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Basic Function of Uplink & Downlink Transport Channel in LTE

Basic Function of Uplink & Downlink Transport Channel in LTE

Uplink Transport Channel:

  • Purpose: Facilitates the transmission of user data from the User Equipment (UE) to the eNodeB (base station).
  • Channels: Includes the Physical Uplink Shared Channel (PUSCH) for user data and the Physical Uplink Control Channel (PUCCH) for control information.
  • Data Transmission: Carries information such as user-generated data, acknowledgments, and control signals from the UE to the network.

Downlink Transport Channel:

  • Purpose: Enables the transmission of data from the eNodeB to the User Equipment (UE).
  • Channels: Comprises the Physical Downlink Shared Channel (PDSCH) for user data, the Physical Broadcast Channel (PBCH) for system information, and the Physical Downlink Control Channel (PDCCH) for control information.
  • Data Delivery: Delivers user-specific data, broadcast information, and control signals from the network to the UE.
Downlink Transport Channel
Broadcast Channel (BCH)
  • A fixed TF
  • Used for transmission of parts of BCCH, so called MIB

Paging Channel (PCH)

  • Used for transmission of paging information from PCCH
  • Supports discontinuous reception (DRX)

Downlink Shared Channel (DL-SCH)

  • Main transport channel used for transmission of downlink data in LTE
  • Used also for transmission of parts of BCCH, so called SIB
  • Supports discontinuous reception (DRX)

Multicast Channel (MCH)

  • Used to support MBMS
Uplink Transport Channel

Uplink Shared Channel (UL-SCH)

  • Uplink counterpart to the DL-SCH

Random Access Channel(s) (RACH)

  • Transport channel which doesn’t carry transport blocks
  • Collision risk
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