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Explain in detail the IEEE 802.11 MAC Layer

Mumbai University > Information Technology > Sem 7 > Wireless Technology

Marks: 10M

Year: Dec 2015

1 Answer
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WLAN is standardized by IEEE and given name 802.11 known as wireless Ethernet.

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MAC Layer:

Tasks:

  • Channel allocation
  • Protocol data unit (PDU) addressing
  • Frame formatting
  • Error checking
  • Fragmentation
  • Reassembly

Protocols used in MAC are: CSMA/CA and MACA

MAC Frame:

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Four Addresses:

  1. BSS Identifier
  2. Destination Address
  3. Source Address
  4. Receiver Address

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Duration ID: rest of duration to get next frame transmission

Sequence Control: Seq no. of frames of fragments

Frame Control: Holds info related to control type

MAC management:

  • CRC checksum
  • Packet fragmentation
  • Roaming provision
  • Support for time bounded data
  • Synchronization
  • Power management
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