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Power congestion in WCDMA network is very serious problem. Sometimes we observepower congestion in our network for DL or UL or for both.

In Common practice if someone face power congestion they recommend to add powercapability or add new carriers or add new site to resolve power congestion.

But suppose power capability is already reached to max allowed value, we are notable to add new carrier as 2 carriers already implemented on cells o

In such circumstances we can do some parameter optimization to reduce power congestion at worst cells. Here I want to share few such techniques to reduce powercongestion.

Solution for DL Power congestion :

1. Implement DL LDR

Enable DL LDR switch:

MOD UCELLALGOSWITCH: CellId=X, NBMLdcAlgoSwitch= DL_UU_LDR-1;

Modify UCELLLDR parameters:

MOD UCELLLDR: CellId=X, DlLdrFirstAction=CodeAdj, DlLdrSecondAction=BERateRed, DlLdrThirdAction=InterFreqLDHO, DlLdrFourthAction=CSInterRatShouldBeLDHO, DlLdrBERateReductionRabNum=3, GoldUserLoadControlSwitch=ON; (if customer agrees for handover of CS service to 2G in case of congestion in 3G otherwise remove fourth action; if we have single carrier InterFreqLDHO action should be removed from proposal)

2. Modify UCELLLDM Parameters:

MOD UCELLLDM: CellId=X, DlLdrTrigThd=60, DlLdrRelThd=50;

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3. Modify UCELLCAC Parameters:

MOD UCELLCAC:CELLID=X,DLCONVAMRTHD=85,DLCONVNONAMRTHD= 85,DLOTHERTHD=83,DLHOTHD=87,DLCELLTOTALTHD=93;

Solution for UL Power congestion :

1. Implement UL LDR

Enable Switch for UL LDR-

MOD UCELLALGOSWITCH: CellId=X, NBMLdcAlgoSwitch= UL_UU_LDR-1;

Modify LDR parameters-

MOD UCELLLDR:CELLID=X,ULLDRFIRSTACTION=BERateRed,ULLDR SECONDACTION=InterFreqLDHO,ULLDRBERATEREDUCTIONRAB NUM=3; (This is without IRAT for example if customer dont want IRAT even if congestion in 3G; if we have single carrier InterFreqLDHO action should be removed from proposal).

2. Modify UCELLLDM Parameters:

MOD UCELLLDM:CELLID=X,ULLDRTRIGTHD=55,ULLDRRELTHD=45;

3. Modify UCELLCAC Parameter :

MOD UCELLCAC:CELLID=X,ULTOTALEQUSERNUM=160;

Can also try to change few more UCELLCAC parameters:

MOD UCELLCAC: CellId=X, UlNonCtrlThdForAMR=85, UlNonCtrlThdForNonAMR=85, UlNonCtrlThdForOther=83, UlNonCtrlThdForHo=87, UlCellTotalThd=93,

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I hope this information may be useful in handling such issues in your projects.

Feel free to contact me for queries and further discussion.

Note: Please remember that at a time change one parameter type and monitor the performance if required then go for other parameter changes. This activity shouldbe done in steps. Not recommended to change all the parameters at a time to resolve the congestion.