Traffic and Service Characterization

Roberto Bifulco — Fri, 01/25/2008 - 10:02

Si possono adoperare due informazioni per quantificare in termini di risorse un servizio:

Il tipo di traffico da trattare;
Il servizio fornito dal router, ad esempio in termini di risorse riservate in ciascun router.

Per controllare il traffico inviato alla rete, e per renderlo conforme ad un modello noto, è possibile caratterizzarne l'andamento nei terminali di accesso alla rete. In altre parole, qualsiasi client acceda alla rete, lo fa attraverso una sorta di filtro, che adatta il traffico generato ad un modello specifico.

Questo approccio è necessario poiché il traffico dati non ha un andamento prevedibile come quello telefonico.

In Figure 2 sono rappresentati i modelli di traffico telefonico e dati, dove si vede chiaramente che l'andamento è ben diverso. Questo è dovuto anche al fatto che il traffico dati è self-similar, in altre parole, quando si sommano più flussi dati, la curva di traffico mantiene la stessa forma.

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