Millimeter wave (mmWave) communication is
considered as the most promising solution for future 5G cellular
networks. However, it suffers from a severe propagation loss
causing dramatic link quality degradation and limiting its coverage
area. Antenna beamforming appears to be a suitable solution to
overcome this problem and provides longer transmission outdoor
mmWave links. Accordingly, highly complicated conventional
beamforming training (BT) techniques based on exhaustively
searching all beam settings in all possible directions are used for
mmWave discovery and association. This results in a long-time
delay and a high-power consumption mmWave small cell discovery
and association due to the large BT overhead. In this paper, a
paradigm of mmWave small cell BT, discovery and association
based on WiFi localization is proposed especially for local outdoor
urban environments, e.g., campus area. Due to the use of
beamforming, mmWave becomes a location-driven wireless
communication system, hence positioning can extremely relax the
complexity of mmWave link establishment. Simulation results
show the high potency of the proposed scheme in reducing the
complexity of mmWave BT, discovery and association compared
to the conventional scheme of exhaustively searching all beam
directions