DIFFERENCE BETWEEN PURE ALOHA AND SLOTTED ALOHA PDF

Before you go through this article, make sure that you have gone through the previous article on Access Control. The main advantage of slotted aloha is that it reduces the number of collisions to half and doubles the efficiency of pure aloha. Each station output a bits frame on an average of ms even if previous one has not been sent. What is the required value of N?

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In the system of network protocols, the purpose of both pure ALOHA and slotted ALOHA is the same that is to determine the competing station must get the next chance of accessing the multi-access channel. And that is done on the MAC layer that is the medium access control layer. This time slot corresponds to the length of frames.

It allows each frame to be achieved with the help of special frames. There is a possibility of the collision of data frames so when every station transmits the data without checking whether the channel is free or not. If the frame is free then it is ok to get the frame for the transmission of data whereas if there is no free frame, then data collide. This collision cause frame overloading and the frame are destroyed.

When the frame has damaged the stations, have to wait for the random amount of type, and when the frame is free, the transmission is done successfully. There is a waiting time of each frame and when the waiting time is transmitting data the size of the frame should be random. Waiting time of frames should not be the same as it can cause data collisions.

It allow each frame to be achieved with the help of special frames. Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in with a degree in Computer Science. Follow him on Twitter HarlonMoss. Difference Wiki IT.

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What Is The Difference Between Pure ALOHA And Slotted ALOHA?

The objective of the ALOHA protocol is to determine what competing channel must find the next chance of accessing the multi-access station at the MAC layer. When every channel transmits the data without assessing whether the channel is free or not there is always the chance of the crash of data frames. If a frame is damaged, then the channels waiting for a random quantity of type and retransmit the frame until it transmits successfully. He suggested dividing the time into discrete intervals called slots. Every time slot corresponds to the length of the framework. The Slotted ALOHA makes the channel to wait until the next time slot starts and let every data frame to be transmitted in the new time slot.

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Differences between Pure Aloha and Slotted Aloha

The purpose of the ALOHA protocol is to determine that which competing station must get the next chance of accessing the multi-access channel at MAC layer. Introduced by Roberts in Frame Transmission The user can transmit the data frame whenever the station has the data to be transmitted. The user has to wait till the next time slot start, to transmit the data frame. The time here is globally synchronized. When every station transmits the data without checking whether the channel is free or not there is always the possibility of the collision of data frames.

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Differences between Pure and Slotted Aloha

In Pure Aloha, Stations transmit whenever data is available at arbitrary times and Colliding frames are destroyed. While In Slotted aloha, A station is required to wait for the beginning of the next slot to transmit. GeeksforGeeks has prepared a complete interview preparation course with premium videos, theory, practice problems, TA support and many more features. Please refer Placement for details.

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Pure ALOHA vs. Slotted ALOHA

ALOHA is a system for coordinating and arbitrating access to a shared communication networks channel. A shared communication system like ALOHA requires a method of handling collisions that occur when two or more systems attempt to transmit on the channel at the same time. In pure ALOHA, the stations transmit frames whenever they have data to send and in case two or more stations transmit simultaneously there will be a collision and frames will get destroyed. Therefore, every time a station transmits a frame, it expects the acknowledgement from the receiver and if the receiver does not get it within the specified time, the station assumes that the frame has been destroyed. The station has now to wait for a given amount of time before it sends again. In slotted ALOHA, the stations can send a frame at the beginning of the slot and only one frame is sent in each slot and in case any station is unable to place the frame onto the channel at the beginning of the slot, it misses the time slot then the station has to wait until the beginning of the next time slot.

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