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IRAT Activity Ratio

Improvements Actions

3G Strategy Team

8/16/2019 IRAT Activity Ratio_NSN

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NPO PROJECT

Parameter Description1- Improve CS IRAT handover target threshold, and physical channel failure penaltyparameter, this will reuire CS IRA! !" happen in 2# uality good

 TargetRatCsThd $ Inter-RAT !andover %ased on Coverage&uality reuirement for the cell of another RAT during inter-RAT CS handovers

 The setting of this parameter a'ects num(er of hard handovers) If small value, hardhandovers are li*ely to (e triggered, (ut ping-pong handovers may occur) If large valuehard handovers are unli*ely to (e triggered, (ut call drops may occur) Actual +alue #+alue - 111.1/-111-0 change to -1

InterRat3hyCh4ail5um $ 6a7imum num(er of inter-RAT handover failures allowed duephysical channel failure

 The smaller the value, the greater the num(er of users who cannot (e promptly handover to a 2# networ*) The larger the value ,the less e8cient the penalty)

3enaltyTime4or3hyCh4ail9s. $ :ength of a penalty timer for inter-RAT handover failuredue to physical channel failures

  The larger the value of this parameter, the greater the num(er of users who cannotpromptly handed over to a 2# networ*) The smaller the value of this parameter, the lese8cient the penalty)

R5C :evel$S?=>@

Cell :evel$A C

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NPO PROJECT

2- Improve time delay for triggering handovers to #S6 cells with veried %SIC, thisreduce the impact of 2# signal Ductuate

 

InterRAT3eriodReportInterval9ms. $ Interval that the < reports intermeasurement results to the R5C

 The setting of this parameter has impact on the u signaling tra8c) If this paramvalue is too small, the period is too short and the reporting freuency is too high, the will have high load in processing signaling) If this parameter value is too large, the peritoo long and therefore the networ* cannot detect the signal changes in time, whichdelay the inter-RAT handover and thus cause call drops) TimeToTrig4or+erify9ms. $ Time delay for triggering handovers to #S6 cells with ver

%SIC This parameter, together with the hysteresis, prevents false decisions caused (y s

 Eitters during the inter-RAT handover decision) Setting this parameter to a larger valueresult in fewer handovers, a stronger capa(ility of preventing momentary sDuctuations, and a lower pro(a(ility of false trigger) !owever, the call drop rate increas

 R5C :evel$S>?>@Cell :evel$A C

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