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.