Roland de Haan
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Roland received his master's degree in Industrial and Applied Mathematics from the Technical University of Eindhoven. His final master's project on performance modelling of TCP was carried out at TNO-ICT (Delft). Directly afterwards, he successfully applied for a one-year scholarship which enabled him to work as a research assistant at the Instituto de Telecomunica»c~oes in Lisbon (Por- tugal) on analytical models for multiple-access protocols. In 2005, Roland returned to the Netherlands and started working towards his PhD degree in the Stochastics Operations Research group at the University of Twente.In 2009, he finished his Ph.D. thesis on 'Queueing Models for Mobile Ad Hoc Networks'
This thesis presents models for the performance analysis of a recent communication paradigm:
mobile ad hoc networking. The objective of mobile ad hoc networking is to provide wireless
connectivity between stations in a highly dynamic environment. These dynamics are driven by the
mobility of stations and by breakdowns of stations, and may lead to temporary disconnectivity of
parts of the network. Applications of this novel paradigm can be found in telecommunication services,
but also in manufacturing systems, road-traffic control, animal monitoring and emergency networking.
The performance of mobile ad hoc networks in terms of buffer occupancy and delay is quantified in this thesis by employing specific queueing models, viz., time-limited polling models. These polling models capture the uncontrollable characteristic of link availability in mobile ad hoc networks. Particularly, a novel, so-called pure exponential time-limited, service discipline is introduced in the context of polling systems.
The highlighted performance characteristics for these polling systems include the stability, the queue lengths and the sojourn times of the customers. Stability conditions prescribe limits on the amount of traffic that can be sustained by the system, so that the establishment of these conditions is a fundamental keystone in the analysis of polling models. Moreover, both exact and approximate analysis is presented for the queue length and sojourn time in time-limited polling systems with a single server. These exact analytical techniques are extended to multi-server polling systems operating under the pure time-limited service discipline. Such polling systems with multiple servers effectively may reflect large communication networks with multiple simultaneously active links, while the systems with a single server represent performance models for small networks in which a single communication link can be active at a time.
To download the thesis, which I finished in 2009, press: thesis.
|R. de Haan
Centre for Quantitative Methods CQM BV
NL 5600 AK Eindhoven