Medium Access Control Protocols In Mobile Ad Hoc Networks Using Directional Antennas

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Medium Access Control Protocols In Mobile Ad Hoc Networks Using Directional Antennas

Author : Uma Reddy Sappidi
ISBN : OCLC:841572831
Genre :
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A mobile ad hoc network is a collection of mobile terminals equipped with wireless transceivers that form an autonomous network without any pre-planned infrastructure or centralized administration. Because of its constantly changing topology and limited battery power, the major challenging issue in such networks is the medium access control (MAC). Traditionally, mobile ad hoc networks use omnidirectional antennas. However, the use of directional antennas may potentially improve the MAC performance and decrease the power consumption in the nodes. The purpose of our research is to design some novel MAC protocols for mobile ad hoc networks using directional antennas and evaluate their performances.

Ad Hoc Networks

Author : Prasant Mohapatra
ISBN : 0387226907
Genre : Technology & Engineering
File Size : 33.44 MB
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AD HOC NETWORKS: Technologies and Protocols is a concise in-depth treatment of various constituent components of ad hoc network protocols. It reviews issues related to medium access control, scalable routing, group communications, use of directional/smart antennas, network security, and power management among other topics. The authors examine various technologies that may aid ad hoc networking including the presence of an ability to tune transmission power levels or the deployment of sophisticated smart antennae. Contributors to this volume include experts that have been active in ad hoc network research and have published in the premier conferences and journals in this subject area. AD HOC NETWORKS: Protocols and Technologies will be immensely useful as a reference work to engineers and researchers as well as to advanced level students in the areas of wireless networks, and computer networks.
Category: Technology & Engineering

A Mac Layer Protocol For Wireless Ad Hoc Networks Using

Author : Sultan Budhwani
ISBN : OCLC:725498507
Genre :
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Using directional antenna in ad hoc networks, offer many benefits in contrast to their classical omni-directional counterparts. The most important benefits are the significant improvement in spatial reuse, reduction of the radio interference, increase in coverage range and subsequently an increase in network capacity on the whole. On the other hand, directional transmission increases the hidden terminal problem and the problem of deafness. To best utilize directional antennas, a suitable Medium Access Control (MAC) protocol must be designed. Current MAC protocols, such as the IEEE 802.11 standard for Wireless LANs, assume the omni-directional antenna at its Physical layer and thus do not fully exploit the capabilities of a directional antenna. In this thesis, we propose a MAC protocol for wireless ad hoc networks which fully exploits the potentials of directional antennas. The first part of our design studies the issues related to directional MAC protocols and we use this knowledge to carefully design the proposed MAC protocol for ad hoc networks using directional antennas. We evaluate our work through simulation studies performed on the network simulator - NS2. Numerical results obtained are promising and show that our protocol offers significant improvement in throughput when compared to the performance of traditional 802.11 MAC protocol and D-MAC which is a Directional MAC protocol for ad hoc networks.

Wireless Network Performance Enhancement Via Directional Antennas Models Protocols And Systems

Author : John D. Matyjas
ISBN : 9781498707541
Genre : Technology & Engineering
File Size : 25.28 MB
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Directional antenna technologies have made significant advancements in the last decade. These advances have opened the door to many exciting new design opportunities for wireless networks to enhance quality of service (QoS), performance, and network capacity. In this book, experts from around the world present the latest research and development in wireless networks with directional antennas. Their contributed chapters provide detailed coverage of the models, algorithms, protocols, and applications of wireless networks with various types of directional antennas operating at different frequency bands. Wireless Network Performance Enhancement via Directional Antennas: Models, Protocols, and Systems identifies several interesting research problems in this important field, providing an opportunity to learn about solid solutions to these issues. It also looks at a number of practical hardware designs for the deployment of next-generation antennas, as well as efficient network protocols for exploitation of directional communications. The book is organized into six sections: Directional Antennas – covers the hardware design of different types of antennas Directional MAC – focuses on the principles of designing medium access control (MAC) protocols for directional networks Millimeter Wave – explores different design aspects of millimeter wave (mm-Wave) systems, which operate in higher-frequency bands (such as 60 GHz) MIMO – explains how to establish a multiple-input, multiple-output (MIMO) antenna system and describes how it operates in a cognitive radio network Advanced Topics – looks at additional topics such as beamforming in cognitive radio networks, multicast algorithm development, network topology management for connectivity, and sensor network lifetime issues Applications – illustrates some important applications, such as military networks and airborne networking, that benefit from directional networking designs With this book, researchers and engineers will be well-equipped to advance the research and development in this important field. If you’re new to this field, you will find this book to be a valuable reference on basic directional networking principles, engineering design, and challenges.
Category: Technology & Engineering

