On the effectiveness of cooperation in carrier sense-based ad hoc networks

Authors:
Marco Levorato;Andrea Munari;Michele Zorzi
Affiliations:
Department of Information Engineering, University of Padova, Padova, PD, Italy;Department of Information Engineering, University of Padova, Padova, PD, Italy;Department of Information Engineering, University of Padova, Padova, PD, Italy
Venue:
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
Year:
2009

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Abstract

In this paper, we investigate the effectiveness of cooperative techniques in non-infrastructured ad hoc networks based on carrier sense access control. We point out, via analysis and detailed network simulations, that CSMA biases some fundamental statistics of geographical positioning of terminals available for cooperation. Not only may relay nodes refrain from cooperating due to the carrier sense mechanism, but also the spatial correlation of interference in the network is likely to compress potential cooperators within an area in the proximity of the source. Furthermore, our discussion highlights how issues that affect carrier sense based medium access strategies, such as hidden terminals, reduce the effectiveness of relaying strategies when implemented in large non-centralized networks. The combination of the aforementioned factors is shown to significantly diminish the performance gain granted by cooperative schemes widely studied in the literature from a theoretical perspective.