The station ready to transmit, senses the line by using one of the persistent strategies.This is the CSMA protocol with collision avoidance.Shows the flow chart explaining the principle of CSMA/CA. The positive acknowledgment and the time-out timer can help guarantee that receiver has received the frame.Despite all the precautions, collisions may occur and destroy the data.It just stops the timer & restarts it when the channel is sensed as idle. If the station finds the channel busy, it does not restart the process.In contention window the station needs to sense the channel after each time slot.This is very similar to the p-persistent method except that a random outcome defines the number of slots taken by the waiting station.It means that it is set of one slot the first time and then doubles each time the station cannot detect an idle channel after the IFS time. The number of slots in the window changes according to the binary exponential back-off strategy.A station that is ready to send chooses a random number of slots as its wait time.Contention window is an amount of time divided into slots.We’ll be covering the following topics in this tutorial:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |