Download or read book Performance Modeling Analysis and Optimization of Self organized Packet Radio Ad Hoc Networks with Cellular Overlay written by Ali N. Zadeh and published by . This book was released on 2002 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Performance Modeling of Ad Hoc Networks with Multi cell Overlapping Interference written by Xiaoyu Wang and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile ad hoc networks are non-infrastructure-based wireless networks which are expected to be an important part of 4G architecture. In this type of network, nodes are both source of information as well as they participate in relaying the information to their final destinations. Due to the broadcast nature of wireless transmission, mobile ad hoc networks require an effective MAC protocol to share the medium. In recent years, many MAC protocols have been proposed in the literature for this purpose, such as Dual Busy Tone Multiple Access (DBTMA) [3] protocol. In this thesis, we first propose to modify DBTMA protocol through inserting a third busy tone, BTd (data transmit busy tone) to protect data transmissions and the modified protocol is referred to as Triple-BTMA (T-BTMA). Second, we show that the existing performance model of DBTMA fails to consider the effects of multi-cell overlapping interference. The main contribution of this thesis is development of a performance analysis of T-BTMA protocol that takes into account properly the multi-cell overlapping interference. We show that our model may also be adopted for most Ready-to-Send/Clear-to-Send (RTS/CTS) based MAC protocols. We develop a simulation environment to validate approximations in our mathematical model. We find that theoretical results are in agreement with those of simulations. Finally, we extend our model into power-controlled networks and it is shown that a proper power control can lead to an ideal channel throughput.
Download or read book Robust and Low Communication Geographic Routing for Wireless Ad Hoc Networks written by Matthias Witt and published by Cuvillier Verlag. This book was released on 2008 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Modeling Performance Analysis and Design of Spatially Distributed Spread Spectrum Packet Radio Networks written by Thomas D. Papavassiliou and published by . This book was released on 1992 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contributions to Scalable Wireless Ad Hoc Networks Supporting Quality of Service written by Arasch Honarbacht and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile ad hoc networks, also known as multihop or mesh networks, are gaining more and more attention these days. Originally designed for military applications, the idea of spontaneous communication using direct links to immediate neighbors has rapidly spread over to the civilian sector. This book focuses on the design of large-scale wireless multihop networks supporting quality-of-service. Based on an in-depth analysis of state-of-the-art architectures, the novel idea of cut-through/cell-switching is pointed out. Enhancements to the standard IEEE 802.11 DCF are presented as basic elements of diversified management protocols. An innovative approach to distributed dynamic channel assignment is introduced and benchmarked against one of the most powerful centralized algorithms known to date. Moreover, wireless sensor networks are identified as a new field of application for the classic Kalman filter.Finally, a new integrated R&D platform has been developed and is also part of the presentation. It consists of a simulation environment written in C++ and a software defined radio transceiver. The latter is based on an architecture employing the latest in digital signal processing: a general purpose DSP accompanied by FPGAs, dedicated digital up-/down converter ASICs, high-performance ADCs and DACs.
Download or read book Mobile Ad Hoc Networks written by G Ram Mohana Reddy and published by CRC Press. This book was released on 2016-08-19 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, a lot of work has been done in an effort to incorporate Swarm Intelligence (SI) techniques in building an adaptive routing protocol for Mobile Ad Hoc Networks (MANETs). Since centralized approach for routing in MANETs generally lacks in scalability and fault-tolerance, SI techniques provide a natural solution through a distributed approach for the adaptive routing for MANETs. In SI techniques, the captivating features of insects or mammals are correlated with the real world problems to find solutions. Recently, several applications of bio-inspired and nature-inspired algorithms in telecommunications and computer networks have achieved remarkable success. The main aims/objectives of this book, "Mobile Ad Hoc Networks: Bio-Inspired Quality of Service Aware Routing Protocols", are twofold; firstly it clearly distinguishes between principles of traditional routing protocols and SI based routing protocols, while explaining in detail the analogy between MANETs and SI principles. Secondly, it presents the readers with important Quality of Service (QoS) parameters and explains how SI based routing protocols achieves QoS demands of the applications. This book also gives quantitative and qualitative analysis of some of the SI based routing protocols for MANETs.
