From the Transport to the Physical Channel in LTE

  • Transport channels are then mapped on the physical channels which are sent over the air interface
  • A CRC is calculated and appended to each TB. It allows the receiver to detect errors. It is used by retransmission mechanisms like H-ARQ
  • Depending on the Transport Format and the radio quality, the TB is coded and interleaved.
  • The H-ARQ is a process running in the UE and in the eNodeB to allow a fast retransmission in case of errors.
  • The resulting bit sequence is modulated and mapped on the sub-carriers of the Resource Block used for the transmission (one or several RBs).
  • The data are modulated and mapped on the sub-carriers.
  • The basic time-frequency unit is the Resource Block.
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