Dynamic joint call admission control algorithm in heterogeneous cellular systems

A dynamic joint call admission control algorithm is designed aiming at the admission control problem in heterogeneous cellular systems. This algorithm adopts TOPSIS method to select the optimal access network and adjusts network cost dynamically according to the system's load distribution, thus balances the load between networks by influencing the user's access selection decision-making. Also, a multi-level access threshold and dynamic bandwidth allocation strategy is adopted for different call pri- orities to further improve system performance and user experience in the stage of access control. Simulation results show that the algorithm pays attention to the user preferences while achieving load balancing, reducing the call blocking probability and dropping rate.