Flash Report CE UL Congestion

031108_Anduring_3G

Pekanbaru, June 30th 2015

Finding & Analysis :

Found high RRC rejection due to UL CE congestion since 06 June 2015 at 031108_Anduring_3G all sectors. Its impact to CSSR CS/PS degradation.

CE UL utilization still normal, need to check utilization per board for make sure all WBBP board still works.

No site surrounding down which inline with increasing RRC rejection due to UL CE congestion.

Action plan:

Checking WBBP board will be performed.

Problem Review

Availability of surrounding sites:

Details availability:

Utilization Checking per WBBP Board

Finding & Analysis :

Found unbalance CE UL due to degradation at Cabinet No.=0, Subrack No.=0, Slot No.=0 in 3rd June morning and caused increasing rejection due to CE UL cong in busy hour.

Action plan:

Need trial to reset board while performance keep monitored.

If WBBP at Cabinet No.=0, Subrack No.=0, Slot No.=0 still degrade, need trial to swap this WBBP in slot 0 to slot no.2 or to slot no. 3.

If still degrade, need to replace WBBP slot 0.

Troubleshoot # Resetting Board

Remark:

After reset WBBP board performed, WBBP board slot no. 0 still degrade. Need to take the next action plan.

Next action will be performed: Trial to swap this WBBP with slot WBBP slot no. 2 or slot no.3. (Swap WBBP will not be performed for this case due to urgent condition customers too long suffering bad experiences).

So we direct to replace WBBP slot 0.

Troubleshoot # Replacing WBBP

Prediction & Analysis:

Need review candidate sites that will be donor site. CE utilization this site must be safe after donor CE performed.

Surrounding sites of 031108_Anduring_3G are highest priority, but if exact donor in surrounding not found. We need donor from others place.

After CE utilization prediction calculated and coordinated with capacity team, site 030805_Payakumbuh_Barat_3G as exact donor for improve this problem.

Average CE UL utilization before (3WBBP*384=1152) is 21.7259%. If 1 WBBP substracted (2WBBP*384=768). CE UL utilization after is 32.58889819% (prediction). Regarding on the same method, CE DL utilization prediction is 15.84976438%.

CE UL/DL utilization site 030805_Payakumbuh_Barat_3G seems safe after donor WBBP.

Before:

NodeB

Average of

VS.LC.ULCreditAvaila

ble.Shared (number)

Average of

VS.LC.DLCreditAvail

able.Shared

(number)

Average of

VS.LC.ULMax.LicenseGr

oup.Shared (number)

Average of

VS.LC.DLMax.LicenseGr

oup.Shared (number)

Average of

Ul_CE_Utilization (%)

by Measurement

Average of

Dl_CE_Utilization (%)

by Measurement

UL CE

Utilization_by

Formula

DL CE

Utilization_by

Formula

030805_Payakumbuh_Barat_3G 1152 1152 250.2827 121.7262 21.7259 10.5665 21.7259 10.5665

Prediction (After Donor CE):

NodeB

Average of

VS.LC.ULCreditAvaila

ble.Shared (number)

Average of

VS.LC.DLCreditAvail

able.Shared

(number)

Average of

VS.LC.ULMax.LicenseGr

oup.Shared (number)

Average of

VS.LC.DLMax.LicenseGr

oup.Shared (number)

UL CE Utilization

Prediction_by

Formula (%)

DL CE Utilization

Prediction_by

Formula (%)

Remark

030805_Payakumbuh_Barat_3G 768 768 250.2827381 121.7261905 32.58889819 15.84976438 Utilization safe after down grade/donor CE

CE UL Utilization (%) = [VS.LC.ULMax.LicenseGroup.Shared (number)/VS.LC.ULCreditAvailable.Shared (number)]*100

CE DL Utilization (%) = [VS.LC.DLMax.LicenseGroup.Shared (number)/VS.LC.DLCreditAvailable.Shared (number)]*100

Utilization Formula:

NodeB

Nam

e

RN

C

WB

BP

befo

re S

lot

(0,1

,2,3

,4)

WB

BP

Aft

er

Slo

t (0

,1,2

,3,4

)

Configure

d D

L C

E b

efo

re

Configure

d U

L C

E b

efo

re

Configure

d D

L C

E a

fter

Configure

d U

L C

E a

fter

CE

Rem

ark

Board

positio

n t

o u

nplu

g/p

lug

CE

Board

Accepto

r S

ite R

em

ark

Serial num

ber

of

CE

Board

Donor

Rem

ark

030805_Payakumbuh_Barat_3G Huawei_BukitTinggi 3 Board (384,384,-,384,-) 2 Board (384,-,-,384,-) 1152 1152 768 768 Downgrade CE unplug slot 1 031108_Anduring_3G 020QYR10C3001379Need replace WBBP slot

no.0 due to faulty

Utilization of NodeB Donor (030805_Payakumbuh_Barat_3G)

Remark:

After WBBP donored, CE utilization of 030805_Payakumbuh_Barat_3G seems increased.

Increasing CE utilization (especially CE UL utilization) slightly swerve as prediction. But utilization still safe.

Utilization & Performance of NodeB Acceptor (031108_Anduring_3G)

Remark:

After replacing WBBP slot 0, accessibility perfomance already improved.

RRC rejection due to CE UL congestion decreased after WBBP slot 0 replaced.

Its inline with improvement CSSR CS & PS (>98.5%) after WBBP slot no 0 replaced.

Summary

Found CSSR CS & PS degradation in 031108_Anduring_3G due to high RRC Reject due CE UL congestion.

It caused by WBBP slot 0 faulty, trouble shoot was performed to improve this case. After replace WBBP slot 0 replaced, CSSR CS & PS performance already improved and

back to normal.

Thank you