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High Speed Downlink Packet Access (HSDPA) is being increasingly deployed to enhance UMTS Radio Access Networks. Scheduling of Node B (base station) buffered user data for transmission over a shared radio channel is a key HSDPA functionality which enables queue management techniques to be utilized to improve Quality of Service (QoS) for mixed `multimedia' services. In this paper, we study a control access scheme of multimedia stream in HSDPA channel. The control scheme consists in putting thresholds in the channel in order to well manage the access of the various packets by giving priority of access to the packets at real time. The RT arrival is modeled by a Poisson process and the NRT arrival by a Markovian Arrival Process (MAP) with two states. We use stochastic reward Nets (SRN) approach to derive QoS metrics of this control. Obtained results show the impact of workload aspects (e.g., arrival rate and service rate) and system capacity on two performance measures: mean response delay and job blocking probability.