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Home 5G knowledge 5G NR DL and UL Physical channels:

5G NR DL and UL Physical channels:


5G NR DL and UL Physical channels:

Below definition of DL Physical channels and UL Physical channels with comparison between 4G and 5G.

-DL Physical channels

5G downlink physical channel corresponds to a set of resource elements carrying information originating from higher layers.

Downlink Physical channels in 5G:

-Physical downlink control channel (PDCCH): that carries DCI for downlink control information (DCI)

-Physical Downlink Shared Channel (PDSCH): that carries the user data and System information  for user

-Physical broadcast channel (PBCH) which carries the necessary system information to enable a UE to access the 5G network.

Comparison between DL Channels in 4G and 5G

PDSCH (5G) PDSCH (LTE) PDCCH (5G) PDCCH (LTE)
Purpose Transmit DL Data Transmit DL Data L1/L2 Control

channel

L1/L2 Control

channel

Waveform OFDM OFDM OFDM OFDM
Bandwidth Numerology

dependent

1.4/3/5/10/15/20

MHz

Localized in

BWP

Spread out in  the entire  bandwidth
Reference  signals Only UE specific  signals (DMRS) Cell specific or UE  specific (Rel. 10) UE specific  (DMRS) Cell specific  (CRS)
Modulation Up to 256QAM Up to 256 QAM QPSK QPSK
Coding scheme LDPC Turbo Polar TBCC

5G Uplink Physical channels

An uplink physical channel corresponds to a set of resource elements carrying information originating from higher layers.

Uplink Physical channels are:

-Physical Uplink Control Channel (PUCCH): Used for uplink control information, which includes: HARQ feedback acknowledgments, scheduling request, and downlink channel-state information  for link adaptation.

-Physical Uplink Shared Channel (PUSCH): Used for uplink data transmission (by a UE).

-Physical Random Access Channel (PRACH): Used by a UE to request connection setup referred to as random access.

Comparison between UL Channels in 4G and 5G:

PUSCH (5G) PUSCH ( LTE) PUCCH (5G) PUCCH (LTE)
Purpose Transmit UL Data Transmit UL Data L1/L2 Control  information L1/L2 Control  information
Waveform OFDM or

SC-FDMA

SC-FDMA Filtered OFDM or

SC-FDMA

SC-FDMA
Bandwidth Depend on  numerology 1.4/3/5/10/15/20 Many flexible  formats in  time/freq. 1 RB in freq.

14 symbols time

Modulation Up to 256 QAM Up to 256 QAM QPSK QPSK
Coding scheme LDPC Turbo RM/Polar RM/TBCC

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