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Network on a chip(NOC) is a new kind of communication method on a chip, which is evolved from system on a chip(SOC), learning from computer network. It is an important component of the multi-core technology. The network on a chip provides a new way to communicate, and it performs better than the original system on a chip based on bus. As the size of system on a chip expanded, the number of nodes in...
Priority encoders and arbiters usually drive multiplexers (muxes). Latency optimization of priority encoders and multiplexer trees has usually been handled separately in the literature. However, in some applications with circular data dependencies, the combined latency of the arbiter and muxing needs to be optimized. Moreover, there is an ever growing need for throughput. This requires switches that...
In this paper a novel algorithm is proposed for the purpose of load balancing for SDN-based datacenters. Mininet emulator was utilized for the purpose of emulating the proposed system, the suggested algorithm was added to the POX controller. To evaluate our algorithm, we simulated a datacenter with a Fat-Tree topology (k=4). The algorithm was proposed to dynamically balance the load by means of re-routing...
A simple scheme to implement dedicated path protection in Elastic Optical Networks is proposed and evaluated under dynamic traffic conditions. It consists in splitting the spectrum available in the network links in two bands used respectively for working and backup traffic. These bands are conveniently sized taking into account the network topology and the routing constraints. When the band dedicated...
The DC-DC Modular Multilevel Converter (MMC), which has originated from the AC-DC MMC circuit topology, is an attractive converter topology for interconnection of medium/high-voltage DC grids. Proper operation of the DC-DC MMC necessitates injection of an AC circulating current to maintain its submodule (SM) capacitor voltages balanced. The AC circulating current, however, needs to be minimized for...
This paper addresses an energy efficient network topology management strategy which exploits the path diversity in a dual-hop backhaul network in order to lessen the power consumption by switching as many underutilized base stations as possible to a dormant mode. This scheme dynamically tunes the various states of the relay nodes and aggregation points in a dual-hop setup to meet a trade-off between...
Software-defined networking (SDN) is moving from its initial deployment in small-scale data center networks to large-scale carrier-grade networks. In such environments, high availability and scalability are two of the most prominent issues and thus extensive work is ongoing. In this paper, a well-known open source project, OpenDaylight (ODL) is analyzed in terms of network state database partition/synchronization...
Since traffic diversity and volume increase with growing popularity of mobile applications, there is the strong need to manage the traffic carried by networks. Software defined networks can simplify network management while enabling new services by employing traffic management including routing whose goal is to maximize the given utility while satisfying capacity requirements. In this paper, we propose...
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...
In recent days, more complicated interconnection topologies have been replaced with previously simple topologies that also exhibit high performance. x-Folded TM network is a TM network that is folded according to the imaginary x-axis in interconnection networks. For a x-Folded TM network, there is a reduction in the average distance and diameter which corroborates the efficient performance. Also many...
The advancements in emerging interconnects for Networks-on-Chip (NoCs) brings with it promising solutions to integrate single-hop long-range high-bandwidth on-chip links to achieve enhanced network performance. The use of these lie in the design of modern heterogeneous systems with increasing number of processing blocks, which may include application specific unconventional topologies. In this work,...
The Wireless sensor network (WSN) deployment areas in real time environment are often inaccessible and unreliable communication resulting in degradation of network performance. The critical issues in any WSN are QoS and energy. Post deployment, it may not always be feasible to replace the batteries in a WSN. Long hops of transmission maintaining the QoS with more energy consumption results in reduction...
Deployment of portable access points (APs) in disaster affected areas has been heralded by many contemporary researchers as a key technique to formulate disaster recovery networks. However, existing research works do not effectively address one of its key problems, i.e., the low capacity of the backbone network (constructed by the APs) which is unable to satisfy the high user demands emanating from...
Telecommunication networks are generally dimensioned to provide services with small delays and high throughput during peak-periods. Due to the sizable difference in the network utilization between the peak and off-peak periods as well as the requirements of robust performance in face of both traffic burstiness and various types of network failures, these networks are significantly over-dimensioned...
This work explores the idea of building multi-Gigabit indoor enterprise WLANs using the millimeter-wave technology. Instead of the legacy 2.4/5 GHz band, we look at the unlicensed band around 60 GHz and the new 802.11ad standard, which supports PHY data rates of up to 6.76 Gbps. Through a set of measurements with commercial hardware, we show the feasibility of building multi-Gigabit WLANs. Using observations...
Packet forwarding anomaly is an abnormal network state where flows are forwarded along wrong paths. Current practice of forwarding anomaly detection in Software Defined Networks (SDN) is achieved by sending probing packets or analyzing flow statistics. However, these approaches are not effective and efficient. For example, the probing approaches cannot capture all attacks, and the statistics approaches...
This paper is a broad introduction to the resource allocation problems in cloud systems including Inter-Clouds and Mobile Clouds as well as proposed solutions to these problems. Allocation of computing and network resources to cloud tasks requires innovative approaches in each case of cloud data centers, Inter-Clouds and geographically distributed clouds in order to optimize various performance criteria,...
High smartphone penetration and Average Revenue Per User (ARPU) growth imply a quick and good broadband services delivery. In this context, Mobile Networks Operators (MNOs) have to satisfy current subscribers and gain new ones. Small Cells (SCs) are a promising alternative to MNOs to reach emerging markets and meet the rising mobile broadband demand. However, most of those competitive markets have...
TCP suffers from incast collapse in data center networks when used with partition aggregate workloads due to inadequate congestion control parameters. This causes poor application performance by under-utilizing the network, and can be one of the limiting factors in low-latency, high-throughput environments. To resolve this, we present Omniscient TCP (OTCP), a Software Defined Networking (SDN) approach...
Nowadays, monitoring per-flow metrics, such as throughput and delay, in OpenFlow networks represents an important input to implement traffic engineering approaches. Per-flow monitoring mechanisms require to uniquely identify the complete network path followed by all the packets of the corresponding flow. For example, in order to measure path delay, monitoring mechanisms regularly inject probe packets...
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