802.16d PHY – TDD

By Vikas Bagwe -
Fixed WiMAX (802.16d) PHY - TDD
  • Uplink & Downlink transmission shares the same frequency. 
  • Uplink & Downlink transmission are separated in time. 
  • TDD Frame has a fixed duration. 
  • A TDD frame contains one uplink & one downlink subframe. 
  • TDD Framing is adaptive i.e capacity allocated to downlink versus uplink may vary. 
  • Tx/Rx Transition Gap (TTG) between downlink burst & subsequent uplink burst allows time for BS to switch from Tx mode to Rx mode and SS to Rx mode to Tx mode. 
  • BS looks for first symbols of uplink burst after TTG. 
  • Rx/Tx Transition Gap (RTG) between uplink burst & subsequent downlink burst allows time for BS to switch from Rx mode to Tx mode and SS to Tx mode to Rx mode. 
  • SS looks for first symbols of modulated data in downlink burst after RTG

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