5G NR PHY Layer : PUCCH

5G NR PHY Layer : PUCCH

Physical Uplink Control Channel – conveys Uplink Control Information (UCI).

PUCCH carries service/UCI Payload such as HARQ/Scheduling Requests/Modulation/PRB allocation/Channel State Information.
Uplink Reference Signal – There are three different kind of UL Reference signals in 5G –

•DMRS – Demodulation reference signal for PUSCH and PUCCH – The DMRS is specific for specific UE and is used to estimate the radio channel.
•PTRS – Phase Tracking reference signal – The phase noise of a transmitter increases as the frequency of operation increases. The PTRS plays a crucial role especially at mm Wave frequencies to minimize the effect of the oscillator phase noise on system performance
•SRS – Sounding Reference Signal – It is transmitted by the UE to help the gNB obtain the channel state information (CSI) for each user. Channel State Information describes how the NR signal propagates from the UE to the gNB and represents the combined effect of scattering, fading, and power decay with distance. The system uses the SRS for resource scheduling, link adaptation, Massive MIMO, and beam management.

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