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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 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.
As virtualization is becoming a promising way to support various emerging application, efficient virtual network embedding (VNE) algorithm is becoming more and more important. In this paper, we investigate the VNE problem from a new perspective. We propose two concepts of strongly connected graph and weakly connected graph in undirected graph witch are similar to the concepts in directed graph. With...
Data Center is a multifunctional infrastructure that consists of thousands of compute servers and network devices. The fat-tree topology is widely adopted because of its efficiency and safety. However, the fat-tree topology can not completely meet the time-varying communication needs from physical and virtual machines. 60 GHz wireless technology was then incorporated into data centers for its high...
Network virtualization has been proposed to be a promising way to solve the Internet ossification problem. One of the main challenges for network virtualization is the virtual network embedding (VNE) problem, which focuses on the efficiency of the substrate resources allocation and involves the virtual node and link mapping problems. Node mapping process has serious influence on the whole mapping...
Silicon photonics is an emerging technology that delivers higher ratios of bandwidth to power than today's electrical interconnects. This paper explores whether graph-based analytics, increasingly important for high performance computing, can benefit from photonics' energy-efficient bandwidth. We select two contrasting photonically-enhanced systems projected for 2020. We sketch optical and electrical...
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...
Cognitive radio network (CRN) is proposed to solve the problem of the scarce radio spectrum resources. In CRN, primary users (PUs) are allowed to lease out their unused spectrum sharing with cognitive users (CUs). In this paper, we propose a parallel spectrum allocation algorithm based on CUs bandwidth requirement, and the spectrum allocation time is also taken into account. Our objective is to optimize...
In data storage systems, data are typically stored in redundant storage nodes to ensure storage reliability. When storage nodes fail, with the help of the redundant nodes, the lost data can be restored in new storage nodes. Such a regeneration process may be aborted, since storage nodes may fail during the process. Therefore, reducing the time of regeneration process is a well-known challenge to improve...
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...
We present FDALB, a flow distribution aware load balancing mechanism aimed at reducing flow collisions and achieving high scalability. FDALB, like the most of centralized methods, uses a centralized controller to get the view of networks and congestion information. However, FDALB classifies flows into short flows and long flows. The paths of short flows and long flows are controlled by distributed...
The Secure Autonomous Response Networks (SARNET) framework introduces a mechanism to respond autonomously to security attacks in Software Defined Networks (SDN). Still the range of responses possible and their effectiveness need to be properly evaluated such that the decision making process and the self-learning capability of such systems are optimized. To this purpose we developed a touch-table driven...
A novel class-AB Flipped Voltage Follower is proposed, suitable for low-voltage low-power CMOS implementation in advanced technology nodes. Simulations have been performed using STMicroelectronics models for the 45nm technology. The Flipped Voltage Follower allows low output impedance and high linearity by means of a feedback loop. However, like the conventional common-drain voltage follower, it has...
Currently, Quantized Congestion Notification (QCN) has been accepted as the standard layer 2 congestion control protocol in Data Center Ethernet. Although the good performance of QCN has been validated in many experiments, we find that QCN has two drawbacks. First, the incomplete binary search in QCN fails to find the proper sending rate, leading to complicate supplement mechanisms. Second, in face...
Today, data traffic grows in a more dynamic way than voice traffic and it requires high data rates to support advanced services and applications. Mobile operators must deal with this amount of traffic and must meet user requirements. They must provide more throughput on the transmission path. One of the ways this can be done is to use LTE-Advanced with the carrier aggregation technique. This is one...
This paper presents the experimental evaluation of an SDN-based orchestration system enabling the automated and coordinated arrangement of both computing and network resources in cloud Data Centers. The testbed has been set-up in the Fed4FIRE virtual experimental environment that allows for extensive, large-scale and cross-functional tests to be carried out. Results show that the selection of servers...
Geometric models are a proven aid for calculating the CapEx needed for a network deployment and used widely by telecommunication network operators for their access networks. However, for the economic viability an accurate estimation of the delivered bandwidth is important as well. In this paper a method is described to calculate a bandwidth profile for an area under investigation, given a single topology...
Aware of the benefits that Software-Defined Networking (SDN) can entail for traffic engineered services, the pan-European National Research and Education Network (NREN) Géant has started to work on an SDN-based solution to provide Bandwidth on Demand (BoD) services. The proposed solution relies on a framework called DynPaC, which is able to provide resilient L2 services taking into account bandwidth...
This paper demonstrates the physical and logical topological slicing in computer networks through Software Defined Networks (SDN) with the added benefit of data privacy. To deal with the complex requirements of the modern networks, a sudden re-configuration of a network is often required. Modern applications require the configuration of networks on a fly and according to dynamically changing requirements,...
Network visualization enables coexistence of multiple virtual networks on a shared infrastructure without requiring unified protocols, applications, and control and management planes. Recent approaches such as Software Defined Networking have enabled cloud service providers to offer virtualized network services that require embedding virtual network requests in data centers. In this paper, we employ...
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