Arq Protocols

ARQ Protocols

Prof. Anish Goel

Automatic Repeat Request (ARQ)

ARQ Protocols Anish Goel

Stop-and-Wait ARQ

S&W ARQ - Sequence Numbers

S&W ARQ - Sequence Numbers in ACK

1-Bit Sequence Numbering suffices for Stop-and-Wait ARQ

Stop-and-Wait ARQ

Applications of Stop-and-Wait ARQ

Stop-and-Wait Efficiency

Stop-and-Wait Model

Stop & Wait Efficiency on Error-free channel

Example: Impact of Delay-Bandwidth Product on Transmission Efficiency

Stop and Wait Efficiency in Channel with Errors

Example: Impact of Bit Error Rate on Transmission Efficiency

Go-Back-N (GBN)

Go-Back-N ARQ

S&W timeout and GBN window size long enough to cover round trip time

Go-Back-N with Timeout

Go-Back-N Transmitter & Receiver

Sliding Window Operation

Maximum Allowable Window Size is Ws = 2m-1

ACK Piggybacking in Bidirectional GBN

Required Timeout & Window Size for Bidirectional GBN

Applications of Go-Back-N ARQ

Required Window Size for Delay-Bandwidth

Efficiency of Go-Back-N

Example: Impact of Bit Error Rate on GBN

Selective Repeat ARQ

Send & Receive Windows

What size Ws and Wr allowed?

Ws + Wr = 2m is maximum allowed

Why Ws + Wr = 2m works

Applications of Selective Repeat ARQ

Efficiency of Selective Repeat

Example: Impact of Bit Error Rate on Selective Repeat

Comparison of ARQ Efficiencies

ARQ Efficiencies

Arq Protocols

Education

Transcript of Arq Protocols

Arq Peninsula

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arq. vernácula

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Hybrid ARQ

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Data Link Control and Protocols - :: SUT Student Web Portalpersonal.sut.ac.th/paramate/files/compcom/lecture09a.pdfOperations การท างานของ Stop−and−Wait ARQ

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Par4 ARQ - University of Hong Kongsdma/elec7073_2008/Part4 ARQ Updated.pdf · GBN-ARQ Pure ARQ Protocols----go back N (GBN-ARQ) — Transmitter: send packets continuously, respond

Guru Nanak Dev Engineering College, Ludhiana Department of ... · protocols-Stop and Wait, Go back–N ARQ, Selective Repeat ARQ, Sliding Window, Piggybacking, Random Access, Multiple

Cross-layer Arq Protocols Single vs Multiuser

ARQ Attack