Banca de DEFESA: HUGO LEONARDO MELO DOS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE: HUGO LEONARDO MELO DOS SANTOS
DATA: 29/05/2023
HORA: 09:00
LOCAL: Sala de Aula 01 - CEAMAZON
TÍTULO:

Multimedia Service Orchestration in Multi-tier Edge Computing Environments

PALAVRAS-CHAVES:

Fog computing, floating service, service management

PÁGINAS: 73
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Ciência da Computação
SUBÁREA: Sistemas de Computação
ESPECIALIDADE: Teleinformática
RESUMO:

High Definition Video on Demand (VoD) and immersive multimedia services,
such as Virtual Reality (VR) and Augmented Reality (AR), continuously enhance multimedia visual quality and leads to an exponential usage growth of computational resources of processing, networking, and storage. Low-latency multimedia services rely on heterogeneous multi-tier edge computing datacenters to provide computational resources close to consumers, improving user-perceived Quality of Experience (QoE) and avoiding degraded network Quality of Service (QoS). Multimedia services are composed of specialized functions embedded into a monolithic service or decomposed into Service Function (SF) chains of ordered microservices inter-connected with high-speed network links. Monolithic and SF chains deployed at the network edges can reduce delay and improve the use of computational resources. In this context, multi-tier edge nodes can host services according to consumers’ and providers’ best interests. QoE, QoS, mobility, and multiple criteria are important in instantiating, re-instantiating, and terminating services in multi-tier edge
computing. Service orchestration controls and manages service requests and chooses edge nodes to execute services fulfilling requirements guarantees and efficiently using computational resources. The orchestrator can be configured to consider service aspects, such as QoE, QoS, fairness, computational edge node constraints, energy, and mobility. There are several issues of providing efficient service orchestration for multimedia in multi-tier edge computing environments, including (i) service orchestration in diverse changing network conditions intended to improve the user-perceived experience and QoS; (ii) mobile users assistance by energy-constrained mobile and static edge nodes in temporary and poor connectivity conditions; and (iii) mobility support in real-time for immersive multimedia SF chaining orchestration to mobile users in urban scenarios.
This thesis contributes to efficiently meeting future VoD, VR, and AR services needs in multi-tier edge computing. The first contribution lies in choosing an appropriate edge node to stream VoD, considering QoE, QoS, and cost to instantiate VoD services. The second lies in selecting and placing flying edge nodes to assist poorly-served users regarding QoS, considering distance, energy, and service priority. The third lies in mobility-aware Service Function Chaining (SFC) orchestration by mapping, instantiating, and re-instantiating SFs into multiple edge nodes considering QoS. The proposed solutions were widely compared to related works on different scenarios. The results show that the proposed schemes outperform the state-of-the-art.

MEMBROS DA BANCA:
Presidente - 1700540 - EDUARDO COELHO CERQUEIRA
Interno - 2244893 - DENIS LIMA DO ROSÁRIO
Interno - 1768614 - MARCOS CESAR DA ROCHA SERUFFO
Externo à Instituição - ANTONIO ALFREDO FERREIRA LOUREIRO
Externo à Instituição - TORSTEN INGO BRAUN