Title: Investigation on cooperative contention-based bandwidth request mechanism for heterogeneous networks

Authors: Rajesh Anbazhagan; Nakkeeran Rangaswamy

Addresses: Department of Electronics Engineering, School of Engineering and Technology, Pondicherry University, Puducherry 605 014, India ' Department of Electronics Engineering, School of Engineering and Technology, Pondicherry University, Puducherry 605 014, India

Abstract: In this paper, the suitability of contention parameters that influence the heterogeneous network performance is investigated using cooperative contention-based bandwidth request (BR) scheme. The proposed scheme is unique since contention BR is carried out by wireless local area network (WLAN)/worldwide interoperability for microwave access (WiMAX) gateways (WWG) besides other mobile stations. To improve the contention efficiency with reduced access delay in contention mechanism, we propose failure models by including collision due to contention, channel error, improper detection of code and unavailability of bandwidth. In addition, for effective transmission of BR under these conditions, the stations at various hops update their contention window by appropriate consideration of transmission failure. Upon robust update of contention window, we investigate the cooperative BR by deriving the overall contention efficiency and access delay in heterogeneous networks. Simulation results validate the effectiveness of the derived model.

Keywords: contention bandwidth request; cooperative bandwidth request; worldwide interoperability; microwave access; WiMAX; wireless LANs local area networks; WLANs; medium access control; MAC; failure models; collision; channel error; code detection; bandwidth unavailability; transmission failure; access delay; simulation.

DOI: 10.1504/IJICT.2014.063215

International Journal of Information and Communication Technology, 2014 Vol.6 No.3/4, pp.260 - 271

Received: 01 Feb 2013
Accepted: 27 May 2013
Published online: 26 Jul 2014 *

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