Radio Network Optimization

(1)

OSS-RC 5

(2)

Agenda

OSS-RC RNO Overview

RNO for WCDMA

MRR-W

NCS-W

NCS-GW

RNO for GSM

MRR-G

NCS-G/NOX

FAS/FOX

SYROX

CCE

TET

(3)

Agenda

OSS-RC RNO Overview

RNO for WCDMA

MRR-W

NCS-W

NCS-GW

RNO for GSM

MRR-G

NCS-G/NOX

FAS/FOX

SYROX

CCE

TET

(4)

Network Functionality -

Summary

Functionality factor

1992

1998

2004

2010

Cost of Operation

Time

Network

Functionality

O&M Cost

(5)

Planning Tuning Troubleshooting

TET

MRR (GSM & WCDMA)

FAS, FOX

NCS (GSM & WCDMA), NOX

SYROX

RNDBI

RNO

R-PMO, REDE

RPDBI

EBS (GSM, WCDMA, Core)

EBA

Event

Based

Applications

Business Objects

ENIQ

OSS RC Radio NW Monitoring & Optimization tools

TEMS Visualization

RTTM

FFAX

(6)

RNO Advantages

!

Centralized operation from the RNO GUI

–

Recording, file collection & presentation

–

Seamless Operation for 2G/3G operators

!

Measurements from a live network and real mobiles

!

Overview of a large number of cells

!

Timesaving compared to drive tests

(7)

Time savings in Radio Network

Optimization

!

Frequency optimization: Suggest

frequency changes

for minimized interference

Time saving ~ 95%

!

Neighbor identification: to find

potential neighbours to add and

identify neighbours that can be

removed

(8)

Example 1 - Quality Improvements

!

0.5% increased call set up success rate and 0.6% reduced call drop

rate in a city with 3000K subscribers leads to:

!

1 440 000 USD yearly increased revenue

Network improvements give value

Example 2 – Optimization Neighbor relations

!

Drive testing in 2000 cells with measurements,

30 minutes per cell -> 1000 man hours

!

Comparable to a few hours of recording with NCS/NOX

complemented with STS statistics 0.5 man hours

Example 3 – Identification of interference in whole network

!

Whole network can be checked for abnormal interference in 2 hours!

Example 4 – Optimization of interference and quality

!

Using Frequency Allocation Support FAS in a tuned quality network enabled

fast identification of interference sources and fine tuning activities resulting in

(9)

Estimated downlink interference

= ~ 50 %

Measured uplink interference

= ~ 7 %

Downlink Quality Triggered Handover

= ~ 35 %

Uplink Quality Triggered Handover

= ~ 12 %

Handover Fail

= ~ 9 %

Handover Drop

= ~ 7 %

Low Quality drops – SDCCH

= ~ 8 %

Example 4 –

Optimization of Interference and quality

(

Result from real optimization project during 2005)

The numbers indicate the improvement to a tuned network using RNO FAS

measurements, ICDM and external cellplanning tools !!

(10)

When can RNO be helpful?

!

Frequency Planning

!

Missing or too many neighbor relations

!

Catastrophy situations, fast re-optimization

!

Bad TCH or BCCH frequencies

!

No dominant server

!

External interference

!

Cell covers too much, wrong position, antenna direction

!

Swapped sectors

!

ACCMIN, MSRXMIN

!

Power control or HCS parameters

!

Bad speech quality

!

Competitor analysis, roaming performance strongest server

!

2G/3G NCS-GW, find the best WCDMA neighbors

!

3G NCS-W, handle and optimize WCDMA neighbors

!

3G RES/MRR-W find cells with bad service quality

(11)

RNO functionality summary

! MRR-GSM - analyze radio characteristics, “Seamless Operation”

! NCS/NOX GSM - find the best GSM neighbors

! FAS/FOX GSM - find the best frequencies

–

measurement of internal/ external interference

–

Create ICDM measurement

! SYROX - optimization of synchronized radio networks

! CCE – Evaluating the competitor coverage compared to own

! TET - find the best hot spot location

! NCS-GW - find the best WCDMA neighbors in GSM

! NCS-W – find the best WCDMA neighbors and maintain neighbor list

! MRR-W Analysing coverage and quality, Seamless Operation

(12)

