VfUK_NodeBCapacity

NodeB Capacity AuditVDF UK Golden RNC EH4 VDF UK Golden RNC EH4

Eric Juillot, NDIO

version 1.0, 27 July 2010

Agenda

1. Overview

2. BH Definition

3. Node B Capacity Assessment Methodology

1. CPULoad_CCM & CPULoad_CEM

2. CEM R99 Capacity Assessment

3. CEM HSXPA Capacity Assessment

4. HSDPA OVSF Code Assessment

All Rights Reserved © Alcatel-Lucent 2010

4. HSDPA OVSF Code Assessment

5. DL Power Assessment

6. UL load Assessment

7. IUB Assessment

4. NodeB Capacity Assessment Results

1. Overview


Vodafone UK EH4 RNC

All Rights Reserved © Alcatel-Lucent 2010 | September. 08th, 2008 – Orange France

Overview

Objective

The purpose of NodeB capacity assessment is

- to analyze the BTS resources usages at BH for all NodeBs of Vodafone UK RNC EH4 (except Micro BTS and non integrated NodeB)

- to identify the resources that require a HW addition

Inputs

- NPO counters of load and blocking for W28-29 2010

Outputs

CPULoad_CCM & CPULoad_CEM Assessment

RNC EH4

#NodeB 158


CPULoad_CCM & CPULoad_CEM Assessment

CEM R99 CE Assessment

CEM HSXPA Resource Assessment

HSDPA OVSF Code Assessment

DL Power Assessment

UL load Assessment

IUB Assessment

The capacity Assessment will allow VdF UK to unders tand the current capacity status of 3G access network

#Cells 632

Overview

NodeB Capacity assessment

CAPACITYSTATUS

REPORTGENERATION

BUSY HOURCALCULATION

Configuration

Data

Observation Period


Node B Node capacity status

Inputs:

- Counters

- Indicators

Required Configuration:

- Parameters, Features

- Equipment Configuration

- NE Model and Release

Output:

- NodeB Capacity status

Vodafone UK network parameters

Specificity of Vodafone UK network

Capacity licensing is not activated, resource are used at HW capacity

Thus PaPowerCapacityLicensing = “infinite”

2 configurations of NodeB

1-Mono carrier NodeB with R99+HSxPA

2-Bi Frequency NodeB withHSDPA R99 HSUPA R99+HSxPA

HSUPA cell 1

HSUPA cell 3 HSUPA

cell 2

Monofreq NodeB

R99+HSxPAcell 11

R99+HSxPAcell 31 R99+HSxPA

cell 21


2-Bi Frequency NodeB with

R99+HSxPA on layer 2

R99 only on layer 1

| September. 08th, 2008 – Orange France

HSDPA cell 1

HSDPA cell 3 HSDPA

cell 2

LCG0

R99 cell 11

R99 cell 31 R99

cell 21

HSUPA cell 1

HSUPA cell 3 HSUPA

cell 2

LCG1

R99+HSxPAcell 12

R99+HSxPAcell 32 R99+HSxPA

cell 22

Bifrequency NodeB

2. BH Definition


BH Definition

• Two BH have been identified:

• BH_All = RB013_DLCsVoice + RB013_DLPS

• BH_HSXPA= RB013_HSDPA+ RB013_HSUPA

• BH_All is used to evaluate CPU Load CCM & CEM, CEM R99 capacity, DL Power, Ul

Load

• BH_HSXPA is used to evaluate CEM HSXPA capacity, OVSF HSDPA codes, DL HSDPA


• BH_HSXPA is used to evaluate CEM HSXPA capacity, OVSF HSDPA codes, DL HSDPA

Power (for mono Freq NodeB)

• IUB capacity is evaluated based on the max value of Received cells and Sent Cells of

the weeks observed

3. NodeB Capacity Assessment Methodology


3.1 Hardware: CPU load (Counters & Decision Tree)

Monitoring : Node B Control Plane

Control Plane is dimensioned by signaling procedures (RL Addition, RB Setup, etc…)

Control Plane is less critical than User Plane for CEM/CCM board load

CEM/CCM load is monitored at nodeB level

VS.CpuLoad.CEM (#10403)

VS.CpuLoad.CCM (#10403)

screening:

VS.CpuLoad.CEM.Max > 90 %

(Resp. VS.CpuLoad.CCM.Max > 90 %)

noStop


max/avgyes

yes

no

Add CEM board (resp CCM)

