Scheduling for time-division based shared channel allocation for UMTS
Journal
Wireless Networks
Journal Volume
13
Journal Issue
2
Pages
189-202
Date Issued
2007
Author(s)
Abstract
The Universal Mobile Telecommunications System (UMTS) adopts the WCDMA technology as the radio access interface to provide variable transmission rate services. There are four classes of connections identified in UMTS, which are the conversational, streaming, interactive, and background connections. To efficiently utilize radio bandwidth, the shared channel approach is proposed to deliver the packets for the interactive and background connections. This paper proposes a "Shared-Channel Assignment and Scheduling" (SCAS) algorithm to periodically allocate shared channels to serve interactive and background connections. We conduct formal mathematical proofs and simulation experiments to investigate the performance of the SCAS algorithm. We formally prove that with SCAS, a shared channel can be fully utilized (i.e., the utilization of a shared channel can be up to 100%) to serve the interactive connections. Our analysis indicates that compared with the previously proposed shared channel allocation and scheduling algorithms, there are less computation and communication overheads introduced in the SCAS algorithm. The results of the simulation experiments indicate that it is preferred to set up the Transmission Time Interval (TTI; that is, the unit of time interval for shared channel allocation) smaller to optimize the performance of the SCAS algorithm, including the shared channel utilization and the average waiting time of a connection before getting transmission service. © Springer Science + Business Media, LLC 2006.
Subjects
Downlink shared channel; Orthogonal variable spreading factor; Universal mobile telecommunications system; Wide-band code division multiple access
Other Subjects
Algorithms; Bandwidth; Code division multiple access; Communication channels (information theory); Computer simulation; Interfaces (computer); Downlink shared channel; Orthogonal variable spreading factors; Universal mobile telecommunications system; Wideband code division multiple access; Wireless telecommunication systems
Type
journal article
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