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Fragmentation in Elastic Optical Networks is an issue caused by isolated, non-aligned, and non-contiguous frequency slots that can not be used to allocate new connection request to the network, due to the optical layer restrictions imposed to the Routing and Spectrum Assignment (RSA) algorithms. To deal with this issue, several studies about Spectrum Defragmentation have been presented. In this work,...
Extreme-scale science applications are highly innovative and constantly evolving. They are expected to generate data in the petabyte and exabyte ranges. This data needs to be transferred, processed, and analyzed at remote locations. A flexible data retrieval service is needed, where a user requesting data retrieval from a remote site can have a choice between replicated storage sites. Elastic Optical...
In providing new telecommunication services, the requisition for quality of network is more and more popular and sophisticated with high bandwidth, small value of delay time or packet loss etc. To assure the quality of network, the localized routing schemes have recently been researched as a promising alternative to the currently deployed global QoS routing schemes. Different from the traditional...
For intermittently connected mobile networks, many hybrid routing protocols combined conventional mobile ad hoc networking (MANET) routing with Delay Tolerant Networking (DTN) approach, have been proposed. These protocols transfer data quickly in networks. They transfer data by a store-carry-and-forward paradigm when network is interrupted. However, these routings do not consider the Quality of Service...
This paper presents a fuzzy logic stable-backbone-based multipath routing protocol (FLSBMRP) for MANET that provides a high-quality path for communication between nodes. The proposed protocol has two main phases. The first phase is the selection of candidate nodes using a fuzzy logic technique. The second phase is the construction of a routing backbone that establishes multiple paths between nodes...
Localized Quality of Service (QoS) routing has recently been proposed as a promising alternative to the currently deployed global routing algorithms. In localized routing schemes, routing decisions are taken solely based on locally collected statistical information rather than global state information [1]. This approach significantly reduces the overheads associated with maintaining global state information...
Bandwidth defragmentation, i.e., the operation to reconfigure existing connections for making the spectrum usage less fragmented and less misaligned, has recently been recognized as one of the most important features for elastic optical networks (EONs). In this paper, we propose a novel comprehensive bandwidth defragmentation algorithm that considers the problems of 1) When to defragment? 2) What...
In this paper, we study several important issues that can be used to prevent pirated content propagation in BitTorrent (BT) Distributed Hash-Tables (DHT) networks. We design a system called PPBD to stop pirated content propagation by utilizing several attacking methods. First, the system can efficiently deal with massive concurrent connections to reduce bandwidth consumption, schedule peers to cooperate...
OFDM-based flexible optical networks provide better spectral efficiency than conventional WDM optical networks as connections can be allocated requested capacity instead of full wavelength capacity. Survivability is an important issue in OFDM-based flexible optical networks. However, little work has been done in this area. In this study, we propose a survivable multipath provisioning scheme that provides...
Many high-performance networks support both advance and immediate bandwidth reservations, the former reserving bandwidth ahead of time in a future time slot to provide guaranteed bandwidth, while the latter allocating bandwidth upon availability in the next immediate time slot. As a result, an ongoing data transfer task based on an immediate reservation may be preempted by the activation of an advance...
Co-operative peer-to-peer systems have lot of relevance due to their desirable properties like lack of centralized control and transparency. But in certain applications, the stability of peer-to-peer systems is affected when concentrated load spikes occur. In this work, we explore the case for cloud-assisted peer-to-peer systems to handle spikes using peer-to-peer search as a case study. We identify...
When dealing with multimedia delivery, scalability, efficiency and Quality of Service (QoS) are challenging features for today's networks. Overlay networks can compensate for the lack of control over the network routers, but for real-world applications overlay network performance is an issue. This paper presents an efficient solution for software implementation of overlay network nodes. A new, advanced...
As a failure occurs, the affected traffic is quickly switched to backup paths for a network performing a fast IP rerouting. However, the rerouted traffic may cause congestion along the backup paths that would result in more packet losses than purely discarded the affected flows. In this paper, we take the concept of interface specific forwarding (ISF) to provide more flexibility in determining load...
We propose a random-walk-based file search for unstructured P2P networks. In the proposal, each node keeps two pieces of information, one is on the hop-limited shortest path tree rooted at itself and the other is on the indexes of files owned by neighbor nodes, referred to as the file list. A random-walk search is conducted along the concatenation of hop limited shortest path trees. To find a file,...
Overlay networks are becoming prevalent in today's networking environment. We consider scenarios where substrate resources are primarily consumed by many overlay networks placed on top of the substrate. We focus on the fair and efficient allocation of substrate link bandwidth among competing overlays. We adapt various existing fairness definitions to this scenario and define a metric to evaluate the...
The distributed wireless communications system is a new architecture for wireless access with multiple distributed relay stations (RSs). Instead of the traditional cellular system, the multihop cellular network for executing their data transmission can potentially augment coverage, data rates, and quality of service (QoS) performance. However, in the multiuser environment the multihop cellular system...
In this paper, we study the fundamental property of the ad hoc network using connectivity index. We investigate the construction of minimum cost multicast trees by selecting a link having minimum connectivity Index and comparing application required bandwidth with (available bandwidth - allocated bandwidth) of the link. We have shown that Increase in total connectivity Index of the entire network...
Traffic grooming in wavelength division multiplexing networks merges low-speed flows into large capacity pipes so that the bandwidth discrepancy between them will not lead to underutilization of resources. Dynamic grooming deals with requests for wavelength allocation based on a dynamic pattern of arrivals in contrast to the situation of static grooming in which the pattern of arrivals must be previously...
This paper proposes a novel network architecture called cloud control plane (Cloud C-plane) to reduce the power consumption of networks. In Cloud C-plane, the forwarding functions and control functions are decoupled, and the control functions are placed in the cloud. In addition, physical network topology is modified to improve the energy efficiency when the load of traffic changes. The routing engine...
Point-to-point metrics, such as latency and bandwidth, are often used to characterize network performance with the consequent assumption that optimizing for these metrics is sufficient to improve parallel application performance. However, these metrics can only provide limited insight into application behavior because they do not fully account for effects, such as network congestion, that significantly...
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