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Modern IP/Optical transport networks are seldom jointly operated and optimized, and do not cater to the usually implicit requirements of applications, which ultimately drive network traffic. In this concept paper we propose a Software Defined Networking (SDN) based Network Orchestrator to manage multi-layer transport networks while taking explicit application requirements into account. We discuss...
We present a novel strategy for the operation of a mixed fixed/flexible grid optical network which would be useful for the gradual migration from a fixed to a flexible mode of operation. Routing and spectrum allocation (RSA) in co-existing fixed/flexible grid optical networks with a multi-path sub-band virtual concatenation (VCAT) technique is considered. An integer linear programming (ILP) model...
The recently developed Software-Defined Networking (SDN) provides flexibility, scalability and reduce the cost of hardware for operators and vendors. In this paper, we propose four routing algorithms in SDN to minimize network latency and balance the traffic load of each switch link in a network. The first routing algorithm is the shortest path first (SPF) algorithm. The SPF algorithm can find the...
The Tor network has its user grown by thousands every year. The increasing number of users around the world makes Tor become one of the widely used privacy networks today. However, as the number of Tor user increases, the performance of Tor degrades badly due to traffic is not fairly distributed. As a result, the Tor network does not provide a better quality of communication for all its users. To...
We design a bandwidth regulation module, by adapting and extending the algorithm of MemGuard Linux kernel module for hardware implementation. Our extensions differentiate among NoC sources with rate-constrained and best-effort traffic provisions, support a violation free-guaranteed operating mode for rate-constrained flows, and support dynamic adaptivity through EWMA prediction. Our strategies enhance...
Recently, Cloud based Content Delivery Network (CCDN) has emerged as efficient content delivery architecture to provide content delivery services with improved Quality of Service (QoS), scalability and resource efficiency. Replica server placement is a key design issue in CCDNs and involves deciding the placement of replica servers on geographically dispersed cloud sites that minimizes the operational...
In this paper, we propose a new routing algorithm which calculates bandwidth-delay constrained routes in the fast and efficient manner. The algorithm is designed for the software-defined backbone networks, where the control plane is separated from the data plane and logically centralized. Besides providing the required quality of service (QoS), the algorithm aims to maximize utilization of network...
Software Defined Network (SDN) provides a new fine-grained interface enables the routing algorithm to have an a global view of the network throughputs, connectivity and flows at the data-path. This paper aims to provide a novel approach for dynamic routing algorithm for Software Defined Network in Wide Area Network (SDN-WAN); based on using a modified shortest-widest path algorithm with a fine-grained...
Nowadays, real time data transmission, i.e., high priority (HP), over internet is very popular. That is why, Ethernet passive optical networks (EPONs), with the properties of low cost, high speed and high efficiency with quality of service (QoS) have become promising candidates for the next generation broadband access network. To avoid data collision and provide effective bandwidth utilization a medium...
Computational offloading is an effective method to address the limited battery power of a mobile device, by executing some components of a mobile application in the cloud. In this paper, a novel offloading algorithm called ‘Dynamic Programming with Hamming Distance Termination’ (denoted DPH) is presented. Our algorithm uses randomization and a hamming distance termination criterion to find a nearly...
Software Defined Networking enables centralized network control and hence paves the way for new services that use network resources more efficiently. Bandwidth Calendaring (BWC) is a typical such example that exploits the knowledge of future to optimally pack the arising demands over the network. In this paper, we consider a generic BWC instance, where a carrier network operator has to accommodate...
Multicast becomes essential in data center networks, since more and more applications require group communication. The existing multicast scheduling algorithms in data center are Internet-based or centralized, which are either not efficient or not scalable. In this paper, we propose a Distributed and Dynamic Multicast (DDM) solution for fat-tree data center networks. It includes multicast initialization,...
When a massive network disruption occurs, repair of the damaged network takes time, and the recovery process involves multiple stages. We previously proposed a multi-stage network recovery method for determining the pareto-optimal recovery order of failed physical components, reflecting the balance requirement between maximizing the total amount of traffic on all logical paths, called total network...
Mobile Ad-hoc Networks (MANETs) can be setup uniquely for a particular purpose. MANETS are mobile, free to move in any direction. They use wireless connection such as Wi-Fi or any other standard medium for connecting to other networks. Applications of MANETs are improving day by day, somaintaining the bandwidth efficiency is very important. This can be done by minimizing the energy consumption, distributing...
Network Function Virtualization (NFV) is an emerging technology proposed to improve service provisioning in telecommunication industry. The flexibility of NFV enables network operator to dynamically deploy Virtual Network Functions (VNFs) according to real-time requirements. However, a large amount of VNFs with low utilization may be deployed in network due to dynamic arrival and departure of services...
Online compression of I/O-data streams in general purpose computing will enhance the effective I/O bandwidth of processors, the bandwidth of the computer network as well as the storage capacity and the read/write performance of the storage. In this paper, a self-adaptive dynamic partial reconfigurable architecture for the online compression of data streams is introduced. The proposed architecture...
Generally, an elastic optical network (EON) under a dynamic connection (non-uniform bandwidth) set up and termination scenario leads to spectrum fragmentation, and results in higher blocking probability. To overcome this problem, a defragmentation of the spectrum can be applied by reconfiguring some or all connections in the network. However, reconfiguration can interrupt the services of the existing...
In this paper, we model and analyze the resource management problem of energy harvesting-based underlaying device-to-device (D2D) communication in uplink cellular networks (CNs). D2D transmitter can harvest energy from ambient inter- ference and reuse the spectrum of the cellular users (CUs) to com- municate with corresponding receiver. The energy of transmitters comes form the mix of the harvested...
In recent years, virtualization is playing an increasingly important role in the cloud environment, as it allows service providers to create an abstraction of the physical servers running on data centers. In this way services can be directly hosted on these abstract entities, which are then called Virtual Machines (VMs). The direct result of service virtualization is the ability to move services hosted...
Fiber-Wireless (FiWi) access network, which could provide an anytime-anywhere access for end users with high bandwidth capacity and long distance, is facing the challenge of resource allocation and optimization due to the complexity and diversity of traffic demands. Though network virtualization becomes a promising solution, which allows heterogeneous virtual networks coexisting on the shared substrate...
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