scholarly journals Time-Dependent Performance of a Multi-Hop Software Defined Network

2021 ◽  
Vol 11 (6) ◽  
pp. 2469
Author(s):  
Tadeusz Czachórski ◽  
Erol Gelenbe ◽  
Godlove Suila Kuaban ◽  
Dariusz Marek
Keyword(s):  
Packet Loss ◽  
Network Optimization ◽  
Transient Analysis ◽  
Network Performance ◽  
Computation Time ◽  
Software Defined Network ◽  
Transient Effects ◽  
Statistical Accuracy ◽  
Design Of Algorithms ◽  
Transient Behaviour

It has been recently observed that Software Defined Networks (SDN) can change the paths of different connections in the network at a relatively frequent pace to improve the overall network performance, including delay and packet loss, or to respond to other needs such as security. These changes mean that a network that SDN controls will seldom operate in steady state; rather, the network may often be in transient mode, especially when the network is heavily loaded and path changes are critically important. Hence, we propose a transient analysis of such networks to better understand how frequent changes in paths and the switches’ workloads may affect multi-hop networks’ performance. Since conventional queueing models are difficult to solve for transient behaviour and simulations take excessive computation time due to the need for statistical accuracy, we use a diffusion approximation to study a multi-hop network controlled by SDN. The results show that network optimization should consider the transient effects of SDN and that transients need to be included in the design of algorithms for SDN controllers that optimize network performance.

scholarly journals Software Defined Network for Qos Enhancement in Mobile Wi-Fi Network

2019 ◽  
Vol 8 (3) ◽  
pp. 4863-4868 ◽  
Keyword(s):  
Network Optimization ◽  
Network Performance ◽  
Fast Response ◽  
Direct Access ◽  
The Internet ◽  
Software Defined Network ◽  
Control Plan ◽  
High Bandwidth ◽  
Network Performance Evaluation ◽  
The Impact

Wi-FI has become one of the dominant technology for direct access to the Internet due to its expanded services offering, its simplicity and its high-bandwidth provisioning that gives a capacity to support high traffic. Software-defined network (SDN) architecture simplified network management through an automatically programmed network. It provides a separation between the control plan (Controller) and the data plan (Switch) functions of the networks, this allows network optimization and fast response to network changes without the need to manually reconfigure existing infrastructure or purchase new hardware. In this paper, we have proceeded by studying the exchanges during a mobility within a WI-FI-based SDN network, then a network performance evaluation has been performed in order to analyze the impact of introducing the SDN concept on the performance of a mobile Wi-Fi network. For all proposed scenarios, we notice that the Wi-Fi-Based SDN architecture gives better results than in the case of the traditional Wi-Fi network.

scholarly journals ANALYSIS OF USER MOBILITY PERFORMANCE ON SOFTWARE DEFINED WIRELESS NETWORK USING DIJKSTRA ALGORITHM

2021 ◽  
Vol 2 (2) ◽  
pp. 127-133
Author(s):  
Icha Nurlaela Khoerotunisa ◽  
Sofia Naning Hertiana ◽  
Ridha Muldina Negara
Keyword(s):  
Wireless Network ◽  
Packet Loss ◽  
Network Performance ◽  
User Mobility ◽  
Dijkstra Algorithm ◽  
High Complexity ◽  
Quality Of Data ◽  
Data Packets ◽  
Mobility Performance

  Over the last decade, wireless devices have developed rapidly until predictions will develop with high complexity and dynamic. So that new capabilities are needed for wireless problems in this problem. Software Defined Network (SDN) is generally a wire-based network, but to meet the needs of users in terms of its implementation, it has begun to introduce a Wireless-based SDN called Software Defined Wireless Network (SDWN) which provides good service quality and reach and higher tools, so as to be able to provide new capabilities to wireless in a high complexity and very dynamic. When SDN is implemented in a wireless network it will require a routing solution that chooses paths due to network complexity. In this paper, SDWN is tested by being applied to mesh topologies of 4,6 and 8 access points (AP) because this topology is very often used in wireless-based networks. To improve network performance, Dijkstra's algorithm is added with the user mobility scheme used is RandomDirection. The Dijkstra algorithm was chosen because it is very effective compared to other algorithms. The performance measured in this study is Quality of Service (QoS), which is a parameter that indicates the quality of data packets in a network. The measurement results obtained show that the QoS value in this study meets the parameters considered by the ITU-T G1010 with a delay value of 1.3 ms for data services and packet loss below 0.1%. When compared with the ITU-T standard, the delay and packet loss fall into the very good category.

