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We propose an analytic approach to the frequency bandwidth dimensioning problem, faced by cellular network operators who deploy/upgrade their networks in various geographical regions (countries) with an inhomogeneous urbanization. We present a model allowing one to capture fundamental relations between users' quality of service parameters (mean downlink throughput), traffic demand, the density of...
This paper presents a focus on the error propagation aspect which exists in interconnected networks. For handling the issues and considerations implied by this negative property, a method for ensuring fault tolerance and reliability of real-time routing processes is developed, specifying how this phenomenon's effects can be prevented. Real-time transmissions need a constant flow and require priority...
The aim of this paper is to present a model for the throughput of the 1-persistent CSMA protocol in underwater networks, where the typically large propagation delay with respect to the packet transmission time requires to take into account the spatial distribution of the nodes. Our model is developed based on the analysis carried out in [1] for the non-persistent CSMA protocol. Our results show that...
Multi-tiered transactional web applications are frequently used in enterprise based systems. Due to their inherent distributed nature, pre-deployment testing for high-availability and varying concurrency are important for post-deployment performance. Accurate performance modeling of such applications can help estimate values for future deployment variations as well as validate experimental results...
Recently, to evalute the Quality of Service (QoS) due to the high mobility and corrupted signal impact by the Additive White Gaussian Noise (AWGN) have become essential interest on the IEEE 1609.4 standard. In this work, we study the Two Ray Ground propagation channel caused by Additive White Gaussian Noise (AWGN) on the IEEE 1609.4 standard. We use ns 3.18 and VanetMobiSim for the evaluation of the...
Layered Queueing networks are a common method for solving performance models of modern distributed computer systems that use blocking remote procedure calls. Several analytic methods exist to solve these networks, many of which use the method of decomposition to break the model up into smaller, more easily solved submodels. Analytic solutions that break up a model must take into consideration interlocking,...
In this paper a WDM network architecture of passive star topology is presented that uses a set of control channels to exchange suitable control information in order to coordinate the data packets transmissions without channels collisions. The proposed synchronous access strategy effectively exploits the propagation delay parameter to eliminate the packet loss and to improve the system performance...
Wireless sensor networks (WSN) are used in many fields such as industrial control, building automation, environmental monitoring, etc. IEEE 802.15.4 standard defines the features of MAC layer and physical layer for WSN. Many analytical models studied the performance of the multihop IEEE 802.15.4 networks under the assumption of ideal wireless channel, and they did not consider the effect of imperfect...
This paper presents analytical expressions of network throughput for wireless 2-hop networks with tethering function at any offered load. Network throughputs can be obtained analytically by expressing collision probabilities and frame existence probabilities with respect to each node. The validities of the analytical expressions are confirmed from quantitative agreements between analytical and simulation...
Efforts were made to integrate emerging Vehicular Ad-hoc Network (VANETs) with the mobile internet architecture through Road Side Unit (RSU) to enhance its operational capabilities for safety and non safety applications. Transmission Control Protocol (TCP) is one of the prominent protocol that contributes a considerable amount of internet traffic as the vast majority of internet applications such...
BLE based Accessory-Smartphone communication (WBANs/WPANs), used for health-care, infotainment and many other applications, usually operate in dynamic environment (varying number of sensors, wireless conditions, etc.). These devices are typically configured in connection-oriented hub-and-spoke model with the Master controller. With an end-objective of optimizing the capacity of BLE (Bluetooth Low...
Non-beacon mode operation is included in IEEE 802.1.5.4 due to low overhead, energy efficient transmission and no tight synchronization requirement as compared to the beacon-mode transmissions. We model non beacon mode operation of an 802.15.4 unslotted CSMA/CA using Markov chain analysis for low data rate unsaturated traffic. Our modeling is reasonably detailed to capture an exact 802.15.4 system...
This paper presents the first comprehensive model of the 802.1laa intra-access category prioritization under saturated condition. We propose a 3D Markov chain to model the system and analyze several important QoS metrics, including throughput, delay, and frame drop ratio. The accuracy of our model is verified by extensive simulations. The results show that the 802.1laa can provide a finer grained...
Radio frequency (RF) energy harvesting capability allows wireless nodes to harvest and convert ambient RF signal into energy supply for their operations and data transmission. Cognitive radio networks can employ such capability that enables secondary users to opportunistically not only transmit data on an idle channel, but also harvest RF energy from primary users' transmission on a busy channel....
In international trade, the most widely used transportation form is the ocean freight. Port throughput forecasting is a important index for port construction and layout. In this paper, on the basis of Pearl Curve Model, GM (1,1) and Exponential Smoothing, we introduced the combinatorial forecasting model that incorporated the three. In the case of the cargo throughput of Dalian port as the example,...
The Delay/Disruption Tolerant Network (DTN) is characterized with intermittently connectivity and frequent partitions. Due to this, the DTN routing algorithm is very vulnerable to various kinds of malicious attacks. In this paper, combined with many other DTN forwarding approaches, we propose a multi-stage routing forwarding algorithm so as to further improve network throughput. To ensure the security...
Mobile Adhoc networks (MANET) are a group of mobile nodes that have the capability of maintaining a network without the need of centralized infrastructure. This concept has gained a lot of potential in various areas for data collection and data synchronization. Mobility and absence of any static network makes it very attractive for safety critical application. This paper discusses performance evaluation...
Cognitive Radio Network (CRN) aims to solve the problem of spectrum congestion by allowing opportunistic use of idle spectrum bands by secondary users (SUs) in the absence of primary users (PUs). Channel reservation policies have been proposed in this regard to ensure maximum throughput for these SUs, while minimizing their interference with PUs. However, these algorithms always reserve a fixed number...
Wireless communication has achieved great proliferation in communication technologies. IEEE 802.11 WLANs have been widely deployed as wireless access mechanism technology. To keep up with growing bandwidth and data rate requirements, legacy standards such as IEEE 802.11 have been deeply researched for their operation in multi-channel environment through usage of multiple interfaces. In the multi-channel...
Enabling vehicular communications is expected to revolutionize the transport infrastructure and support many traffic management applications such as platooning. Sharing vehicle information such as speed and acceleration wirelessly among platoons plays an effective role in platoon control by maintaining a constant inter-vehicle and inter-platoon distances. However, the performance of (inter and intra-)...
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