VS.CpuLoad.CEM.Avg > 70 %

(Resp. VS.CpuLoad.CCM.Avg > 70 %)Stop

3.2 Hardware: CEM R99 capacity (Counters)

Monitoring : Node B User Plane

User Plane is using only CEM resources (CCM not involved)

It is monitored at nodeB level

VS.CEMUsedDch (#10301)

screening:

max

VS.R99CECapacity (#10317)

screening:

CumHWcapacity/CumLicensing


CumHWcapacity/CumLicensing

VS.CEMAlloc (#10309)

screening:

FailSetup/FailReconf/FailSetupLock/FailReconfLock

3.2 Hardware: CEM R99 capacity (decision tree R99)

CEMUsedDch.Max > x %X = 70% for iCEM only

X = 90% for xCEM + mix

yes

no

no

Stop

CEMUsedDCh.Avg > x%

50%Stop


NodeB to be handled first are the ones that present already R99 CEM Resource blocking:

CEMAlloc> 0

yes

Increase #R99CE, add CEM card

3.3 Hardware: CEM HSXPA capacity (counters)

Monitoring : Node B User Plane

It is monitored at nodeB level

VS.HsdpaUsersCapacity (#10835)

VS.EdchUsersCapacity (#10909)

VS.HsdpaThroughputCapacity (#10836)

VS.EdchThroughputCapacity (#10910)

screening:

Scr#1:CumHWcapacity/Scr#2:CumLicensing/Scr#4:AllocSuccess/Scr#5:AllocLicensingRefusal/


Scr#1:CumHWcapacity/Scr#2:CumLicensing/Scr#4:AllocSuccess/Scr#5:AllocLicensingRefusal/

Scr#6:AllocHWfail

HsdpaUsersCapacity

edchUsersCapacity

(Scr#5 +Scr#6)/(Scr#5 +Scr#6 +Scr#4) > 0%

3.3 Hardware: CEM HSXPA capacity (decision tree HSxPA Users)

no

yes

stop


HsdpaUsersCapacity

edchUsersCapacity

Scr#2 ≥ Scr#1

noyes

- Add CEM HW resources - Add Token H Or add Token E

In VdF UK, capacity licensing is not activated Scr 5A llocLicensingrefusal =0 as it only pegs when licen se<HW capacity

The same way Scr2 CumLicensing=Scr1 CumHWCapacity

VdF UK case

HsdpaThroughputCapacity

edchThroughputCapacity

Scr#5 +Scr#6/(Scr#5 +Scr#6 +Scr#4) > 10%

3.3 Hardware: CEM HSXPA capacity (decision tree HSxPA Throughput)

no

yes

HsdpaThroughputCapacity


noyes

Stop

VdF UK case



Scr#2 ≥Scr#1

- Add CEM HW resource - Add Token E (or add token H)

(Scr#5 + Scr#6)/(Scr#4+Scr#5+Scr#6) formula allows to measure the ratio of congested TTIs from

the total active TTIs handled by the board.

Threshold value (10%) can be changed by VdF UK

3.4 DL radio: OVSF HSDPA Codes (Counters)

Monitoring : The methodology is based on the following indicator at cell level and at BH_HSXPA:

DCTM001 : number of codes used of the total available HSDPDSCH codes (Case3)

VS.HsdpaHSPDSCHCodesPerTTI.Avg/VS.NumHsPdschCodes.Avg

HSDPA076_CR (extended metric): Code load computed when Fair Sharing is enabled (Case1)

HSDPA Code Management Parameters:

Depends on the activation of Dynamic Code tree Management (DCTM) and Fair Sharing (FS) which are mutually exclusive


mutually exclusive

Case1: DCTM ON, FS OFF (all NodeB except RBS1711)

•RNC/ RadioAccessService/ DedicatedConf/ HsdpaCellCl ass/ HsPdschDynamicManagement/ maxNumberofHsPdschCodes: range[1,15] :15 in VdF UK

•RNC/ RadioAccessService/ isHsPdschDynamicManagement Allowed=True

•BTSEquipment / hsdpaCodeTreeManagementActivation= Fa lse

Case2: DCTM OFF, FS ON (RBS1711)

•RNC/ RadioAccessService/ isHsPdschDynamicManagement Allowed=False

•BTSEquipment / hsdpaCodeTreeManagementActivation= Tr ue

3.4. OVSF HSDPA Codes (Decision Tree)

no

DCTM001 > 80%

YesTuning of DCTM parameters

increase maxNumberOfHsPdschCodes

Case1: DCTM ON, FS OFF

maxNumberofHsPdschCodes < 15Yes

Add additional carrier


NodeB to be handled first are the ones that present already OVSF Code blocking:

