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Author: Ali Abdalla Etorban
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Due to unpredictable network topology changes, routing in Mobile Ad Hoc Networks (MANET) is an important and challenging research area. The routing protocol should detect and maintain a good route(s) between source and destination nodes in these dynamic networks. Many routing protocols have been proposed for mobile ad hoc networks, and none can be considered as the best under all conditions. This thesis presents the design and implementation of a new proactive multipath MANET routing protocol. The protocol, named Multipath Destination Sequenced Distance Vector (MDSDV), is based on the well known single path Destination Sequenced Distance Vector (DSDV). We show that the protocol finds node-disjoint paths, i.e., paths which do not have any nodes in common, except for the source and the destination. The thesis presents a systematic evaluation of MDSDV in comparison with three well known protocols: one proactive (DSDV), and two reactive (AODV) and (DSR). MDSDV behaves very well in terms of its packet delivery fraction and data dropped in both static and dynamic networks. It delivers nearly 100% of data in dense networks (networks with more than 20 nodes). The speed of the nodes and the number of sources have a low impact on its performance.
Author: Ali Abdalla Etorban
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Due to unpredictable network topology changes, routing in Mobile Ad Hoc Networks (MANET) is an important and challenging research area. The routing protocol should detect and maintain a good route(s) between source and destination nodes in these dynamic networks. Many routing protocols have been proposed for mobile ad hoc networks, and none can be considered as the best under all conditions. This thesis presents the design and implementation of a new proactive multipath MANET routing protocol. The protocol, named Multipath Destination Sequenced Distance Vector (MDSDV), is based on the well known single path Destination Sequenced Distance Vector (DSDV). We show that the protocol finds node-disjoint paths, i.e., paths which do not have any nodes in common, except for the source and the destination. The thesis presents a systematic evaluation of MDSDV in comparison with three well known protocols: one proactive (DSDV), and two reactive (AODV) and (DSR). MDSDV behaves very well in terms of its packet delivery fraction and data dropped in both static and dynamic networks. It delivers nearly 100% of data in dense networks (networks with more than 20 nodes). The speed of the nodes and the number of sources have a low impact on its performance.
Author: Piyush Khengar
Publisher:
ISBN:
Category : Wireless communication systems
Languages : en
Pages : 344
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A mobile ad hoc network is a collection of autonomous nodes connected to each other in a peer-to-peer fashion on a wireless medium. Such networks are used in emerging applications which require co-operative mobile data exchange in areas where there is little or no infrastructure available or where providing such infrastructure is not cost effective. Efficient dynamic routing is a major research challenge in such a network. Multipath routing provides a strong potential for efficient routing by maintaining multiple routes. This provides some form of fault-tolerance, as alternate paths can be used when one breaks. Also, data packets can be forwarded via multiple paths concurrently thus exploiting a larger network capacity. However, CSMA (carrier-sense multiple access) being a dominant form of channel access protocol in mobile ad hoc network, multipath forwarding is often unable to exploit its full potential. This is because multiple paths may form in each others2 radio neighborhood limiting spatial diversity. Data transmission in one path causes sufficient interference in another such that only one path can be used at a time. This phenomenon has been known as 3route coupling.4 We investigate the use of multichannel CSMA-based medium access protocols to reduce the impact of such route coupling. We use two such multichannel protocols to demonstrate that a significant throughput improvement is possible at high offered loads relative to the single channel CSMA for multipath data forwarding scenarios. One of the protocols chooses the channel based on interference power measurement at the sender. The other chooses a unique channel for each path. Our study shows that the multichannel protocols are able to limit the impact of interference between neighboring transmissions effectively.
