In this paper, we propose then a novel CAC algorithm that provides the desired throughput guarantees on the basis of the vehicle density and the nodes' transmission range in 802.11p
vehicular ad hoc networks.
 is specifically designed to support vehicular network applications, which defines the general framework for multichannel management.
The base for WAVE is IEEE 802.11p
standard draft, which together with IEEE 1609.1/2/3/4 describes inter-vehicle communication.
IEEE 1609.4 specifies the extension to the IEEE 802.11p
medium access control (MAC) for multi-channel operations .
To support ITS, the IEEE 802.11p
Dedicated Short Range Communications (DSRC)  has been standardized for Wireless Access in Vehicular Environments (WAVE), including Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I).
In this paper, the single-carrier combined with the frequency domain equalizer (SC-FDE) is utilized as an alternative to the OFDM over the IEEE 802.11p
uplink vehicular channels.
Liu, "Performance and reliability analysis of IEEE 802.11p
safety communication in a highway environment," IEEE Transactions on Vehicular technology, vol.
and IEEE 1609.x protocol family have been widely accepted standards for VANET.
In , application-level control of the message transmission phase is suggested rather than 802.11p
MAC, when frequency adaptation is not allowed due to the application requirement.