Ch4_Multiaccess_Communication-2008-4-rev

Ch4_Multiaccess_Communication-2008-4-rev - Multiaccess...

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Unformatted text preview: Multiaccess Communication Sunghyun Choi Adopted from Prof. Saewoong Bahks material CSMA Protocol ignore the detection delay, synchronization delay for the reception. detect idle periods quickly : the propagation and detection delay (in packet trans. units) required for all sources to detect idle after a transmission ends. where C: channel rate, : end to end prop. Delay, L: expected packet length CSMA: Carrier Sense Multiple Access L C = If the channel is idle for , a new slot begins again. Assume infinite set of nodes and Poisson arrivals of overall intensity. CSMA types non-persistent persistent (transmit new packet with prob.=1 when idle) p-persistent (transmit new packet with prob.=p when idle) Non-persistent CSMA (slotted) Idle slots have a duration of . A packet arriving in an idle slot is transmitted in the subsequent slot A packet arriving in a busy slot is regarded backlogged * The backlogged nodes send the frame with the prob. of when idle....
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This note was uploaded on 06/16/2008 for the course COMPUTER S 853 taught by Professor Choi during the Spring '08 term at Seoul National.

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Ch4_Multiaccess_Communication-2008-4-rev - Multiaccess...

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