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In order to ensure that the interference-limited multimedia code division multiple access mobile communication systems operate stably and reliably, a novel fast adaptive call admission control (FACAC) algorithm for wide-band code division multiple access air interface is introduced. The proposed algorithm operates a threshold comparison, which integrates many factors that affect the decision accuracy of a call admission control such as system load, quality of service, channel quality, interference level and so on. The proposed FACAC algorithm cooperates subtly with a power control and data rate adjustment scheme making able fast, accurate, adaptive threshold, simple and feasible decision-making about incoming calls. Simulation results verify the correctness of theoretic derivations and show that the proposed FACAC algorithm outperforms previous call admission control schemes in terms of overall system dropping probability and service blocking properties, respectively. It is believed that FACAC is a requisite algorithm for the next generation mobile communications systems.