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Massive multi-input multi-output (MIMO) can provide high throughput improvements by using a large number of antennas to serve a small number of terminals simultaneously. Due to channel hardening of massive MIMO, this paper directly investigates the approximate network throughput with zero-forcing beamforming (ZFBF) and conjugate beamforming (CBF) schemes when channel state information (CSI) acquisition...
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...
Early estimation of the peak power consumption of a system under development is crucial in assessing the design's reliability and thermal profile, and for benchmarking various architectural options and chip-level power management features. In this paper, we present a versatile power-virus generation technique for Networks-on-Chip (NoC), which allows the designer to quantify the realistically attainable...
Adaptive modulation and coding (AMC), power control (PC) and automatic repeat request protocols (ARQ) represent very important link adaptation (LA) techniques for future generations of wireless communication systems. In order to improve the efficiency of these systems, some combination schemes of these LA techniques have been proposed in the literature. Most of these schemes were interested in the...
The Generalized Nets apparatus is applied here to describe the MiMa-algorithm for computing a conflict-free schedule for packet switch. In the paper we propose a family of patterns for nonuniform traffic simulation. The results for throughput on a switch node with MiMa-algorithm by computer simulations with these patterns are presented. The necessary computations have been executed on BG01-IPP grid-cluster...
File system metadata is indispensable in both describing the data and maintaining the file system. Despite the importance of metadata in the file system, the overhead of maintaining the metadata cannot be taken lightly. It is because the metadata also have to be persisted on the storage device and it consumes IO bandwidth as well as creates journaling overhead. In this paper, we find that the random...
Cognitive radio (CR) lifts efficiency of information resource. As one way of utilizing the renewable energy resources, energy harvesting makes use of energy from the environment. Due to intermitted feature of the renewable energy, the power grid needs to be integrated to regulate the harvested energy supply of the system. Thus, the transmit power of the second user (SU), including the power from both...
In literature, dynamic planning (base station (BS) on-off switching) is proposed as an efficient approach for energy saving at a low call traffic load condition. All related research efforts aim to employ dynamic planning to save energy for the network operators while satisfying the quality-of-service (QoS) for downlink mobile users. On the other hand, although switching off a BS can save energy for...
In this paper, we propose solutions to the transmission mode selection and resource allocation problems for D2D unicast communications. We first formulate a joint mode selection and resource allocation problem, which we further decompose into separate mode selection and resource allocation problems, which are run at different timescales. Our mode selection algorithm determines the optimal transmission...
Network faults like link or switch failures can cause heavy congestion and packet loss. Traffic engineering systems need a lot of time to detect and react to such faults, which results in significant recovery times. Recent work either pre-installs a lot of backup paths in the switches to ensure fast reroute, or proactively pre-reserve bandwidth to achieve fault-resiliency. Our idea agilely reacts...
Due to the demand of emerging Cognitive Radio (CR) technology to permits using the unused licensed spectrum parts by cognitive users (CUs) to provide opportunistic and efficient utilisation of the white spaces. This requires deploying a CR MAC with the required characteristics to coordinate the spectrum access among CUs. Therefore, this paper presents the design and implementation of a novel Medium...
Network performance evaluation tools play important roles in network researches. However, most tools will cause highly CPU utilization and high monetary cost. Moreover, it is not easy to set up a test environment anytime and anywhere. To solve this problem, we build a lightweight network performance evaluation tool, SDNort, through the OpenFlow architecture. Through our evaluation tool, users can...
In this paper, we have exploited the novel hybrid-cum-improved spectrum access strategy to significant improvement in the throughput and data-loss rate. This proposed strategy is comprise of hybrid spectrum access and improved frame structure strategies for the cognitive radio communication system. In addition to this, the mathematical expressions of throughput for these approaches are also presented...
Network-on-Chip(NoC) has been well accepted for energy efficient on-chip communications for many-core systems. As the technology scaling drives the number of cores upward designers of the on-chip interconnect for many-cores chips are facing with the dilemma of meeting performance and energy requirements with power and thermal constraints. This paper focuses on the Network-On-Chip energy and performance...
A normal way to specify network stack performance for a platform is by indicating the CPU utilization, and the code size (program memory usage) of the stack. This does not take into account performance characterization using different Ethernet packet payload sizes and then measuring the performance against the aggregated bandwidth across the network. This paper presents a realistic method of associating...
Available radio resources in a wireless communication network are normally shared among multiple users. The state during which the number of users admitted into a network exceeds the capacity of the network is known as network congestion. Network congestion causes degradation of Quality of Service (QoS) and Grade of Service (GoS), which results in users' dissatisfaction. Thus, it is of uttermost importance...
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...
An Artificial Neural Network has been proposed as predicting the performance of the Software Defined Network according to effective traffic parameters. Those used in this study are round-trip time, throughput and the flow table rules for each switch, POX controller and OpenFlow switches, which characterize the behaviour of the Software Defined Network, have been modelled and simulated via Mininet...
Traffic safety applications exploit vehicle-to-vehicle communication is an emerging and promising area within the intelligent transportation system (ITS) environment. This objective would be achieved essentially by the employ of efficient safety applications which should be able to wirelessly broadcast warning messages between neighboring vehicles in order to inform drivers about a dangerous situation;...
This paper proposes KAR (Key-for-Any-Route), a new intra-domain resilient routing system in which edge-nodes set a route ID to select any existing route as an alternative to safely forward packets to their destination. In KAR routing system, a route is defined as the remainder of the division between a route ID and a set of switch IDs along the path(s) between a pair of nodes. KAR-enabled switches...
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