  Beam alignment is required in millimeter wave communication to ensure high
data rate transmission. However, with narrow beamwidth in massive MIMO, beam
alignment could be computationally intensive due to the large number of beam
pairs to be measured. In this paper, we propose an efficient beam alignment
framework by exploiting the location information of the user equipment (UE) and
potential reflecting points. The proposed scheme allows the UE and the base
station to perform a coordinated beam search from a small set of beams within
the error boundary of the location information, the selected beams are then
used to guide the search of future beams. To further reduce the number of beams
to be searched, we propose an intelligent search scheme within a small window
of beams to determine the direction of the actual beam. The proposed beam
alignment algorithm is verified on simulation with some location uncertainty.
