Technology

Difference between pure ALOHA and grooved ALOHA

Key differences

The difference between Pure ALOHA and Slotted ALOHA is that in Pure ALOHA time is continuous while in Slotted ALOHA time is discrete .

ALOHA puro vs ALOHA ranurado

In a computer system, there is a sublink layer, and pure ALOHA and slotted ALOHA are random access protocols that are implemented. In the network protocol system, the purpose of both pure ALOHA and slotted ALOHA is the same, which is to determine that the competing station should have the next opportunity to access the multiple access channel. And that is done at the MAC layer which is the middle access control layer. There are types of ALOHA which are pure ALOHA and slotted ALOHA and the main difference between pure ALOHA and slotted ALOHA is that in pure ALOHA time is continuous while in slotted ALOHA time is discrete .After the invention of Pure ALOHA in 1970, Robert introduced the Slotted ALOHA, which was another method of enhancing the capacity of Pure ALOHA. Slotted ALOHA improves all the problems that were in Pure ALOHA. In ALOHA Slotted, time is divided into different time slots. This time interval corresponds to the length of the frames. Pure ALOHA allows data transmission as long as data is sent, while Slotted ALOHA does not allow data transmission. The slotted ALOHA waits until the next slot is free. It allows each frame to be achieved with the help of special frames. The slotted ALOHA formula is S = S * e ^ -G and when the throughput is maximum, it is G = 1 which is 37% of the total data frames transmitted .

In Pure ALOHA time is continuous, Pure ALOHA was introduced by Norman Abramson and Pure ALOHA was introduced at the University of Hawaii association in 1970. Pure ALOHA has data to be sent and allows each station to transmit data. There is a possibility of data frame collision when each station transmits the data without checking whether the channel is free or not. If the frame is free, then it’s fine to get the frame for data transmission, while if there is no free frame, the data collides. This collision causes the frame to be overloaded and the frame is destroyed. When the frame has damaged the stations, the random amount of type has to be waited, and when the frame is free, the transmission is successful. There is a timeout for each frame and when the timeout is transmitting data, the size of the frame should be random. Frame timeouts should not be the same, as this can lead to data collisions. When the frame size is uniform, the performance of pure ALOHA is maximum. There is a formula to calculate the yield which is S-=G*e^-2G.

Comparison chart

Pure ALOHA ALOHA slotted
In Pure ALOHA time is continuous In ALOHA slotted, time is discrete .
Inserted
Pure ALOHA was introduced by Norman Abramson and Pure ALOHA was introduced at the University of Hawaii association in 1970 Robert introduced ALOHA Slotted which was another method to enhance the ability of Pure ALOHA
Formula
There is a formula to calculate the yield which is S-=G*e^-2G. The slotted ALOHA formula is S=S*e^-G
Global
Time is globally synchronized in Pure ALOHA Time is not globally synchronized in ALOHA slotted
What is Pure ALOHA?

In Pure ALOHA time is continuous, Pure ALOHA was introduced by Norman Abramson and Pure ALOHA was introduced at the University of Hawaii association in 1970. Pure ALOHA has data to be sent and allows each station to transmit data. There is a possibility of data frame collision when each station transmits the data without checking whether the channel is free or not. If the frame is free, then it’s fine to get the frame for data transmission, while if there is no free frame, the data collides. This collision causes the frame to be overloaded and the frame is destroyed. When the frame has damaged the stations, the random amount of type has to be waited, and when the frame is free, the transmission is successful. There is a timeout for each frame and when the timeout is transmitting data, the size of the frame should be random. Frame timeouts should not be the same, as this can lead to data collisions. When the frame size is uniform, the performance of pure ALOHA is maximum. There is a formula to calculate the yield which is S-=G*e^-2G.

What is ALOHA Slotted?

After the invention of Pure ALOHA in 1970, Robert introduced the Slotted ALOHA, which was another method of enhancing the capacity of Pure ALOHA. Slotted ALOHA improves all the problems that were in Pure ALOHA. In ALOHA Slotted, time is divided into different time slots. This time interval corresponds to the length of the frames. Pure ALOHA allows data transmission as long as data is sent, while Slotted ALOHA does not allow data transmission. The slotted ALOHA waits until the next slot is free. It allows each frame to be achieved with the help of special frames. The slotted ALOHA formula is S = S * e ^ -G, and when throughput is maximum, it is G = 1 which is 37% of the total data frames transmitted.

Key differences
  1. In Pure ALOHA time is continuous, while in Slotted ALOHA time is discrete .
  2. Pure ALOHA was introduced by Norman Abramson and Pure ALOHA was introduced at the University of Hawaii association in 1970, while Slotted ALOHA was introduced by Robert, which was another method of enhancing Pure ALOHA’s ability.
  3. There is a formula for calculating throughput which is S-=G*e^-2G, while the ALOHA grooving formula is S=S*e^-G.
  4. Time is globally synced in Pure ALOHA while time is not globally synced in Slotted ALOHA

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