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Analyse et optimisation d'une nouvelle architecture de réseau optique futuriste

Abstract : The demand for network throughput is increasing due to the continued growth of global traffic and the emergence of new services with ever higher requirements. In this context, the capacity of the network should be increased while taking into account the energy consumption, its cost of construction and maintenance. The combination of optical networks with packet-oriented processing could meet these requirements. However, because of the lack of all practical optical memory, packet switching is most often performed electrically causing the architecture to be costly expensive and less efficient.Thereby, as part of the ANR / N-GREEN project, a new switch/router architecture that provides solutions to these constraints has been proposed by a research team at Nokia Bell Labs. The architecture was designed to meet the stringent requirements of 5G such as end-to-end delay of 10μs but also to meet the traffic increase planned especially in the Metropolitan Area Network (MAN). Such architecture can therefore be used not only in the access/core part of the MAN but also in the core as well as in the Xhaul consider the 5G technology . In this dissertation, we have been interested in analyzing and improving the performance of this new node design when it is used in the MAN part.Indeed, taking this into consideration, an Optical Slot Switching (OSS) ring network, combining the flexibility and scaling of slot switching technique with the advantages of ring topology such as fast service restoration in case of failure and a good gain in static multiplexing of traffic, would promise a good solution for MAN networks of the future. This new architecture offers intelligent functions, with a lower cost by optimizing the type / number of components used. Such an architecture can replace existing optoelectronic technology such as Ethernet or other promising solution proposed in the literature such as POADM (Optical Package Add Drop Muliplexing) or TWIIN (Time-Domain Wavelength Interleaved Networking (TWIN). The fundamental element of the network is the WSADM (Wavelength Slotted Add Drop Muliptexer) which is implemented inside the nodes of the networks, guaranteeing hence the optical transparency and a faster switching.In this thesis, we analyzed the performance in terms of mean access delay and resource efficiency of a ring network composed of a number of NGREEN nodes. We have used some optimization methods such as Nelader Mead Simplex calculating dynamically the optimal values of the timers (average waiting time of a packet before being inserted in the optical ring), adapting thus the architecture to different types of traffic. Three different models of traffics were considered in this study: besides the most well-known Poisson model, two models based on traces of real traffic deduced from CAIDA traces were considered.Inspired by the idea of the loop controllers, we tried later to find a way to self-adapt the network facing constant changes in traffic. As we talk about a constant adaptation of the strategy in noisy conditions, we proposed a very variable traffic model, more variable than the one drawn from CAIDA trace. Observing the effect of the changing frequency of one of the coefficients that govern the strategy of packets ‘transmission on the momentary performance of the network; allowed to find a frequency range, where an instantaneous dependency between the stimulus and the response direct a self-adaptation scheme of the proposed strategyThe performance analysis of this architecture, taking into account different traffic models, shows that, thanks to the methods proposed and the application of optimization, the network responds to users' needs in terms of packet loss rates, latency.
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Amira Kamli. Analyse et optimisation d'une nouvelle architecture de réseau optique futuriste. Réseaux et télécommunications [cs.NI]. Institut Polytechnique de Paris, 2019. Français. ⟨NNT : 2019IPPAS001⟩. ⟨tel-02469703⟩

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