Download or read book Protocol Design and Performance Evaluation for Wireless Ad Hoc Networks written by Fei Tong and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Benefiting from the constant and significant advancement of wireless communication technologies and networking protocols, Wireless Ad hoc NETwork (WANET) has played a more and more important role in modern communication networks without relying much on existing infrastructures. The past decades have seen numerous applications adopting ad hoc networks for service provisioning. For example, Wireless Sensor Network (WSN) can be widely deployed for environment monitoring and object tracking by utilizing low-cost, low-power and multi-function sensor nodes. To realize such applications, the design and evaluation of communication protocols are of significant importance. Meanwhile, the network performance analysis based on mathematical models is also in great need of development and improvement.This dissertation investigates the above topics from three important and fundamental aspects, including data collection protocol design, protocol modeling and analysis, and physical interference modeling and analysis. The contributions of this dissertation are four-fold.First, this dissertation investigates the synchronization issue in the duty-cycled, pipelined-scheduling data collection of a WSN, based on which a pipelined data collection protocol, called PDC, is proposed. PDC takes into account both the pipelined data collection and the underlying schedule synchronization over duty-cycled radios practically and comprehensively. It integrates all its components in a natural and seamless way to simplify the protocol implementation and to achieve a high energy efficiency and low packet delivery latency. Based on PDC, an Adaptive Data Collection (ADC) protocol is further proposed to achieve dynamic duty-cycling and free addressing, which can improve network heterogeneity, load adaptivity, and energy efficiency. Both PDC and ADC have been implemented in a pioneer open-source operating system for the Internet of Things, and evaluated through a testbed built based on two hardware platforms, as well as through emulations.Second, Linear Sensor Network (LSN) has attracted increasing attention due to the vast requirements on the monitoring and surveillance of a structure or area with a linear topology. Being aware that, for LSN, there is few work on the network modeling and analysis based on a duty-cycled MAC protocol, this dissertation proposes a framework for modeling and analyzing a class of duty-cycled, multi-hop data collection protocols for LSNs. With the model, the dissertation thoroughly investigates the PDC performance in an LSN, considering both saturated and unsaturated scenarios, with and without retransmission. Extensive OPNET simulations have been carried out to validate the accuracy of the model.Third, in the design and modeling of PDC above, the transmission and interference ranges are defined for successful communications between a pair of nodes. It does not consider the cumulative interference from the transmitters which are out of the contention range of a receiver. Since most performance metrics in wireless networks, such as outage probability, link capacity, etc., are nonlinear functions of the distances among communicating, relaying, and interfering nodes, a physical interference model based on distance is definitely needed in quantifying these metrics. Such quantifications eventually involve the Nodal Distance Distribution (NDD) intrinsically depending on network coverage and nodal spatial distribution. By extending a tool in integral geometry and using decomposition and recursion, this dissertation proposes a systematic and algorithmic approach to obtaining the NDD between two nodes which are uniformly distributed at random in an arbitrarily-shaped network.Fourth, with the proposed approach to NDDs, the dissertation presents a physical interference model framework to analyze the cumulative interference and link outage probability for an LSN running the PDC protocol. The framework is further applied to analyze 2D networks, i.e., ad hoc Device-to-Device (D2D) communications underlaying cellular networks, where the cumulative interference and link outage probabilities for both cellular and D2D communications are thoroughly investigated.
Download or read book Modeling and Performance Analysis for Mobile Group Localization and Formation written by Dan Paul Denson and published by . This book was released on 2008 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years wireless networking based on radio frequency (RF) technology has become common place. Applications for wireless technologies have emerged in nearly all types of industry where data must be accessed, shared, and processed in real time by potentially mobile computer clients. Wireless networking is especially useful where time or environmental constraints limit the user's ability to establish a wired infrastructure. One example of this type of scenario is battle field deployment of mobile sensor networks. In this case a military force has limited time to deploy a network of mobile sensor nodes, capable of gathering, processing, and transmitting data to a central base station where it can be used to make strategic decisions. When such a network is deployed, it is usually formed as an ad-hoc network. That is, the network is established and maintained without the use of any fixed switching or routing equipment. Efficient deployment of a mobile ad-hoc network is dependent on addressing a number of issues which are typically absent in infrastructure based networks like wired and cellular networks. In this work, two issues, localization and mobility pattern formation are addressed while taking into account the direct impacts of terrain topology, mobility patterns, data traffic patterns, radio interference patterns, and power limitations. A localization algorithm which requires that only a single node be equipped with on-board GPS hardware is developed. The localization algorithm is shown to reduce the detrimental impact of radio interference patterns. Next, a mobility profile with a cluster formation algorithm which minimizes pattern formation error, power consumption, and network congestion is developed. The algorithms are implemented using a discrete event simulator and their performance is presented.
