Estimating the upper bound of transmission capacity in linear VANET

The IEEE 802.11p VANET has been studied by academia and industry for many years. In this paper the upper bound of transmission capacity in linear VANET is deduced and evaluated. The maximum of simultaneous transmitters within dedicated areas, which is widely accepted as the indicator of transmission capacity, is constrained by the CSMA/CA or EDCA mechanism in 802.11p. To estimate the upper bound, a linear road scenario is built and one determined uniform distribution of transmitting vehicles is proved to contain maximal number of simultaneous transmitters; then the upper bound of transmission capacity is proposed; finally simulation results show that the bound offers a good constraint for the transmission capacity in linear VANET.