Protocols For Mobile Ad Hoc Networks

Author : Kai Li
ISBN : OCLC:841572555
Genre : Mobile agents (Computer software)
File Size : 49.5 MB
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ABSTRACT: A mobile ad hoc network is a collection of mobile terminals equipped with wireless transceivers that form an autonomous network without any pre-planned infrastructure or centralized administration. Because of its constantly changing topology, the major challenging issues in such network are the medium access control (MAC) and routing protocols. The purpose of our research is to design some novel protocols for mobile ad hoc networks and evaluate their performances. In this dissertation, we first develop an accurate model for wireless packet transmission and reception in an ad hoc network environment. We implement these models in the ns-2 network simulator to improve its accuracy of capturing the effect of radio interference at the receiver. The modified ns-2 simulator is used as a tool for evaluating the performances of several ad hoc network protocols. We develop a new directional antenna based MAC protocol with power control (DMACP), in which a sender maintains a minimum transmission power level for effective transmission of data packets using directional antennas. Simulation results show the throughput advantage and the savings in the average consumed power in the network using the proposed protocol. In addition, we propose a hybrid routing protocol, using a pre-emptive route discovery to replace an existing route by a shorter route when the route has been used for a given interval of time. It effectively reduces the average end-to-end delay in packet transmission as well as the routing overhead in the network. This research is also extended to wireless sensor networks. We present a new technique for location discovery. Finally, we develop a distributed signal detection and target location framework for wireless sensor networks. Target detection is accompanied by locating the detected target by analyzing the information sent by the sensors. We develop a special technique for target location estimation that uses off-line measurements and iterative computations at a centralized control unit that monitors the data transmitted from the wireless sensors. Simulation results demonstrate the accuracy of this target detection and location estimation scheme.
Category: Mobile agents (Computer software)

Quality Of Service Aware Topology Control For Wireless Ad Hoc Networks Using Smart Antennas

Author : Sk. Mohammad Rokonuzzaman
ISBN : OCLC:1011506335
Genre :
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Wireless ad hoc networks can suffer from capacity and scalability problems, especially when omni-directional antennas are used. Meeting the required Quality of Service (QoS) of the communications becomes a difficult task in such networks. To help alleviate these traditional problems of wireless ad hoc networks, this thesis presents the design and analysis of low level protocols and algorithms that intelligently use adaptive beamforming smart antennas to facilitate the provision of communications meeting QoS constraints of applications. The network model for which the protocols and algorithms in this thesis are designed is a cooperative, community wireless ad hoc network where nodes are in general fixed and there is no centrally owned infrastructure. This is an extension to the Suburban Ad-Hoc Network (SAHN). Though SAHN is a quasi-static network, much of the work of this thesis can be extended to include mobility. In this thesis medium access control, routing and topology control protocols and algorithms that are aware of QoS requirements of communications have been developed, simulated and evaluated. These protocols and algorithms take advantage of special characteristics of smart antennas. As a complete system, the new algorithms and protocols within a smart antenna equipped wireless ad hoc network, offers significant performance gains over traditional wireless networks.

Medium Access Control In Wireless Networks

Author : Hongyi Wu
ISBN : 1600219446
Genre : Technology & Engineering
File Size : 81.45 MB
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Wireless technologies and applications are becoming one of the fastest growing and most promising areas in recent years. To accommodate data transmission by multiple stations sharing the scarce wireless bandwidth, a medium access control (MAC) protocol plays a crucial role in scheduling packet transmission fairly and efficiently. The emerging wireless networks, such as ad-hoc networks, sensor networks or mesh networks, are mostly multi-hop based and in distributed manner, which brings a lot of problems and challenges in designing fine-tuned MAC protocols tailored for modern wireless network. In this book, the authors give complete and in-depth overviews to the classic medium access control algorithms and the related protocols, as well as their applications in various wireless data networks especially the most successful Wireless Local Area Networks (WLAN). The book consists of three major parts. Part I of this book, including Chapters 1-7, is emphasising on the fundamentals of medium access control algorithms and protocols. Chapter 1 provides an introduction to the wireless networks, such as overview of wireless networks, problems and challenges of the wireless networks, and the classifications of MAC protocols as well as the performance metrics. Chapter 2 introduces important collision resolution algorithms applied in medium access controls, for example, the splitting algorithm and the backoff algorithm. Chapter 3 reviews the hybrid access control algorithms that combine both contention and allocation schemes. A series of important collision avoidance schemes are introduced in Chapters 4-7 respectively, with a specific design goal covered in each chapter. Chapter 4 focuses on the multi-channel MAC protocols for collision avoidance; Chapter 5 introduces the concepts of power control and power management in medium access control and how they can be applied in MAC protocol design; Chapter 6 presents how to provide Quality-of- Service (QoS) to multimedia wireless networks, in either centralised or distributed manner; and Chapter 7 explains how the smart antennas can be applied in the medium access control to provide high channel throughput and low packet collision.
Category: Technology & Engineering

