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Enabling LDR Algorithms to reduce the CE congestion case Initial

Author Hu Mingchao ID 114879

Representative UMTS RNP Product RNP&RNO

Date 2009-08-25 Version

(VxxxRxxxCxxxBx

xx)

RNC V200R010C01B061

Checked by

Name Enabling LDR Algorithms to reduce the CE congestion case

Phenonem

a

HSPA user increased so many in one UMTS Network after launch. And some sitesappear CE Congestion for the uplink.RN

CID

CellId Time(As

day)

VS.RRC.At

tConEst.Ce

ll

VS.RRC.Succ

ConnEstab.Ce

ll.Rate

VS.RRC.SuccC

onnEstab.Servic

e.Cell.Rate

VS.RRC.SuccCo

nnEstab.Other.Ce

ll.Rate

VS.RRC.Rej.U

L.CE.Cong

RRC Setup

Block Rate due

to the UL CE

Congestion

22 52851 2009-5-11 12558 96.83% 97.55% 96.12% 155 1.23%

22 52852 2009-5-11 12054 96.08% 96.35% 95.83% 117 0.97%

22 52853 2009-5-11 5408 96.22% 96.74% 95.37% 252 4.66%

Alarm None.

Cause In order to reduce the UL CE congestion, we suggest that customers expand the CE.But they didnt want to buy more CE license right now.

So we use the algorithm optimization to reduce the CE congestion in a short target. It

should be enable the hot traffic site WMEC1 and check the performance after enable

the LDR algorithms base on the CE.Algorithm Switches need to be enabled

Cell LDC algorithm

switch

Load control algorithm switch NodeB LDC algorithm switch

Type A CELL_CREDIT_LDR LC_CREDIT_LDR_SWITCH -

Type C - NODEB_CREDIT_LDR_SWITCH NODEB_CREDIT_LDR

Process 1How to set the LDR algorithms:

a) ADD NODEBALGOPARA: NodeBLdcAlgoSwitch=NODEB_CREDIT_LDR-1;

(NodeB Level)

b) SET LDCALGOPARA: LdcSwitch=NODEB_CREDIT_LDR_SWITCH-1; (NodeB

level)

c) ADD CELLALGOSWITCH: NBMLdcAlgoSwitch=CELL_CREDIT_LDR-1; (Cell

level)

2If we enable the LDR algorithms, and DCCC Algorithm should be enable at the same time.

How to set the DCCC algorithms:

a) SET CORRMALGOSWITCH: ChSwitch=DCCC_SWITCH-1; (RNC level)

b) BE service reduction: ADD CELLLDR: CellId=11111,

UlLdrFirstAction=BERateRed, UlLdrSecondAction=NoAct;

3. We Enable the LDR algorithms At 2009-5-11 21:30.

1). RRC Setup Compare

The following table shows us the RRC Setup Block rate decreased and also the RRC Setup success

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7/28/2019 WCDMA Huawei Enabling LDR Algorithms to Reduce the CE Congestion Case

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Enabling LDR Algorithms to reduce the CE congestion case Initial

rate increased after the enabling the LDR algorithm by CE congestion.

RNCID

CellId Time(Asday)

VS.RRC.AttConEst.Cell

VS.RRC.SuccConnEstab.Cell.Rate

VS.RRC.SuccConnEstab.Service.Cell.Rate

VS.RRC.SuccConnEstab.Other.Cell.Rate

VS.RRC.Rej.UL.CE.Cong

RRC SetupBlock Rate dueto the UL CECongestion

22 52851 2009-5-11 12558 96.83% 97.55% 96.12% 155 1.23%22 52852 2009-5-11 12054 96.08% 96.35% 95.83% 117 0.97%

22 52853 2009-5-11 5408 96.22% 96.74% 95.37% 252 4.66%

22 52851 2009-5-12 6747 97.98% 98.22% 97.79% 27 0.40%

22 52852 2009-5-12 11383 98% 98.57% 97.43% 30 0.26%

22 52853 2009-5-12 11879 97.82% 98.10% 97.35% 56 0.47%

2). PS RAB Setup Success Rate compare

The following PS RAB Block rate due to the UL CE congestion rate get low than before.

And the PS RAB Setup Fail times due to the UL CE congestion get less than before.

RNCID

CellId Time(Asday)

VS.RAB.FailEstabPS.Cell

VS.RAB.AttEstabPS.Cell

VS.RAB.FailEstPs.ULCE.Cong

PS RAB Block Rate DueTo the UL CE Congestion

22 52851 2009-5-11 2284 7404 289 3.90%

22 52852 2009-5-11 1554 3471 258 7.43%

22 52853 2009-5-11 4460 9914 598 6.03%

22 52851 2009-5-12 3225 7055 73 1.03%

22 52852 2009-5-12 2385 4845 41 0.85%

22 52853 2009-5-12 6658 11887 158 1.33%

3). When enable the LDR algorithms base on the UL CE, the BE Service bits rate reduce times.

The following table show us when the LDR algorithms base on the UL CE work normally.

Notes: Until now only enable the algorithms to reduce the BE service bits rate in UL.

RNCID CellId Time(As day) VS.LCC.LDR.BERateUL

22 52851 2009-5-11 0

22 52852 2009-5-11 0

22 52853 2009-5-11 0

22 52851 2009-5-12 1613

22 52852 2009-5-12 195

22 52853 2009-5-12 15

SuggestandSummary

LDR algorithms work normally and reduce the UL CE consumption.

LDR algorithms base on the CE only can avoid the basic congestion in

WCDMA system. For heavy congestion sites such as the WMEC1, LDR

algorithms base on the CE can not clear up the all CE congestion.

HUAWEI recommend operator to expand the hardware capacity to avoid the

CE congestion at all.

Attached

Others:

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