Download or read book Multi hop Wireless Ad Hoc Networks written by Ikhlas Ajbar and published by . This book was released on 2009 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Methodologies for Performance Modeling of Routing Protocols in Wireless Networks written by Andres Medina and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile wireless ad-hoc networks (MANETs) are being designed to be a key element in future battlefield communications, as well as a supplement to cellular networks. As a consequence of rapid changes in the topology of the network, routing packets in MANETs is a challenging task that has attracted considerable attention. However a comprehensive performance evaluation of routing protocols remains an open problem. This dissertation proposes a novel methodology for the performance evaluation of routing protocols for MANETs. The method is based on a "Divide and Conquer" approach and it provides a systematic and disciplined way to evaluate the performance of routing protocols. The full routing system is decomposed into components (subsystems). Performance models are developed for each component. Then, the performance model of the full system is the interconnection of the performance models of the components. The component based approach makes practical the performance evaluation of routing protocols, by allowing researchers to reuse a subset of the previous developed models to evaluate the performance of new ideas.
Download or read book Dimensioning Cell Site Planning and Self Organization of 4G Radio Networks written by Alexander Engels and published by . This book was released on 2013 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book QEX written by and published by . This book was released on 2006 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Modelling and QoS Support for Wireless Ad Hoc Networks written by Khalid M. Jamil Khayyat and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a Markov chain analysis for studying the performance of wireless adhoc networks. The models presented in this dissertation support an arbitrary backoffstrategy. We found that the most important parameter affecting the performance ofbinary exponential backoff is the initial backoff window size. Our experimental resultsshow that the probability of collision can be reduced when the initial backoff windowsize equals the number of terminals. Thus, the throughput of the system increasesand, at the same time, the delay to transmit the frame is reduced. In our second contribution, we present a new analytical model of a MediumAccess Control (MAC) layer for wireless ad hoc networks that takes into accountframe retry limits for a four-way handshaking mechanism. This model offers flexibility to address some design issues such as the effects of traffic parameters as well aspossible improvements for wireless ad hoc networks. It effectively captures importantnetwork performance characteristics such as throughput, channel utilization, delay, and average energy. Under this analytical framework, we evaluate the effect of theRequest-to-Send (RTS) state on unsuccessful transmission probability and its effect onperformance particularly when the hidden terminal problem is dominant, the traffic isheavy, or the data frame length is very large. By using our proposed model, we showthat the probability of collision can be reduced when using a Request-to-Send/Clear-to-Send (RTS/CTS) mechanism. Thus, the throughput increases and, at the sametime, the delay and the average energy to transmit the frame decrease. In our third contribution, we present a new analytical model of a MAC layer forwireless ad hoc networks that takes into account channel bit errors and frame retrylimits for a two-way handshaking mechanism. This model offers flexibility to addressdesign issues such as the effects of traffic parameters and possible improvements forwireless ad hoc networks. We illustrate that an important parameter affecting theperformance of binary exponential backoff is the initial backoff window size. We showthat for a low bit error rate (BER) the throughput increases and, at the same time, the delay and the average energy to transmit the frame decrease. Results show alsothat the negative acknowledgment-based (NAK-based) model proves more useful fora high BER. In our fourth contribution, we present a new analytical model of a MAC layerfor wireless ad hoc networks that takes into account Quality of Service (QoS) ofthe MAC layer for a two-way handshaking mechanism. The model includes a highpriority traffic class (class 1) and a low priority traffic class (class 2). Extension ofthe model to more QoS levels is easily accomplished. We illustrate an importantparameter affecting the performance of an Arbitration InterFrame Space (AIFS) andsmall backoff window size limits. They cause the frame to start contending the channelearlier and to complete the backoff sooner. As a result, the probability of sending theframe increases. Under this analytical framework, we evaluate the effect of QoS onsuccessful transmission probability and its effect on performance, particularly whenhigh priority traffic is dominant.
Download or read book Packet Radio Networks written by Clifford A. Lynch and published by Pergamon. This book was released on 1987 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Packet Scheduling and Performance Modeling of Optical and Wireless Networks written by Zhenghao Zhang and published by . This book was released on 2006 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our second major topic is a two-layered heterogeneous wireless sensor network, where the network is partitioned into clusters, and a powerful cluster head controls all sensors in a cluster. Such network has better scalability, lower cost, and longer network life than other types of networks. We mainly focus on the energy efficient design within a cluster to prolong network lifetime. To reduce the energy consumption, we use polling to collect data from sensors instead of letting sensors send data randomly. We show that the problem of finding a minimum time contention-free polling schedule is NP-hard, and give a fast on-line algorithm to solve it approximately. We also conduct simulations on the NS-2 simulator and show that our polling scheme achieves 100% throughput even when the sensor's active time is not long.
