Return time to LTE

[bedez]

Dear Masters,

I have problem return time 3G to LTE takes long (>10s). Already checked parameters related fast return to lte has activated, eutranfreqrelation created, redirection order set 2, threshigh set 8.


Is return time 3G to lte affected by utrancellrelation from lte to 3G?
If 3G relation to lte have more than 1 eutranfrequency relation, is it impact to return time to lte?
This problem actualy occur on new RNC, any parameter on lte could be set regarding new RNC?


Thank you very much for any explanation.

[BENRHOUMASALEM]

what is the vendor ?

[abeloufa]

did you check all related SIB19 parameters?
let us assume that QrxlevminEutran is set to -124 than threshigh as you montionne is set to 8 (16dB) than reselection will be done if RSRP is greter than -108 which is so late.
one more thing check SIB19 priority (RNC level) which is used by the scheduling algorithm in the RNC to give precedence to the SIB.

[live_energy]

Dear Masters,

I have problem return time 3G to LTE takes long (>10s). Already checked parameters related fast return to lte has activated, eutranfreqrelation created, redirection order set 2, threshigh set 8.


Is return time 3G to lte affected by utrancellrelation from lte to 3G?
If 3G relation to lte have more than 1 eutranfrequency relation, is it impact to return time to lte?
This problem actualy occur on new RNC, any parameter on lte could be set regarding new RNC?


Thank you very much for any explanation.

WRFD-140226 Fast Return from UMTS to LTE
The license for the Fast Return from UMTS to LTE feature has been activated on the RNC side.

(Optional) In RAN sharing or MOCN scenarios, run the RNC MML command SET LICENSE. In this step, set the value of Fast Return from UMTS to LTE-Erlang and Fast Return from UMTS to LTE-kbps for the primary and secondary operators.
Run the RNC MML command ADD UCELLSELRESEL or MOD UCELLSELRESEL. In this step, set Absolute priority level of the serving cell to an appropriate value.
Run the RNC MML command ADD UCELLNFREQPRIOINFO or MOD UCELLNFREQPRIOINFO. In this step, set E-UTRA Absolute Radio Frequency Channel Number and Absolute Priority Level of the E-UTRA Frequency to appropriate values.
NOTE:
The value of Absolute priority level of the serving cell must be less than that of Absolute Priority Level of the E-UTRA Frequency.


Activate the feature at the cell and RNC levels as follows:
At the cell level:
Run the RNC MML command ADD UCELLHOCOMM or MOD UCELLHOCOMM and select the HO_UMTS_TO_LTE_FAST_RETURN_SWITCH check box under the Fast Return To LTE Switch parameter to enable the UMTS-to-LTE Fast Return function.
Run the RNC MML command ADD UCELLHOCOMM or MOD UCELLHOCOMM and select the PERFENH_PS_FAST_RETURN_LTE_SWITCH check box under the Fast Return To LTE Switch parameter to enable the Enhanced UMTS-to-LTE Fast Return function.
At the RNC level:
Run the RNC MML command SET UCORRMALGOSWITCH and select the HO_UMTS_TO_LTE_FAST_RETURN_SWITCH check box under the HandOver Switch parameter to enable the UMTS-to-LTE Fast Return function.
Run the RNC MML command SET UCORRMPARA and select the PERFENH_PS_FAST_RETURN_LTE_SWITCH check box under the Performance Enhancement Switch 3 parameter to enable the Enhanced UMTS-to-LTE Fast Return function.
NOTE:
In the preceding configurations, cell-level configurations take precedence over RNC-level configurations.
If the extended LTE frequency band including EARFCNs 26 to 31 is supported, run the RNC MML command SET UALGORSVPARA with RESERVED_SWITCH_9_BIT27 under the Reserved Switch 9 parameter selected.
Run the RNC MML command SET UALGORSVPARA with RESERVED_SWITCH_9_BIT28 selected under Reserved Switch 9 to support filtering of frequencies according to UE capabilities during fast return.


MML Command Examples


//Setting the number of Fast Return from UMTS to LTE-Erlang of all operators and the number of Fast Return from UMTS to LTE-kbps of all operators in RAN sharing or MOCN scenarios
SET LICENSE: SETOBJECT=UMTS, OperatorType=PRIM, U2LFastReturnErl=1000, U2LFastReturnKbps=100000;
SET LICENSE: SETOBJECT=UMTS, OperatorType=SEC, U2LFastReturnErl=1000, U2LFastReturnKbps=100000;
//Configuring the absolute priority of a cell
MOD UCELLSELRESEL: CellId=1, SPriority=4;
//Configuring E-UTRA Absolute Radio Frequency Channel Number and Absolute Priority Level of the E-UTRA Frequency for the cell
ADD UCELLNFREQPRIOINFO: CellId=1, EARFCN=1000, NPriority=7, ThdToHigh=2,
ThdToLow=2, EMeasBW=D6, EQrxlevmin=-70, EDetectInd=TRUE,
BlacklstCellNumber=D0;
//Activating the feature and enabling the feature enhancement at the cell level
MOD UCELLHOCOMM:CellId=1,FastReturnToLTESwitch= HO_UMTS_TO_LTE_FAST_RETURN_SWITCH-1& PERFENH_PS_FAST_RETURN_LTE_SWITCH-1
//Activating the feature and enabling the feature enhancement at the RNC level
SET UCORRMALGOSWITCH: HoSwitch=HO_UMTS_TO_LTE_FAST_RETURN_SWITCH-1;
SET UCORRMPARA: PerfEnhanceSwitch3= PERFENH_PS_FAST_RETURN_LTE_SWITH-1;
//When the extended LTE frequency band including EARFCNs 26 to 31 is supported
SET UALGORSVPARA: RsvSwitch9=RESERVED_SWITCH_9_BIT27-1;
//Filtering LTE frequencies according to UE capabilities
SET UALGORSVPARA: RsvSwitch9=RESERVED_SWITCH_9_BIT28-1;

[muctimonline]

Dear Masters,

I have problem return time 3G to LTE takes long (>10s). Already checked parameters related fast return to lte has activated, eutranfreqrelation created, redirection order set 2, threshigh set 8.


Is return time 3G to lte affected by utrancellrelation from lte to 3G?
If 3G relation to lte have more than 1 eutranfrequency relation, is it impact to return time to lte?
This problem actualy occur on new RNC, any parameter on lte could be set regarding new RNC?


Thank you very much for any explanation.

In my opinion, we should care about re selection/redirection procedure.
1st : Make sure UE in Idle mode ?
2nd : CHeck SIB19 parameter
3rd : threshold for re selection/redirection

[visible]

Dear Masters,

I have problem return time 3G to LTE takes long (>10s). Already checked parameters related fast return to lte has activated, eutranfreqrelation created, redirection order set 2, threshigh set 8.


Is return time 3G to lte affected by utrancellrelation from lte to 3G?
If 3G relation to lte have more than 1 eutranfrequency relation, is it impact to return time to lte?
This problem actualy occur on new RNC, any parameter on lte could be set regarding new RNC?


Thank you very much for any explanation.

Please check and confirm releaseRedirect is set to 1. also redirectionOrder set to 1.

>>> 1.csFallbackCsRelease = 1 (ON)
>>> 2.csFallbackDchToFach = 1 (ON)
>>> 3.dchToFach = 1 (ON)
>>> 4.fachToUra = 1 (ON)
>>> 5.fastDormancy = 1 (ON)
>>> 6.normalRelease = 0 (OFF)

Let me know incase u still face same problem.