Autobot: An Emulation Environment For Cellular Vehicular Communications The rising interest in Intelligent Transportation Systems shines light on a complex task: The evaluation of new applications and services that could prevent accident, regulate traffic, and help the automotive industry in designing energy efficient vehicles. These applications will rely on a new communication channel between vehicles, infrastructure and cloud services, and will have to operate under various network performances. However, testing applications and services in reallife networks is costly and reproducing network behaviour in a controlled environment is challenging. Furthermore, simulation tools lack realtime evaluation capabilities. Therefore, we present in this paper an environment for the realtime emulation of cellular vehicular communications. It allows the user to rapidly and cost efficiently implement and test applications under realistic mobile network performances.

Overtheair emulation of a twopath model for automotive LTE system performance testing Overtheair testing is, in combination with the concept of radio channel emulation, a feasible solution for the evaluation of automotive radio systems during every stage of development. Suitable and representative test scenarios need to be investigated, since it is impossible to completely test the multitude of potential radio environments, and real drive tests are very expensive, time consuming, and hardly reproducible. This paper proposes a basic twopath propagation model as a basis for performance testing because of its relevance in wireless communications and the potential to adjust worstcase transmission conditions. The model has been successfully implemented in our multipurpose test facility. The implementation has been verified by interference measurements in the signal domain at RF level. Measured values compare favourably with expectation. Application oriented verification has been achieved by creating a functional LTE link in our shielded anechoic chamber and has been used to conduct endtoend data throughput tests. The measured data throughput follows the expected interference pattern.