Cooperative Gigabit Content Distribution With Network Coding for mmWave Vehicular Networks

Millimeter-wave (mmWave) directional communication has been deemed as a promising means to achieve the goal of multi-gigabit data rate with low latency in vehicular ad-hoc networks (VANETs). However, due to the frequent transmission errors caused by the lossy nature of mmWave wireless links and high dynamic of VANETs, the channel resources are not fully exploited. In order to enhance the resilience to transmission errors, we introduce the symbol level network coding (SLNC) to mmWave wireless communications. We propose a greedy network coding strategy based on graph-theoretic approach, named GTNC, so as to take full advantage of SLNC. Moreover, considering the directionality of mmWave and the effect of GTNC on degrading transmission redundancy, it has great potential to realize concurrent transmission in mmWave vehicular networks. Therefore, we propose a cooperative concurrent distribution scheme with GTNC, named CCDS-GTNC, to coordinate transmissions between vehicles, which carries out collaborative vehicle-to-vehicle (V2V) and vehicle-to-Infrastructure (V2I) communications and achieves concurrent transmissions of multiple transmitters simultaneously. The simulation results show that our proposed scheme can effectively improve the efficiency of content dissemination in view of reducing the transmission delay and transmission redundancy.