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New Cross-Layer Channel Switching Policy for TCP Transmission on 3G UMTS Downlink

Abstract : In 3G UMTS, two main transport channels have been provided 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. In this paper, we propose and analyze three new basic threshold-based channel switching policies for UMTS that we name as QS (Queue Size), FS (Flow Size) and QSFS (QS & FS combined) policy. These policies significantly improve over a modified threshold policy in [1] by about 17% in response time metrics. We further propose and evaluate a new improved switching policy that we call FS-DCH (at-least flow-size threshold on DCH) policy. This policy is biased towards short TCP flows of few packets and is thus a cross-layer policy that improves the performance of TCP by giving priority to the initial few packets of a flow on the fast DCH channel. Extensive simulation results confirm this improvement for the case when number of TCP connections is low.
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Submitted on : Friday, August 4, 2006 - 6:00:54 PM
Last modification on : Thursday, January 20, 2022 - 4:15:13 PM
Long-term archiving on: : Monday, September 20, 2010 - 4:41:57 PM




Dinesh Kumar, Dhiman Barman, Eitan Altman, Jean-Marc Kelif. New Cross-Layer Channel Switching Policy for TCP Transmission on 3G UMTS Downlink. [Research Report] RR-5962, INRIA. 2006, pp.18. ⟨inria-00088730v2⟩



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