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What do you mean by random access protocols? Explain slotted ALOHA in brief.

Demystifying Random Access Protocols: A Deep Dive into Slotted ALOHA

What are Random Access Protocols?

  • Enable multiple devices to share a single communication channel without central coordination.
  • Devices transmit data whenever they have data to send.
  • Risk of collisions when multiple devices transmit simultaneously.
  • Examples include ALOHA, Slotted ALOHA, CSMA, and CSMA/CD.
  • Used in various networks like Wi-Fi and satellite communication.

Understanding Slotted ALOHA

  • Divides time into discrete slots synchronized across all devices.
  • Devices can only transmit at the beginning of a time slot.
  • Reduces the probability of collisions compared to pure ALOHA.
  • If a collision occurs, the device retransmits after a random delay.
  • Simple to implement but suffers from low throughput at high loads.
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