For LTE CA for band combination, what max MIMO layer IE indicates I’m getting error for 3 CC CA?
Any way to identify number of layers for Aggregated Carriers?
Number of layers per CC is in DCI.
You won’t see it in RRC layer 3 messages.
But for UE capabilities (band combination what max mimo layer IE indicates) you can check cacombos.com.
I think with tm3 I need to reduced no of layers, from 4 to 2.
Aggregated combo exceeding max.
With every CA combination what max layer UE can support is part of UE capability?
I find for band 3 CA bandwidth class is C with supported MIMO capability 2 layers.
Does it mean for band 3 with 2 carriers I can’t use tm3 with 4 ports?
TM3 is transmit diversity. It is always supported.
Tm3 transmit diversity?
My query is that for both carriers, can I use 2 layers so it sum up to 4 layers?
As supported MIMO capability DL is 2 layers.
Ohh sorry. My bad.
I mean TM3 TM4 both can have Tx diversity.
And 2 layers can be use with both TM3 and TM4.
Layers are per carrier.
Ok got it!
So per carrier I can use 2 layers only.
2 carrier aggregated doesn’t mean 4 layer.
Not beyond 2 can I use?
When your in CA mode, THEN you cannot use more than 2 layers.
Without CA your layer support can be 4.
Ok let me put this way:
With supported MIMO DL capability as 2 layers with bandwidth class C.
It’s clear I can use 2 CC, i.e. intra band contiguous as it’s in item 0.
Now my query: can I use in CA mode for each carrier 4 layers?
With above mentioned condition.
No, you can’t.
Ok now clear.
That’s why my CA getting failed a s someone uses 1 carrier using 4 layers, 2 with 2 layers.
So it’s exceeding max layers condition.
But CA should not get failed, rather carrier having 4 layer should change to 2 layers, shouldn’t it?
No it’s not happening as UE consider config given by network for 4 layers on pcell, then scell 1 having 2 layers, so as per UE capability it’s exceeding max layers condition.
This is weird.
There will be many UEs with 2 layer possibility, and network can have 4 layer.
So do you mean CA will be failed for all such UEs?
Yes one of prominent reason.
I am still in doubt.
Even though Pcell is configured with 4 layers, for THAT ue eNB will only scheduled with 2 layers.