  Ultra-low latency and high reliability communications are the two defining
characteristics of Tactile Internet (TI). Nevertheless, some TI applications
would also require high data-rate transfer of audio-visual information to
complement the haptic data. Using Millimeter wave (mmWave) communications is an
attractive choice for high datarate TI applications due to the availability of
large bandwidth in the mmWave bands. Moreover, mmWave radio access is also
advantageous to attain the airinterface-diversity required for high reliability
in TI systems as mmWave signal propagation significantly differs to sub-6GHz
propagation. However, the use of narrow beamwidth in mmWave systems makes them
susceptible to link misalignment-induced unreliability and high access latency.
In this paper, we analyze the trade-offs between high gain of narrow beamwidth
antennas and corresponding susceptibility to misalignment in mmWave links. To
alleviate the effects of random antenna misalignment, we propose a
beamwidth-adaptation scheme that significantly stabilize the link throughput
performance.