Installed base

Nov. 2006 compared to Nov. 2007

2007

2006

OSS Systems

MR

R

F

A

S

F

O

X

N

C

S

N

O

X

T

E

T

S

Y

R

O

X

N

C

S

-G

W

N

C

S

-W

MR

R

-W

0

10

20

30

40

50

60

70

80 Installed base RNO

nov-06

nov-07

(13)

NCS-GW

MRR-G

NCS-G

Radio Network Optimization

GSM

and WCDMA

FOX

FAS

SYROX

RNDBI

BRF

NCS-W

MRR-W

RNDBI

CCE

NOX-G

TET

RNDBI

(14)

RNO WCDMA - Common structure

RNC

RNO Applications

CS

Reports

_Export

Network

data

Recording

parameters

Recording definition

Measurement data

PMS

RBS

MRR-W NCS-W EBS-W

TSS

Authen-tication

(15)

Reports

Export

BSC

RNO Applications

CNA

SDM

Recording

Definition

Recording

Data

Counters

Network

update

Implemen-Data

Collection

Network

data

CNAM

BSM

GNIP

TSS

Network

data

Maps

Authentication

Supervision

RNO GSM - Common Structure

RBS

...

(16)

BSC recording functions

Measurement

Report

RIR

Uplink interference

BSC recording function

MRR

BAR

MRR

TET

FOX

FAS

NOX

NCS

Measurement Result

Serving

cell DL

Serving

cell UL

BSC

SYROX

Neighboring

cell DL

(17)

Agenda

RNO for GSM

MRR-G

NCS-G/NOX

FAS/FOX

SYROX

CCE

TET

(18)

When can MRR-G be helpful ?

!

Speech Quality

!

Traffic distribution

!

Power control

!

HCS parameters

!

Bad speech quality

!

Cell cover too much (non-urban area)

!

Signal levels

!

...

What value does

MRR-G bring to you?

(19)

Supervision

Network

Performance

Implementation

CNA

Verification

Compare

Radio

Characteristics

before and after

change of

parameters

Analysis

Signal Quality

Signal Strength

MS Power level

BTS Power Red.

Timing Advance

Path Loss Diff.

Path loss

(20)

(21)

MRR Overview Histogram

Signal strength

Path loss

Signal quality

MS power Level

BTS power reduction

Timing Advance

(22)

!

Recording thresholds can be specified when a new recording is

defined

!

The following thresholds are available:

–

RxQual

–

RxLev

–

TA

–

Path Loss Difference

–

FER

–

RxQual and RxLev

–

RxLev and TA

–

FER and RxLev

–

FER and TA

MRR Recording Parameters

Thresholds

!

Available filters:

–

Full Rate

–

Enhanced Full Rate

–

Full Rate and Enhanced Full Rate

–

Half Rate

–

AMR Full Rate

–

AMR Half Rate

(23)

When can NCS/NOX be helpful ?

!

Missing neighbor relations

!

Too many neighbor relations

!

Find neighbour relations to new cells

!

Cell in wrong position or incorrect antenna direction

!

No dominant server

!

Cell covers too much/little

!

Allows fast re-configuration during catastrophy situations

–

also FAS/FOX

(24)

NCS/NOX recording data

• BAR is used to find

potential neighbors to

add

• Handover statistics is

used to find neighbors

that can be removed

(25)

BCCH

33 BSIC 17

BAR - Active BA-list Recording

Serving Cell

BCCH 35

BSIC 12

BCCH 37

Undefined

Neighbour Cell

Defined

Transmit Active BA-list

(35, 37,

33 )

Mobile listen for

BCCH 35, 37,

33 BSC

BSC

(26)

(27)

NCS Recording data

Recording thresholds

Test

frequencies

Cells to

include

Inter system

neighbour relations

(28)

NOX functionality

! Gives recommendations on neighbors to add and

remove

! Possibility to accept or reject some or all of the

recommendations

! Automatic update of the network

– NOX uses a CNA planned area

– NOX schedules an update job

(29)

When can FAS/FOX be helpful?

!

Bad BCCH/TCH frequency

!

External interference

!

Cell covers too much

!

Cell in wrong position

!

Wrong antenna direction

!

No dominant server (FAS/FOX, NSC-G )

!

FAS ICDM measurements as input to frequency planning

(30)

FAS Uplink Interference

!

All TRXs in the cell measures the uplink interference

repeatedly on test and configured frequencies

!

