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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The objective of this website is to share knowledge and keep track of different topics related to mobile and wireless technology. I am 5G researcher and trainer I have worked on 5G Radio Access Systems Research and Standardization Group on several topics with various vendors and operators such as Nokia, Huawei, Ericsson, Orange, in research, product management and development roles all over the world.

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