one dimension that is not encountered in fiber networks and that is its ability to reconfigure its connection topology by beam steering in time scale of at least mS if not µS. This paper describes a cognitive technique for the fast estimation of traffic changes and...
Leveraging on reference implementations of PCEP and BGP-LS protocols, we have developed an active stateful multilayer PCE extension for the open-source Net2Plan planning tool to orchestrate multilayer service provisioning and restoration in IP/MPLS-over-WDM networks.
This paper proposes a new model that can represent the slot usage and the status of each possible slot groups in a flexible-grid optical network. This model facilitates visualizing the current network state in a graphical form as well as a proper data structure in the memory. It also promotes the design of new approaches for dynamic connection provisioning. The basic concepts of the model is illustrated...
Some characteristics of optical networks can be assessed by analyzing the topology of the network. Many metrics can be used for this purpose. Modularity indicators were already proposed to study complex networks, and they have been useful to clarify many real world problems. In this paper, we propose an indicator inspired in the traditional modularity concept aiming at finding suitable routes in optical...
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...
The distributed control in elastic optical networks proposed in our previous work can reduce call blocking probability and connection establishment time by booking a reservation path and a tentative (second candidate) reservation path at a time. However, there is a possibility of failure in establishing both the reservation path and the tentative reservation path because reservation paths are decided...
Flexible-grid optical networks are the most convincing candidate for the evolution of backbone optical networks thanks to their high spectral efficiency and flexibility. We propose an original approach to the logical topology design (LTD) problem in the offline planning phase. We deal with the LTD problem using heuristic algorithms incorporating a detailed transmission layer model. Several heuristic...
To satisfy the Square Kilometre Array's (SKA) frequency dissemination requirement, Tsinghua University designed a “1f-2f” frequency dissemination system. Compared to the former frequency dissemination system, it has better expandability which can support the star topology frequency dissemination network. In order to get the specifications as well as to find the potential problems of the frequency...
The so-called 5G networks promise to be the foundations for the deployment of advanced services, conceived around the joint allocation and use of heterogeneous resources, including network, computing and storage. Resources are placed on remote locations constrained by the different service requirements, resulting in cloud infrastructures (as pool of resources) that need to be interconnected. The automation...
Current metro networks are deployed using IP/MPLS equipment on top of ring physical topologies. Such networks are migrating from 10G interfaces to 100G. Such evolution must consider not only the packet layer, but also the underlying infrastructure with its limitations. This paper assesses alternative deployments to upgrade metro networks in terms of cost efficiency. For scenarios with low traffic...
In wavelength-division multiplexing (WDM) networks, wavelength reservation protocols are employed to establish end-to-end lightpaths between source-destination node pairs. In this paper, we propose a new reservation scheme that is targeted for application in large-scale WDM core optical networks requiring wavelength-continuity, such as the CORONET Continental US (CONUS), initiated by DARPA. The proposed...
Hierarchical metro and core network designs, which dominate today's networks, become increasingly cost-inefficient as traffic grows. In this paper we show that flat architectures are lower cost and we propose a migration strategy that ensures cost-efficiency throughout the migration process.
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