Tampere University of Technology

TUTCRIS Research Portal

On the Temporal Effects of Mobile Blockers in Urban Millimeter-Wave Cellular Scenarios

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)10124-10138
JournalIEEE Transactions on Vehicular Technology
Volume66
Issue number11
DOIs
Publication statusPublished - 2017
Publication typeA1 Journal article-refereed

Abstract

Millimeter-wave (mmWave) propagation is known to be severely affected by the blockage of the line-of-sight (LoS) path. In contrast to microwave systems, at shorter mmWave wavelengths such blockage can be caused by human bodies, where their mobility within environment makes wireless channel alternate between the blocked and non-blocked LoS states. Following the recent 3GPP requirements on modeling the dynamic blockage as well as the temporal consistency of the channel at mmWave frequencies, in this paper a new model for predicting the state of a user in the presence of mobile blockers for representative 3GPP scenarios is developed: urban micro cell (UMi) street canyon and park/stadium/square. It is demonstrated that the blockage effects produce an alternating renewal process with exponentially distributed non-blocked intervals, and blocked durations that follow the general distribution. The following metrics are derived (i) the mean and the fraction of time spent in blocked/non-blocked state, (ii) the residual blocked/non-blocked time, and (iii) the time-dependent conditional probability of having blockage/no blockage at time t1 given that there was blockage/no blockage at time t0. The latter is a function of the arrival rate (intensity), width, and height of moving blockers, distance to the mmWave access point (AP), as well as the heights of the AP and the user device. The proposed model can be used for system-level characterization of mmWave cellular communication systems. For example, the optimal height and the maximum coverage radius of the mmWave APs are derived, while satisfying the required mean data rate constraint. The system-level simulations corroborate that the use of the proposed method considerably reduces the modeling complexity.

Keywords

  • 3GPP, Analytical models, Biological system modeling, Cellular networks, Correlation, human body blockage, Mathematical model, mmWave, Mobile communication, mobility of blockers, temporal consistency, Vehicle dynamics

Publication forum classification