2g Rno Workshop for Pths_rev2

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

Security Level:

47pt

30pt

Color::white

:

FrutigerNext LT Medium

Font to be used by customers and

:

Arial

www.huawei.com

RADIO NETWORK

OPTIMIZATION

WORKSHOP

08 May 2012


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CONTENTS

1. Network Optimization Overview

2. Worse Performing Cell Analysis and Approach

3. Radio Network Optimization Guidelines

4. Alarms Monitoring Guidelines

5. Introduction to Ericsson Radio Network Optimization Tools

6. Bogor Cluster Trial Report

7. Short Quiz on Basic GSM Overview


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NETWORK OPTIMIZATION

OVERVIEW


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OVERVIEW

WHAT IS NETWORK OPTIMIZATION? Improving the Overall Performance of the Network from a Subscriber

and Operator point of view at the least possible cost.

Maximize and Maintain the Network Quality and Performance.

Optimization using ARTS: A Analysis

R Recommendations

T Troubleshooting

S Summarize Network Improvements

Key Performance Indicator (KPI) and Customers Satisfaction are the

main factors in assessing the Network Optimization Achievement.


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OVERVIEW

In a young network the primary target is normally the Coverage.

In this phase usually there is a massive use of Drive Test Measurement.

Check the Signal Strength and Intended Coverage

Benchmarking Performance of the competitors

Young Network Case


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OVERVIEW

In a mature network, the primary targets are Key Performance Indicators (KPI)

Call Minutes Per Drop Call Set-Up Success Rate TCH/SDCCH Drop Call Rate Handover Success Rate TCH/SDCCH Blocking rate

Drive Test Measurements are still important used to verify

Benchmarking Drive Test Activity During the Initial Tuning of New Sites On-Air VIP and Customer Complaints Coverage Issues and Best Server Analysis Major Frequency Retune Feature Trials

Mature Network Case


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Accessibility ( Call Set-up Success Rate, Random Access Failure Rate, Paging Success Rate, SDCCH Congestion, SDCCH DCR, TCH Congestion )

Retainability ( TCH DCR, HOSR, CMPD) Mobility ( HOSR, ISHO) Quality ( RXQUAL, SQI )

Hierarchy of Performance Indicators A/R/Q KPIs


OVERVIEW

%Population

%Area

License

Fulfilment

% Rural Land

% Urban Indoor

% Population

% Urban Outdoor

Service Area

Coverage

Traffic 2% G.O.S

Traffic for 5% of cells

@ 2% G.O.S

Cell Capacity

Utilisation

Radio

Capacity

Capacity

%Assignment

success rate

%Im. assign.

success rate

%SDCCH

drop rate

Call set-up

success rate

% Paging success

rate

Paging

Service

Accessibility

%Drop call

rate

Erlang-minutes

per Drop

Call Completion

%Intra BSC

%inter BSC

%Inter MSC

%Total

HO success

rate

Service

Retainability

%Timeslot

%BTS

%BSC

%MSC

Service

Availability

Quality

Overall

E/MHz/sqkm

Urban

E/MHz/sqkm

Radio Spectrum

Efficiency

Cell Capacity

Utilisation

Traffic load

Distribution

BSC Utilisation

Radio

Utilisation

Link Utilisation

A-interface

Transmission

Utilisation

Network

Utilisation

Planning

O & M

Transmission

Implementation

Technical

Department

Business

Administration

Marketing/

Sales

Organisation

Efficiency

Efficiency

Basic services

Supplementary

services

Extra services

Functionality

Churn

Rate

Customer

Complaints

Customer

Satisfaction


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WORST PERFORMING CELL

ANALYSIS AND APPROACH


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Worse Cell List (WCL) is the most important step in identifying the most problematic cell in the network.

Important data needed when analyzing the Worse Cell List.

ABSOLUTE VALUE (I.E. TNDROP,CNDROP)

TRAFFIC PROFILE

RATE (I.E. DCR, SDCR)

AVAILABILITY

SITE LOCATION

WORST PERFORMING CELL

ANALYSIS


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Ranking Process for TCH Drop Call Rate

Number of Dropped TCH Connection (TNDROP)

Total TCH Traffic

Subscriber Perceived TCH Drop

WORSE PERFORMING CELL

ANALYSIS


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Identifying the Root Causes and Reasons

BAD COVERAGE CONDITION (i.e. Edge of the Network Sites, In-building issue)

BAD QUALITY (i.e. Co-channel Interference, External Interference, Overshooting Cells)

ANTENNA SYSTEM FAILURES

HARDWARE ALARMS (i.e. Faulty TRX)

TRANSMISSION FAILURES (i.e. DIP Errors, Power Outages)

NETWORK DOWNTIME ACTIVITIES

CONGESTION

WORSE PERFORMING CELL

ANALYSIS


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RADIO NETWORK

OPTIMIZATION GUIDELINES


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RNO Process and Guidelines are essentials in dealing with the Performance and Quality of the Network.