Performance Enhancements In Wireless Multihop Ad Hoc Networks

Author : Ahmad Ali Abdullah
ISBN : OCLC:858858780
Genre :
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Improving the performance of the wireless multihop ad hoc networks faces several challenges. In omni-directional antenna based solutions, the use of the RTS/CTS mechanism does not completely eliminate the hidden-terminal and exposed-terminal problems. Deafness is an additional challenge to the directional antenna based solutions. This dissertation, first develops analytical models for quantifying the throughput and delay in wireless multihop ad hoc networks. The models consider the impact of hidden terminals using the realistic signal to interference and noise ratio model and consider random node distribution. The proposed analysis is applicable to many wireless MAC protocols and applications. The analytical results reveal several important issues. The first issue is quantifying the impact of adjusting the transmission range on the throughput and delay in wireless multihop ad hoc networks. The other issue is the hidden terminal region is closely related to the distance between the transmitter and the receiver. Thus, it is possible to adjust the transmission range to optimize the whole network performance. These results provide important guidelines for network planning and protocol optimization in wireless multihop ad hoc networks. Second, it proposes a new Enhanced Busy-tone Multiple Access (EBTMA) medium access control (MAC) protocol for minimizing the negative impact of both the hidden-terminal and the exposed-terminal problems. The new protocol can also enhance the reliability of packet broadcasts and multicasts which are important for many network control functions such as routing. Different from other busy-tone assisted MAC protocols, the protocol uses a non-interfering busy-tone signal in ashort period of time, in order to notify all hidden terminals without blocking a large number of nodes for a long time. In addition, the proposed EBTMA protocol can co-exist with the existing 802.11 MAC protocol, so it can be incrementally deployed. Third, it investigates how to support the directional antennas in ad hoc multihop networks for achieving higher spatial multiplexing gain and thus higher network throughput. A new MAC protocol called Dual Sensing Directional MAC (DSDMAC) protocol for wireless ad hoc networks with directional antennas is proposed. The proposed protocol differs from the existing protocols by relying on a dual sensingstrategy to identify deafness, resolve the hidden-terminal problem and to avoid unnecessary blocking. Finally, this dissertation provides important results that help for network planning and protocol optimization in wireless multihop ad hoc networks in quantifying the impact of transmission range on the throughput and the delay. The accuracy of these results has been verified with extensive discrete event simulations.

Distributed Antenna Systems

Author : Yan Zhang
ISBN : 1420042890
Genre : Technology & Engineering
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The rapid growth in mobile communications has led to an increasing demand for wideband high data rate communications services. In recent years, the Distributed Antenna System (DAS) has emerged as a promising candidate beyond 3G and 4G mobile communications. Distributed Antenna Systems: Open Architecture for Future Wireless Communications is a comprehensive technical guide that covers the fundamental concepts, recent advances and open issues of the DAS. The topic is explored with various key challenges in diverse scenarios, including architecture, capacity, connectivity, scalability, medium access control, scheduling, dynamic channel assignment and cross-layer optimization. The primary focus of this book is the introduction of concepts, effective protocols, system integration, performance analysis techniques, simulations and experiments, and more importantly, future research directions in the DAS. The first part of the book introduces DAS fundamentals, including channel models and theoretical issues, examining the capacity of the DAS with different structures. Concentrating on the MAC and protocols for the DAS, the second part of the book includes information on distributed signal processing, optimal resource allocation, cooperative MAC protocols, cross layer design, and distributed organization. The third part presents case studies and applications of the DAS, including experiment, RF engineering, and applications.
Category: Technology & Engineering

