  Many spectrum methods have been proposed to use spectrum effectively, the
opportunistic spectrum access has become the most viable approach to achieve
near-optimal spectrum utilization by allowing secondary users to sense and
access available spectrum opportunistically. However, a naive spectrum access
for secondary users can make spectrum utilization inefficient and increase
interference to adjacent users. In this paper, we propose a novel approach
using Fuzzy Logic System (FLS) to control the spectrum access. We have to
minimize the call blocking and interference. The linguistic knowledge of
spectrum access are based on three descriptors namely spectrum utilization
efficiency of the secondary user, its degree of mobility, and its distance to
the primary user. The spectrum is chosen for accessing based on the maximum
possibility for better utilization of the spectrum
