Hans-Juergen Reumerman

An error model for inter-vehicle communications in highway scenarios at 5.9GHz

The design and evaluation of Inter-Vehicle Communication (IVC) protocols rely much on the accurate and efficient computational simulations. For simulations of Medium Access Control (MAC) and higher layers, the modeling work of underlying Physical layer (PHY) and wireless channel has impacts both on the computational efficiency of simulations and on the correctness of results. In this contribution, we discuss the modeling issues of the inter-vehicle wireless channel in highway scenarios and the packet error performance of Dedicated Short Range Communications (DSRC) PHY, which works at the newly allocated 5.9GHz Intelligent Transportation System (ITS) frequency band. A computationally efficient yet accurate enough error modeling approach used in our MAC layer simulator WARP2 is presented in this paper, together with simulation results. Both weaknesses and potential improvements of the proposed approach are discussed also in this work.

Vehicular wireless media network (VWMN): a distributed broadband MAC for inter-vehicle communications

The allocation of 75MHz spectrum in the 5.9GHz band for Dedicate Short Range Communications (DSRC) in North America makes it possible to deliver high data rate multimedia applications via vehicle-to-roadside and even vehicle-to-vehicle wireless links. However, Medium Access Control (MAC) protocols mostly studied for DSRC systems are designed for safety relevant applications and insufficient for high data rate multimedia applications. In this work we propose a novel MAC solution, namely Vehicular Wireless Media Network (VWMN), based on a distributed beaconing scheme. The VWMN MAC is designed to support both time critical safety relevant applications and high data rate multimedia applications in Vehicular Ad hoc Networks (VANETs), especially with multiple channels and in multi-hop scenarios. The most challenging issues faced by Inter-Vehicle Communications (IVC), i.e. synchronization and dynamic topology control, are discussed as well based on the VWMN MAC with proposed solutions.