CDMA systems have a trade-off relationship between the frame error rate (FER) and the number of accepted users. Therefore, the call admission control (CAC) scheme is essential for guaranteeing the FER below the required value, which is the measure of the quaility of service (QoS) in the frame level. In cellular networks, the dropping probability of handoff calls is another critical measure for QoS in the call level. There have been, nevertheless, little concern for CAC schemes guaranteeing

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... QoS requirements simultaneously in the CDMA cellular networks. In this paper, we propose CACs that track the time-varying capacity of CDMA systems by estimating the distribution of the total received power at a basestation, thereby realizing the bandwidth reservation scheme to meet the QoS requirement for handoff calls in the call level.