The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
SDN (Software Defined Network) is the important part of Future Network, and the OpenFlow soft switch which separates the control plane from the data plane is the key instrument. In this paper, the OpenFlow switch are analyzed, the main performance parameters are throughput, packet loss and time-delay, the influence factors are load, packet size and the transforming packet quantity. Kernel Partial...
The proliferation of smartphones has unleashed a tremendous growth in wireless traffic, which is projected to continue for the foreseeable future, and put yet greater strain on the capacity of cellular networks. Deployment of pico base stations, reducing cell sizes and allowing more efficient reuse of limited radio spectrum, provides a powerful approach to cope with traffic hot spots and bring capacity...
Due to high mobility of nodes, the major challenge of mobile ad hoc networks (MANETs) is the frequent link breakages which lead to numerous path failures and route discoveries. This paper introduces a novel signal strength based algorithm for RREQs forwarding (SAODV) to better exploit the neighbor coverage knowledge and hence reduce routing overhead in MANETs. The simulation results confirm the efficiency...
In mobile communication networks under bursty traffic conditions the interference experienced by the users varies constantly. Therefore, the periodic reporting of channel state information becomes inaccurate and the link adaptation performance deteriorates. In this work, a coordinated scheduling scheme is proposed to improve the link adaptation performance of a non-fully loaded network in the downlink...
In this paper, a flow-level traffic model for evaluating Long Term Evolution Advanced networks is presented. The model includes the characteristics of the Transmission Control Protocol version Cubic. Live network measurements of flow and user data volumes in the busy hour were used to parameterize the presented statistical model. Furthermore, an approach for combining LTE-Advanced system-level simulation...
IEEE 802.11ah is a new Wi-Fi draft for sub-1Ghz communications, aiming to address the major challenges of the Internet of Things (IoT): connectivity among a large number of power-constrained stations deployed over a wide area. The new Restricted Access Window (RAW) mechanism promises to increase throughput and energy efficiency by dividing stations into different RAW groups. Only the stations in the...
Nowadays the digital universe becomes larger and larger. The data created everyyear has been up to ZB level. How to store thedata in many normal servers is a critical issue. Although a distributed file system alleviates thestorage problem, there is still a need to reducethe storage and speed up transmission of largescale data. The distributed file system like HDFSalready offers compression schemes...
In this paper, a random access with priority protocol named irregular repetition slotted ALOHA with priority (PIRSA) is introduced. By optimizing the packets repetition and using successive interference cancellation (SIC), irregular repetition slotted ALOHA (IRSA) has achieved a high throughput. Contention resolution diversity slotted ALOHA with access control (AC-CDRSA) enhances both throughput and...
Frame aggregation (FA) mechanisms improve the throughput of WLANs. In this paper, the effect of the FA mechanism on the throughput of wireless local area networks (WLANs) has been investigated. To this end, we propose an analytical model in order to analyze an IEEE 802.11n network comprised of an access point (AP) and several conventional nodes (CNs), all in the coverage area of each other. With respect...
Wireless Sensor Networks (WSNs) have generated a great interest for industrial and have enabled new applications in different domains. In this paper, we present a PHY/MAC/Network analytic model for asymmetric multihop WSNs using the unslotted IEEE802.15.4 protocol and a weighted fair queuing (WFQ) scheduling that models the forwarding capability of sensors. This model can be used for cross-layer optimization...
Cross-layer design with respect to reference layered architecture is the design of algorithms, protocols and architectures that utilize an available set of interlayer exchanges a superset of the standard interfaces provided by the reference layered architecture. The cross layer approach transports feedback, dynamically via the layer margins to enable the remuneration for e.g. load, latency or other...
This paper presents a comparative study between NS-2 and OPNET Modeler simulators focusing on the performance evaluation of the IEEE 802.11b technology on ad-hoc networks. Moreover, the research tests the throughput of WLAN ad-hoc network against the change in the number of nodes via simulation using OPNET Modeler and NS-2, and then compares that with reference to Bianchi Equations. From the results...
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) adopted in IEEE 802.11 WLAN suffers from serious problems of hidden terminal and exposed terminal. This will get worse if the environment becomes highly dense. The rise of channel interference among stations (STA) and the deterioration of the total network throughput as the result of these terminal problems need to be mitigated. A possible...
Self-backhaul is flexible and cost efficient for ultra dense network (UDN) since it provides backhaul using the same wireless technology as access link. Content prediction and caching can lower the load on backhaul and improve user experience. Therefore, an algorithm named tri-stage fairness (TSF) is proposed to solve the resource allocation problem in UDN with self-backhaul and caching, in which...
Achievable networking performance of applications in a supercomputer depends on the exact combination of the communication patterns of the applications and the routing algorithms used by the supercomputer. In order to achieve the highest networking performance for the applications, the routing algorithms need to be designed optimally for those communication patterns. However, while communication patterns...
Wireless Sensor Network (WSN) is a group of the specialized wireless devices which forms a communication infrastructure at a diverse location. IEEE 802.15.4 standard for wireless devices like ZigBee has demonstrated its enormous application as WSN. ZigBee has got popularity for its both small range and wide range coverage. In wide range coverage, a large scale ZigBee network deployment is going ahead...
Social needs and demand changes fuel the technology to rise and meet those needs. Nowadays, users of wireless network communications tend to use their small size, limited powered mobile devices to access multimedia services with good quality of service anytime, anywhere. This implies more power consumption and raises the need for energy efficiency in doing more work with less power consumption. WiMAX...
A significant number of previous studies have shown, however, network traffic exhibited frequently large bursty traffic possesses self-similar properties. For the future applications of wireless sensor networks (WSNs) with large number of cluster structures, such as Internet of Things (IoT) and smart grid, the network traffic should not be assumed as conventional Poisson process. We thus employ ON/OFF...
New scheduling algorithms are first evaluated using simulation. In these simulations, the workload has a huge influence on the measured performance of the simulated system. Therefore, it is customary to use workload traces recorded previously from real systems. Such open-system simulations preserve all the jobs' properties. However, preserving the jobs' arrival times actually destroys the logic of...
The military organizations around the world are increasingly adopting commercial cellular standards for their mission critical communication networks. Most of the cellular standards include support for several new techniques to implement network-wide load balancing to obtain optimum network performance. The goal of this paper is to understand the effect of load balancing on key performance indicators...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.