UL RSSI Football Stadium challenge

[Muhammad Imran Rafique]

Hi Experts,
We are facing big degradation for our stadium in UL RSSI, it is being served by 6 RBS having 3 sectors each.
In 3G we have 3 carriers on W2100, due to high # of smartphones there is very high UL RSSI (~-60 in busy hours). Please share your experience.


W13B, E//

BR//
Imran

[electron]

Hi Experts,
We are facing big degradation for our stadium in UL RSSI, it is being served by 6 RBS having 3 sectors each.
In 3G we have 3 carriers on W2100, due to high # of smartphones there is very high UL RSSI (~-60 in busy hours). Please share your experience.


W13B, E//

BR//
Imran

Hi,

Share your especial event handling parameters you implemented for these sites.

CHeers

[Muhammad Imran Rafique]

Hi Electron,

here it is


MO Parameter Default Recommneded Value Aggressive Value Congestion reason
UtranCell eulServingCellUsersAdmTti2 8 4 0 High RSSI
UtranCell maxTxPowerUl 24 21 21 High RSSI
UtranCell sf8Adm 8 2 0 Code,Power&RSSI
UtranCell sf4AdmUl 4 2 0 Code,RSSI
UtranCell sf16Adm 16 8 0 Code rejection
UtranCell sf8AdmUl 8 8 2 Code rejection
UtranCell eulDchBalancingEnabled 0 1 1 High RSSI
UtranCell eulDchBalancingLoad 50 100 200 High RSSI
UtranCell eulDchBalancingOverload 0 4 10 High RSSI
UtranCell eulDchBalancingReportPeriod 200 600 600 High RSSI
UtranCell eulLoadTriggeredSoftCong 0 1 1 High RSSI
UtranCell directedRetryTarget N/A Co Gsm Cell N/A Power rejection
UtranCell loadSharingGsmThreshold 75 50 30 Power rejection
UtranCell compModeAdm 15 20 25 SHO failer
UtranCell dlCodeAdm 80 90 95 Code rejection
UtranCell hsdpaUsersAdm 48 60 64 Hs users rejection
UtranCell eulServingCellUsersAdm 28 30 32 Eul users rejection
UtranCell minPwrRl -120 -150 -200 Power rejection
UtranCell pwrAdm 84 90 95 Power rejection
UtranCell pwrOffset 15 9 4 Power rejection
UtranCell rateSelectionPsInteractive ulPrefRate & DlPrefRate 64/64 16/16 8/8 Code,RSSI
UtranCell sInterSearch 21 0 0 Balance traffic
UtranCell usedFreqThresh2dEcno -15 -14 -13 Shrink 3G coverage
UtranCell usedFreqThresh2dRscp -105 -102 -100 Shrink 3G coverage
UtranCell constantValueCprach -19 -24 -27 High RSSI
UtranCell tmCongAction 2000 3000 High RSSI
UtranCell tmCongActionNg 800 1000 High RSSI
UtranCell CPICH default design decrease according to power congestion More decrease Power rejection
UtranCell hsdschInactivityTimer 3 1 1 Hs users rejection
UtranCell inactivityTimer 7 5 5 Fach congestion
UtranCell sRatSearch 2 4 6 Shrink 3G coverage
UtranCell spreadingFactor 64 32 32 High RSSI
UtranCell URAref Defined N/A N/A High PS drop
UtranCell CoverageRelation , relationCapability , dchLoadSharing|Hsloadsharing 0 1 1 Balance traffic
RBS eulMaxOwnUuLoad 80 150(to increase Thrpt per user) 50(to decrease Interference but will decrease Thrpt per user) High RSSI
RBS eulMaxRotCoverage 100 150(to increase Thrpt per user) 50(to decrease Interference but will decrease Thrpt per user) High RSSI
RBS hsPowerMargin 2 1 0 Power rejection
RBS queueSelectAlgorithm 4 1 1 enhance throughput
IubLink ulHwAdm 95 98 99 UL CE rejection
IubLink dlHwAdm 95 98 99 DL CE rejection
UtranCell admBlockRedirection/gsmRrc 0 1 1 Balance traffic
RBS eulMaxAllowedSchRate 3968 1024 N/A High RSSI
RBS eulMaxShoRate 5760 1024 N/A High RSSI
RBS eulNonServHwRate 160 32 N/A High RSSI
RBS eulTargetRate 160 64 N/A High RSSI

[electron]