Use RIR function in the BSC

How to see uplink

Interference?

(31)

FAS Downlink Interference

!

Measurement Reports from MS on test and configured

frequencies are collected

!

An ICDM is created and PIT-values are calculated to give an

estimation of the downlink interference

(32)

(33)

FOX - Frequency Optimization eXpert

Recording

Reallocation

Algorithm

Reallocation

Algorithm

Implemen-tation

Change Order

Recommendation

Mode

FAS-recording

Automatic

Mode

(34)

SYROX Introduction

Synchronized Radio Network Optimization Expert

! Provides an easy way to find and maintain parameter settings

related to synthesized frequency hopping in a synchronized

radio network

“Without SYROX this is a very complex task”

! Based on subscriber generated data

! Integrated into RNO and dependant on FAS ICDM

! Trials from real networks show a significant quality

(35)

SYROX activities

ICDM

Sync

Prioritized

Cells

SYROX

algorithm

SYROX

algorithm

FAS

CNA or

CNAI

SYROX recommendation:

MAIO

HSN

FNOFFSET

TSC

(36)

(37)

When can CCE be helpful ?

!

Benchmarking activities to competitors

–

Evaluate the coverage of radio access networks belonging to

competitor operators

–

Identify what is the average difference towards a competitor

–

Compare strengths and weaknesses between own and

competitor radio access networks

!

Input to a churn rate improvement activity

!

Verify improvements to network after tuning activity

!

Help when planning expansion of the coverage

OSS-RC 5.2

FAJ 121 1172, CCE

(38)

Using CCE data

Example for management level reports

Lose

Same

3

1

2 Arlanda Airport

Same

Lose

Win

Same

Trend

year

Lose

3

1

2 Norrland

Win

3

2

1 E4 (road)

Trend

month

Competitor

Y rank

Competitor

X rank

Own

Ranking

Cellset/Area

Lose

1

2

3 Lkpg+Nkpg (Cities)

Win

2

3

1 Skåne (region)

Same

3

1

2 Göteborg City

Same

3

1

2 Stockholm City

(39)

Competitor coverage evaluation

!

Uses own terminals to measure on competitors.

!

Uses the Competitor Coverage Recording, CCR, in the BSC

(07B)

!

The result is shown both as detailed reports as well as

higher level management reports that give answers on the

following:

–

What is the average difference towards a competitor?

–

Has the situation changed since last report period?

–

Has a network enhancements activity given wanted result?

(40)

Measurement

Report

RIR

Uplink interference

BSC recording function

MRR

Measurement Result

Serving

cell DL

Neighbour

cells DL

Serving

cell UL

3G RBS

GSM BTS

BSC

TET

FOX

FAS

NOX

NCS

GWNCS

SYROX

MRR

CCE

BAR

GWBAR

CCR RECORDING

(41)

(42)

(43)

(44)

(45)

(46)

Operator Benefits

!

Simple and reliable:

–

Very simple handling – anyone can do it

–

Real customers, real traffic

–

Fast: hours instead of weeks/months of drive testing

!

Knowledge of competitive strengths and weaknesses in the

radio access network

!

Ability to focus resources (CAPEX or staff) where they make

the most impact

(47)

TET Usage

!

Estimate:

– How much traffic a new cell would take

– Quantify off-load in the surrounding cells

The tool is intended to facilitate capacity expansion, where good

coverage already exists, e.g. introducing hot spot micro cells.

(48)

TET - Traffic estimation tool

• A test transmitter is used

that transmits a

BCCH-frequency

• The mobiles in the

surrounding cells measure

the signal strength of the test

transmitter

• The test transmitter doesn’t

take any traffic

TEST Transmitter

MR:s

(49)

TET Traffic level chart of Surrounding

cells

(50)

Agenda

OSS-RC RNO Overview

RNO for WCDMA

MRR-W

NCS-W

NCS-GW

(51)

Why MRR-W?

!

”If I have an RNC with maybe 800 or more cells and a mix of

urban, suburban, outdoor and indoor areas, then I would like

to find:

–

The cells with the worst coverage problems in UL or DL

–

The cells with the worst voice quality in UL or DL.”

!

”If I have a number of cells with high call drop rates then I

would like to investigate the radio environment

–

Can it be bad coverage in UL or DL?

–

Can I find any DL interference?”

