Performance Modelling of a Queue Management Scheme With Rate Control for HSDPA

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 QoS provisioning for mixed 'Multimedia' services. Thus, the authors have previously proposed and studied a Time-Space Priority (TSP) buffer management scheme for 'Multimedia' QoS control in HSDPA Node B. In this paper, the scheme is extended to incorporate a threshold-based rate control mechanism which provides flow control between the RNC and Node B entities over the Iub interface to improve the QoS performance of Non-Real-Time (NRT) streams in the multimedia flow.