Hi Experts,
When 4T4R MIMO configuration is set in 4G network and HW also is 4 feeders per antenna but no rank 4 and 3, what is problem?
Cell.TxRxMode = 4T4R
Cell.CrsPortNum = CRS_PORT_4
Cell.CrsPortMap = 4T4P_0321
CellDlschAlgo.MaxMimoRankPara = SW_MAX_RAN_4
eNodeBAlgoSwitch.CompatibilityCtrlSwitch = Tm3Tm4Max4LayerCtrlSwitch
When I check Dsp VSWr , it has value for feeders.
Cell dlschalgo make as sw_rank4.
If your RRU support 4T4R.
Yes, RRU support.
Yes, all settings is ok.
Please check connection RU - antenna physical ports.
Check MIMO cabling.
If wrong cabling you will not get rank 3.
Rank4 is anyway less than 5% of samples.
If we have RU issue, we should have VSWR alarm, no?
(No VSWR observed in the case).
port A should go to +45 and port B to -45 another antenna.
Similar you should check for C and D.
Thanks. 
How we can check this?
Go on site and check cabling.
Or from OSS I think there is a way… (but i don’t know the commands)
In Ericsson for Radio 4415 we received no alarm. Some times we have just two configure port(on site issue). You can arrange audit to check it and also please check RF branches configuration
TM3TM4MAX4LAYERCTRLSWITCH@COMPATIBILITYCTRLSWITCH , this switch must be set to 1 . This is Enode B level switch , you can found it in ENODEBALGOSWITCH
Check Rssi of each port, it should not have main diversity issue.
Check if 2rru is cascaded and one rru is down.
Check for cross feeder
Check any abnormals for that cell
Most probably that’s 4T4R on Low band ?
Because there’s no devices support 4T4R on Low Band .
UE should be support 4 Receivers
we had this cabling issue under antenna ( +45 , -45 ) and rank issue on our site .
Thanks
No device supports 4T4R in low band
we had this issue too and it solved
There is few devices support low band 4x4. Xperia 1 and Xperia 5 example support low band 4x4: Sony Xperia 1 (J9110) | 4G/5G Bands & Combos
