UE assistance information in 5G due to overheating

Has anyone seen UE reporting UE assistance information in 5G due to overheating?
Like explained here:

I want to know if there are UEs supporting this feature.
I haven’t seen in logs but there is scgfailureinformation due to overheating.
Wondering why UE hasn’t send UEassistance information (to reduce CA NR or to reduce layers MIMO) instead of dropping the radio link in 5G.

Actually in samsung devices we have RLF due to overheating info indication pegged as RLF due to Thermal fails.
I don’t remember the i.e. though.

But its is not normal to have 4 MIMO layers than drop. The normal approach woudl be to reduce from 4 MIMO layers to 2 MIMO layers and if still overheated then drop.
Not directly from 4 mimo layers to drop.
What is thescgfailure information due to this?
There is no overheating cause in 3GPP for scgfailureinformation.

I think it is chipset constraint to operate above some threshold and auto cut-off occurs in5G modem above a thermal threshold.

Yes at 45 degrees Celsius it cuts the 5G.
Samsung S21 has this problem very annoying reported by lots of users.

Earlier in moto mod 5G had this issue as well .at that time the modem was not integrated but the issue is still there in S10+ S20 modem integrated devices as well.

I am interested in cause of scgfailureinformation to be able to distinguish this drops from real RF drops.

I think these drop cause are dependent on devices, exynos, qc and hisilicon use different ones and communicate this to Nw vendors, i believe.

There was a discussion a little while ago about these causes:

Yes, I am aware of discussion.
But what I wanted to understand is why UE does not send UE assistance information to reduce NR CA or reduce number of layers before dropping the call due to overheating.
Apple has cause t310 expiry for PCI000 for overheating.
Also why UE assistance is missing in logs.
Is it not implemented by RAN vendors and UE vendors?
Has anyone seen UE assistance information RRC messages?

@RFSpecialist “Apple has cause t310 expiry for PCI000 for overheating” → do you have some reference for this?

I have come across multiple UE OEMs , most of do not support using information element, they might trigger using radio link failure with using existing RLF cause codes, this may only clear after looking at UE OEM advirtised info. Which is not available everywhere

On your question, why they do not switch off MIMO and CA…it might not trigger from any one direction like downlink or uplink, this might need some tweaking on UE modem…

Hi experts,
Anyone knows what phones on the market are supporting UE Assistance Information in 5G?

S22 ultra 5G should, it’s the latest one.

It’s also worth to read this :point_up_2:

I think if network requested it then UE suppose to report no dependency over UE.