View Full Version : DL 4x4MIMO is not working
hamody2005
2022-08-07, 08:10 AM
Dear Expert,
4x4 MIMO is enabled in HW eNB and CFG parameter and licenses are ok, but KPI related to Rank3 & Rank4 shows no PRB are assigned to them.
Could you advise?
DANORM
2022-08-07, 03:21 PM
which frequency?
hamody2005
2022-08-08, 12:56 AM
it's on Band28
and BW is 10M
punto
2022-08-08, 08:32 PM
Is cabling on antenna correct, no crossed feeders ?
DANORM
2022-08-09, 03:30 AM
most probably UE does not support of 4T4R for that band
it's on Band28
and BW is 10M
hamody2005
2022-08-10, 07:44 AM
Is cabling on antenna correct, no crossed feeders ?
yes, ok connected
hamody2005
2022-08-10, 08:17 AM
most probably UE does not support of 4T4R for that band
UE support 4x4 Samsung Note9
DANORM
2022-08-10, 07:20 PM
That does not work for Band28. Its working on other bands.
UE support 4x4 Samsung Note9
hamody2005
2022-08-11, 04:03 AM
That does not work for Band28. Its working on other bands.
from capability ifound this for band 28 "messagesupportedMIMO-CapabilityDL-r10 = twoLayers"
Does it means it's only 2x2 or its for CA only.
subway
2022-08-11, 06:09 AM
I have not seen a single UE that has 4x4 below band 3. Sub-1GHZ is definitely 2x2, but on the RAN side it is similar. Even the dual or triple-band RRUs (ZTE for example) has 4 RX, but only 2 TX per band on combined ports.
But you can attach the full UE capab here, and we can take a look.
mounir34
2022-08-14, 03:41 AM
Hello,
which license have you checked my friend ?
Dear Expert,
4x4 MIMO is enabled in HW eNB and CFG parameter and licenses are ok, but KPI related to Rank3 & Rank4 shows no PRB are assigned to them.
Could you advise?
hamody2005
2022-08-15, 07:38 AM
Hello,
which license have you checked my friend ?
All licenses related to 4x4
4x4MIMO, BB Tx/Rx channel, RF Tx/Rx channel
hamody2005
2022-08-16, 12:26 AM
I have not seen a single UE that has 4x4 below band 3. Sub-1GHZ is definitely 2x2, but on the RAN side it is similar. Even the dual or triple-band RRUs (ZTE for example) has 4 RX, but only 2 TX per band on combined ports.
But you can attach the full UE capab here, and we can take a look.
Please see attached file, which is for Note9, but from message it's Cat4
auto_art
2022-08-16, 04:59 AM
cat 4 only can 2 layers.
UL AND DL PARAMETERS FOR LTE UE CATEGORIES 1 – 5
LTE CATEGORY
PARAMETER
LTE CAT 1
LTE CAT 2
LTE CAT 3
LTE CAT 4
LTE CAT 5
Max number of DL-SCH transport block bits received in a TTI
10 296
51 024
102 048
150 752
302 752
Max number of bits of a DL-SCH block received in a TTI
10 296
51 024
75 376
75 376
151 376
Total number of soft channel bits
250 368
1 237 248
1 237 248
1 827 072
3 667 200
Maximum number of supported layers for spatial multiplexing in DL
1
2
2
2
4
Max number of bits of an UL-SCH transport block received in a TTI
5 160
25 456
51 024
51 024
75 376
Support for 64-QAM in UL
No
No
No
No
Yes
hamody2005
2022-08-16, 06:34 AM
cat 4 only can 2 layers.
UL AND DL PARAMETERS FOR LTE UE CATEGORIES 1 – 5
LTE CATEGORY
PARAMETER
LTE CAT 1
LTE CAT 2
LTE CAT 3
LTE CAT 4
LTE CAT 5
Max number of DL-SCH transport block bits received in a TTI
10 296
51 024
102 048
150 752
302 752
Max number of bits of a DL-SCH block received in a TTI
10 296
51 024
75 376
75 376
151 376
Total number of soft channel bits
250 368
1 237 248
1 237 248
1 827 072
3 667 200
Maximum number of supported layers for spatial multiplexing in DL
1
2
2
2
4
Max number of bits of an UL-SCH transport block received in a TTI
5 160
25 456
51 024
51 024
75 376
Support for 64-QAM in UL
No
No
No
No
Yes
Thanks , but from Samsung website Note9 is not cat4 "Faster capability in comparison to any other smartphone without a Cat. 18 modem"
joaoo
2022-08-17, 07:51 AM
Perfectly normal, I only know 2 phones in the world that support 4x4 in B28, the Sony Xperia 1 (J9110) and Sony Xperia 1III (XB-BC52).
DANORM
2022-08-17, 03:07 PM
Do they support B20 4T4R?
Perfectly normal, I only know 2 phones in the world that support 4x4 in B28, the Sony Xperia 1 (J9110) and Sony Xperia 1III (XB-BC52).
joaoo
2022-08-23, 01:07 AM
Yes, they suport B20, B28 and also B8 with 4T4R.
subway
2022-08-24, 08:54 PM
This phone does not support 4x4 on band 20 or 28 for sure.
Non the less, the fact the modem is Cat4, that does not mean it cannot have 4 receive chains. It can, but not for MIMO (spatial multiplexing), but for simple diversity combining. The UE category only limits the spatial stream number, not the actual receive chain number. :)
RF_Blida
2022-09-27, 10:24 PM
vérifier le type de votre UE s'il prend en charge 4T4R
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