Hi Electron,

here it is


MO Parameter Default Recommneded Value Aggressive Value Congestion reason
UtranCell eulServingCellUsersAdmTti2 8 4 0 High RSSI
UtranCell maxTxPowerUl 24 21 21 High RSSI
UtranCell sf8Adm 8 2 0 Code,Power&RSSI
UtranCell sf4AdmUl 4 2 0 Code,RSSI
UtranCell sf16Adm 16 8 0 Code rejection
UtranCell sf8AdmUl 8 8 2 Code rejection
UtranCell eulDchBalancingEnabled 0 1 1 High RSSI
UtranCell eulDchBalancingLoad 50 100 200 High RSSI
UtranCell eulDchBalancingOverload 0 4 10 High RSSI
UtranCell eulDchBalancingReportPeriod 200 600 600 High RSSI
UtranCell eulLoadTriggeredSoftCong 0 1 1 High RSSI
UtranCell directedRetryTarget N/A Co Gsm Cell N/A Power rejection
UtranCell loadSharingGsmThreshold 75 50 30 Power rejection
UtranCell compModeAdm 15 20 25 SHO failer
UtranCell dlCodeAdm 80 90 95 Code rejection
UtranCell hsdpaUsersAdm 48 60 64 Hs users rejection
UtranCell eulServingCellUsersAdm 28 30 32 Eul users rejection
UtranCell minPwrRl -120 -150 -200 Power rejection
UtranCell pwrAdm 84 90 95 Power rejection
UtranCell pwrOffset 15 9 4 Power rejection
UtranCell rateSelectionPsInteractive ulPrefRate & DlPrefRate 64/64 16/16 8/8 Code,RSSI
UtranCell sInterSearch 21 0 0 Balance traffic
UtranCell usedFreqThresh2dEcno -15 -14 -13 Shrink 3G coverage
UtranCell usedFreqThresh2dRscp -105 -102 -100 Shrink 3G coverage
UtranCell constantValueCprach -19 -24 -27 High RSSI
UtranCell tmCongAction 2000 3000 High RSSI
UtranCell tmCongActionNg 800 1000 High RSSI
UtranCell CPICH default design decrease according to power congestion More decrease Power rejection
UtranCell hsdschInactivityTimer 3 1 1 Hs users rejection
UtranCell inactivityTimer 7 5 5 Fach congestion
UtranCell sRatSearch 2 4 6 Shrink 3G coverage
UtranCell spreadingFactor 64 32 32 High RSSI
UtranCell URAref Defined N/A N/A High PS drop
UtranCell CoverageRelation , relationCapability , dchLoadSharing|Hsloadsharing 0 1 1 Balance traffic
RBS eulMaxOwnUuLoad 80 150(to increase Thrpt per user) 50(to decrease Interference but will decrease Thrpt per user) High RSSI
RBS eulMaxRotCoverage 100 150(to increase Thrpt per user) 50(to decrease Interference but will decrease Thrpt per user) High RSSI
RBS hsPowerMargin 2 1 0 Power rejection
RBS queueSelectAlgorithm 4 1 1 enhance throughput
IubLink ulHwAdm 95 98 99 UL CE rejection
IubLink dlHwAdm 95 98 99 DL CE rejection
UtranCell admBlockRedirection/gsmRrc 0 1 1 Balance traffic
RBS eulMaxAllowedSchRate 3968 1024 N/A High RSSI
RBS eulMaxShoRate 5760 1024 N/A High RSSI
RBS eulNonServHwRate 160 32 N/A High RSSI
RBS eulTargetRate 160 64 N/A High RSSI

Hi,

I checked your shared settings and actually -60 is very much abnormal. In this situation if we assume all of this ROT is due to users activity then maxUuLoad and ROTCOVERAGE increment is wrong decision (keep it as default only not reduce it also) u have to forget EUL Thr for the event. Secondly u did not mention number of HSDPA and EUL users from RBS side. Maybe due to wrong/low setting there is huge spill over to R99. What resource congestion you observe more(DL Pwr, DL Code, UL/CL CE )?

You may try IGR related parameters also to avoid high R99 usage .

Activating Interference suppression might help as well in this scenario

Share Open Loop PC setting maybe it require to be changed to bring down preamble power to slightly improve UL RSSI (Play with constantCpRach)

sirMaxTti setting also might be reviewed during the event


Cheers

[Ralphobafemi]

Hi.
Though your question is for E// eqipment, i will share a few tips For ALU equipment users:
UL Load managment for events:
1. Reduce the ReferenceRTWP from -106.1 to -99.0dBm (BTSEquipment/BTSCell and NodeBFDDCell)
2. Reduce ConstantValue from default -17 to -21 (to fine tune mobile output power)
3. Reduce SibMaxAllowedTxPoweronRach from 24 to 18 for pilot cells.

Hope this helps.
RalphObafemi
++ReputationPlease

[Muhammad Imran Rafique]

Hi Ralphobafemi,

related to point01: if we will reduce ReferenceRTWP, you don't think we will not leave any room for schedule in such high UL RSSI environment. and how it will have impact, please explain.

Related to point03: SibMaxAllowedTxPoweronRach, what is this parameter and how it will help in reducing UL RSSI issue.