Protocolli avanzati di rete Modulo 3 -Wireless Network Unità didattica 6 - Protocolli 802.16 Ernesto Damiani Università degli Studi di Milano Lezione 3.

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Presentation transcript:

Protocolli avanzati di rete Modulo 3 -Wireless Network Unità didattica 6 - Protocolli Ernesto Damiani Università degli Studi di Milano Lezione 3 – Livello MAC

Controllo di accesso al mezzo Orientato alla connessione – CID (Connection ID, ID di Connessione, FS (Service Flows, Flussi di Servizi) Accesso al canale – UL-MAP  definisce l’accesso al canale di uplink  definisce i profili dei burst dei dati di uplink – DL-MAP  definisce i profili dei burst dei dati di downlink – UL-MAP e DL-MAP vengono trasmessi entrambi all’inizio di ogni subframe downlink (FDD e TDD)

Subframe downlink TDD

FDD burst framing

Subframe downlink FDD

Subframe uplink

Periodi di uplink Opportunità di manutenzione iniziale – Ranging – Per determinare il ritardo di rete e richiedere cambiamenti di profilo o potenza – In questo intervallo possono verificarsi delle collisioni Opportunità di richiesta – Le SS richiedono larghezza di banda in risposta al polling dal BS – Anche in questo intervallo possono verificarsi delle collisioni Periodo di trasmissione garantita – Le SS trasmettono burst dei dati negli intervalli garantiti dal BS – Gap di transizione tra intervalli di dati per scopi di sincronizzazione FINE