RB Establishment Unsuccess.UnavailableDlCodeResourc es > 0

HSDPA076_CR > 80% Add additional carrier Yes

Case2: DCTM OFF, FS ON

3.5 DL radio: DL Power (counters)

Monitoring : Power per cell

UPower001_B_Avg (baseline indicator): percentage of averaged used power comparing to Max

power

VS.PaPowerCapacity

Screening: CumHWcapacity/CumLicensing

VS.RadioBearerEstablishment


VS.RadioBearerEstablishment

screening: UnavailableDlPowerResource

VS.RRC.FailConnEstab

Screening: DLPowRsrc

These methodology is also based on the following parameters:

� BTSEquipment / Capacity / PaPowerCapacityLicensing� BTSEquipment / PAResource / maxPowerAmplification

3.5 DL radio: DL Power (decision tree)

UPower001_B_Avg > 60%No

Yes

PaPowerCapacityLicensing = “infinite”

No

Yes

PaResource.maxAmplificationPower = 0 / “Full Mode”

YesNo

Stop

VdF UK case


- Upgrade PA to higher power or,

- Add Second Carrier

NodeB to be handled first are the ones that present already DL power blocking: RadioBearerEstablishment.unavailableDlPowerResource + RRCFailConnEstab.DLPowRsrc >0

Increase “PaPowerCapacityLicensing” parameter

Yes

PaResource.maxAmplificationPower = 0 / “Full Mode”

Yes

No

Increase “maxPowerAmplification”parameter

- Increase “PaPowerCapacityLicensing” parameter and,

- Increase “maxPowerAmplification” parameter

VdF UK case

3.6 UL radio: UL Load (counters and Decision Tree)

Monitoring : Uplink Load per cell

VS.CellULLoad (#10211)

screening:

TotalLoad (avg)

VS.RAB_FailEstab_CS (#2629)

screening:

ULLoad Scr#00.1% * VS.CellUlLoad.TotalLoad. TotalLoad_avg #0

> 80%

No

Stop


VS.RAB_FailEstab_PS (#2631)

screening:

ULLoad Scr#0Check TotalRoTMAX

Add freq or radio optim

> 80%

Yes

NodeB to be handled in priority1 are the ones that p resent already UL load blocking:

RAB_FailEstab_CS_ULLoad + RAB_FailEstab_PS_ULLoad> 0

3.7 Transport: Iub load (Counters and Decision Tree)

Monitoring : Node B transport

Monitoring at node B level: E1s

VS.imaGroupNbSentCell (#10615)

VS.imaGroupNbReceivedCell (#10614)

VS.PCMATMnbReceivedCell (#10015)

VS.PCMATMnbSentCell (#10016)

screening:

Avg


yes

no

Add extra E1s

Hybrid Iub

(imaGroupNbSentCell.avg + PCMATMnbSentCell.avg)/E1s > 70 %

Or

(imaGroupNbReceivedCell.avg + PCMATMnbReceivedCell.avg)/E1s > 70%

Stop

4. Node B Capacity Assessment Results


4.1 CPU board

The CPUs of CCM and CEM is a monitoring indicator for the load of NBAP signalling

For all NodeB of EH4, the CPUs of CCM and CEM are not limiting the node B

capacity

( Max < 90% and avg < 70 % )


4.2 CEM R99 capacity

NodeB Name NodeB Type CEMUse CEM Total CEM Action

Some NodeB are limited on CEM R99 CE:

5 NodeB have CEMusedDCH.Max>80% and CEMusedDCH.Avg>60% and require

URGENT CEM addition since they negatively impact CSSR

Among those 5 NodeB 46936-01 is TOP PRIORITY


NodeB Name NodeB Type CEMUsedDCH_Max@BH

CEM Used dcH avg

Total CEM Alloc failure

Action

RBS06573-01 1iCEM64+1iCEM128 95% 69% 119 Add CEM Board P1





4.2 CEM R99 capacity

NodeB Name NodeB Type CEMUsedDCH_Max@BH

CEM Used dcH avg

Total RL Setup/Reconf fails due to CEM

Action

RBS01198-01 1iCEM64+1iCEM128 87% Add CEM board

Some NodeB are limited on CEM R99 CE:

