What are the differences between pure and slotted Aloha?

In Pure Aloha, any station can transmit data at any time. In Slotted Aloha, any station can transmit data only at beginning of any time slot. In Pure Aloha, time is continous and is not globally syncronized. In Slotted Aloha, time is discrete and is globally syncronized.

What is the one most important difference between pure ALOHA and slotted Aloha?

1. In pure aloha, data can be transmitted at any time by any station. In slotted aloha, data can be transmitted at the beginning of the time slot.

What is slotted Aloha protocol?

ALOHA is a medium access control (MAC) protocol for transmission of data via ashared network channel. Using this protocol, several data streams originating from multiple nodes are transferred through a multi-point transmission channel.

What is ALOHA and Pure ALOHA?

ALOHA is a medium access control (MAC) protocol for transmission of data via a shared network channel. Using this protocol, several data streams originating from multiple nodes are transferred through a multi-point transmission channel. There are two types of ALOHA protocols – Pure ALOHA and Slotted ALOHA.

What is the Protocol procedure for the slotted ALOHA protocol?

The following describes the protocol procedure for the slotted aloha protocol. In slotted aloha, time is divided into slots. A sender may send a frame at the start of the time slot. If the sender does not send at the start then it will wait for the next slot.

What is the difference between Slotted and Pure ALOHA?

The time of sender and receiver in pure ALOHA is not globally synchronized whereas, the time of sender and receiver in slotted ALOHA is globally synchronized. The maximum throughput occurs at G=1/2 which is 18 % whereas, the maximum throughput occurs at G=1 which is 37%.

What is the procedure in pure ALOHA for communication?

Following is the procedure in pure aloha for communication. When a network station needs to send a frame, it sends it immediately and waits for an acknowledgment. If the sender receives an acknowledgment, the sender may send the next frame.

What is the throughput of the slotted ALOHA?

The formula to calculate the throughput of the Slotted ALOHA is S=G*e^-G, the throughput is maximum when G=1 which is 37% of the total transmitted data frames. In Slotted ALOHA, 37% of the time slot is empty, 37% successes and 26% collision. Pure ALOHA was introduced by Norman and his associates at the university of Hawaii in 1970.