Ch4_Multiaccess_Communication-2008-3-rev

Ch4_Multiaccess_Communication-2008-3-rev - Multiaccess...

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Multiaccess Communication Sunghyun Choi Adopted from Prof. Saewoong Bahk’s material
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Splitting Algorithms With small attempt rates, most collisions should be between two nodes To resolve collision of two users with each trans. prob. of ½ Throughput becomes 2/3 Split the set of colliding nodes into subsets in order to reduce collision rate = - - = = 2 ) 1 ( 3 2 ] [ k k k N E
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Tree algorithm (Splitting) Assume a collision at the slot. All nodes not involved in the collision go into a waiting mode. All nodes involved in the collision are split into two subsets. The first subset transmits in slot ( k+ 1) If a collision occurs again, repeat the above. If ( k +1) is idle or successful (0 or 1), the second subset transmits in slot ( k +2). th k
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Splitting can be done in various ways Coin flipping, node ID, arrival time Improvements to the tree algorithm, e.g., using the example in the next slide If a collision is followed by an idle slot, split the next subset (i.e., LRR) before transmission
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