  A novel stochastic geometry framework is proposed in this paper to study the
downlink coverage performance in a millimeter wave (mmWave) cellular network by
jointly considering the polar coordinates of the Base Stations (BSs) with
respect to the typical user located at the origin. Specifically, both the
Euclidean and the angular distances of the BSs in a maximum power-based
association policy for the UE are considered to account for realistic beam
management considerations, which have been largely ignored in the literature,
especially in the cell association phase. For completeness, two other
association schemes are considered and exact-form expressions for the coverage
probability are derived. Subsequently, the key role of angular distances is
highlighted by defining the dominant interferer using angular distance-based
criteria instead of Euclidean distance-based, and conducting a dominant
interferer-based coverage probability analysis. Among others, the numerical
results revealed that considering angular distance-based criteria for
determining both the serving and the dominant interfering BS, can approximate
the coverage performance more accurately as compared to utilizing Euclidean
distance-based criteria. To the best of the authors$'$ knowledge, this is the
first work that rigorously explores the role of angular distances in the
association policy and analysis of cellular networks.
