Congestion control vs. link failure: TCP behavior in mmWave connected vehicular networks

Abstract The millimeter-wave (mmWave) frequency band presents a viable communication platform for the exchange of large amount of data and communications of Connected Vehicular Networks (CVNs). Its ability to support multi-gigabit data rates and high spatial reuse is especially crucial because of the large volume of data produced by physical entity each second. However, its susceptibility the deafness problem, blockages, and beam misalignment is a major impediment, especially in highly mobile environment such as CVNs. Especially, CVNs are related to the life of human being, network reliability is one of the most important issue. To resolve this problem, recent studies on mmWaves have focused more on the PHY/MAC Layers, while fewer studies have examined the transport layer. In this paper, we examine the performance of TCP in mmWave based vehicular networks, focusing particularly on the effects of congestion and link failure. In addition, we highlight the problems of using conventional TCP in an mmWave CVNs and propose an real-time wireless TCP (RTW-TCP) implementation such mmWave environment. Finally, we compare the performance of the proposed RTW-TCP and conventional TCP. The simulation results show that the proposed scheme maximizes the total network resources by distinguishing link failure from network congestion in an mmWave CVNs.