THE TRANSIENT EFFECTS OF FLOOD WATER ON A WARSHIP IN CALM WATER IMMEDIATELY FOLLOWING DAMAGE

2021 ◽  
Vol 152 (A4) ◽  
Author(s):  
G J Macfarlane ◽  
M R Renilson ◽  
T Turner
Keyword(s):  
Equilibrium Position ◽  
Upright Position ◽  
Water Levels ◽  
Transient Effects ◽  
Roll Damping ◽  
Transient Motion ◽  
Flood Water ◽  
Transient Behaviour ◽  
Calm Water ◽  
The Way

The safety of a ship which is damaged below the waterline will depend on the way water floods into the internal compartments. The water will cause the ship to take on an angle of heel and trim which will further affect the flooding into the compartments. The ship’s equilibrium position in calm water can be predicted using hydrostatic theory, however at present it is difficult to predict the transient behaviour between the initial upright position of the ship and its final equilibrium. In some cases, the transient motion may cause a capsize prior to a possible equilibrium position being reached. This paper describes an investigation of this phenomenon using a model of a warship with simplified, typical internal geometry. With the model initially stationary, a rapid damage event was generated, and the global motions measured, along with the water levels in some of the internal compartments, as functions of time. Immediately after the damage occurred the model rolled to starboard (towards the damage). It then rolled to port (away from the damage) before eventually returning to starboard and settling at its equilibrium value. In all the tests conducted the equilibrium heel angle was less than that reached during the initial roll to starboard. This implies that the roll damping, and the way in which the water floods into the model immediately following the damage, could both have a very important influence on the likelihood of survival.

scholarly journals A Remote Testbed System for Mobile Ad-hoc/Sensor Networks

2015 ◽  
Vol 11 (9) ◽  
pp. 22
Author(s):  
Jun Yin ◽  
Yuwang Yang ◽  
Xiayun Hu ◽  
Yanxiang Yin
Keyword(s):  
Sensor Networks ◽  
Packet Loss ◽  
High Speed ◽  
Network Performance ◽  
Ad Hoc ◽  
Main Idea ◽  
Software Simulation ◽  
Rotary Platform ◽  
Mobile Ad Hoc ◽  
Ad Hoc Sensor Networks

Nodes in a mobile ad-hoc/sensor networks (MANET) can move at any speed and direction independently. Thus, it's difficult to design a testbed system for network working under such circumstance. Different with traditional software simulation or vehicle-loaded methods, a remote network performance testbed system is proposed in this paper. The main idea of our proposed system is using the rotary motion to create such velocity-changing context. We designed and realized two high speed rotary turntable platforms. Nodes can be deployed on the rotary platform during test, thus it can movement at a speed upto 168 km/h in our testbed system. The operator can remotely monitor the test and receive the testing results simultaneously. Shown by the experiments, the approach is simple, efficient and reliable. In addition, the reason of network packet loss in our testbed is also analysed and tested in this research.

Network Performance Comparison between Linear and Hybrid Topology Structure of WSN in Coal Mining Equipment

2012 ◽  
Vol 548 ◽  
pp. 775-779
Author(s):  
Hong Liang Gao ◽  
Bing Wen Wang ◽  
Chao Gao ◽  
Xiao Ya Hu
Keyword(s):  
Coal Mine ◽  
Packet Loss ◽  
Network Performance ◽  
Loss Rate ◽  
Packet Loss Rate ◽  
Mine Safety ◽  
Mining Equipment ◽  
Linear Topology ◽  
Hybrid Topology ◽  
Average Transmission

This paper analyzes the characteristics of current monitoring wireless sensor networks for coal mine safety and two kinds of typical system network architecture of mining working face in coal mine firstly, and then analyzes the network performance of the two kinds of network system theoretically. In order to compare the performance of WSN adopting linear topology and hybrid topology, we build the simulation model using NS2 to evaluate the performance through three indexes, i.e. total energy consumption, packet loss rate and average transmission latency. The research results show that the network adopting hybrid topology has better energy efficiency, and the network adopting linear topology has better performance in packet loss rate and average transmission latency.

