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Provisioning Delay Sensitive Services in Cognitive Radio Networks by Opportunistically Sharing Spectrum from CSMA/CA Networks

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2 Author(s)
Hasan, R. ; Gippsland Sch. of IT, Monash Univ., Churchill, VIC, Australia ; Murshed, M.

Cognitive radio network (CRN) users are inherently expected to experience widely varied delays and jitters due to the uncertainty in channel availability. Supporting delay sensitive real-time services through CRNs thus remains a challenging task. This paper presents a novel technique to provision QoS guarantee in CRNs by modeling the resultant channel of multiple primary networks and finding the optimum number of primary channels to support a desired level of expected latency. In doing so, this paper introduces a cognitive radio based MAC, which can effectively co-exists with primary CSMA/CA networks by accurately estimating the start of the spectrum holes, reliably modeling channel occupation by the primary users, and using event-driven sensing to adaptively control the sensing frequency and interval. Simulation results with ns-2.33 reveal that a CR network based on the proposed MAC can achieve the targeted service delay time by appropriately selecting optimal WLAN primary channels.

Published in:

High Performance Computing and Communications (HPCC), 2010 12th IEEE International Conference on

Date of Conference:

1-3 Sept. 2010