  Fifth generation (5G) wireless technology is expected to utilize highly
directive antennas at millimeter wave (mmWave) spectrum to offer higher data
rates. However, given the high directivity of antennas and adverse propagation
characteristics at mmWave frequencies, these signals are very susceptible to
obstacles. One of the important factors that are highly impacted is
interference behavior. In fact, signals received from other terminals can be
easily blocked or attenuated at the receiver. In addition, higher number of
terminals can transmit signals without introducing much interference and hence
the traffic behavior, maintained by medium access control (MAC) layer, may
change. In this paper, we provide an interference model to evaluate the
interference power received at the physical layer of the receiving terminal,
considering antenna directivity, effect of obstacles and MAC layer constraints
that control the number of terminals transmitting simultaneously. We first
develop a blockage model and then derive the Laplace transform of the
interference power received at a typical receiving node. Subsequently, using
the derived Laplace transform, we evaluate the network error performance using
average bit-error-rate (BER). Analytical results are validated via Monte-Carlo
simulations.
