03 out 2024
09:00 Doctoral defense Unicamp Computing Institute Auditorium
Theme
Dynamic Network Slicing for Mobile Users in 5G Networks
Student
Diogo Machado Gonçalves
Advisor / Teacher
Edmundo Roberto Mauro Madeira - Co-supervisor: Luiz Fernando Bittencourt
Brief summary
Network Slicing has proven to be one of the key pieces for managing the resources of modern network infrastructures such as 5G. From the virtualization of the network's physical resources, several Virtual Networks (Network Slices) can be created on the same infrastructure in order to serve, on a tailored basis, different groups of users. These users, in turn, access, through Virtual Networks, services and applications present in the infrastructure. In addition to the storage, processing and network requirements (e.g. latency, bandwidth and reliability) intrinsic to each application, user characteristics, such as mobility, add complexity to this scenario. In this context, not only the applications accessed by users must be allocated in strategic locations, but also Virtual Networks must be built in order to provide the necessary connection between these agents. Given the dynamicity of this scenario, the network infrastructure must be able to reconfigure itself efficiently as the demand for resources changes over time. This doctoral thesis aims to present new solutions to the Problem of Dynamic Allocation of Virtual Networks with the aim of serving Mobile Users in a Mist/5G infrastructure. In particular, this work developed solutions for two optimization problems related to the dynamic allocation of resources present in this architecture: the reconfiguration of Virtual Networks and the Migration of Services. The contribution of this work includes: 1) A simulator developed to allow validation of the proposed solutions; 2) An assessment of the behavior of virtual networks in the face of the dynamic demand caused by mobile users; 3) A mathematical model that calculates the cost, measured in time, for allocating and reconfiguring a virtual network; 4) A heuristic solution to optimize the process of reconfiguring virtual networks. The developed simulator is available as free software. The studies carried out indicate that the dynamic reallocation of resources in virtual networks is a solution for the network infrastructure to adapt to variations in demand caused by mobile users. However, the frequency with which the infrastructure is capable of performing such reconfigurations is crucial to the success of such a solution. It should be noted that reconfigurations that required 60 seconds or more to complete their operation affected the frequency, and consequently, the effectiveness of the reconfigurations in the evaluated scenarios.
Examination Board
Headlines:
| Edmundo Roberto Mauro Madeira | IC / UNICAMP |
| Alfredo Goldman vel Lejbman | IME / USP |
| Magnos Martinello | CT/UFES |
| Rafael Pasquini | CETEC/UFU |
| Carlos Alberto Astudillo Trujillo | IC / UNICAMP |
Substitutes:
| Fabio Luciano Verdi | DComp / UFSCar |
| Allan Mariano de Souza | IC / UNICAMP |
| Helder May Nunes da Silva Oliveira | CECS / UFABC |
| Islene Calciolari Garcia | ICMC / USP |