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University: Linköping University Department: Science and Technology (ITN) Professor: Di Yuan
Wireless LANs Planning and Optimisation
Participants: Iana Siomina, Di Yuan
The research focuses on models and algorithms for optimizing Wireless LANs (WLANs) deployment. WLAN is one of the most important technologies at the moment for wireless broadband access. We aim at making the network planning process more efficient and to improve the performance of deployed networks.
The work focuses on access points placement, frequency assignment, and downlink transmit power levels assignment, applying the know-how we have with other technologies. The first task is the proper modelling of network infrastructure, traffic, propagation, and interference. Our network optimisation approach is based on integer programming techniques. Our goal is to develop efficient algorithms that allow for reducing the network deployment cost as well as increasing the network capacity and balancing the load of neighbouring access points for a given traffic distribution. Another issue that we would like to study is dynamic load balancing mechanisms that allow the network to adapt to changing conditions and to maintain a given level of QoS.
Energy-Efficient Ad Hoc Networking
Participants: Iana Siomina, Di Yuan
Ad hoc networks refer to the type of communication platform, in which devices set up a wireless networking environment in an ad-hoc fashion. An ad hoc network does not use any pre-installed, permanent infrastructure. Ad hoc networking is a promising (and sometimes, the only feasible) architecture for several network applications, ranging from peer-to-peer personal communications, emergency networks, disaster relief networks, sensor networks, to military command and control systems.
The amounts of power available to devices are often very limited in ad hoc networks. Therefore, energy-efficiency is a crucial issue when designing networking protocols and algorithms. Challenges for rational design of ad hoc network that are related to energy-efficiency include topology management and routing. This project involves the study of problem complexity and algorithm complexity, as well as the development of integer programming models and methods for power-efficient design of ad hoc networks. Our study also includes the development of energy-optimization algorithms suitable for distributed implementations.
Utilising UMTS Signaling Data for Vehicle Tracking
Participants: David Gundlegård
The purpose of the simulation project is to analyze how UMTS terminals in connected state can be tracked by using signaling data available in the radio access network. The information will in the next step be used for travel-time estimations on a road network. The results will be compared with similar algorithms for the GSM network.