A 3-layered self-reconfigurable generic model for self-diagnosis of telecommunication networks

Serge Romaric Tembo Mouafo (1, 2, 3, 4) , Jean-Luc Courant (4) , Sandrine Vaton (1, 2, 3)

1 ADOPNET - Advanced technologies for operated networks
2 INFO - Département informatique
3 IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires
4 Orange Labs [Lannion]

The dynamic and distributed nature of telecommunication networks makes complex the design of model-based approaches for network fault diagnosis. Most model-based approaches assume the prior existence of the model which is reduced to a static image of the network. Such models become rapidly obsolete when the network changes. We propose in this paper a 3-layered self-reconfigurable generic model of fault diagnosis in telecommunication networks. The Layer 1 of the model is an undirected graph which models the network topology. Network behavior, also called fault propagation, is modeled in Layer 2 using a set of directed acyclic graphs interconnected via the Layer 1. We handle uncertainties of fault propagation by quantifying strengths of dependencies between Layer 2 nodes with conditional probability distributions estimated from network generated data. Layer 3 is the junction tree representation of the loopy obtained Layer 2 Bayesian networks. The junction tree is the diagnosis computational layer since exact inference algorithms fail on loopy bayesian networks. This generic model embeds intelligent self-reconfiguration capabilities in order to track some changes in network topology and network behavior. These self-reconfiguration capabilities are highlighted through some example scenarios that we describe. We apply this 3-layered generic model to carry out active self-diagnosis of the GPON-FTTH access network.We present and analyze some experimental diagnosis results carried out by running a Python implementation of the generic model.

Mots clés: Self-diagnosis; Self-reconfiguration; Fault propagation; Bayesian networks; Probabilistic inference; GPON; FTTH

Domaines: Réseaux et télécommunications [cs.NI]; Applications [stat.AP]

Serge Romaric Tembo Mouafo, Jean-Luc Courant, Sandrine Vaton. A 3-layered self-reconfigurable generic model for self-diagnosis of telecommunication networks. IntelliSys 2015 : SAI Intelligent Systems Conference, Nov 2015, London, United Kingdom. pp.25 - 34, ⟨10.1109/IntelliSys.2015.7361080⟩. ⟨hal-01250445⟩