Assessing the characteristics of 5G/6G “new radio” systems with user's macro- and micromobility

The performance of 5G/6G cellular “new radio” systems is typically evaluated using static user location and perfectly directional antennas which are justified in the case of regular synchronisation between the user equipment (UE) and the base station (BS). However, in the case of high energy-efficient UEs with limited RedCap functionality, BS is less likely to get information about the quality of the signal received by the device which changes when the UE moves. This leads to the need to investigate the dynamics of the performance indicators of systems with RedCap UEs over time. In the paper, tools of stochastic geometry and random walk theory are used to analyze the spectral efficiency depending on the distance between the BS and the UE and the directionality of the UE antenna at a random moment of time. A numerical experiment has shown that macromobility has a significant impact on the spectral efficiency, the impact of micromobility is smaller and appears only at short time intervals, while the size of the phased antenna array on the BS side practically does not affect the obtained result.