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
|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|
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|
|SC-FDMA||Filtered OFDM or
|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|
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