Cross Layer Design for Hierarchical Routing Protocol for Wireless Ad Hoc Network PDF Download
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Author: Mohammad Tarique
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Mohammad Tarique
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Anita Yadav
Publisher: GRIN Verlag
ISBN: 3346132161
Category : Computers
Languages : en
Pages : 142
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Book Description
Doctoral Thesis / Dissertation from the year 2016 in the subject Computer Science - Miscellaneous, grade: 16, , language: English, abstract: In this thesis, we have modified AODV routing protocol by incorporating link prediction algorithm using a proposed link prediction model. This algorithm predicts the link availability time and even before the link breaks; either it repairs the route locally or sends information to the source nodes to enable them to initiate a new route search well in time. This algorithm improves the quality of service of the network. Simulation results show that AODV routing algorithm with link availability model performs better than the existing AODV. Advances in wireless technology and hand-held computing devices have brought revolution in the area of mobile communication. The increasing mobility of humans across the globe generated demand for infrastructure-less and quickly deployable mobile networks. Such networks are referred to as Mobile Adhoc Networks (MANET). Usually, nodes in a MANET also act as a router while being is free to roam while communicating each others. Adhoc networks are suited for use in situations where infrastructure is unavailable or to deploy one is not cost-effective. Frequent changes in network topology due to mobility and limited battery power of the mobile devices are the key challenges in the adhoc networks. The depletion of power source may cause early unavailability of nodes and thus links in the network. The mobility of nodes will also causes frequent routes breaks and adversely affects the required performance for the applications. Availability of a route in future mainly depends on the availability of links between the nodes forming the route. Therefore, it is important to predict the future availability of a link that is currently available. We have proposed an analytical model for link prediction using Newton divided difference method. This link availability algorithm is incorporated in AODV routing algorithm (AODVLP) to evaluate the performance of AODV routing protocol using the metrics viz. delivery rate, average end-to-end delay, average RTS collisions per node and route failure. In the existing AODV protocol, packets are routed until a link in the existing path fails. This results in degradation of quality of service of network in terms of end-to-end delay and delivery ratio.
Author: Mohamed Ibnkahla
Publisher: CRC Press
ISBN: 1420046101
Category : Technology & Engineering
Languages : en
Pages : 526
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Book Description
Adaptive techniques play a key role in modern wireless communication systems. The concept of adaptation is emphasized in the Adaptation in Wireless Communications Series through a unified framework across all layers of the wireless protocol stack ranging from the physical layer to the application layer, and from cellular systems to next-generation wireless networks. Adaptation and Cross Layer Design in Wireless Networks is devoted to adaptation in the data link layer, network layer, and application layer. The book presents state-of-the-art adaptation techniques and methodologies, including cross-layer adaptation, joint signal processing, coding and networking, selfishness in mobile ad hoc networks, cooperative and opportunistic protocols, adaptation techniques for multimedia support, self –organizing routing, and tunable security services. It presents several new theoretical paradigms and analytical findings which are supported with various simulation and experimental results. Adaptation in wireless communications is needed in order to achieve high capacity and ubiquitous communications. The current trend in wireless communication systems is to make adaptation dependent upon the state of the relevant parameters in all layers of the system. Focusing on simplified cross layer design approaches, this volume describes advanced techniques such as adaptive resource management, adaptive modulation and coding, 4G communications, QoS, diversity combining, and energy and mobility aware MAC protocols. The first volume in the series, Adaptive Signal Processing in Wireless Communications (cat no.46012) covers adaptive signal processing at the physical layer.
