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Author: Ankur Gupta Publisher: ISBN: Category : Languages : en Pages : 62
Book Description
The past decade has witnessed a remarkable interest in wireless ad hoc networks that operate without any infrastructure support. The potential for deployment of such networks exists in many scenarios ranging from civil and construction engineering, disaster relief to sensor networks and military applications. The IEEE 802.11 Distributed Coordination Function (DCF) is the dominant MAC (layer) protocol for wireless ad hoc networks. Though the DCF scheme has survived the test of time, it still has its characteristic flaws namely the hidden and exposed terminal problems. Various protocols have been suggested to address these problems thereby leading to an overall increase in network throughput. Some of the popular protocols involve adjusting the carrier sensing threshold, replacing the omni directional antennas with directional antennas and intelligent calibration of transmission power. Studies have shown that directional antennas offer numerous advantages over omni directional antennas and thus has the potential to enhance the performance of ad hoc networks. For one, directional antennas have the ability to streamline their power in the direction of the receiver thereby offering longer transmission and reception ranges for the same amount of power. MAC layer protocols specifically designed to support such directional transmission and reception has been a current active area of research. Most of these protocols consider directional transmission under the assumption that the communication range of omni and directional antennas are the same. Apparently this assumption is not supported in any realistic situation. Moreover, the scientific community has not researched in depth the effect of topology on power consumption in ad hoc networks. In this thesis, we propose a cross-layer power optimization scheme for wireless ad hoc networks. The novelty of our work lies in the fact that we exploit the knowledge of the network topology to dynamically calibrate transmission power. The information about the network topology is retrieved from the Network Layer. Specifically, we consider three different network topologies -- (i) a sparse topology, (ii) a dense topology and a (iii) clusterbased topology. The MAC layer implements a dynamic power control scheme which regulates the transmission power of a transmitting node based on the node density at the receiver's end. In addition a transmitting node can adjust its own transmission power to the optimal level if the SINR value at the receiving node is known. Our cross-layer power control algorithm takes the above fact into account. Extensive simulation in NS2 shows that in all the three topologies our cross layer power control scheme (use of directional antennas with power control) leads to prolonged network lifetime and significantly increases the system throughput.
Author: Ankur Gupta Publisher: ISBN: Category : Languages : en Pages : 62
Book Description
The past decade has witnessed a remarkable interest in wireless ad hoc networks that operate without any infrastructure support. The potential for deployment of such networks exists in many scenarios ranging from civil and construction engineering, disaster relief to sensor networks and military applications. The IEEE 802.11 Distributed Coordination Function (DCF) is the dominant MAC (layer) protocol for wireless ad hoc networks. Though the DCF scheme has survived the test of time, it still has its characteristic flaws namely the hidden and exposed terminal problems. Various protocols have been suggested to address these problems thereby leading to an overall increase in network throughput. Some of the popular protocols involve adjusting the carrier sensing threshold, replacing the omni directional antennas with directional antennas and intelligent calibration of transmission power. Studies have shown that directional antennas offer numerous advantages over omni directional antennas and thus has the potential to enhance the performance of ad hoc networks. For one, directional antennas have the ability to streamline their power in the direction of the receiver thereby offering longer transmission and reception ranges for the same amount of power. MAC layer protocols specifically designed to support such directional transmission and reception has been a current active area of research. Most of these protocols consider directional transmission under the assumption that the communication range of omni and directional antennas are the same. Apparently this assumption is not supported in any realistic situation. Moreover, the scientific community has not researched in depth the effect of topology on power consumption in ad hoc networks. In this thesis, we propose a cross-layer power optimization scheme for wireless ad hoc networks. The novelty of our work lies in the fact that we exploit the knowledge of the network topology to dynamically calibrate transmission power. The information about the network topology is retrieved from the Network Layer. Specifically, we consider three different network topologies -- (i) a sparse topology, (ii) a dense topology and a (iii) clusterbased topology. The MAC layer implements a dynamic power control scheme which regulates the transmission power of a transmitting node based on the node density at the receiver's end. In addition a transmitting node can adjust its own transmission power to the optimal level if the SINR value at the receiving node is known. Our cross-layer power control algorithm takes the above fact into account. Extensive simulation in NS2 shows that in all the three topologies our cross layer power control scheme (use of directional antennas with power control) leads to prolonged network lifetime and significantly increases the system throughput.
