5G • RAN
PUCCH
Physical Uplink Control Channel
Dedicated uplink physical channel transmitting Uplink Control Information (UCI) including HARQ-ACK, SR, and CSI.
Technical Explanation
PUCCH transmits UCI without user data. 5G NR defines 5 distinct PUCCH Formats (0 through 4) optimized for varying payload sizes (from 1 bit up to hundreds of bits) and durations (short 1-2 symbols or long 4-14 symbols) across slot boundaries.
Key Functions
- Carries HARQ ACK/NACK feedback for received downlink PDSCH transmissions
- Sends Scheduling Requests (SR) to demand uplink resources
- Reports periodic and semi-persistent Channel State Information (CSI)
Specifications
3GPP TS 38.211, TS 38.213
Interfaces
Uu
Related 5G Concepts
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