Both academic researchers and network vendors have started to promote Software-Defined Networking (SDN) as a new network paradigm, in which controller systems play a major role. A modular and extensible design allows network operators to extend the controller’s functionality by so called network services. Unfortunately, in current designs such network services have unlimited access to…
Category: MS IN OMNET++
A programmable and virtualized network & IT infrastructure for the internet of things: How can NFV & SDN help for facing the upcoming challenges
The Internet of Things (IoT) revolution has major impacts on the network & Information Technology (IT) infrastructure. As IT in the past decade, network virtualization is simultaneously on its way with for instance Network Functions Virtualization (NFV) and Software-Defined Networking (SDN). NFV and SDN are approaches enhancing the infrastructure agility thus facilitating the design, delivery…
OpenFlow-assisted online defragmentation in single-/multi-domain software-defined elastic optical networks [invited]
Spectrum fragmentation limits the efficiency of spectrum utilization in elastic optical networks (EONs). This paper studies how to take advantage of the centralized network control and management provided by software-defined EONs (SD-EONs) for realizing OpenFlow-assisted implementation of online defragmentation (DF). We first discuss the overall system design and OpenFlow protocol extensions to support efficient online…
SDN orchestration of OpenFlow and GMPLS flexi-grid networks with a stateful hierarchical PCE [invited]
New and emerging use cases, such as the interconnection of geographically remote data centers, are drawing attention to the need for provisioning end-to-end connectivity services spanning multiple and heterogeneous network domains. This heterogeneity is due not only to the data transmission and switching technology (the so-called data plane) but also to the deployed control plane,…
Dynamic OpenFlow-Based Lightpath Restoration in Elastic Optical Networks on the GENI Testbed
Elastic optical networking (EON), with its flexible use of the optical spectrum, is a promising solution for future metro/core optical networking. For the deployment of EON in a real-operational scenario, the dynamic lightpath restoration, driven by an intelligent control plane, is a necessary network function. Dynamic restoration can restore network services automatically and, thus, greatly…
GFlow: Towards GPU-based high-performance table matching in OpenFlow switches
This paper investigates the acceleration of Software-based OpenFlow switches, equipped with commodity off-the-shelf hardware, for high-performance table matching. Particularly, due to the high flexibility and compatibility, software-based and SDN-compatible switches, such as OpenvSwitch, has been widely applied in several viable fields, like cloud services, future Internet architectures, and the network function virtualization (NFV). In these…
Interference Suppression using Generalized Inverse Precoder for Downlink Heterogeneous Networks
This letter proposes an optimal precoder design using a generalized inverse structure for downlink crosstier interference suppression between macro base station (MBS) and femtocell access point (FAP) transmission in heterogeneous networks. Using Tikhonov regularization, we derive a closed form relationship between given MBS transmit power or interference constraints and the regularization parameter. Determining a Pareto…
Distributed Secret Dissemination Across a Network
Shamir’s (n; k) threshold secret sharing is an important component of several cryptographic protocols, such as those for secure multiparty-computation and key management. These protocols typically assume the presence of direct communication links from the dealer to all participants, in which case the dealer can directly pass the shares of the secret to each participant.…
Lag Synchronization of Switched Neural Networks via Neural Activation Function and Applications in Image Encryption
This paper investigates the problem of global exponential lag synchronization of a class of switched neural networks with time-varying delays via neural activation function and applications in image encryption. The controller is dependent on the output of the system in the case of packed circuits, since it is hard to measure the inner state of…
Copper is the new black for ultra broadband networks
G.fast, the newest ITU protocol for copper access, will deliver anywhere from hundreds of Mb/s to close to 1Gb/s. Operators have an additional tool at their disposal to provide fiber like speeds over existing copper.