Massive MIMO MUBF Pairing Rule

Hi Experts,
Anyone looking into eran16.1 params of Huawei?

I am finding weird params there like this one: MassiveMIMOMUBFPairingRule.

Huawei claims that base don this switch they will paid the UEs for MU-MIMO based on low correlation or not.
But if low correlation is not taken into account what is the principle to pair the UEs for MU-MIMO beamforming?

Please read the MM feature, it also mention about mu-mimo principle.

The only principle to pair the UEs is low correlation.
There is no other rule to pair the UEs for MU-MIMO.

Is there difference between TDD and FDD MU-MIMO?

This param applies to both FDD and TDD.
What other OEMs (like Nokia for example) have a configurable threshold for correlation.
For example if correlation is lower than 0.3 then UEs can be paired for MU-MIMO.
And this 0.3 is configurable by MNOs.
Could be 0.4 or 0.2 or any other value between 0 and 1.

Nobody set this parameter as Without_Correlation.
No idea why they have given this option.

You can set without correlation but that means all Ues are paired (regardless of correlation) and will be huge SINR degradation between beams leading to reduced system capacity.
But this sounds like a suicide solution. No idea why Huawei allows this option…

Yes, right.

Many parameters in Huawei like this…

Huawei, typically, has a high degree of freedom to optimize the network via regular parameters and switches, different from the others and their hardcoded or constant values only changed by vendor staff
This also allow you to make bad optimizations :sweat_smile:

UE Pairing is based on highest gain to the system. it occurs for 2 UEs having highest SINR and approximately orthogonal channels.

I remember in Nokia LTE correlation/orthogonality is a parameter.
It’s up to MNO how much he wants to screw his network.

This is in Huawei system, not for Nokia.

I think correlation and UE pairing has nothing to do with high SINR of the 2 UEs.
And it is not just 2 UEs, can be up to 8 UEs in Huawei for pairing in NR.
8 UEs meaning 16 PDSCH layers for 8 paired UEs in teh ideal case.
Of course in reality we will seldom see this, but it is common to see 3-4 UEs paired in 6-8 PDSCH layers.

This for LTE and it is for UEs having highest SINR and ~ orthogonal channels.

Huawei has 24 PDSCH layers in LTE. This is much more than only 2 UEs.

You are talking about LTE 64T64R Massive MIMO antenna, is that right?

Yes, correct.

16 Layers in DL and 8 Layers in UL.

2 when having normal MU-MIMO (here is normal mimo, not massive mimo).