Associate Professor Bjorn Landfeldt, Ph.D. I currently work in the School of Information Technologies , at the University of Sydney To find out more about me, follow the relevant links to the right. I am also a NICTA Senior Researcher. Contact Details: Phone: +61 2 9351 8962 email: bjornlATit.usyd.edu.au Current Projects Avoiding interference and maximising capacity in collaborative access networks In this project we investigate ways of overcoming the problems asociated with wireless access points overlapping in coverage and contending for resources in densly deplyed areas. It has been shown that the performance of WLAN (802.11) suffers greatly when there are many acess points contending for resources. We are working on alleviating this problem using collaborative algorithmic techniques. PhD student - Suparerk Manitpornsut. Mobility Management in unstructured wireless networks Traditional wireless networks can be viewed as hierarchical constructs and it is easy to determine the apropriate locations of mobility anchorpoints and gateways in such neteorks. In unplanned and unstructured networks however, this does not hold true. Such networks (e.g. wireless mesh networks) have unstructured connectivity graphs which makes the optimum location of anchorpoints difficult to determine. PhD student working on topic - Paul Wu. Effects of inaccuracy of location estimation on DSRC based services DSRC based vehicular services include road safety applications such as collision avoidance. These application rely on accurate sensor data input in order to function well. In this project we are investigate achieveable accuracy of sensed data trough sensor fusion and data filtering and determine the flow on effects on application peformance. PhD student - Quincy Tse Old projects Device Auto-configuration This project is looking at translations of resource reservations between different access networks as mobile nodes move between accesses. The project has two parts ,mapping/admission control and modeling of queuing systems under self-similar traffic input.  A function based communication stack This project looks at decoupling individual functions in the communication stack instead of bundling them into static protocols. The major advantage is that using only the components necessary to support a given service, the stack implementation can be optimised. This is useful for saving complexity and power usage in sensor nodes etc. Power aware routing for sensor networks This project aims at developing methods for maximising network lifespan by equalising power in routing nodes. If critical nodes fall off the network, entire sub trees can become unavailable. Therefore, equalisation will maximise network lifespan rather than individual node lifespan. Presence and notifications in infrastructure-less environments This project aims at providing presence, location and notification services in networks where known addresses for servers etc. are unavailable. Networks such as ad-hoc networks inherently have the problem that resources are at best difficult to locate so that traditional server based approaches fail. Load balancing of asymmetric access channels with asymmetric traffic It is well known that asymmery is an important factor to consider when balancing load over communication networks. In this project, we investigate an additional dimension, asymmetric traffic mapping onto asymmetric access links to achieve maximum network utilisation. Optimised Location Management This project aims at minimising the cost associated with maintaining knowledge about mobile hosts in cellular networks (or extrapolations thereof). Currently, there has been a strong focus on dynamically determining optimal location areas/paging areas to improve on the pretty inefficient static model current cellular networks use. In this work we take this work further by optimising the cost on an individual basis rather than the network aggregate for all hosts. An optimized PCF for QoS in IEEE 802.11 In this project we are investigating different methods of improving the QoS provisioning in IEEE 802.11. We are trying to maximise the number of supported terminals with QoS sensitive traffic while improving the service differentiation.	Teaching Research and Publications SCUBA Diving Dive Blog My leisure tool	Current research students PhD Suparerk Manitpornsut Paul Wu Quincy Tse Rezwan Khan Emma Fitzgerald Alumni Mohsin Iftikhar (PhD 2008) Dan Cutting (PhD 2008) Khaled Matrouk (PhD 2008) Kaushalya Premadasa (PhD 2007) Apichan Kanjanavapastit (PhD 2005) Sanchai Rattananon (PhD 2005) James Cowling (University Medalist, won the Soprano Prize for best Thesis in 2004, Fullbright Scholar, Allan Bromley prize for best honours thesis in University of Sydney and the University of Sydney medal of Convocation) Florian Vehrein (University Medalist, the best EIE thesis 2004, Co-supervised with Dr. Sanjay Chawla) Natalie Kolodziej (Honours, won the Singtel prize for best Telecoms project in 2003) Ezequiel Muns (Hons 1) Yuri Tselishchev (Hons 1) T. J. Singh (Hons 1) now with Microsoft Redmont David Helstroom (Hons 1) now with Google Mountainview Future Projects I am always interested in working with good students. However, I am a busy person and have limited time to spare. Before you send me your CV, please read the future student requirements. If you don't meet these requirements, I am not able to supervise.