Enhancing The Performance Of Ad Hoc Wireless Networks With Smart Antennas

Author : Somprakash Bandyopadhyay
ISBN : 9781420013238
Genre : Technology & Engineering
File Size : 23.55 MB
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A large portion of the network capacity of an ad hoc network can be wasted by the medium access mechanisms of omni-directional antennas. To overcome this problem, researchers propose the use of directional or adaptive antennas that largely reduce radio interference, improving the utilization of wireless medium and the resulting network throughput. Enhancing the Performance of Ad Hoc Wireless Networks with Smart Antennas discusses these issues and challenges. Following an introduction to ad hoc networks, it presents an overview of basic Media Access Control (MAC) and routing protocols in ad hoc networks with omni-directional antennas. The book then focuses on the use of smart antennas in ad hoc networks and reviews the strategies used in designing MAC and routing protocols for improved medium utilization and improved routing performance with effective load balancing. Finally, it analyzes the design issues related to priority based quality-of-service (QoS) routing protocols, illustrating the potential of these antennas in comparison to omni directional antennas. The book concludes with an examination of open problems and challenges for ad hoc networks.
Category: Technology & Engineering

Encyclopedia On Ad Hoc And Ubiquitous Computing

Author : Dharma P. Agrawal
ISBN : 9789812833495
Genre : Ad hoc networks (Computer networks)
File Size : 56.50 MB
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Ad hoc and ubiquitous computing technologies have received extensive attention in both the academia and industry with the explosive growth of wireless communication devices. These technologies are beneficial for many applications, such as offering futuristic high bandwidth access for users, and are expected to offer more exciting and efficient services, anytime and anywhere. In order to satisfy these diverse applications, the design issues of various wireless networks such as ad hoc, sensor, and mesh networks are extremely complicated and there are a number of technique challenges that need to be explored, involving every layer of the OSI protocol stack. This book aims to provide a complete understanding of these networks by investigating the evolution of ad hoc, sensor, and mesh networking technologies from theoretic concept to implementation protocols, from fundamentals to real applications. It provides the necessary background material needed to go deeper into the subject and explore the research literature. The explanation in the book is therefore sufficiently detailed to serve as a comprehensive reference for students, instructors, researchers, engineers, and other professionals, building their understanding of these networks. Sample Chapter(s). Chapter 1: Survey on Link Quality Models in Wireless Ad Hoc Networks (235 KB). Contents: Mobile Ad Hoc Networks: Survey on Link Quality Models in Wireless Ad Hoc Networks (M Lu & J Wu); Scalable Multicast Routing in Mobile Ad Hoc Networks (R Menchaca-Mendez & J J Garcia-Luna-Aceves); TCP, Congestion, and Admission Control Protocols in Ad Hoc Networks (A Mishra et al.); Wireless Ad Hoc Networks with Directional Antennas (B Alawieh et al.); Peer-to-Peer and Content Sharing in Vehicular Ad Hoc Networks (M Abuelela & S Olariu); Properties of the Vehicle-to-Vehicle Channel for Dedicated Short Range Communications (L Cheng et al.); Radio Resource Management in Cellular Relay Networks (K-D Lee & V C M Leung); Game Theoretic Tools Applied to Wireless Networks (H Liu et al.); Wireless Sensor Networks: Wireless Sensor Networks OCo Routing Protocols (A Jamalipour & M A Azim); Handling QoS Traffic in Wireless Sensor Networks (M Younis et al.); Mobility in Wireless Sensor Networks (A Asok et al.); Delay-Tolerant Mobile Sensor Networks (Y Wang & H Wu); Integration of RFID and Wireless Sensor Networks (H Liu et al.); Integrating Sensor Networks with the Semantic Web (Y Pei & B Wang); Effective Multiuser Broadcast Authentication in Wireless Sensor Networks (K Ren et al.); Security Attacks and Challenges in Wireless Sensor Networks (A-S K Pathan & C S Hong); Information Security in Wireless Sensor Networks (A Ouadjaout et al.); Wireless Mesh Networks: Network Architecture and Flow Control in Multi-Hop Wireless Mesh Networks (D Nandiraju et al.); Multi-Hop MAC: IEEE 802.11s Wireless Mesh Networks (R C Carrano et al.); Channel Assignment in Wireless Mesh Networks (W Fu et al.); Multi-Hop, Multi-Path and Load Balanced Routing in Wireless Mesh Networks (S Mishra & N Shenoy); Mobility Management in Wireless Mesh Networks (P Wu et al.); Selfishness and Security Schemes for Wireless Mesh Network (L Santhanam et al.). Readership: Advanced undergraduates and graduate students in computer engineering; instructors; researchers; engineers and other professionals."
Category: Ad hoc networks (Computer networks)

Wireless Mesh Networks

Author : Ekram Hossain
ISBN : 9780387688398
Genre : Technology & Engineering
File Size : 83.77 MB
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This book collects articles featuring recent advances in the theory and applications of wireless mesh networking technology. The contributed articles, from the leading experts in the field, cover both theoretical concepts and system-level implementation issues. The book starts with the essential background on the basic concepts and architectures of wireless mesh networking and then presents advanced level materials in a step-by-step fashion.
Category: Technology & Engineering

