Characterization of Spatial Consistency of Millimeter Wave Cluster
Channel in Urban Environments
Abstract
Currently, millimeter-wave (mm-wave) based wireless communications in
the 30 to 300 GHz frequency band are attracting new attention because
the existing frequency band below 6~GHz is very
congested. In order to use the mm-wave bands for designing and assessing
next-generation mobile systems, it is essential to characterize its
propagation channel considering the spatial consistency (SC) for
non-stationary user equipment in an outdoor environment. Since the
mm-wave band has different characteristics from the microwave band, 3GPP
has proposed an SC procedure that provides spatial correlation to
clusters for beam-tracking evaluation in dynamic scenarios. However,
this letter reports on the evaluation of SC of clusters in terms of
cluster visible region based on the obtained measured data in two
different mm-wave frequencies, 24 GHz and 60 GHz, in urban environments.
The visible region is estimated by tracking the available clusters using
the fourth-dimensional spatiotemporal multipath parameters: the
departure/arrival angles (azimuth), delay time, and cluster power. The
obtained visible regions for two different frequencies and scenarios are
compared and confirmed the dependencies of SC of the clusters on
frequency and environment.