Lecture%20slides%202007%2003%2029

Lecture%20slides%202007%2003%2029 - remain in buffer A B t...

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Chapter 5 Peer-to-Peer Protocols and Data Link Layer Flow Control
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Flow Control z Receiver has limited buffering to store arriving frames z Several situations cause buffer overflow z Mismatch between sending rate & rate at which user can retrieve data z Surges in frame arrivals z Flow control prevents buffer overflow by regulating rate at which source is allowed to send information Information frame Control frame Transmitter Receiver buffer fill
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on off off on A B 2 T prop Time Time X ON / X OFF Transmit Transmit Information frame X OFF Transmitter Receiver threshold Threshold must activate OFF signal while 2 T prop R bits still
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Unformatted text preview: remain in buffer A B t cycle Return of permits Time Time Window Flow Control z Sliding Window ARQ method with W s equal to buffer available z Transmitter can never send more than W s frames z ACKs that slide window forward can be viewed as permits to transmit more z Can also pace ACKs as shown above z Return permits (ACKs) at end of cycle regulates transmission rate z Problems using sliding window for both error & flow control z Choice of window size z Interplay between transmission rate & retransmissions z TCP separates error & flow control...
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This note was uploaded on 10/09/2009 for the course ENSC 1156 taught by Professor Rhardy during the Spring '07 term at Simon Fraser.

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Lecture%20slides%202007%2003%2029 - remain in buffer A B t...

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