Simulation Tool For Performance Evaluation Research Articles

5G-RCOLAB: A system level simulator for 5G and beyond in rural areas

This paper describes 5G-RCOLAB, an open source simulation tool for performance evaluation of 5G/6G wireless networks in rural areas. The tool is designed with a layered architecture, based on three modules: (i) a link-level simulator of a communication channel for remote areas, with a mapping Link to System (L2S) interface; (ii) a Long-Term Evolution (LTE)-based physical layer adapted for remote areas, together with a Medium Access Control (MAC) layer that includes a novel Collaborative Spectrum Sensing (CSS) technique with security features for Byzantine attacks and spectrum usage efficiency; and (iii) an application oriented network layer that emulates the behavior of typical users in rural areas. The tool has the goal to reduce simulation complexity of large scale 5G rural networks and at the same time, to represent coherently the features of the physical and MAC layers, that include new channel models that cover long distances with the use of TV White Spaces (TVWS) in the Ultra High Frequency (UHF) and Very High Frequency (VHF) bands, as well as novel CSS techniques to improve spectrum efficiency. The 5G-RCOLAB was validated both by field test measurements from a Proof of Concept (PoC) prototype and by the simulation and evaluation of three 5G common core use cases in rural areas. The results show that the 5G-RCOLAB features allow a better evaluation of novel technologies implemented in the physical and MAC layers and provide paths for improvements and deployments of cost effective solutions of 5G in rural or remote areas.

Analysis of metal hydride storage on the basis of thermophysical properties and its application in microgrid

Present study focuses on the analysis of metal hydride hydrogen storage in renewable power generators-based microgrid (µG) system. The design of metal hydride storage unit requires parametric analysis on the basis of its thermophysical properties such as activation/deactivation energy, enthalpy of formation, equilibrium pressure, reaction kinetics and external thermal management system. This parametric analysis helps to assess suitability of the hydride storage with hydrogen generation (electrolyzer) and utilization (fuel cell) units in µG. Application of metal hydride in the µG creates a sophisticated system which requires careful analysis and operating strategy for achieving manifold benefits such as higher efficiency, durability of the components and self-sufficiency. In the present study, different hydrides are selected namely, LaNi5, TiCr1.6Mn0.2, hydroalloy C5 graphite and MgH2 for performance analysis on the basis of their thermophysical properties. The performance is evaluated in different operating modes aiming for higher efficiency, components durability and system self-sufficiency (minimum grid-dependency). A detailed mathematical modelling is performed in the MATLAB simulation tool for performance evaluation of overall µG system, which consists of 5 kW photovoltaic (PV), 1 kW fuel cell (FC), 5 L hydride storage and 0.6 kW electrolyzer. It was observed that the hydrogen charging and discharging processes in the hydride storage unit strongly depend on its thermophysical properties and hence require certain specific operating conditions for efficient working. Considering suitable discharging characteristics at low temperature and pressure, LaNi5and C5 hydroalloy can be suitable for transient operation with proton exchange membrane fuel cell application. Overall energy efficiency of up to ≈ 95.49% is achieved in such type of storage-based µG. Grid-dependency ratio (load demand met by grid power/total load demand) was found between 0.26 and 5.83% in different operating modes.

NS2 Based Simulation Tool for Performance Evaluation of TCP Traffic in Different Networks

Execution appraisal of TCP website traffic in OBS frameworks has been underneath heightened examine, due to the fact TCP builds up the majority of net visitors. As a dependable and transparently open take a look at framework, ns2 has been generally used for considering TCP/IP frameworks; anyways ns2 dreams an extensive parcel of the elements for imitating optical burst buying and selling frameworks. in this paper, a ns2 primarily based OBS reenactment gadget (nOBS), that is labored for reading burst assembling, reserving and strife targets counts in OBS frameworks is proven. The middle factor and association inquiries in OBS are connected in nOBS for making optical facilities and optical institutions. The passage, attention and flight middle factor functionalities are joined into a run of the mill optical center factor constructing, which incorporates masters chargeable for burstification, controlling and arranging. The results of burstification parameters, e.G., burstification break, burst size and number of burstification backings enhance center thing, on TCP execution are investigated the usage of nOBS for one among a type TCP interpretations and unmistakable framework topologies. The path of motion of libraries we long-established for this object is called Multi InteRfAce move Layer Extension for ns2 (MIRACLE). They replace the functionalities supplied with the aid of the network Simulator ns2 by using way of giving a beneficial and embedded engine for coping with skip-layer messages and, on the equal time, enabling the combination of various modules inside every layer of the display stack. as an instance, various framework, association, MAC or physical layers may be resolved and used inside a comparative center. the consequences of this are puzzling. As an trouble of first importance, the structure empowers the execution and the reenactment of present day-day correspondence structures in ns2. moreover, due to its planned great, the code is probably reduced, re-usable and extensible.

NOBS: an ns2 based simulation tool for performance evaluation of TCP traffic in OBS networks

Performance evaluation of tcp traffic in obs networks has been under intensive study, since tcp constitutes the majority of Internet traffic. As a reliable and publicly available simulator, ns2 has been widely used for studying tcp/ip networks; however ns2 lacks many of the components for simulating optical burst switching networks. In this paper, an ns2 based obs simulation tool (nobs), which is built for studying burst assembly, scheduling and contention resolution algorithms in obs networks is presented. The node and link objects in obs are extended in nobs for developing optical nodes and optical links. The ingress, core and egress node functionalities are combined into a common optical node architecture, which comprises agents responsible for burstification, routing and scheduling. The effects of burstification parameters, e.g., burstification timeout, burst size and number of burstification buffers per egress node, on tcp performance are investigated using nobs for different tcp versions and different network topologies.

An efficient simulation tool of performance evaluation for communication networks

We provide an efficient simulation tool for performance evaluation in communication networks. Not only the general simulation functions—which can be found in some old simulation tools, but also the perturbation function module via the Standard Clock (SC) approach—in which more than 2 perturbation simulation event paths can be constructed parallelly based on a single nominal simulation event path is included in this simulation software platform.

Transputer-based simulation tool for performance evaluation of wide area telecommunications networks

The paper presents the design of a high-speed network simulation machine, developed at Durham University. The simulator uses configured arrays of transputers to create a multiprocessor environment for the modelling of circuit and packet switched networks, taking advantage of the unique features of the transputer for parallel implementation of such models. The design divides easily into hardware and software considerations and the paper concludes with some initial results on performance and projections for the fully populated system.

A simulation tool for performance evaluation of the IBM 360/75

In this paper we present some results obtained from using simulation as a tool for evaluating alternative methods of improving system performance in network computers. We begin by describing a GPSS model which was developed to evaluate the current computer center operations at the University of Illinois. While using actual data from the center to verify that the model accurately predicts each job's total time in the system, we evaluate the resource utilization within the center. Then we use the simulator to show that a proposed dynamic priority assignment algorithm yields better throughput than the existing algorithm while maintaining a higher level of CPU and memory utilization. Next, turning our attention to a hypothetical network of three centers, we use a generalization of our model to demonstrate the effects of load leveling between centers on the total system throughput. Here we also explore the merits of “pay-for-priority” schemes in both a single center and in a network of three centers.

Letter to the Editor—A Proof of the Optimality of the Shortest Remaining Processing Time Discipline

Letter to the Editor—A Proof of the Optimality of the Shortest Remaining Processing Time Discipline