Evaluating effect of interference on MAC delay in densely deployed IEEE 802.11ad based In-vehicle communications

This paper evaluates MAC-layer delay of IEEE 802.11ad based In-vehicle communications, where strong interference from multiple devices on own and other vehicles could occur stochastically due to beamforming. The wide frequency bandwidth of IEEE 802.11ad is expected to enable ultra-low latency in-vehicle communications. However, the beamforming of IEEE 802.11ad causes strong interference and could degrade the delay performance. To investigate the impact of the beamforming interference on delay performance, we conducted network simulations using ns3. The results show that a control method, fixed contention window (CW), achieved the maximum delay of 2 msec, whereas conventional control method, Distributed Coordination Function (DCF), did larger delay of 12 msec.