  3GPP NR V2X represents the new 3GPP standard for next-generation vehicular
systems which, among other innovations, supports vehicle-to-vehicle (V2V)
operations in the millimeter wave (mmWave) spectrum to address the
communication requirements of future intelligent automotive networks. While
mmWaves will enable massive data rates and low latency, the propagation
characteristics at very high frequencies become very challenging, thereby
calling for accurate performance evaluations as a means to properly assess the
performance of such systems. Along these lines, in this paper MilliCar, the new
ns-3 module based on the latest NR V2X specifications, is used to provide an
end-to-end performance evaluation of mmWave V2V networks. We investigate the
impact of different propagation scenarios and system parameters, including the
inter-vehicle distance, the adopted frame numerology, and the modulation and
coding scheme, and provide guidelines towards the most promising V2V deployment
configurations.
