Implementation and Evaluation of Multichannel Multi-Interface Routing Mechanism with QoS-Consideration for Ad-Hoc Networ
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Research Article Implementation and Evaluation of Multichannel Multi-Interface Routing Mechanism with QoS-Consideration for Ad-Hoc Networks Shinsuke Kajioka,1 Naoki Wakamiya,1 Hiroki Satoh,2 Kazuya Monden,2 Masato Hayashi,3 Susumu Matsui,2 and Masayuki Murata1 1 Graduate
School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka 565-0871, Japan Development Laboratory, Hitachi, Ltd., 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa 244-0817, Japan 3 Automotive Business Group, Renesas Electronics Europe GmbH, Gothaer Straße 18, 40880 Ratingen, Germany 2 System
Correspondence should be addressed to Shinsuke Kajioka, [email protected] Received 9 June 2009; Revised 31 October 2009; Accepted 21 January 2010 Academic Editor: Guillaume Chelius Copyright © 2010 Shinsuke Kajioka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. To accommodate real-time multimedia application while satisfying application-level QoS requirements in a wireless ad-hoc network, we need QoS control mechanisms. We proposed a new routing mechanism for a wireless ad-hoc network composed of nodes equipped with multiple network interfaces. 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-level QoS requirements. In this paper, we evaluated feasibility of the proposal through simulation and practical experiments and confirmed that our proposal effectively transferred multimedia packets over a logical path avoiding congested links. The load on a network is well distributed and the network can accommodate more sessions than OLSRv2 and QOLSR.
1. Introduction Wireless ad-hoc networks need no fixed communication infrastructures such as routers, switches, access points, and cables. Nodes communicate with each other through radio signals to organize a network and transmit data from one node to another. Packets are transmitted over a wireless adhoc network including both of best-effort traffic (file transfer, e-mail, and Web) and real-time traffic (remote monitoring, video conferencing, and VoIP). It has been recognized that the effective network capacity of a single-channel and multihop wireless network using the normal IEEE 802.11 standard MAC is not n × (per channel throughput), but √ O(n/ n) × (per channel throughput) [1], where n is the number of nodes using the same channel in the network. In [2], they further took into account phenomena, such as medium contention, channel fading, and radio interference, causing the degradation of the effective bandwidth. Since
the capacity of a wireless link is limited and the effective bandwidth is much smaller because of contention among the nodes [1, 2], it is not trivial
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