For 5G, what scenario leads to use of 32 ports for csi-rs?

5G NR
1

Hi Experts.
For 5G, what scenario leads to use of 32 ports for csi-rs?
I.e. row no 16, 17, 18… any UE supporting it in market?

In my view 16 ports for csi-rs is enough to support TX on 16 layers, i.e. 8 SSB if used.

2

Most UEs support 32 csi-rs ports.
It is needed for sharp beams and high sinr in DL.
Also good for MU-MIMO.

3

Please provide UE model, if you have seen.

In logs I have seen number of ports : p8 at max which leads to understanding that UE measuring csi-rs signal from 8 ports to report csi.

4

Nokia support both 8port configuration. With n1-n2: (2,2) with can support upto 256 beams

image
image720×1600 124 KB

https://www.sharetechnote.com/html/5G/5G_CSI_RS_Codebook.html#:~:text=N1%2C%20N2%2C%20O1%2C%20O2%20are%20defined%20in%203GPP%20as%20shown%20below

Concept is very well explained :point_up_2:t3: by @Jaeku_Ryu, if anyone is interested.

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