Hello Experts.
While deploying 5GNSA which MIMO configuration is initially prefered?
What challenges you faced during deployment interms of infrastructure (space weight,power)?
Massive MIMO will be used.
In 6G there will be distributed MIMO meaning pairing of the users for MU-MIMO will be much easier and basically each UE will be served by 4/8 layers.
We can deploy either 32T32R or 64T64R massive MIMO.
The max number of layer is 4 (RI= 4) as we are currently using 4 port DMRS (Configuration 1, Type A).
Normally the power used is 200 Watt for 100 MHz BW.
The weight of the Massive MIMO unit typically ranges from 12 Kg to 20 Kg.
Hi, in your case I think 2 SSB deployed, that’s why 4 layers you’ve seen.
Nope… We have only 1 SSB ( E//), number of SSBs has no relation with the number of PDSCH layers, no of layers depends on the no of DMRS ports you configure.
SSB have nothing to do with number of layers.
Note that UE is always served with single SSB at given location,no matter how many SSBs are configured.
Yes, UE select SSB on the basis of SSB threshold RSRP parameter.
But for 4 RX UE with 2 SSB beams you can find 4 layers having single codeword if radio condition is good and UE report rank 4.
No, it’s not correct.
At a time only 1 SSB beam is being used by UE.
Not multiple.
With rank 4 how single SSB possible (seen 2 beam index used indicates 2 SSB)?
You are confusing SSB beams with PDSCH beams.
There is no relation between these two.
Beamforming is based on number of CSI-RS transmitted or SRS.
Also DMRS is used to check quality of beams for demodulation.
SSB beam is always single serving beam, UE can monitor multiple SSB beams for mobility but PDSCH is only from serving SSB beam.
This is coming from Nokia, their old 5G RAN could deliver only 2 PDSCH layers, same like SSB beam.
But even now Nokia have separate PDSCH layers, not SSB anymore.
Yes, right.
Yes, correct.
Any public document / link I can refer for understanding in NR?
This PDSCH beam concept seen with LTE TM8 mode, but for NR not find any relevant link / doc.
It is well explained in NR in bullets.
No.
What will be optimal for initial deployment as per your experience?
Did you later realize that your 8T8R would have to fine for optimal CAPEX or 64 would have been better?
What are 4G band are you deploying and which one is your anchoring layer?
And is SUL or CA performed?
Both 32T32R and 64T64R has similar antenna gain, just a difference of 1 dB.
You can check the cost, space and weight for deployment feasibility etc.
We have L2300, 2100, 1800 and 900.
No SUL.
Which one is anchoring layer in 4G and why?
How you are compensating for UL cov?
All are anchoring layers.
We can set the priority of each layer.
The priority is decided based on the number of support band combinations supported by the UE.