There is no strict process for optimization because the activity is driven by the Network Evolution.

The most important thing in RF Optimization is how Engineers are able to come up with the utmost and best solutions to the existing network problems.

RADIO NETWORK OPTIMIZATION

GUIDELINES


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GUIDELINES

Network is under permanent change detect problems and symptoms early!

PERFORMANCE EVALUATION


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GUIDELINES


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GUIDELINES DCR

NOTE: MONITOR ALL

CHANGES MADE INCLUDING

HW RECTIFICATION TO

VERIFY IF PERFORMANCE

IMPROVED.


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GUIDELINES DCR

BAL607A is an example of Transmission Link Failure with

High DCR Due to Sudden Drops increases.

TCH Availability was also degraded due to link failures.


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GUIDELINES DCR

MCT202A is an example of Drop Call on Low SS and

Coverage Issue.

Drop Due to Low SS averages 87% while MRR Data shows

that it reaches 14-15km.

Subscriber notice on Mount Arayat.


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GUIDELINES SDDR

NOTE: MONITOR ALL


HW RECTIFICATION TO


IMPROVED.


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ARA602B is a good example of

SDCCH DCR due to Quality.

After the BCCH retune

from 774 to 803. SDCR Improves!

DCR also Improves as the

Drop Due to Uplink Quality

was minimized


GUIDELINES SDDR


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GUIDELINES CSSR

NOTE: MONITOR ALL


HW RECTIFICATION TO


IMPROVED.


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GUIDELINES HOSR

NOTE: MONITOR ALL


HW RECTIFICATION TO


IMPROVED.


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ALARMS MONITORING

GUIDELINES


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Daily Alarms Monitoring is the PRO-Active way of knowing your network situation.

Alarms Fault Code should be take into consideration when troubleshooting alarms.

ALARMS MONITORING

GUIDELINES


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ALARMS MONITORING

GUIDELINES

NOTE:

IT IS VERY IMPORTANT THAT

ANY ALARM RELATED ISSUES

SHOULD BE VERIFIED FIRST

IF IT IS KPI DEGRADING


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Engineers should know which Alarms are

KPI Affecting.

Correlate this alarms with KPI Statistics.

??

ALARMS MONITORING

GUIDELINES


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RF PERFORMANCE ALARMS

This is a new type of Alarms to

monitor the TRX Performance of a

Cell.

BTS INT UNAFFECTED

This type of Alarms needs further

analysis by running MML

Commands to know the Fault

Codes.

ALARMS MONITORING

GUIDELINES


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IDENTIFYING FAULT CODE

FC 2A 33/57 Means RX Diversity Lost and RX Path Imbalance

ALARMS MONITORING

GUIDELINES


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N-UAS - This is the Number of Unavailable

Seconds at Local End

SES - This is the Number of Severely Error

Seconds at Local End

From a Network Performance point of view,

the link quality between BSC and BTS give a

direct impact mostly on Drop Call Rate ,

when the Link Faults are intermittent and on

Voice Quality (because of Cell Availability)

when there is a long duration of Link Faults.

ALARMS MONITORING

GUIDELINES


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INTRODUCTION TO ERICSSON

RNO TOOLS


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ERICSSON RNO TOOLS MRR

MRR is an Operation and Support System (OSS) Tool.

MRR stores and records the measurement reports on both Uplink and Downlink.

The Statistics is collected and stored for each mobile in active mode during the recording.

MRR is very useful in identifying the Cell Coverage and Overshooting Cells by using the TA measurement.

Received Signal Level Measurement both on Uplink and Downlink is useful for Handover Analysis.

MEASUREMENT RESULT RECORDING (MRR)


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STM710B TA Measurement shows that it is still getting

Traffic >3.5Km.

This is an example of Overshooting Coverage.



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BUS202C TA Measurement shows that it is still getting

Traffic on >5km up to 16km

This is an example of Overshooting Coverage




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HAG702C is an example of Coverage Issue. Because TA

measurements reports shows data at 12-14Km. Based on

the map we noticed that there are

villages/houses/subscribers in this area.




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NCS is an Operation and Support System (OSS) Tool.

NCS is a great tool for optimization because it measures and recorded not only the Defined Neighbor Cells but also the Undefined Neighbors.

NCS Version for R07 now includes Handover Statistics.

Distance between Serving and Target Cells are included in the recording results only if Coordinates were updated on the OSS.

Take Note that during the NCS Recording, OSS Engineer can not implement new neighbor relation.

NEIGHBOR CELL SUPPORT (NCS)

ERICSSON RNO TOOLS NCS


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The Relative SS is

recorded if the signal

strength for a

neighboring cell is

higher than or equal to

the signal strength for

the serving cell plus

the value given in this

field.

Relative SS: -3dB

The Absolute SS

occurrence is

recorded if the signal

strength for a

neighboring cell is

higher than or equal to

the value given in this

field.

