Ch4_Multiaccess_Communication-2008-1

Ch4_Multiaccess_Communication-2008-1 - Multiaccess...

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Unformatted text preview: Multiaccess Communication Sunghyun Choi Adopted from Prof. Saewoong Bahks material Channel Allocation Problem In any broadcast network, the key issue is how to determine who gets to use the channel MAC: medium access control Between the data link layer and the physical layer Allocates the multi-access medium among the competing nodes(hosts) Channel allocation Free for all or perfectly scheduled approach Multi-access channels Satellite channels Multidrop telephone lines Multitapped bus Packet radio networks Idealized Slotted Multiaccess Model m transmitting nodes and one receiver Slotted system Perfect synchronization and same packet length Poisson arrivals with rate / m individually Collision or perfect reception no channel error or capture effect 0, 1, e(rror) and immediate feedback Retransmission of collisions Backlogged node is with a packet to be retransmitted Either of the following two assumptions No buffering : packet arriving at active node is simply discarded Infinite set of nodes ( m = ): packet always arrives at a new node Slotted ALOHA...
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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-2008-1 - Multiaccess...

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