In this paper, we addressed the ‘Hidden Channel’ problem in an enterprise 802.11ac network. The HC problem occurs due to the heterogeneity of devices using different bandwidths. Also, the fixed transmission power results in different power density, which affects channel sensing/reserving ranges. Therefore we analyzed the HC problem scenario in the first part of this paper to understand the impact of CSMA contention parameter variations on asymmetric channel sensing/reserving behaviors. Through simulations, we confirmed the validity of our analytical model. The contention window sizes of an invader and a victim along with the packet transmission time of the victim mainly affect the performance with respect to collision probability and fairness. Under different scenarios, we observed that the performance of the victim fluctuates heavily while that of the invader is stable. This leads to the performance asymmetry between an invader and a victim, in terms of collision probability, fairness and stability