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The basic idea behind an active queue management (AQM) is to sense thecongestion level within the network and inform the packet sources about, sothat they reduce their sending rate. In literature a lot off mechanisms of AQMare studied. But there are not used in the context of the DiffServ architecturewhere different types of packet with different requirements of QoS share thesame link. In this paper, we study an access control mechanism for RT and NRTpackets arriving in a buffer implemented at an end user in HSDPA. The mechanismuses thresholds to mange access in the buffer and gives access priority to RTpackets. In order to control the arrival rate of the NRT packets in the bufferan active queue management is used. We study the effect of the feedbackfunction on the QoS parameters for both kinds of packets .Mathematicaldescription and analytical results are given, and numerical results show thatthe proposed function achieves higher QoS for the NRT packets in the system.

Effect of the Feedback Function on the QoS in a Time Space Priority with Active Queue Management