This paper proposes a call admission control (CAC) scheme for direct sequence code division multiple access (DS-CDMA) cellular systems supporting mobile multimedia communications services. We consider the systems with multiple call classes in which the required signal-to-interference ratio (SIR) varies according to call classes. The call admission decision in the proposed scheme is based on SIR measurement. The proposed scheme takes account of the traffic asymmetry between uplink and downlink and guarantees the priority of handoff call requests over new call requests. We evaluate the performance of the proposed scheme using Markov analysis and present some numerical examples. As a result, we show that the proposed CAC scheme can operate well in the mobile multimedia systems such as the International Mobile Telecommunications-2000 (IMT-2000) systems.
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