Name: Rafael Silva Guimarães
Type: PhD thesis
Publication date: 28/05/2021

Namesort descending Role
Magnos Martinello Advisor *

Examining board:

Namesort descending Role
Charalampos Rotsos External Examiner *
Daniel Kilper External Examiner *
Leobino Nascimento Sampaio External Examiner *
Magnos Martinello Advisor *
Vinicius Fernandes Soares Mota Internal Examiner *

Summary: Orchestration can be viewed as an inter-working technology-agnostic glue thatdecouples, understands, supports, and provides end-to-end communication based ona unified optical-wireless-packet-cloud view. Software-defined network (SDN) andnetwork function virtualization(NFV) bring, as enablers, new networking paradigmsin which promise to improve flexibility and programmability by centralized control.However, the architecture of next-generation networks has to deal with heteroge-neous resources that generally sit across separate domains: time, frequency, andspace in wireless technologies; optical fibers, optical wavelengths, and ports in wiredenvironments; placement and computing resources in the cloud infrastructures. Thisdisruptive re-engineering of the network architectures has already brought keyfeatures like network slicing (i.e., sharing the same infrastructure through differentservice requirements), enabling the operators to deliver tailored and customizedconnectivity and services for each slice. Therefore, this work contributes by ex-tending SDN and NFV paradigms introducing cross-layer network programmabilitythat allows a fine-grained control and management for supporting an expressiveorchestration across heterogeneous resources.Besides the functional extensions on SDN and NFV paradigms, the orchestrationprocess needs to perform accordingly to meet the new critical applications’ reconfig-urability dynamics, such as demand ultra-reliable and low-latency communications.For instance, to ensure handover, a programmability model is required to enable thejoint control of wireless, wired, and cloud catching up with user mobility, communi-cation channel degradation, and outages. As a result, the orchestration must selectquickly among possible paths in the underlay network. This led us to claim that theorchestration process must be underpinned in a novel routing proposal to meet fastand expressive capabilities in setting up end-to-end connectivity.The thesis introduces a novel routing proposal by exploring the Residue NumberSystem’s properties (RNS) that reduce the management burden of building up dis-tributed routing tables, in contrast to traditionally table-based approaches that haveto maintain and rely on table lookup operations. A source routing multicast approachbased on polynomials (M-PolKA) is created, developed, deployed, and evaluated toallow agile path reconfiguration. M-PolKA expressiveness is demonstrated by en-abling new functionality such as data duplication, redundant transmission/receptionfrom multiple cells to deliver diversity that increases communication reliability.Keywords:Next-Generation Networks, Network Functions Virtualization, Software-Defined Networking, Service Function Chaining, Edge computing, 5G paradigm,Source Routing, WiFi, Residue Number System.

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