Wireless Media Access Control (Slide 5)

• Three values of IFS are used:

  • SIFS
    • Short IFS is used for all immediate response actions.
    • Upon reception of a frame ack frames are sent after a SIFS delay.
  • PIFS
    • Point coordination function IFS is used for central access control.
  • DIFS
    • Distributed coordination function IFS is used as a minimum delay for asynchronous frames contending for access.

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