Random Access protocols

• When node has packet to send

  • transmit at full channel data rate R.
  • no a priori coordination among nodes

• two or more trasnmitting nodes -> “collision”,

• random access MAC protocol specifies:

  • how to detect collisions
  • how to recover from collisions (e.g., via delayed retransmissions)

• Examples of random access MAC protocols:

  • slotted ALOHA
  • ALOHA
  • CSMA and CSMA/CD

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