5g Wireless Directional Networking Based On Pattern Division Multiple Access

Author : Ji Qi
ISBN : OCLC:1085514127
Genre : Electronic dissertations
File Size : 68.62 MB
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With the development of mobile services, the increase of wireless trac data will lead to higher requirements for the wireless communication networks. As one of the latest promising antenna techniques, multi-beam smart antennas (MBSAs) can achieve concurrent transmissions/receptions in multiple directions/beams. Thus it can significantly improve the network throughput. In this paper, we first describe the framework of our next generation MBSA wireless network. In our network, Pattern division multiple access (PDMA)is used for multi-user communication system, while Dynamic Channel Bonding (DyB) protocol is adopted to optimize the distribution of spectrum resource. Secondly, we present a Riverbed simulator implementation with both routing and medium access control (MAC) protocols for mobile ad-hoc network wireless networks with MBSAs. We describe the simulation models with the implementation of MBSA antenna model in physical layer, MAC layer, and routing layer protocols, all in Riverbed Modeler. Then we compare two routing scenarios, i.e., multi-hop diamond routing scenario and multi-path pipe routing. At last, we will elaborate our design methodology of a testbed for the study of multimedia over cognitive radio networks (CRNs) with directional antennas. We use compressive sensing to sample the wide bandwidth and cyclostationary domain features to detect the band signals. We also propose a Markov decision based spectrum hando control scheme that can switch channels in the proper times.
Category: Electronic dissertations

Design Of Directional Mac Protocols For Wireless Networks In Riverbed Modeler

Author :
ISBN : OCLC:1013615225
Genre : Electronic books
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IEEE 802.11 medium access protocols are designed for omnidirectional antennas which transmit signals in all directions in the azimuth plane. The omnidirectional transmission has some shortfalls in the network such as - reduced signal strength at receiver, unnecessary interference, lesser power efficiency and poor spatial reuse. To mitigate these shortfalls, the directional antennas can be used in ad-hoc networks, which allow simultaneous communication between different source and destination pairs in the network which was not possible with omnidirectional antennas. n this thesis, we have studied the IEEE 802.11 based MAC protocols for nodes equipped with directional antennas (i.e., single-beam, multi-beam steering, and sector antennas) in wireless network. We have implemented the MAC protocols in Riverbed modeler. Note that the MAC protocols available in Riverbed modeler use omni-directional transmission. We analyze their performance using both the steerable and sector antenna for two network topologies and communication scenarios. Specifically we have implemented and studied the performance of DODD and multi-beam MAC schemes in a single hop and multi-hop network. The DODD MAC protocol increases the network throughput compared to the omni-directional MAC. We use the multi-beam antenna in the wireless network where each node wis equipped with four antenna beams. We exploit the concept of concurrent transmission and reception in multiple directions. The data packets are processed simultaneously to increase the throughput of the network. Average end to end delay is also reduced because of the multi-beam antenna. We have also implemented the synchronization process for MAC control packets. We note that common contention window (CW) is required to achieve beam and node synchronization. We have also implemented a new scheme to interface the compressed H.264 video trace file in Riverbed Modeler. This allows us to study the video transmission based QoS-aware protocols.
Category: Electronic books

Handbook On Advancements In Smart Antenna Technologies For Wireless Networks

Author : Sun, Chen
ISBN : 9781599049892
Genre : Education
File Size : 85.26 MB
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Provides information on smart antenna technologies featuring contributions with in-depth descriptions of terminologies, concepts, methods, and applications related to smart antennas in various wireless systems.
Category: Education

Analytical Modeling Of Medium Access Control Protocols In Wireless Networks

Author : Marcelo Menezes Carvalho
ISBN : UCAL:X73991
Genre :
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A new modeling framework is introduced for the analytical study of medium access control (MAC) protocols operating in multihop wireless ad hoc networks, i.e., wireless networks characterized by the lack of any pre-existent infrastructure and where participating devices must cooperatively provide the basic functionalities that are common to any computer network. The proposed modeling framework focuses on the interactions between the physical (PHY) and MAC layers, and on the impact that each node has on the dynamics of every other node in the network. To account for the effects of both cross-layer interactions and the interference among all nodes, a novel linear model is introduced with which topology and PHY/MAC-layer aspects are naturally incorporated in what we define as interference matrices. A key feature of the model is that nodes can be modeled individually, i.e., it allows a per-node setup of many layer-specific parameters. Moreover, no spatial probability distribution or special arrangement of nodes is assumed; the model allows the computation of individual (per-node) performance metrics for any given network topology and radio channel model.