Traffic arrival model for millimeter wave 5G NR systems

The introduction of integrated access and backhaul (IAB) technology in beyond 5G systems will result in multiple wireless backhaul links between the user equipment (UE) and the base station (BS). This configuration motivates the research into traffic at the packet level to evaluate the quality of service (QoS) provided to users. At the same time, specifics of directional communications in millimeter wave (mmWave) and terahertz (THz) frequencies with frequent outages caused by blockage and micromobility lead to periods of silence and further rate compensation. In this paper, we consider the traffic as the process of receiving requirements for resource blocks, i.e. the number of resource blocks required to allocate on the BS to provide a constant bit rate at the UE. We propose a Markov model for the specified traffic system that explicitly accounts for such mmWave/THz-specific features as micromobility and blockage effects. Our numerical results demonstrate that the Poisson arrival process assumption underestimates the actual queuing delay at BS by approximately 10%.