CA band combination not present in UE capability message

4G LTE
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1

Dears, I noted an issue.

When UE report capability msg in LTE, sometimes msg size is large and contain all CA combination.

And other times this message do not contain any CA band combination.

That final issue cause UE use single carrier instead of CA so throughput degraded.

Any solution for that issue?

Vendor is Huawei.

Admin note: this post was updated with image below.

cacombos
cacombos1470×540 123 KB

2

Check that one, can help.

5.6.3.3 “Reception of the UECapabilityEnquiry by the UE” in 3GPP TS 36.331 V13.1.0

image
image1600×379 96.2 KB

3

Hi All,

As per “cacombos”, I can see Samsung S23 device support 3CC NR CA between n28_n78_n78.

But when checked in actual UE capability in L3 logs, UE only reporting n28_n78 2CC CA.

What could be the reason?

Actual device model- Samsung Galaxy S23 Ultra (SM-S918B)

4

“cacombos” value is different country by country, operator per operator.

This is why sometime for one phone you see different links for different operators.

Here is an example:

cacombos
cacombos1470×540 123 KB

5

But every model number is different here.

I am checking first model only (SM-S918B) in cacombos and in actual UE capability which is not matching.

6

S918B is generic name for not branded per operator

I also checked and I do not even see N28_n78 but I seen78_n28:

image
image1600×1140 167 KB

So I guess It is important which one is the Pcell.

7

Which model you filtered?

8

S918B

9

You have to put proper format.

As per website it support this band combination.

But UE not reporting.

10

But UE reports what network instructs to report, not all bands.

Did network instruct the UE to report n78 and n28 and UE did not report it?

11

In NSA max 2 carriers as far as I know.

This 3CC should be for SA.

12

Yes gNB enquiry is ok.

              appliedFreqBandListFilter {
                bandInformationNR : {
                  bandNR 78
                 },
                bandInformationNR : {
                  bandNR 28
                 }
               },

But issue is UE only reporting only below 2 combinations.

supportedBandCombinationList {
                {
                 bandList {
                  nr : {
                    bandNR 28,
                    ca-BandwidthClassDL-NR a
                   },
                  nr : {
                    bandNR 78,
                    ca-BandwidthClassDL-NR a,
                    ca-BandwidthClassUL-NR a
                   }
                 },
                 featureSetCombination 0,
                 ca-ParametersNR {
                  simultaneousRxTxInterBandCA supported
                 },
                 supportedBandwidthCombinationSet '11'B,
                 powerClass-v1530 pc2
                },
                {
                 bandList {
                  nr : {
                    bandNR 28,
                    ca-BandwidthClassDL-NR a,
                    ca-BandwidthClassUL-NR a
                   },
                  nr : {
                    bandNR 78,
                    ca-BandwidthClassDL-NR a
                   }
                 },

While older S22 devices are reporting many 2CC combination between n78 and n28.

But S23 not reporting.

Strange.

13

Strange indeed.