Author:
Publisher:
ISBN:
Category : Wireless LANs
Languages : en
Pages : 161
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Book Description
With the evolution of 802.11-based wireless networks from hotspots to mesh networks, there has been a tremendous increase in the number of wireless users and density of deployments. Consequently, current wireless network face several problems due to interference, uncoordinated medium access, packet processing overheads at each hop and sub-optimal route selection. While radio technologies continue to improve speeds upto hundred megabits per second, the inadequacies of medium access and routing protocols severely impact the overall network capacity and end-user experience. In this thesis, we focus on improving the scalability and packet forwarding efficiency of multihop wireless networks. We introduce a self-organizing hierarchical ad-hoc network design (SOHAN) based on a three-tier hierarchy with dedicated forwarding nodes to address the scalability of existing multihop networks. We focus on realistic system design considerations and develop a Linux-based system prototype including novel protocols for bootstrapping, discovery and topology control to enable hierarchical self-organization. Experimental and simulation-based evaluations indicate a 2.5 times performance improvement over flat network models. We address packet forwarding inefficiencies of existing techniques over multihop networks due to queuing, contention and reprocessing at each hop and propose an interface contained forwarding architecture (ICF) using a combination of cut-through MAC protocol and label-based forwarding to enable "atomic" channel access for downstream transmissions and reduce self-interference. Next, we design a cross layer enabled cut through architecture (CLEAR) that extends the ICF mechanism with novel airtime metric-based route selection to mitigate the interference between flows. We further outline a time-based coordination scheme using soft reservations during route discovery phase to coordinate multihop "burst" transfers amongst flows. This model can be adapted to support differentiated services and provide a"low-latency socket" for real-time traffic over multiple hops. Our work can be the basis for a switched multihop wireless network design that enables conflict-free transfers resulting in efficient utilization of channel capacity and providing a viable alternative to wired network deployments. A substantial contribution of this thesis also includes the design and development of the ORBIT wireless testbed with focus on cross-layer experimental framework to facilitate rapid prototyping of wireless protocols and experimental evaluations at scale.
Author: Rashvand, Habib F.
Publisher: IGI Global
ISBN: 1466609613
Category : Computers
Languages : en
Pages : 656
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Book Description
Although the existing layering infrastructure--used globally for designing computers, data networks, and intelligent distributed systems and which connects various local and global communication services--is conceptually correct and pedagogically elegant, it is now well over 30 years old has started create a serious bottleneck. Using Cross-Layer Techniques for Communication Systems: Techniques and Applications explores how cross-layer methods provide ways to escape from the current communications model and overcome the challenges imposed by restrictive boundaries between layers. Written exclusively by well-established researchers, experts, and professional engineers, the book will present basic concepts, address different approaches for solving the cross-layer problem, investigate recent developments in cross-layer problems and solutions, and present the latest applications of the cross-layer in a variety of systems and networks.
Author: Yu Wang
Publisher:
ISBN:
Category : Computer algorithms
Languages : en
Pages : 386
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Author: Hui Xu
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
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Author: Christina Comaniciu
Publisher: Springer Science & Business Media
ISBN: 0387277501
Category : Technology & Engineering
Languages : en
Pages : 214
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Book Description
Cross-layer design seeks to enhance the capacity of wireless networks significantly through the joint optimization of multiple layers in the network, primarily the physical (PHY) and medium access control (MAC) layers. Although there are advantages of such design in wireline networks as well, this approach is particularly advantageous for wireless networks due to the properties (such as mobility and interference) that strongly affect performance and design of higher layer protocols. This unique monograph is concerned with the issue of cross-layer design in wireless networks, and more particularly with the impact of node-level multiuser detection on such design. It provides an introduction to this vibrant and active research area insufficiently covered in existing literature, presenting some of the principal methods developed and results obtained to date. Accompanied by numerous illustrations, the text is an excellent reference for engineers, researchers and students working in communication networks.
Author: Wei Liu
Publisher:
ISBN:
Category : Computer networks
Languages : en
Pages :
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Book Description
The basic idea of Courtesy Piggybacking is to let high priority traffic help the low priority traffic by sharing the unused residual bandwidth. As a result, the scheme improves the overall performance for different prioritized services. Finally, we propose an energy efficient, reliable and scalable data dissemination scheme for wireless sensor networks. Based on supply chain management methodology, for each sensing task, the sensor field is conceptually partitioned into several functional areas, and then different routing schemes are applied in different areas. This scheme addresses energy-efficiency, reliability, and scalability at the same time.
Author: Feng Chen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT: This dissertation focuses on cross layer design for network protocols in wireless ad hoc networks. It studies the relationship between link scheduling at medium access control layer and physical or network layer. Link scheduling is a way of achieving the optimal MAC layer throughput while avoiding collisions. In this dissertation, it is modeled using graph theory concepts based on different interference model. MAC layer is served as an anchoring layer in our cross layer design which can collect physical layer information and provide information to network layer. Cross layer design between MAC layer and physical layer or routing layer can provide better overall system performance. The dissertation will discuss how the carrier sensing threshold, a physical layer parameter, impact the link scheduling strategy in order to achieve the optimal aggregate throughput at MAC layer. The dissertation will also investigate the joint routing and link scheduling problem using a graph theory based model. Further more, since solving the above joint design problems is usually NP-hard, we propose polynomial solutions for estimating the bounds for network capacity. In an effort to design MAC layer solution for real systems, we propose an opportunistic MAC for multichannel multiradio wireless networks which utilizes multiradio diversity at physical layer as well.
