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.
- 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 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