802.16 Protocol Architecture                                    

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• The 802.16 standard only addresses the bottom 2 layers in the 7 layer ISO model
• All layers above data link are independent of network architecture

• The 802.16 Standard replaces the physical and data link layers with:

• Physical layer specifies
  • Transmission mediums
  • Frequency bands

• Transmission layer specifies
  • Encoding/decoding of bits
  • Preamble generation and removal (synchronization)
  • Bit transmission and reception

   

• The MAC layer specifies
  • Assembling data into frames
  • Error detection
  • Disassembly and address recognition
  • The MAC layer is also able to allocate radio channel capacity so as to satisfy service demands

   

• Convergence Layer specifies
  • Functions specific to the service being provided
  • Encapsulating protocol data units (PDU) structure to upper layers in stack
  • Translate upper layer service demands to appropriate MAC header format

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