In this paper, we propose the bandwidth borrowing scheme to improve the performance of call admission control schemes and demonstrate the results. In general, the target transmission rates of communications and streaming services are fixed, but data services do not have the target transmission rates. Therefore, we can control the transmission rates for data services flexibly according to the situation. The bandwidth borrowing scheme is implemented by the transmission rates control of data services through the packet scheduler. We make the queueing model for our system model. However, it is difficult to get the analytic solution, so we demonstrate the results through the simulations. The simulation results show that there is a 8.7 - 35.2 dB gain at the total blocking probability according to the use of bandwidth borrowing scheme.