Título:	Novas metodologias AQM e TCP visando a eficiência de fluxos de controle UDP e dados TCP/IP compartilhados
Autor(es):	Sup, Luciano Mauro Arley
Orientador(es):	Moraes, Renato Mariz de
Coorientador(es):	Bauchspiess, Adolfo
Assunto:	Sistema de controle Redes de computação Internet das Coisas (IoT) TCP/IP (Protocolo de rede de computação)
Data de publicação:	27-Fev-2018
Data de defesa:	21-Jul-2017
Referência:	SUP, Luciano Mauro Arley. Novas metodologias AQM e TCP visando a eficiência de fluxos de controle UDP e dados TCP/IP compartilhados. 2017. xvi, 198 f., il. Tese (Doutorado em Engenharia de Sistemas Eletrônicos e Automação)—Universidade de Brasília, Brasília, 2017.
Abstract:	Actually the Internet has become a network capable of interconnecting several types of users, objects, houses, buildings, industrial plants, automobiles, hospitals, schools, this paradigm is known as Internet of Things (IoC). Thus, the Internet has becoming a communication medium that hosts TCP/IP data flows and networked control systems (NCS) UDP flows used in several applications, such as, industrial automation, building automation, remote surgery , smart grid and Smart city. To study both types of flows in a concomitant approach, in this work, a modeling methodology was developed that supports modeling and simulation of communication network topologies along with their protocols and others algorithms using the UPPAAL, a software tool that admit modeling of physical and logical systems through timed automata and make simulations and statistical verifications. Thus, control systems over the Internet were modeled along with other generic flows on which we can observe and study how the communication network features affect control performance behavior for different simulation scenarios and with different AQM (Active Queue Management) techniques implemented in the routers. Then, in order to improve the tradeoff between TCP-throughput and ITAE (Integral Time-weighted Absolute Error) for the NCS that share de same network topology, we've developed a new AQM technique called ENCN (Explicit Non-Congestion Notification) whose performance was compared with TCP-Jersey, DCTCP and, E-DCTCP ECN based transport layer protocols, and with Drop Tail, RED, CoDel, and PIE schemes implemented joint with TCP-Reno protocol (all them modeled in UPPAAL). Simulations and statistical verifications show that the ENCN provides better throughput and fairness for TCP/IP flows, and ITAE for NCS UDP flow compared to other methodologies. However, the ENCN uses some technological resources (bits to notify non-congestion) that are not always available. In order to overcome this ENCN limitation we developed a methodology called ANCE (Acknowledge-Based Non- Congestion Estimation), which work like ENCN but making inferences about queue length instead to using explicit non-congestion notification coming from the routers, which makes this technique more feasible for implementation. Finally, in order to overcome some ANCE limitations we developed a new transport layer protocol called TCP-Puerto-Londero, which rather than using the RTT, makes an adaptive adjustment of the congestion window as a function of a relative delay in the forward path. Simulation results showed that TCP-Puerto- Londero provides performance comparable to ENCN, overcoming TCP-Jersey by 12.03 % and the E-DCTCP in 4.21 % in terms of throughput for TCP/IP flows and reducing the ITAE of the NCS UDP flow by 36.84 %, 36.68 % and 4.16 % in relation to the TCP-Jersey, E-DCTCP, and ENCN, respectively. This good performance of TCP-Puerto-Londero was also observed in the statistical verifications.
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Elétrica (FT ENE)
Informações adicionais:	Tese (doutorado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Elétrica, 2017.
Informações de Acesso e Conteúdo:	Texto parcialmente liberado pelo autor. Conteúdo restrito: Capítulo 5. TCP-Puerto-Londero.
Programa de pós-graduação:	Programa de Pós-Graduação em Engenharia de Sistemas Eletrônicos e de Automação
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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