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Upravljanje prometnim tokovima i postupci retransmisije paketa

Upravljanje prometnim tokovima i postupci retransmisije paketa. Prijenos podataka Prof.dr.sc. Alen Bažant. Flow Control. FC (2). FC (3). Retransmisija okvira. Predajnik nakon slanja pokreće brojač. Problem: paketi s pogreškom i dvostruki paketi. ARQ - ABP. ARQ – ABP (II).

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Upravljanje prometnim tokovima i postupci retransmisije paketa

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  1. Upravljanje prometnim tokovima ipostupci retransmisije paketa Prijenos podataka Prof.dr.sc. Alen Bažant

  2. FlowControl

  3. FC (2)

  4. FC (3)

  5. Retransmisija okvira Predajnik nakon slanja pokreće brojač Problem: paketi s pogreškom i dvostruki paketi

  6. ARQ - ABP

  7. ARQ – ABP (II) Predajnik mora numerirati pakete

  8. ARQ – ABP (III) Prijemnik mora numerirati potvrde

  9. ARQ – GoBack N Koristi se prozor duljine N. Paketi se numeriraju modulo N+1. N = 4 Ako prijemnik primi pakete 1, 2, 4, 5 šalje potvrde 1, 2, 2, 2 Prije nego pošalje paket n + N predajnik čeka potvrdu prijema paketa n Predajnik mora spremiti do N paketa

  10. ARQ – SelectiveRepeatPrtotocol Predajnik i prijemnik moraju biti u mogućnosti spremiti do N paketa Veličina prozora = 2N Paketi i potvrde se numeriraju modulo 2N Predajnik čeka potvrdu paketa n prije nego pošalje paket n + N (modulo 2N)

  11. Usporedba tehnika ARQ-a

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