Can we shift uplink volume or uplink traffic of NR to LTE in option 3.x?

5G NR
,
1

Hi Experts,
Can we shift uplink volume or uplink traffic of NR to LTE in option 3.x?
Through x2-u?

2

Yes, you can.
Huawei can do this: share the traffic as per customer need between NR and LTE, for both UL and DL.

3

Which parameter please?

4

Also requires UE support UL split.

5

We have parameter for DL data path and UL data path option in ENDC.
Generally for UL we kept UL over NR and LTE.
Due to less UL range in NR.

6

Any threshold to set?

7

There are tens of them. :wink:
Best is to chekc HEDEX 5G (if Huawei).
And there is “NSA networking based on EPC” there you will find all settings.
This is all split at PDCP layer.

8

Uplink Fallback to LTE
Associated parameters
CellQciPara.NsaDcDefaultBearerMode- SCG_SPLIT_BEARER or MCG_SPLIT_BEARER
UL_FALLBACK_TO_LTE_SWITCH option of the NRCellNsaDcConfig.NsaDcAlgoSwitch
Option 3x:
If the uplink NR SINR is less than NRDUCellSrsMeas.NsaUlFackToLteSinrThld minus NRDUCellSrsMeas.NsaUlFackToLteSinrHyst for five consecutive times at an interval specified by NRDUCellSrsMeas.NsaUlToLteSinrTimeToTrig, the gNodeB triggers a change in the uplink data split mode by sending an SgNB Modification Required message to the eNodeB. The eNodeB instructs the UE to transmit data on the LTE side by sending an RRC connection reconfiguration message to the UE.
If the uplink NR SINR is greater than NRDUCellSrsMeas.NsaUlFackToLteSinrThld plus NRDUCellSrsMeas.NsaUlFackToLteSinrHyst for five consecutive times at an interval specified by NRDUCellSrsMeas.NsaUlToLteSinrTimeToTrig, the gNodeB triggers a change in the uplink data split mode by sending an SgNB Modification Required message to the eNodeB. The eNodeB instructs the UE to use the original uplink data split mode by sending an RRC connection reconfiguration message to the UE.