Author: Jagrut Solanki
Publisher: GRIN Verlag
ISBN: 3656904944
Category : Technology & Engineering
Languages : en
Pages : 11
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Scientific Essay from the year 2015 in the subject Engineering - Communication Technology, , language: English, abstract: Mobile communication has enjoyed an incredible rise in quality throughout the last decade. Network dependability is most important concern in wireless Ad-hoc network. a serious challenge that lies in MANET (Mobile Ad-hoc network) is that the unlimited mobility and lots of frequent failure because of link breakage. Standard routing algorithms are insufficient for Ad-hoc networks. as a results of major drawback in MANET is limited power provide, dynamic networking. In MANET each node works as a router and autonomously performs mobile practicality. The link connectivity changes ceaselessly because of mobility to reflect this routing information additionally needs to get changed ceaselessly. AODV protocol is projected for this extraordinarily mobile network. In ancient AODV if any node fails in middle of transmission the method starts from the source node but in our propose scheme the transmission starts from the closest neighbor node therefore shows very important reduction in delay and improvement in packet delivery ratio are achieved. It also reduces the routing overhead by reducing the frequency of route discovery process.
Author: Ravinder Singh Mann
Publisher:
ISBN: 9783659929670
Category :
Languages : en
Pages : 196
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Author: Periyasamy Pitchaipillai
Publisher: Cambridge Scholars Publishing
ISBN: 1527514749
Category : Computers
Languages : en
Pages : 162
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The Ad-hoc On-demand Multipath Distance Vector (AOMDV) routing protocol is widely used in highly dynamic ad-hoc networks because of its generic features. The transmission of reliable energy efficient data is an emerging issue in AOMDV routing as the nodes are prone to link failures and route breaks in highly dynamic ad-hoc networks. In order to eliminate such problems, a novel node disjoint multipath routing protocol called Link Reliable Energy Efficient AOMDV (LR-EE-AOMDV), the extension of a well-known AOMDV, is proposed here to find multiple link reliable energy efficient paths between any source and destination pair for data transmission using metrics such as Path Length, Path-Link Quality Estimator (P-LQE) and a novel Path-Node Energy Estimator (P-NEE).
Author:
Publisher:
ISBN:
Category : Mobile computing
Languages : en
Pages : 302
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Author:
Publisher:
ISBN:
Category : Mobile communication systems
Languages : en
Pages :
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A mobile ad-hoc network (MANET) is a collection of wireless mobile nodes forming a temporary network without the support of any established infrastructure or centralized administration. There are many potential applications based the techniques of MANETs, such as disaster rescue, personal area networking, wireless conference, military applications, etc. MANETs face a number of challenges for designing a scalable routing protocol due to their natural characteristics. Guaranteeing delivery and the capability to handle dynamic connectivity are the most important issues for routing protocols in MANETs. In this dissertation, we will propose four algorithms that address different aspects of routing problems in MANETs. Firstly, in position based routing protocols to design a scalable location management scheme is inherently difficult. Enhanced Scalable Location management Service (EnSLS) is proposed to improve the scalability of existing location management services, and a mathematical model is proposed to compare the performance of the classical location service, GLS, and our protocol, EnSLS. The analytical model shows that EnSLS has better scalability compared with that of GLS. Secondly, virtual backbone routing can reduce communication overhead and speedup the routing process compared with many existing on-demand routing protocols for routing detection. In many studies, Minimum Connected Dominating Set (MCDS) is used to approximate virtual backbones in a unit-disk graph. However finding a MCDS is an NP-hard problem. In the dissertation, we develop two new pure localized protocols for calculating the CDS. One emphasizes forming a small size initial near-optimal CDS via marking process, and the other uses an iterative synchronized method to avoid illegal simultaneously removal of dominating nodes. Our new protocols largely reduce the number of nodes in CDS compared with existing methods. We show the efficiency of our approach through both theoretical analysis and simulation experiments. Finally, using multiple redundant paths for routing is a promising solution. However, selecting an optimal path set is an NP hard problem. We propose the Genetic Fuzzy Multi-path Routing Protocol (GFMRP), which is a multi-path routing protocol based on fuzzy set theory and evolutionary computing.
Author: Dr J Viji Gripsy
Publisher:
ISBN: 9789386176028
Category : Computers
Languages : en
Pages : 0
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Author: 陳仁暉
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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