  In the modern era, cellular communication consumers are exponentially
increasing as they find the system more user-friendly. Due to enormous users
and their numerous demands, it has become a mandate to make the best use of the
limited radio resources that assures the highest standard of Quality of Service
(QoS). To reach the guaranteed level of QoS for the maximum number of users,
maximum utilization of bandwidth is not only the key issue to be considered,
rather some other factors like interference, call blocking probability etc. are
also needed to keep under deliberation. The lower performances of these factors
may retrograde the overall cellular networks performances. Keeping these
difficulties under consideration, we propose an effective dynamic channel
borrowing model that safeguards better QoS, other factors as well. The proposed
scheme reduces the excessive overall call blocking probability and does
interference mitigation without sacrificing bandwidth utilization. The proposed
scheme is modeled in such a way that the cells are bifurcated after the channel
borrowing process if the borrowed channels have the same type of frequency band
(i.e. reused frequency). We also propose that the unoccupied interfering
channels of adjacent cells can also be inactivated, instead of cell bifurcation
for interference mitigation. The simulation endings show satisfactory
performances in terms of overall call blocking probability and bandwidth
utilization that are compared to the conventional scheme without channel
borrowing. Furthermore, signal to interference plus noise ratio (SINR) level,
capacity, and outage probability are compared to the conventional scheme
without interference mitigation after channel borrowing that may attract the
considerable concentration to the operators.
