Abstract: This paper first described the architecture and the main services of the wireless network oriented ITS (Intelligent Transportation System).The services of Cooperative Vehicle-Infrastructure System and PTT voice were analyzed and modelled.Pointed scheduling schemes were proposed for different services according to their QoS requirements.For the service of Cooperative Vehicle-Infrastructure System,vehicle speed adapted dynamic scheduling is adopted.For the service of PTT voice,scheduling based on state transition is adopted.For the video and other services which are not sensitive to delay,scheduling request is generated based on buffer status.Finally,the scheduling schemes were simulated on OPNET,from which the availability was verified with performance curve of delay and packet loss rate.This also provides reference for ITS access network design.

Key words: Intelligent transportation system,Wireless access networks,QoS,Scheduling schemes,OPNET