  High Speed Downlink Packet Access (HSDPA) was introduced to UMTS radio access
segment to provide higher capacity for new packet switched services. As a
result, packet switched sessions with multiple diverse traffic flows such as
concurrent voice and data, or video and data being transmitted to the same user
are a likely commonplace cellular packet data scenario. In HSDPA, Radio Access
Network (RAN) buffer management schemes are essential to support the end-to-end
QoS of such sessions. Hence in this paper we present the end-to-end performance
study of a proposed RAN buffer management scheme for multi-flow sessions via
dynamic system-level HSDPA simulations. The scheme is an enhancement of a
Time-Space Priority (TSP)queuing strategy applied to the Node B MAC-hs buffer
allocated to an end user with concurrent real-time (RT) and non-real-time (NRT)
flows during a multi-flow session. The experimental multiflow scenario is a
packet voice call with concurrent TCP-based file download to the same user.
Results show that with the proposed enhancements to the TSP-based RAN buffer
management,end-to-end QoS performance gains accrue to the NRT flow without
compromising RT flow QoS of the same end user session.
