Carrier-sense multiple access with collision avoidance: Difference between revisions

Revision as of 21:56, 12 October 2006

Revision as of 10:24, 31 October 2006

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CSMA/CA is a modification of pure [[Carrier Sense Multiple Access]] ('''CSMA'''). Collision avoidance is used to improve the performance of '''CSMA''' by attempting to be "less greedy" on the channel. If the channel is sensed busy before transmission then the transmission is deferred for a "random" interval. This reduces the probability of collisions on the channel.

CSMA-CA is used where [[CSMA-CD]] cannot be implemented due to the nature of the channel. CSMA-CA is used in [[802.11]] based [[wireless LAN]]s. InOne aof the problems of [[wireless LAN]],s notis allthat stationsit canis "see"not allpossible otherto stations.listen Hencewhilst sending, therefore collision detection is nonot possible. Another reason is the longerhidden anterminals optionproblem.

==Usage==