QoS enabled routing in mobile ad hoc networks
ABSTRACT The aim of this work is to present a QoS enabled routing protocol in ad hoc networks and compare it with a normal routing protocol. Results demonstrate how a QoS enable routing mechanism makes the resource consumption more efficient by minimising the unnecessary signalling and stopping the sessions that cannot meet the demanded QoS requirement. The performance of both routing and QoS routing protocols are evaluated in the presence of information achieved from the link layer. The QoS enabled routing protocol shows a significant improvement in the protocol performance metrics applied in our measurements, such as packet delay and protocol overhead. The results achieved from this experiment lead us to analyse our proposed mechanism to add link layer information in control routing messages. Measuring wireless resources, such as bandwidth, with the help of periodic signalling packets makes both the routing and the QoS routing protocols react slower to wireless link changes. This problem can be overcome by more frequent advertisements.
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Conference Proceeding: Capacity, bandwidth and available bandwidth concepts for wireless ad hoc networks[show abstract] [hide abstract]
ABSTRACT: In a wired multi-hop path, the concepts of end-to-end bandwidth (BW) and end-to-end available bandwidth (ABW) are clearly defined and widely accepted as the capacity of the narrow link and the unused bandwidth of the tight link, respectively. This consensus has led to clever estimation techniques based on active probing measurements. However, these concepts do not apply directly to wireless ad hoc networks (manets) because the idea of a point-to-point link does not exist as an independent communication resource between a pair of neighbor nodes given the shared nature of the transmission medium and the random nature of multiple access protocols. Furthermore, the overhead is no longer a constant small header appended to each packet, but a random variable that depends on many phenomena and makes both BW and ABW largely dependent on packet length. In this paper we provide new definitions for BW and ABW of a multi-hop path in a manet, which extend the wired concepts and capture their random shared nature and their packet length dependency. Indeed, within the new definitions, we replace the concept of a point-to-point link with the concept of a spatial channel as the independent unit of communication resource, so that the new definitions become natural extensions of the widely accepted ones. Simulations validate the analytical model and the accuracy of these new concepts and definitions.Military Communications Conference, 2008. MILCOM 2008. IEEE; 12/2008
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ABSTRACT: A Mobile Ad-Hoc Network (MANET) is a collection of wireless mobile nodes that communicate with each other without any centralized access points, infrastructure, or centralized administration. This paper presents an analysis of various quality of service metrics (QoS) of mobile ad hoc network nodes like Throughput , Delay , Packet Delivery Ratio (PDR), Hop Count (HC) and Control Overhead (CO) in varying terrain dimensions. The goal of this paper is to provide an insight on how node density affects quality of service metrics in mobile ad-hoc networks. A comparative study of the terrain dimensions is made to determine the dimension in which the mobile nodes produce optimum quality of service metrics. The analysis is performed in the simulation environment and graphical results are explained.REVIEW PAPER International Journal of Recent Trends in Engineering. 12/2009; 2.
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ABSTRACT: To accommodate real-time multimedia application while satisfying application QoS requirements in a wireless ad-hoc network, we need QoS control mechanisms. In this paper, we propose a new routing mechanism to support real-time multimedia communication by efficiently utilize the limited wireless network capacity. Our mechanism considers a wireless ad-hoc network composed of nodes equipped with multiple network interfaces to each of which a different wireless channel can be assigned. By embedding information about channel usage in control messages of OLSRv2, each node obtains a view of topology and bandwidth information of the whole network. Based on the obtained information, a source node determines a logical path with the maximum available bandwidth to satisfy application QoS requirements. Through simulation experiments, we confirmed that our proposal effectively routed multimedia packets over a logical path avoiding congested links. As a result, the load on a network is well distributed and the network can accommodate more sessions than QOLSR. We also conducted practical experiments using wireless ad-hoc relay nodes with four network interfaces and verified the practicality of our proposal.Ad Hoc Networks. 01/2011; 9:911-927.