University of Twente Student Theses


Optimisation of packet scheduling in wireless networks

Schouten, J.H. (2009) Optimisation of packet scheduling in wireless networks.

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Abstract:The research objective of this study is to investigate the sensitivity of the optimal parameter settings for packet scheduling algorithms in wireless networks, loaded with voice and data tra±c, with respect to variations in network, tra±c and channel conditions. We investigate this sensitivity by means of a mathematical analysis and a simulation model. In the mathematical model we use time scale decomposition between the packet and °ow level. Scheduling algorithms operate at the packet level at which the user population is relatively stable. The flow level dynamics, due to flow transfer initiations and completions, causes the number of ongoing °ow transfers to vary over time, typically at a timescale of seconds. Our modelling approach captures the packet level and flow level behaviour and basically consists of two steps. In the first step we consider the packet level and derive mathematical expressions for the long-term rate that users can expect in a given system state indicated by the number of active flows. In the second step we incorporate these rates in a Markov chain model to analyse flow level performance for the users of the mobile wireless network.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Applied Mathematics MSc (60348)
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