A Scalability Study in Ephemeral Style Intelligent Transportation Systems (ITS)

摘要

Vehicular Ad-Hoc Networks (VANETs) are a class of Dedicated Short Range Communications (DSRC) network model. The Wireless Access Vehicular Environments (WAVE) enhances the medium access control mechanism of the DSRC based networks such as VANETs. The WAVE protocol does not use a contention-based (Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)) protocol, which is known to add a significant amount of delay to the VANETs nodes admission control, instead the WAVE admits vehicular nodes without exchanging node probe, association and authentication messages. This paper provides a robust mechanism to develop a scalable, near-errorless, low latency and high throughput WAVE based solution for safety applications in VANETs. The proposed solution is based on using the MAC layer of 802.11P coupled with multi-channels support. Promising results were obtained using NCTUns simulation. Results show that IEEE802.11P coupled with the multi-channels supports scalable VANETs networks that exhibit 10% or less of dropped packets.