Author: John D. Matyjas Publisher: CRC Press ISBN: 1498707548 Category : Computers Languages : en Pages : 512
Book Description
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
Author: Somprakash Bandyopadhyay Publisher: CRC Press ISBN: 1420013238 Category : Computers Languages : en Pages : 210
Book Description
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.
Author: Dharma P. Agrawal Publisher: World Scientific ISBN: 9812833498 Category : Computers Languages : en Pages : 689
Book Description
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."
Author: Prasant Mohapatra Publisher: Springer Science & Business Media ISBN: 0387226907 Category : Technology & Engineering Languages : en Pages : 287
Book Description
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.
Author: Violet R. Syrotiuk Publisher: Springer Science & Business Media ISBN: 3540291326 Category : Computers Languages : en Pages : 370
Book Description
This book constitutes the refereed proceedings of the 4th International Conference on Ad-Hoc Networks and Wireless, ADHOC-NOW 2005, held in Cancun, Mexico in October 2005. The 27 revised full papers presented together with the abstracts of 2 invited talks were carefully reviewed and selected from over 100 submissions. The papers discuss architectures, protocols, and algorithms for: access control, scheduling, ad hoc and sensor networks analytic methods and modelling for performance evaluation, characterization, optimization, auto-configuration, incentives and pricing, location awareness, discovery, dependence, and management, mesh networks, new applications, power management, power control, and energy-efficiency, quality-of-service, resource allocation, multimedia, routing (unicast, multicast, etc.), security and privacy, service discovery, systems and testbeds, wireless internet, and data management.
Author: Carlos Quiroz Perez Publisher: ISBN: Category : Languages : en Pages :
Book Description
Most mobile nodes are operated using batteries, protocols which conserve energy are of interest. The Dynamic Directional Power Control Protocol (DDPC) is a protocol that dynamically varies the energy used in directional transmission to increase the battery life of the transmitter without sacrificing connectivity with the receiver. The advantage of DDPC is that it takes into account the remaining battery power of a node before changing its transmission power. DDPC can achieve a higher network lifetime when compared to a network where nodes use a fixed transmit power level. Meanwhile DDPC dynamically reduces the energy consumed by a node in transmission. It can also reach nodes far from the transmitter by using directional antennas.
Author: Muhammad Zeeshan Shakir Publisher: Springer ISBN: 3319275682 Category : Technology & Engineering Languages : en Pages : 446
Book Description
This book investigates energy management approaches for energy efficient or energy-centric system design and architecture and presents end-to-end energy management in the recent heterogeneous-type wireless network medium. It also considers energy management in wireless sensor and mesh networks by exploiting energy efficient transmission techniques and protocols. and explores energy management in emerging applications, services and engineering to be facilitated with 5G networks such as WBANs, VANETS and Cognitive networks. A special focus of the book is on the examination of the energy management practices in emerging wireless cellular and ad hoc networks. Considering the broad scope of energy management in wireless cellular and ad hoc networks, this book is organized into six sections covering range of Energy efficient systems and architectures; Energy efficient transmission and techniques; Energy efficient applications and services.
Author: Jie Wu Publisher: CRC Press ISBN: 0203323688 Category : Computers Languages : en Pages : 896
Book Description
The availability of cheaper, faster, and more reliable electronic components has stimulated important advances in computing and communication technologies. Theoretical and algorithmic approaches that address key issues in sensor networks, ad hoc wireless networks, and peer-to-peer networks play a central role in the development of emerging network
Author: Ankur Gupta
Author: Ankur Gupta
Author: John D. Matyjas
Author: Somprakash Bandyopadhyay
Author: Dharma P. Agrawal
Author: Prasant Mohapatra
Author: Qilei Bian
Author: Violet R. Syrotiuk
Author: Carlos Quiroz Perez
Author: Muhammad Zeeshan Shakir
Author: Jie Wu