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Journal of Computer Networks and Communications
Volume 2011 (2011), Article ID 951310, 13 pages
http://dx.doi.org/10.1155/2011/951310
Research Article

A DiffServ Architecture for QoS-Aware Routing for Delay-Sensitive and Best-Effort Services in IEEE 802.16 Mesh Networks

1School of Mobile Computing and Communications, Jadavpur University, Kolkata 700032, India
2Department of Computer Science and Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
3Department of Information Technology, Jadavpur University, Kolkata 700032, India
4School of Education Technology, Jadavpur University, Kolkata 700032, India

Received 11 April 2011; Accepted 11 August 2011

Academic Editor: Youyun Xu

Copyright © 2011 Ishita Bhakta 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.

Abstract

In today's networks, the widespread use of real-time traffic such as video and audio applications demand special service guarantee in terms of throughput, delay, and jitter, thus making quality of service (QoS) a key problem. IEEE 802.16 mesh networks are likely to be the basis of next-generation last mile network connectivity. So, providing QoS is one of the major designing goals in IEEE 802.16 mesh network. While the standard defines five service classes for PMP mode, no standard defined service classes exist for mesh mode. In this paper, we describe a differentiated service (DiffServ) architecture for QoS support in IEEE 802.16 mesh network by considering a basic requirement for QoS guarantee—delay. A new cross-layer routing metric is proposed, namely, expected scheduler delay (ESD). An efficient distributed scheme is proposed to calculate ESD and route the packets using source routing mechanism. This scheme is capable of differentiating between delay sensitive and best-effort traffic and route packets accordingly. Finally, the results of the proposed scheme are compared with the standard schemes that take hop count as a routing metric.