engleski

Modelling and Performance Analysis of Multi-Service Photonic Network

The objective of the thesis was to analyze the possibilities to guarantee the quality of service on the photonic layer with the assumption of the dynamic service provisioning and tear-down requests. A set of network and communication models and simulation and analytical methods has been proposed. A network operator can use this set of methods to evaluate the possibility to satisfy clients' QoS requests depending on the network features and current network communication. This process aims towards the automatization of the SLA as these performance evaluation procedures can be implemented as a part of the network management and control. The analysis has been conducted on the multi-service photonic network model (MSPN), which assumes the coexistence of optical circuit (OCS), burst (OBS) and packet switching (OPS) controlled by the common IP-photonic GMPLS control plane. The quality of service offered by the MSPN depends on the functionality implemented in the network, network and node design, network dimensioning and employed resilience mechanisms. The thesis proposes an MSPN network and node structure, and analyzes optical components required to enable MSPN functionality. The network comprises IPPoP nodes implementing the client (IP) network functionality and WDMPoP nodes implementing the photonic network functionality. A special attention has been given to the modelling the of the client interface between the MSPN and its clients. The thesis proposes several network dimensioning procedures classified according to the implemented switching capabilities in the nodes and possible performance constraints imposed in the network. The network dimensioning for the isolated OCS and OPS traffic has been analyzed, as well as the dimensioning in the hybrid case with the traffic classified between the switching mechanisms. The OPS dimensioning can be performed with the packet/cell loss ratio constraint. Network resilience mechanisms, based on the photonic protection and restoration techniques, have been analyzed from the design and the dimensioning point of view. The clients of the MSPN network have been modelled as a chain of operators requiring services from the optical transmission network operator. Other operators, like the access network operator, require a horizontal SLA from the MSPN. Network providers enable the IP service on top of the transmission services offered by the operators. These providers, being access and broadband network providers, require a vertical SLA from the MSPN or some other operator. The service level agreement automatization depends on the evaluation of the performances that can be achieved if a communication supporting a requested service is provisioned. The thesis proposes a packet loss ratio, delay and availability performance evaluation using analytical and simulation approaches. The packet/cell loss ratio models have been applied to the MSPN model, while the network availability model has been proposed and applied to the proposed transport entity hierarchy.

Multi-service photonic network; network modelling; network dimensioning; network resilience; dynamic service provisioning; quality of service; service level agreement; performance analysis; simulation

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