(52)

Advantages of MRR-W

!

MRR-W is used for supervision and evaluation of the network

performance for a large number of cells

!

Unique measurements not available anywhere else

!

Measured per service or Spreading Factor

!

Find the cells with bad speech quality

!

Analyse and optimize the Signal levels (Ec/No and RSCP) for

HSDPA (Service=InteractiveHS)

!

Analyse the uplink and downlink quality for the Video users

(53)

MRR-W dependency:

Radio Environment Statistics - RES

!

RES is a measurement function implemented in the RNC

–

Collects measurements from RNC, RBS and UE

(54)

MRR-W Recording

MRR-W Report

Error Log

(55)

(56)

(57)

MRR-W Histogram Report

Downlink CPICH Ec/No in dB for Speech

Downlink CPICH RSCP for Speech

90 th

_Percentile

= -12 dB

(58)

Downlink Speech BLER (%)

Uplink Speech BLER (%)

UE Transmit Power for Speech (dBm)

Downlink CPICH Ec/No for Speech (dB)

Downlink CPICH RSCP for Speech (dBm)

Downlink Transmit Code Power for Spreading

Factor 128

(59)

Why NCS-W?

!

”Correct Neighbor cell definitions are vital for good WCDMA

performance, even more so than for 2G systems.”

!

”Neighbor cell optimization usually requires a lot of manual

O&M work and drivetesting”

!

”The network expansion is so fast that it is difficult to keep

up”

NCS-W can be used to:

(60)

WCDMA Neighboring Cell Support

!

NCS-W can be used to:

–

Detect missing neighbor cell definitions

–

Supervise existing neighbor definitions

–

Evaluate new cell relations after cells are added to the network

Existing neighbors

Missing neighbor

New cell

(61)

WCDMA Neighboring Cell Support

STATS

GPEH

Events

RNC

OS

S

NCS-W Reports

NCS-W Change order

(Planned Area)

Add: Relation A-B

Add: Relation B-A

Remove: Relation A-C

....

(62)

GPEH Events

!

Based on GPEH messages:

–

INTERNAL_SOHO_DS_MISSING_NEIGHBOUR

! Occur when RNC receives event 1a or 1c measurement

report and the triggering cell is not included in the Neighbor

Set

–

INTERNAL_SOHO_DS_UNMONITORED_NEIGHBOUR

! Occur when handover proposal is received, where the

proposed cell is included in the neighbour set, but not

included in the monitored set

(63)

Counters

!

NCS-W collects and presents counters that measure

WCDMA neighbour relations usage

!

The cell relation counters used are:

–

pmRlAddAttemptsBestCellSpeech

–

pmRlAddSuccessBestCellSpeech

(64)

NCS-W New Recording

WCDMA<-> WCDMA (soft, softer)

GSM->WCDMA

GSM<->GSM

(65)

NCS-W Overview Report

(66)

NCS-W Cell Report

Defined Neighbors

Distance calculated

from cells coordinates in

(67)

NCS-W Cell Report

Undefined Neighbors

Guess based on reported SC and

data from CS database

(68)

Why NCS-GW?

!

”Correct IRAT neighbor relations are important for reducing

dropped calls and improving speech quality”

!

”WCDMA uses GSM as fallback technology when

coverage/quality or capacity fails”

NCS-GW can be used for:

• Optimization of the GSM to WCDMA neighbor relations

• Find missing neighbor relations for WCDMA to GSM

(69)

NCS-GW Usage

!

NCS-GW can be used to:

–

Find neighboring 3G cell relations to a new GSM cell (network

planning)

–

Find missing neighboring 3G cell relations in the active 3G

BA-List in GSM cells (network optimization)

–

Find neighboring 3G cell relations to be removed from the active

3G BA-List in GSM cells (network optimization)

–

Evaluate neighboring 3G cell relations in GSM cells (network

supervision).

(70)

Integrated in NCS as an add-on

Neighbouring Cell Support GSM-WCDMA

According to FDDMRR

or change during rec. to

1, 2 or 3

UMFI (UTRAN Measurment

Frequency Information) =

(71)

NCS-GW Overview Report

Top ranked cells with potential new

WCDMA neighbor relations to add

(72)

NCS-GW Cell Report

Defined Neighbors

Data from MR:s

Data from STS

(73)

NCS-GW Change Order

(74)