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In 3G UMTS, two main transport channels have been provided at the layer-2 (MAC) for downlink data transmission: a common FACH channel and a dedicated DCH channel. The performance of TCP in UMTS depends much on the channel switching policy used. This paper first proposes and analyzes three new basic threshold-based channel switching policies for UMTS that the authors name as QS (Queue Size), FS (Flow Size) and QSFS (QS & FS combined) policy. These policies significantly improve over a 'Modified Threshold Policy' in by about 17% in response time metrics.
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