8 NodeB with iCEM only require CEM addition as CEMusedDCH.Max>70% and

CEMusedDCH.Avg>50%


RBS01198-01 1iCEM64+1iCEM128 87% 55% 33 Add CEM board

RBS01200-01 1iCEM64+2iCEM128 77% 57% 102 Add CEM Board


RBS06069-01 2 iCEM128 74% 51% 86 Add CEM Board

RBS10187-01 2 iCEM128 79% 55% 108 Add CEM Board


RBS46934-01 2iCEM128 84% 57% 161 Add CEM Board


iCEM capacity with HSxPA activated

Capacity in case of full iCEM configuration

1 iCEM128 (2 BBU) is required to provide HSxPA (1 H-BBU and 1 E-BBU)

For R99 capacity the capacity left is brought by the other iCEM cards

1iCEM64=64CE

1iCEM128=128CE Card2:

iCEM128

(BBU#1)(BBU#1)

HSDPA cell 1

HSDPA cell 3 HSDPA

Card1:

iCEM128

(BBU#1)(BBU#1)

Card2:

iCEM128

(BBU#1)(BBU#1)

HSDPA cell 1

HSDPA cell 3 HSDPA

Card1:

iCEM128

(BBU#1)(BBU#1)

All Rights Reserved © Alcatel-Lucent 2010 | September. 08th, 2008 – Orange France

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D-BBU

(BBU#2)(BBU#2)

E-BBU


D-BBU

(BBU#1)(BBU#1)

H-BBU

cell 3 HSDPA cell 2

LCG2

HSUPA cell 1

HSUPA cell 3 HSUPA

cell 2

LCG3


D-BBU

(BBU#2)(BBU#2)

H-BBU


D-BBU

(BBU#1)(BBU#1)

D-BBU

H-BBU = Up to 3 cells – 1 Frequency(belong to the same LCG)

1 E-BBU max per Node-B

E-BBU = Up to 3 cells – 1 Frequency


D-BBU

(BBU#2)(BBU#2)

E-BBU


D-BBU

(BBU#1)(BBU#1)

H-BBU

cell 3 HSDPA cell 2

HSUPA cell 1

HSUPA cell 3 HSUPA

cell 2

LCG3


(BBU#2)(BBU#2)

D-BBU

BBU


D-BBU

(BBU#1)(BBU#1)

D-BBU

H-BBU = Up to 3 cells – 1 Frequency(belong to the same LCG)

1 E-BBU max per Node-B

E-BBU = Up to 3 cells – 1 Frequency

We consider that CEM HSXPA Users capacity is limiting the node B capacity when

HSD User Reject (%) >0% or HSU User Reject (%) >0% at BH_HSXPA

3 NodeB are limited on CEM EDCH user capacity :

They are all using iCEM and thus limited to 15 EDCH users per iCEM. Swapping to xCEM allow to

support 128 EDCH users per xCEM

No NodeB are limited by the CEM HSxPA capacity. The most loaded NodeB is RBS1711-01 with

80 HSDPA users (vs 128 limit per xCEM)

4.3 CEM HSXPA capacity (HSXPA users)


NodeB Name BH_EDCH User Reject (%) BH_EDCH Max Users Action

RBS00788-01 17% 15 Swap iCEM by xCEM

RBS31094-01 0.2% 15 Swap iCEM by xCEM

RBS32520-01 5% 15 Swap iCEM by xCEM

We consider that CEM HSXPA Throughput capacity is limiting the node B capacity when

HSD Throughput Limitation (%) > 10% or HSU Throughput Limitation (%) > 10%

16 NodeB are limited on CEM HSDPA Throughput capacity during one hour at least

all but one are iCEM only (limited to 10.8 Mbps HSDPA where xCEM limited to 28.8 Mbps

HSDPA) : to increase HSDPA capacity the swap of iCEM by xCEM is proposed

No NodeB are limited on EDCH Throughput Capacity (2.1 Mbps for iCEM, 7.7 Mbps for

xCEM) since average EDCH throughput low and EDCH service allocated only on 42

4.3 CEM capacity (HSXPA throughput)


xCEM) since average EDCH throughput low and EDCH service allocated only on 42

NodeB

HSDPA Throughput limited NodeB

4.3 CEM capacity (HSXPA throughput)

NodeB Name HSDPA ThroughputLimitation(%)

HSDPA Throughput at Max blocking

Current CEM card

RBS00788-01 11% 3.1 Mbps at 3pm iCEM

RBS01709-01 11% 4 Mbps at 4am iCEM+xCEM

RBS03591-01 17% 4 Mbps at 1pm iCEM


RBS05510-01 30% 4.8 Mbps at 4am iCEM

RBS06512-01 16% 4 Mbps at 9 pm iCEM


RBS06512-01 16% 4 Mbps at 9 pm iCEM





RBS32653-01 24% 3 Mbps at 9m iCEM






For RBS1709-01, from the counters it looks like HSxPA is allocated to iCEM where it should be on xCEM to benefit from max capacity

