What is CSI-RS in 5G?
John Peck What is CSI-RS in 5G?
Channel State Information Reference Signal (CSI-RS) is a reference signal (RS) that is used in the Downlink (DL) direction in 5G NR, for the purpose of Channel Sounding and used to measure the characteristics of a radio channel so that it can use correct modulation, code rate, beam forming etc.
What is CSI-RS port?
CSI-RS ports are the number of radiating elements (or group of antennas) of an active antenna unit. So there can be 4×4 MIMO with 8 CSI-RS ports with 16 CSI-RS ports or with 4 CSI-RS ports. Are not related with each other. Only conditions is that MIMO layers cannot be higher than CSI-RS ports.
What is CSI-RS resource?
CSI-RS refers to channel state information reference signal and these signals are downlink only signal. It is used for DL CSI acquisition. 5G NR standard allows high level of flexibility in CSI-RS configurations, a resource can be configured with up to 32 ports.
What is CSI NR?
As in LTE CSI, NR CSI (Channel Status Information) is a mechanism that a UE measure various radio channel quality and report the result to Network(gNB). However, from LTE TM9 we stared using a special reference signal for CSI.
What is CSI 32 port?
What is CSI-RS? Channel State Information Reference Signal (CSI-RS) is a reference signal (RS) that is used in the Downlink (DL) direction in 5G NR, for the purpose of Channel Sounding and used to measure the characteristics of a radio channel so that it can use correct modulation, code rate, beam forming etc.
What is 5G codebook?
Putting it other way, Codebook is a kind of matrix (a matrix having complex value elements) that transform the data bit (PDSCH) to another set of data that maps to each antenna port.
What is CSI report?
CSI Report – Overview CSI stands for Channel Status Information. As the name implies, it is a kind of indicator how good or bad the channel is at a specific time. The CSI has three major components as below. Not all of these indicator is measured for every CSI report.
Which reference signal is used with Pdcch in 5G?
In 5G NR, PDSCH is the physical downlink channel that carries user data. DM-RS and PT-RS are the reference signals associated with PDSCH. These signals are generated within the PDSCH allocation, as defined in TS 38.211 Sections 7.4. 1.1 and 7.4.
What is a CSI report?
What is TRS in 5G NR?
Tracking reference signals (TRS) are sparse reference signals intended to assist the device in time and frequency tracking. Sounding reference signals (SRS) are uplink reference signals transmitted by the devices and used for uplink channel-state estimation at the base stations.
What is Pbch Dmrs in 5G?
PBCH DMRS is a special type of physical layer signal which functions as a reference signal for decoding PBCH. In LTE (at least in TM1, 2, 3, 4), we don’t need this kind of special DMRS for PBCH because we can use CRS(Cell Specific Reference Signal) for PBCH decoding. However, in 5G/NR there is no CRS.
