Resumen de A Novel 802.11 Contention Window Control Scheme for Vehicular Environments
Ali Balador, Carlos T. Calafate, Juan-Carlos Cano Escribá
Intelligent Transportation Systems (ITS)have attractive potential in order to decrease the ordinarytraffic jams and avoid transportation disasters.Also, they are able to provide various infotainmentservices like browsing, reading e-mail or using socialnetworks that makes a trip more interesting. In orderto make it more efficient in real vehicular environments,achieving a well-designed Medium AccessControl (MAC) protocol is a challenging issue dueto the dynamic nature of VANETs, scalability issues,and the variety of application requirements. Differentstandardization organizations have selected IEEE802.11 as the first choice for VANET environmentsconsidering its availability, maturity, and cost. Theresearch results for IEEE 802.11 MAC protocol showthe importance of contention window adjustment onthe communications performance. The impact of adjustingthe contention window has been studied inMANETs, but the vehicular communication communityhas not yet addressed this issue thoroughly.This paper proposes e-HBCWC, a new contentionwindow control scheme for VANET environmentsbased on estimating the network condition. Analysisand simulation results using OMNeT++ in urbanscenarios show that e-HBCWC clearly outperforms802.11 DCF, even in very high network density, byincreasing the packet delivery rate while decreasingthe number of collisions and the end-to-end delay forunicast applications.