4.4 DL radio capacity : code OVSF for HSDPA

Fair Sharing feature is not activated except on site RBS1711

The OVSF code usage for HSDPA does not limit the NodeB capacity. No sector have a

codeload > 80%


4.5 DL radio capacity : DL Power

The DL Power usage is normally limiting the node B cell capacity when Power001_B_Avg > 60%(cell) at BH

CellName

Power001_Avg

RB Blocked

HSDPA activated

#PA 45W

#PA 60W

#Freq

Action

W01711011 66% 2006 6/6 6 0 2 Swap MCPA45W by MCPA60WW01711012 70% 3408 6/6 6 0 2 Swap MCPA45W by MCPA60W


W01711022 68% 20614 6/6 6 0 2 Swap MCPA45W by MCPA60WW04657011 60% 145 yes 3 0 1 Swap MCPA45W by MCPA60WW04657021 70% 120 yes 3 0 1 Swap MCPA45W by MCPA60WW05987021 68% 115 yes 3 0 1 Swap MCPA45W by MCPA60WW05989012

60% 51 no 0 6 2Change PAAmplification from max30W to max45W

W0792103282% 420 no 0 6 2

Change PAAmplification from max30W to max45W

W11591032 76% 289 no 6 0 2 Swap MCPA45W by MCPA60WW23158022

81% 506 no 0 4 2Change PAAmplification from max30W to max45W

4.6 UL radio capacity : UL Load

CellName86%

CellULload_Total_Avg

#Freqon NodeB

Action

W46951031 96%1 All day at 96% : investigate

Some cells show High UL load>80% during Busy Hour (10-5pm), investigate if CSSR impacted

One cell has an avg UL load =96% all day � need to investigate if cabling issues or interference


1W45734012 86%

2 High UL load during Busy Hour, invetstigate CSSR

W45734021 87%2 High UL load during Busy Hour, invetstigate CSSR



W23159032 86% 2 Review load sharing with cell 31

• Parameter used by VdF

• TotalRoTMAax = 6 dB for F1 layer (HSxPA+R99), 8 dB for F2 layer (R99 only)

• maxULInterferenceLevel = - 60 dBm

4.7 IUB capacity

2 NodeBs of EH4 RNC are reaching the limit of IuB capacity => need to add additional E1

Other sites >60 but < 70 should be monitored Name

IUB Received_avg/#E1

Sent_avg/#E1


NdeBName

IUB Received_avg/#E1

IUB Sent_avg

#PCM

Action

RBS01202-01 72% 14% 4 Add E1

RBS72825-01 72% 24% 2 Add E1

RBS03591-01 62% 11% 5 Monitor

RBS05505-01 60% 6% 3 Monitor

RBS31175-01 60% 19% 5 Monitor

RBS34707-01 63% 24% 4 Monitor

Note that the introduction of IP transport in Iub provides additional transport capacity hence PCM addition is less required

Summary of recommendations (1/2)

Swap iCEM by xCEMOVSF CODE

BTS DL RF Power

Iub Interface

UL Load (RTWP)

NodeB/Cellule R99 HSxPA Add E1RBS01202-01 XRBS72825-01 X XRBS1711-01 XRBS4657-01 XRBS5987-01 XRBS07921-01 XRBS11591-01 XRBS23815-01 XRBS06573-01 X*RBS31554-01 X*RBS46936-01 X*


RBS46936-01 X*RBS01707-01 X*RBS11867-01 X*RBS01198-01 XRBS01200-01 XRBS03449-01 XRBS06069-01 XRBS10187-01 XRBS35847-01 XRBS46934-01 XRBS72998-01 XRBS23159-01 XRBS46951-01 XRBS45734-01 X

* In bold high priority

Summary of recommendations (2/2)

Swap iCEM by xCEMOVSF CODE

BTS DL RF Power

Iub Interface

UL Load (RTWP)

NodeB/Cellule R99 HSxPA Add E1RBS00788-01 X (H&E)

RBS01709-01 X

RBS03591-01 X

RBS05507-01 X

RBS05510-01 X

RBS06512-01 X

RBS10187-01 X

RBS11592-01 XRBS11867-01 X


RBS11867-01 XRBS32296-01 XRBS32653-01 XRBS33279-01 XRBS35245-01 XRBS46925-01 XRBS46934-01 XRBS31094-01 X (E)RBS31520-01 X (E)

Limitations are for HSDPA unless stated E

Thank you


VfUK_NodeBCapacity

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