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How Many LTE Downlink Transport Channel ? How its Work?

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There are major four channel in LTE Downlink trasport channel. which list below with its work in short.

Paging Channel ( PCH)

  • Supports UE discontinuous reception (DRX) to enable UE power saving.
  • Broadcasts in the entire coverage area of the cell.
  • Mapped to physical resources which can be used dynamically also for traffic/other control channels.

Broadcast Channel ( BCH )

  • The LTE transport channel maps to Broadcast Control Channel (BCCH).
  • Fixed, pre-defined transport format.
  • Broadcast in the entire coverage area of the cell.

Multicast Channel ( MCH)

  • Broadcasts in the entire coverage area of the cell.
  • Supports MBSFN combining of MBMS transmission on multiple cells.
  • Supports semi-static resource allocation e.g.with a time frame of along cyclic prefix.

Downlink Shared Channel ( DL-SCH )

  • Main channel for downlink data transfer. It is used by many logical channels.
  • Supports Hybrid ARQ.
  • Supports dynamic link adaptation by varying the modulation, coding and transmit power.
  • Optionally supports broadcast in the entire cell.
  • Optionally supports beam forming.
  • Supports both dynamic and semi-static resource allocation.
  • Supports UE discontinuous reception (DRX) to enable UE power saving.
  • Supports MBMS transmission.
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