Mobile Ad-Hoc Networks

Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of-the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: quality-of-service and video communication, routing protocol and cross-layer design. A few interesting problems about security and delay-tolerant networks are also discussed. This book is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks

Decisive analysis of current state of the art in congestion aware and control routing models in ad hoc networks

An important aspect that portrays a crucial position in the ad hoc network routing is congestion. Almost every research analysis is en-route in adapting this key factor in addressing congestion. This problem cannot be totally addressed by the regular TCP protocol based networks, keeping in view the special assets which include multi hop sharing etc, which is difficult to ascertain in ad hoc networks. Many attempts have been made and are in progress by researchers to provide unique solutions to the above mentioned problems. This paper projects a vital study on jamming aware and different routing standards that have been dealt with in recent times

Recent Advances in Wireless Communications and Networks

This book focuses on the current hottest issues from the lowest layers to the upper layers of wireless communication networks and provides "real-time" research progress on these issues. The authors have made every effort to systematically organize the information on these topics to make it easily accessible to readers of any level. This book also maintains the balance between current research results and their theoretical support. In this book, a variety of novel techniques in wireless communications and networks are investigated. The authors attempt to present these topics in detail. Insightful and reader-friendly descriptions are presented to nourish readers of any level, from practicing and knowledgeable communication engineers to beginning or professional researchers. All interested readers can easily find noteworthy materials in much greater detail than in previous publications and in the references cited in these chapters

Assessment of 3GPP macro sensor network in disaster scenarios

The effective and efficient use of communication technologies during the disaster sce-narios is vital for the relief and rescue works as well as for the disaster affected people. During the disaster scenarios, links between the Radio Access Network (RAN) and the Core Network (CN) might be broken in the disaster affected areas. If the link between such affected eNodeBs can be established, the data from the user can be transported to the network via node-to-node communication. Thus, this utilization of cellular mobile networks for the communication during such scenarios can be a key technological achievement. The goal of this thesis is to study the possible realization of the BS of the mobile network as a sensor node during the disaster scenarios for the detection of such scenari-os and to study the possible implementation of the node-to-node communication be-tween the BSs for the reliable delivery of the user data to the network. This thesis exam-ines the possibility of this inter-node communication for 3rd Generation Partnership Pro-ject (3GPP) Long Term Evolution (LTE). The merits of the LTE technology and its specifications have been deeply studied. The calculation in the analysis part shows that node-to-node communication is pos-sible in LTE. A probable frequency reuse plan for the node-to-node communication, which is proposed in this thesis, is a result of the bandwidth scalability property of LTE. The result from the theoretical analysis shows that Signal to Interference plus Noise Ra-tio (SINR) of 5.92 dB can be achieved during such communication. This SINR value can support Quadrature Phase Shift Keying (QPSK) modulation technique with 3/4 or 4/5 code rate for the bandwidth of 2.5 MHz. The Multiple-Input Multiple-Output (MIMO) technology in the LTE specification helps to provide additional increase in the data rates. The simplest communication mode can provide the data rates of 1.86 Mbps whereas 4 x 4 MIMO can provide up to 7.5 Mbps. Further, the proposed framework can be considered as the base for the implementation of node-to-node communication. This master thesis work has considered LTE as a communication technology for the study of a probable communication technology during the disaster scenarios. The flexi-bility in the utilization of the bandwidth in LTE provides the possibility for the node-to-node communication. The utilization of frequency band in Global System for Mobile Communication (GSM) also provides the possibility for the node-to-node communica-tion as well. However in Universal Mobile Telecommunication System (UMTS), the frequency band is the limitation for implementing the node-to-node communication. In UMTS, the interference will be very high because of the 5 MHz fixed frequency band implementation

An Energy-conscious Transport Protocol for Multi-hop Wireless Networks

We present a transport protocol whose goal is to reduce power consumption without compromising delivery requirements of applications. To meet its goal of energy efficiency, our transport protocol (1) contains mechanisms to balance end-to-end vs. local retransmissions; (2) minimizes acknowledgment traffic using receiver regulated rate-based flow control combined with selected acknowledgements and in-network caching of packets; and (3) aggressively seeks to avoid any congestion-based packet loss. Within a recently developed ultra low-power multi-hop wireless network system, extensive simulations and experimental results demonstrate that our transport protocol meets its goal of preserving the energy efficiency of the underlying network.Defense Advanced Research Projects Agency (NBCHC050053

System level modelling and design of hypergraph based wireless system area networks for multi-computer systems

This thesis deals with issues pertaining the wireless multicomputer interconnection networks namely topology and Medium Access Control (MAC). It argues that new channel assignment technique based on regular low-dimensional hypergraph networks, the dual radio wireless hypermesh, represents a promising alternative high-performance wireless interconnection network for the future multicomputers to shared communication medium networks and/or ordinary wireless mesh networks, which have been widely used in current wireless networks. The focus of this work is on improving the network throughput while maintaining a relatively low latency of a wireless network system. By means of a Carrier Sense Multiple Access (CSMA) based design of the MAC protocol and based on the desirable features of hypermesh network topology a relatively high performance network has been introduced. Compared to the CSMA shared communication channel model, which is currently the de facto MAC protocol for most of wireless networks, our design is shown to achieve a significant increase in network throughput with less average network latency for large number of communication nodes. SystemC model of the proposed wireless hypermesh, validated through mathematical models, are then introduced. The analysis has been incorporated in the proper SystemC design methodology which facilitates the integration of communication modelling into the design modelling at the early stages of the system development. Another important application of SystemC modelling techniques is to perform meaningful comparative studies of different protocols, or new implementations to determine which communication scenario performs better and the ability to modify models to test system sensitivity and tune performance. Effects of different design parameters (e.g., packet sizes, number of nodes) has been carried out throughout this work. The results shows that the proposed structure has out perform the existing shared medium network structure and it can support relatively high number of wireless connected computers than conventional networks