纯 Aloha 和 Slotted Aloha 之间的差异

先决条件——计算机网络|多种访问协议
Aloha 是一种随机访问协议，它有两种类型，一种是Pure Aloha ，另一种是Slotted Aloha 。
在 Pure Aloha 中，只要数据在任意时间可用，站点就会传输，并且碰撞帧会被破坏。而在 Slotted aloha 中，A 站需要等待下一个时隙的开始进行传输。与纯 Aloha 相比，脆弱期减半。

现在，我们将看到这些协议之间的区别：

S.NO	Pure Aloha	Slotted Aloha
1.	In this aloha, any station can transmit the data at any time.	In this, any station can transmit the data at the beginning of any time slot.
2.	In this, The time is continuous and not globally synchronized.	In this, The time is discrete and globally synchronized.
3.	Vulnerable time for pure aloha = 2 x Tt	Vulnerable time for Slotted aloha = Tt
4.	In Pure Aloha, Probability of successful transmission of data packet = G x e-2G	In Slotted Aloha, Probability of successful transmission of data packet = G x e-G
5.	In pure aloha, Maximum efficiency = 18.4%	In slotted aloha, Maximum efficiency = 36.8%
6.	Pure aloha doesn’t reduces the number of collisions to half.	Slotted aloha reduces the number of collisions to half and doubles the efficiency of pure aloha.