Uplink physical channel
PUSCH : Physical UplinkShared Channel / Uplink shared physical channel
Used to carry uplink user data
PUCCH : Physical UplinkControl Channel / Uplink Control Physical Channel
Used for L1/L2 control signaling such as HARQ feedback, CQI feedback, scheduling request indication, etc.
PRACH : Physical RandomAccess Channel/ Random Access Channel
Used for user random access request information
Uplink physical signal
The RS-the DM : Demodulationreference Signals / demodulation reference signal
Used for uplink data demodulation, time-frequency synchronization, etc.
The RS-the PT : Phase-trackingreference Signals / phase tracking reference signal
Used for uplink phase noise tracking and compensation
The SRS : the Sounding Reference Signal / sounding reference signal
Used for uplink channel measurement, time-frequency synchronization, beam management
Antenna port resource range
[0 , 1000) : used for PUSCH and related demodulation reference signals
[1000,2000) : for SRS
[2000,4000) : for PUCCH
[4000,4000] : for PRACH
Downlink physical channel
PDSCH : Physical DownlinkShared Channel / Downlink shared physical channel
Used to carry downlink user data
PBCH : Physical BroadcastChannel / Broadcast physical channel
Used to carry system broadcast messages
PDCCH : Physical DownlinkControl Channel / Downlink Control Physical Channel
Used for transmission of control signaling such as uplink and downlink scheduling and power control
Downlink physical signal
The RS-the DM : Demodulationreference Signals / demodulation reference signal
Used for downlink data demodulation, time-frequency synchronization
The RS-the PT : Phase-trackingreference Signals / phase tracking reference signal
Used for downlink phase noise tracking and compensation
CSI-RS : Channel-stateinformation reference signal/ channel state information reference signal
Used for downlink channel measurement, beam management, RRM/RLM measurement and refined time-frequency tracking, etc.
The PSS : Primarysynchronization Signal / primary synchronization signal
Time domain synchronization, get cell ID (NID2)
SSS : Secondarysynchronization signal / Secondary synchronization signal
Frequency domain synchronization and simultaneous acquisition of cell group ID (NID1)
Antenna port resource range
[1000,2000) : for PSDCH
[2000,3000) : used for PDCCH
[3000,4000) : used for CSI-RS
[4000, infinity) : used for SS and PBCH
Compared with LTE, the 5G downlink physical channel removes the PHICH and PCFICH, removes the CRS from the reference signal, adds PT-RS, and enhances the role of DMRS and CSI-RS.