The Parameters Measurement of the Network Performance

2013 ◽  
Vol 380-384 ◽  
pp. 850-853
Author(s):  
Xia Li
Keyword(s):  
Packet Loss ◽  
Network Performance ◽  
Flow Data ◽  
Connection Number ◽  
Active Method ◽  
Delay Jitter ◽  
Measurement Results ◽  
Test Flow ◽  
Parameters Measurement

By using active method of injecting test flow data into the network the parameters of throughput, bandwidth, delay jitter, packet loss can be gained, UDP network performance of the single network segment can be tested. According to the measurement results, the network should be properly distributed for the access connection number and allocation of bandwidth for each client to improve the network performance.

scholarly journals Optimization of Universitas Riau Data Network Management Using Software Defined Network (SDN)

2019 ◽  
Vol 2 (3) ◽  
pp. 10-14
Author(s):  
Ery Safrianti ◽  
Linna Oktaviana Sari ◽  
Rian Arighi Mahan
Keyword(s):  
Quality Of Service ◽  
Network Management ◽  
Packet Loss ◽  
Computer Network ◽  
Network Technology ◽  
Software Defined Network ◽  
Measurement Results ◽  
Simulation Results ◽  
The University

Computer networks are one of the main parts in the telecommunications system. To support reliable network technology, a centralized network is needed so that network traffic can be managed more easily. Software-Defined Network (SDN) technology is a centralized network that provides a separation between control planes and data planes in different systems. This study discusses the optimization of network management at the University of Riau (UNRI) using SDN. Optimization is done by designing a UNRI computer network in the form of SDN then simulated using the Mininet. Quality of Service (QoS) analysis is performed from the measurement results using Wireshark. The network simulation results give a delay value of 0.506 ms, 0% packet loss, the throughput of 590,392 Mb / s and jitter of 0.093 ms. The SDN network provides better delay and jitter performance compared to conventional UNRI networks with a delay value of 13,874 ms, 0% packet loss, 635.1 Mb/s throughput and 2.6 ms jitter. UNRI's SDN network design is worth considering because it has better QoS values, delay, and jitter below ITU standards and conventional networks.

scholarly journals Estimation of the ABW for Mobile Broadband over SDN using SFC-Constrained Shortest Path Algorithm

2019 ◽  
Vol 9 (1) ◽  
pp. 4282-4286
Keyword(s):  
Network Performance ◽  
Computer Network ◽  
Convergence Time ◽  
Software Defined Network ◽  
Bandwidth Utilization ◽  
Mobile Broadband ◽  
Novel Approach ◽  
Shortest Distance ◽  
Wide Range ◽  
Network Transformation

Software-Defined Networking (SDN) is an evolving algorithm which is depended upon the computer network transformation. In SDN, Bandwidth Utilization is a critical aspect to enhance network performance. To obtain the accessible bandwidth for the Mobile Broadband over SDN and in sequence enhance the accessible Mobile Broadband is the main objective. A significant characteristic is ABW (ABW), having a robust influence on a wide range of applications. However, this metric is very complex to estimate using traditional or conventional methodologies. The Traditional Bandwidth Estimation Technique has limited accuracy along with huge convergence time. The Estimation Time cannot be predicted as it depends on the existence of appropriate traffic produced through any thirdparty applications. 50% of Systematic Errors are not uncommon. In order to overcome the above-mentioned issues, in this paper, a novel approach is introduced for the estimation of ABW over SDN using three different scenarios. In which, SFC constraint shortest distance algorithm is employed for solving the classical max-flow issue that occurs in multiple scenarios while evaluating the ABW. The experiment result is carried out using Mininet testbed for network emulation and Floodlight as an SDN controller. Some of the interesting cases are considered, and the ABW is measured for the proposed software-defined network and compared with the existing traditional network and existing software-defined network

scholarly journals A SOLUTION TO SELECTIVE FORWARD ATTACK IN WIRELESS SENSOR NETWORK

2018 ◽  
Vol 6 (2) ◽  
pp. 25-30 ◽  
Author(s):  
Gulbir Singh ◽  
Om Prakash Dubey ◽  
Gautam Kumar
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Packet Loss ◽  
Network Performance ◽  
Mesh Network ◽  
Wireless Sensor ◽  
Sybil Attack ◽  
Trust Value ◽  
Selective Forwarding ◽  
The Many

Wireless mesh network represent a solution to provide wireless connectivity. There is some attacks on wireless sensor networks like black hole attack, sinkhole attack, Sybil attack, selective forwarding, etc. In this paper, we will concentrate on selective forwarding attack. Selective Forwarding Attack is one of the many security threats in wireless sensor networks which can degrade network performance. An adversary on the transmission path selectively drops the packet. The adversary same time transfers the packet, while in a few occasions it drops the packet. It is difficult to detect this type of attack since the packet loss may be due to unreliable wireless communication. The proposed scheme is based on the trust value of each node. During data transmission, a node selects a downstream node that has highest trust value, which is updated dynamically based on the number of packets a node has forwarded and dropped. We compared our scheme with the existing scheme and found that the packet loss in the proposed scheme is much less than the existing scheme.

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