Event

On Friday October 23rd at 10:00, Erik Steinmetz, division of Signals and Systems, Chalmers, will give his licentiate seminar.

Title: Reliability of Packet Transmissions in Vehicular Networks

Discussion Leader: Professor Fredrik Tufvesson, Department of Electrical and Information Technology, Lund University.

Location: Room EF, Hörsalsvägen 11, Campus Johanneberg.

Abstract: The current road transport system has large problems with safety and efficiency, and these problems do not only cost the society enormous amounts of money and affect the everyday life of people, but might in the long run also have devastating consequences for the environment and the global climate.

Future intelligent transportation systems, where vehicular communication systems play a key role, are envisioned to alleviate these problems and allow for a safer and more efficient coordination of vehicles. In particular, wireless communication is expected to increase the situational awareness in complex and accident-prone scenarios such as intersections, where the ability to coordinate the traffic flow otherwise would be limited by the range and quality of each vehicle's on-board sensors. However, by relying on wireless communication another form of uncertainty is introduced as the information exchange between nodes suffer from both packet drops and random latencies. This means that before deploying such systems we need to fully understand and be able to handle these uncertainties.
 
This thesis focuses on reliability of packet transmissions in vehicular networks and the main goal is to better understand the performance of vehicular communication systems in different scenarios typical for the vehicular environment, both to gain insights on how to design better communication systems and to understand what uncertainties a control system might have to deal with. The overview part of the thesis provides some background on vehicular communication systems and stochastic geometry which can be used to quantify the impact of interference and derive analytical key performance metrics for this type of networks. In the appended papers we present a general procedure to analytically determine the reliability of packet transmissions for a selected link as well as system wide throughput in intersections. We provide a model repository that can be used to model different MAC protocols, as well as different propagation conditions typical to both urban and rural environments, and the generality and flexibility of the model makes it applicable to both 5G D2D and IEEE 802.11p communication. Furthermore, we study a centralized intersection crossing coordination scenario where vehicles approaching the intersection communicate with a central coordinator. We show how tools from stochastic geometry can be used to analyze the communication performance in this scenario and provide design guidelines that guarantees a certain communication performance (i.e., QoS) while minimizing the use of system resources. This type of results can for example be used to study how far away from the intersection a centralized controller can expect to have information available from all vehicles given certain communication parameters, QoS requirements, vehicle densities and velocities.

Keywords: Vehicular Communication, Reception Probability, Stochastic Geometry.

Welcome!