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Investigating the Influence of Vehicular Mobility on Contention Resolution Diversity Slotted Aloha (CRDSA) in Hybrid Vehicular and LEO Satellite Networks
MA: Master's Thesis (or Diploma Thesis / Diplomarbeit)
In order to provide low-latency high-throughput Internet access all over the world, companies like SpaceX, Amazon, and OneWeb currently deploy and maintain Low Earth Orbit (LEO) satellite constellations. Thousands of small satellites orbit Earth at an altitude of roughly 500km. Such a system is perfect for supporting vehicular networks by means of providing Internet access even in regions in which cellular communication technologies like LTE or 5G are not available. For evaluating LEO satellite supported vehicular networks, the simulator Space_Veins is currently developed by us [1]. It integrates LEO satellites in a Veins simulation to simulate Space-Air-Ground Integrated Networks.
Goals of the thesis
Since multiple vehicles may want to communicate with a single LEO satellite at the same time, a medium access control protocol is required to minimize packet collisions at the LEO satellite. A suitable protocol is Contention Resolution Diversity Slotted Aloha (CRDSA) [2]. The goal of the thesis is investigating if the mobility of vehicles influences the performance of CRDSA.
Basically, the following steps need to be performed:
- Get familiar with the existing implementation
- Implement CRDSA
- Conduct a simulation study comparing the Packet Delivery Ratio (PDR) of static vehicles and moving vehicles
Keywords
C++, Network Simulation, Vehicular Networking, LEO Satellite Constellation, Space-Air-Ground Integrated Networks
Literature
[1] Mario Franke and Christoph Sommer, “Toward Space-Air-Ground Integrated Network Simulation with 4D Topologies,” Proceedings of 19th IEEE/IFIP Conference on Wireless On demand Network Systems and Services (WONS 2024), Chamonix, France, January 2024. https://www.cms-labs.org/bib/franke2023toward/
[2] E. Casini, R. De Gaudenzi and O. Del Rio Herrero, “Contention Resolution Diversity Slotted ALOHA (CRDSA): An Enhanced Random Access Scheme for Satellite Access Packet Networks,” IEEE Transactions on Wireless Communications, vol. 6, no. 4, pp. 1408-1419, April 2007, doi: 10.1109/TWC.2007.348337