In 5G, is Beamforming done based on srs or csi-rs?

Fathy_Farouk · January 9, 2024, 3:00am

Hello Experts.

If answer is srs, so what function of csi-rs in beamgorming weight calculation?

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RFSpecialist · January 26, 2024, 10:45pm

It is possible based on both.

Actually gNodeB switch between one and another based on UL SINR of SRS:

When UL SINR is good in TDD it used SRS weights for beamforming.

When UL SINR of SRS is based or on FDD it uses PMI weights.

Fathy_Farouk · January 26, 2024, 10:46pm

So that means if working on srs, so no need for csi-rs at all, right?

RFSpecialist · January 26, 2024, 10:47pm

pmi needs csi-rs.

It is needed because switching between pmi and srs weight is done fast.