Fuzzy approach for QoS aware application driven traffic control in GMPLS networks

Abstract

The ITU-T defined next generation network (NGN) architecture designates the resource admission control function to perform the application-driven Quality of Service (QoS) control across access and core networks. The Generalized Multiprotocol Label Switching (GMPLS) was introduced by the Internet Engineering Task Force (IETF) to cope with new traffic engineering challenges in fast optical networks and provide them with reliable end-to-end QoS mechanisms. However, an actual Connection Admission Control (CAC) implementation inside the resource reservation protocol -traffic engineering extension (RSVP-TE) in GMPLS networks does not provide the ability of effective decision making, since the applied threshold CAC lacks of the capability to consider QoS policies on GMPLS network nodes. This prevents an effective end-to-end QoS control in a fully dynamic, application driven Label Switched Path (LSP) setup scenario. This work presents a specific implementation of fuzzy-CAC operating over an RSVP-TE agent in GMPLS network domain. This fuzzy-CAC implementation is applied to a testbed where a client application requests a real-time data transfer through a GMPLS network, which results in dynamic LSP setup and exclusion. The admission control is performed upon service request based onQoS class requirements and network resource availability. The differentiated traffic treatment on per-flow basis is realized through employment of IF-THEN rule based expert knowledge. Effective traffic differentiation is achieved in a multi-service network scenario and thus it validates fuzzy-CAC as candidate for RSVP-TE protocol enhancement for application driven QoS provisioning in GMPLS networks.

Analysis of effective fuzzy-CAC solution for proactive traffic engineering

“…Fuzzy-CAC solution, which was introduces by authors of the current paper was discussed also in previous publications [9], [10], [11]. In papers mentioned above, one can find extensive description of fuzzy-CAC simulation results, as well as details on practical implementation of Fuzzy-CAC in MPLS-TE network, for effective traffic control.…”

Controle dos efeitos da mistura de quatro ondas (FWM) para melhoria no gerenciamento do QoS óptico em redes GMPLS/DWDM.

“…Assim, os serviços ubíquos oferecem aos usuários o acesso aos recursos embarcados no ambiente utilizando as técnicas da computação móvel. [JELINSKIS, 2010], [SALIBA, 2010].…”

“…Neste plano de controle estão previstas funcionalidades de roteamento e sinalização que possibilitam a unificação e simplificação de uma rede heterogênea [JELINSKIS, 2010], podendo ser mapeado na arquitetura ASON, conforme proposto na RFC 4397 .…”

“…Propor extensões ao plano de controle do GMPLS que possam oferecer às altas demandas de tráfego os sinais ópticos mais adequados, aumentando assim o desempenho das redes, é um desafio hoje enfrentado por diversos grupos de estudos, trabalhando em várias plataformas de Pesquisa e Desenvolvimento [CHAVA, 2010], [JELINSKIS, 2010], [MARTINELLI, 2010], , [SAMBO, 2010], [SAMBO, 2009], [SAMBO, 2009a].…”

“…O GMPLS é formado por um conjunto de protocolos que compõem um plano de controle que é também candidato a compor as redes de nova geração [JELINSKIS, 2010], [TORNATORE, 2009] Importante notar que tanto a proposta do ITU-T (ASON) quanto a do IETF (GMPLS) preveem uma rede de transporte totalmente óptica gerenciada por um plano de controle genérico o suficiente para suportar diferentes tecnologias [ITU, 2006], [MANNIE, 2004].…”