We design and evaluate the performance of a new unified mechanism for downlink scheduling and Call Admission Control (CAC) of multimedia traffic in a high-capacity TDMA wireless channel. In our scheme, the Base Station interacts with the Call Admission Controller and incorporates predictions on the channel condition in its decision making. Our results show that, with the use of the "intelligent" scheduler-admission controller mechanism, system performance is significantly enhanced compared to two other schemes without prediction on the channel condition.