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lec8 - UCI University of California Irvine EECS 161...

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EECS 161 - Introduction to Computer Networking Scott Jordan Local Area Networks / Ethernet UCI University of California, Irvine CSMA-CD protocol: (1) Wait until channel is idle. (2) Transmit & listen. (3) If collision, stop transmitting packet, transmit "jam signal", wait random delay, and go to step (1).
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EECS 161 - Introduction to Computer Networking Scott Jordan Local Area Networks / Ethernet UCI University of California, Irvine CSMA-CD protocol: (1) Wait until channel is idle. (2) Transmit & listen. (3) If collision, stop transmitting packet, transmit "jam signal", wait random delay, and go to step (1). Random delay: Let 1 "slot" = 512 bit times Upon 1 st collision, randomly choose among {0,1} slot delay. Upon 2 nd collision, randomly choose among {0,1,2,3} slot delay. ... Upon m th collision, randomly choose among {0,1,...,2 m -1} slot delay. ... Upon 10 th -15 th collision, randomly choose among {0,1,...,1023} slot delay. Gives up at 16 th collision. "binary Exponential backoff" This slows down the retransmission rate as congestion increases, and tries to avoid the undesirable equilibrium point in the ALOHA throughput curve.
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