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A modified 802.11-based MAC scheme to assure fair access for vehicle-to-roadside communications

Karamad, E ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1016/j.comcom.2008.01.030
  3. Publisher: 2008
  4. Abstract:
  5. Vehicular ad hoc networks (VANets) are special cases of mobile ad hoc networks (MANets) in which the mobility pattern is very different. Actually, the topology of the network in VANets changes more often and the variance of speeds is high. Such characteristics lead to fairness problem in VANets, considered in this paper. In fact, vehicles with different speeds have their different limited time to communicate with an access point (AP). This attribute adversely affects the chance of a fast moving vehicle in communicating with the access point. We propose a modified 802.11 DCF channel access scheme as a solution to the problem. The proposed scheme adjusts the probability of transmission at a time slot for each node according to its speed. To this end, we change the probability of transmission through changing the minimum contention window size. In this respect, we obtain some relations between speed and window size through analytical approximations. Simulation results indicate the validity of our approximations and the efficiency of the proposed MAC scheme in solving the fairness problem. © 2008 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Approximation theory ; Computer networks ; Lead ; Metropolitan area networks ; Mobile telecommunication systems ; Network protocols ; Probability ; Real time systems ; Speed ; Vehicle transmissions ; Vehicles ; Windows ; Wireless telecommunication systems ; 802.11 DCF ; Access point (AP) ; Analytical approximations ; Channel access (CA) ; Contention window size ; Different speeds ; Elsevier (CO) ; Fairness problems ; Marker and cell (MAC) scheme ; Mobile ad hoc networks (MANeTs) ; Mobility patterns ; Moving vehicles ; Simulation results ; Time slot (TS) ; Vehicular ad-hoc networks (VANeTs) ; Window sizes ; Ad hoc networks
  8. Source: Computer Communications ; Volume 31, Issue 12 , 30 July , 2008 , Pages 2898-2906 ; 01403664 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0140366408000285