  mm-Wave communication systems use narrow directional beams due to the
spectrum's characteristic nature: high path and penetration losses. The mobile
and the base station primarily employ beams in line of sight (LoS) direction
and when needed in non-line of sight direction. Beam management protocol adapts
the base station and mobile side beam direction during user mobility and to
sustain the link during blockages. To avoid outage in transient pedestrian
blockage of the LoS path, the mobile uses reflected or NLoS path available in
indoor environments. Reflected paths can sustain time synchronization and
maintain connectivity during temporary blockages. In outdoor environments, such
reflections may not be available and prior work relied on dense base station
deployment or co-ordinated multi-point access to address outage problem.
  Instead of dense and hence cost-intensive network deployments, we found
experimentally that the mobile can capitalize on ground reflection. We
developed TERRA protocol to effectively handle mobile side beam direction
during transient blockage events. TERRA avoids outage during pedestrian
blockages 84.5 $\%$ of the time in outdoor environments on concrete and gravel
surfaces. TERRA also enables the mobile to perform a soft handover to a reserve
neighbor base station in the event of a permanent blockage, without requiring
any side information, unlike the existing works. Evaluations show that TERRA
maintains received signal strength close to the optimal solution while keeping
track of the neighbor base station.
