Differences between Pure Aloha and Slotted Aloha

Computer EngineeringComputer NetworkMCA

Both Pure Aloha and Slotted Aloha are Random Access Protocols.

Following are the important differences between Pure Aloha and Slotted Aloha.

Sr. No.KeyPure AlohaSlotted Aloha
1Time SlotIn 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.
2TimeIn Pure Aloha, time is continous and is not globally syncronized.In Slotted Aloha, time is discrete and is globally syncronized.
3Vulnerable timeVulnerable time = 2 x Tt.Vulnerable time = Tt.
4ProbabilityProbability of successful transmission of data packet = G x e-2GProbability of successful transmission of data packet = G x e-G
5Maximum efficiencyMaximum efficiency = 18.4%.Maximum efficiency = 36.8%.
6Number of collisionsDoes to reduces the number of collisions.Slotted Aloha reduces the number of collisions to half thus doubles the efficiency.
raja
Published on 26-Nov-2019 10:48:09
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