Abstract: In micro-cell and micro-cell environment for 3G mobile communication, the probability of call handover dropping due to mobile users or congestion of new calls becomes an important parameter that determines the QoS of the system. Although there are some schemes available to improve the performance of call handover, they will all be done at the expense of sacrificing new calls. To resolve effectively the contradiction between call handover dropping and congestion of new calls, a new call admission scheme is proposed on the basis of the existing fractional guard channel scheme with the congestion of new calls taken into account. Compared to the commonly used call admission scheme, it can improve well the performance of the system. The simulation on computer showed that it is satisfactory.