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Pré-Publication, Document De Travail Année : 2010

Modeling and analysis of slotted and non-slotted Aloha in linear Vehicular Ad-hoc NETworks

Résumé

The aim of this paper is to study slotted and non-slotted Aloha medium access (MAC) scheme in Vehicular Ad-hoc NETworks (VANETs). To this regard, we consider a one- dimensional, liner network, which is an appropriate assumption for VANETs and differs from two-dimensional, planar models usu- ally assumed for general Mobile Ad-hoc NETworks (MANETs). More precisely, we use a linear version of the Poisson bipolar network model proposed in Baccelli and Blaszczyszyn (2009) [see http://hal.inria.fr/inria-00403040], in which the locations of signal emitting vehicles form a homogeneous Poisson point process on the line, and where the receivers are within a fixed distance form these emitters. We use the well-established signal-over- interference and noise ratio (SINR) capture model assuming power-law mean path-loss and independent Rayleigh fading. First, we consider a capture/outage scenario with fixed bit rate coding, where the SINR must above a given threshold for a successful packet reception. In this setting we obtain explicit formulas to calculate the probability of capture for both slotted and non- slotted Aloha. From these formulas other characteristics, as the mean density of packet progress, are derived and optimized in MAC parameters. We consider also adaptive coding, where the throughput depends on the SINR. In this scenario we quantify and optimize the mean density of information throughput. Our unified approach to slotted and non-slotted Aloha allows for explicit comparison of both versions of this simple MAC. The obtained results differ quantitatively and even qualitatively from these obtained previously in the analogous analysis of planar MANETs, reveling some specificity of the optimal tuning of the MAC layer in the linear network topology.
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Dates et versions

inria-00530080 , version 1 (27-10-2010)
inria-00530080 , version 2 (04-05-2012)

Identifiants

  • HAL Id : inria-00530080 , version 1

Citer

Bartlomiej Blaszczyszyn, Paul Mühlethaler, Yasser Toor. Modeling and analysis of slotted and non-slotted Aloha in linear Vehicular Ad-hoc NETworks. 2010. ⟨inria-00530080v1⟩
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