DCI (Downlink Control Information) is a control message transmitted on the PDCCH (Physical Downlink Control Channel) in LTE. It contains scheduling information for downlink (PDSCH) and uplink (PUSCH) transmissions.
- Function:
- Assigns resource blocks for data transmission.
- Controls HARQ processes (ACK/NACK).
- Manages power control for uplink transmissions.
- Layer: MAC Layer (via PHY Layer PDCCH)
- Format: Different DCI formats are used for various
scheduling needs.
Types of DCI Formats in LTE?
How DCI Works in LTE?
·
EnodeB
schedules resources for UE
based on CQI, HARQ, and channel conditions.
·
DCI message is transmitted on PDCCH to
inform the UE about frequency, time,
and MCS (Modulation and Coding Scheme).
·
UE
decodes the DCI message to know when and where to transmit or receive
data.
·
HARQ
feedback (ACK/NACK) is sent back to confirm correct reception.
Debugging
DCI in QXDM:-
DCI issues can lead to low
throughput, high BLER, or call drops.
DCI
Performance Metrics in LTE:-
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