Absolute SS: -85 dBm


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HO Statistics



NCS Reports will give a better view on the cells that

were NOT Defined as Neighbors.

Check List : # of Reports >10,000 , Average SS

and Distance

The total number of measurement reports which

include this frequency number (representing the

BCCH/BSIC) in the active BA-List . When

considering to add a neighbour, make sure that the

decision is based on enough traffic (about 10.000

reports are sufficient).


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Missing Neighbor Relation to STM608A is spotted

at BOC604A (BCCH=808 BSIC=50).

BOC604A is an Overshooting Cells. Down Tilting

Activity Needed.


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Frequency Allocation Support (FAS) records the Uplink Measurement which is the RIR.

RIR measures the Uplink Interference Level.

RIR measurements can be manually recorded on the BSC. Just in case OSS is not available.

Take Note that FAS and NCS Recording can not be scheduled simultaneously.

FAS AND RADIO INTERFERENCE RECORDING (RIR)

ERICSSON RNO TOOLS FAS


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FAS AND RADIO INTERFERENCE RECORDING (RIR)

ERICSSON RNO TOOLS FAS

Based on RIR Results, The Uplink

Channel is Interfered by as high

as -87 dBm on Channel 664.


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Command Handling Applications (CHA) is an OSS Tool.

This a powerful tool used by OSS and RNO Engineers.

Check Site Status

Troubleshoot and Rectify Alarms

Implement Parameter Changes. CNA is preferred

On most cases, RNO Team only has Read-Only version on their remote terminals.

COMMAND HANDLING APPLICATIONS (CHA)

ERICSSON RNO TOOLS CHA


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Using the MML command, CHA will be able to Identify

the Site Status (Working and Down)

Zero 0 data means site or cell is down during the time when we run the health check.


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CHA is very useful in Identifying the Alarms.

CHA will be able to know how high the ICMBAND of a

cell.


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CNA Interface is the Preferred Tool by Ericsson for Network Parameter Modifications.

CNA will reduce the risk of Data Inconsistencies.

CNA can generate Consistency Check.

CNA can implement Global Parameter Changes by using the CNA Export and Import Data (i.e. Major

Frequency Retunes)

CELLULAR NETWORK ADMINISTRATION INERFACE (CNAI)

ERICSSON RNO TOOLS CNAI


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The CNA Interface is a facility for exchanged of cellular data between an external system and CNA. The data is exchanged by means of data files,

here called Transfer Files.

CNA data is exported from the Valid Area in CNA to a transfer file stored in the OMC file system.




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Import data is read from a transfer file in the OMC file system and stored in a CNA Planned Area.

CNAI Transfer File is an ASCII-based text file.




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Below is a sample of CNA Import File Format.




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BO Tool is used worldwide by Ericsson.

BO is a tool used for Statistics Analysis and Network KPI Performance.

All Counters and Formulas are integrated in BO Tool.

Operators normally create their own formula and with the BO Tool this can done

BUSINESS OBJECTS TOOL (BO)

ERICSSON RNO TOOLS BO


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Report Manager

BUSINESS OBJECTS TOOL (BO)

ERICSSON RNO TOOLS BO

Insert and Delete Columns/Rows Add and Delete Tables Create Charts Insert/Duplicate/Delete Reports Filter, Sort and Rank Data Define Variables and Formulas Perform calculations


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MCOM Tool were develop by Ericsson and are used worldwide.

MCOM is a tool used for RF Planning and Optimization in Analyzing Network Problems.

MCOM has 3 important database.

Site Database Carrier Database Neighbor Database

MCOM uses the up to date network data for Frequency and Neighbor list. This can be done by uploading the CDD MML Printout Files.

MCOM TOOL

ERICSSON RNO TOOLS MCOM


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Used for Neighbor

Cell Analysis

MCOM TOOL



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Great for checking

co-channel

interference

MCOM TOOL



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CDD Tool were develop by internal Ericsson Engineer.

The 2 Important Outputs of CDD Tool are:

Creation of CDD Dump files

Consistency Checking / Inconsistency Reports

Note that Data Inconsistencies Output Report should be implemented ASAP to reduce the risk of network

performance degradation.

CELL DESIGN DATA (CDD) TOOL

ERICSSON RNO TOOLS CDD TOOL


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CELL DESIGN DATA (CDD) TOOL

ERICSSON RNO TOOLS CDD TOOL

This is an example of Implementing

Additional Neighbor Relation by

using only Winfiol Tool.

It is clearly shown that MF List for Ncells

BLS603B and GUI606B were not included


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BOGOR CLUSTER TRIAL

REPORT


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Bogor Cluster Trial Report

Bogor Cluster had total of 84 Sites / 204 cells / 1632 TRX in 2G.

Optimization activities were carried out for 6 weeks.

4 RAN KPIs were monitored Perceived Drop Call Rate, Perceived Congestion, SDCCH Drop Call Rate and SDCCH Success Rate.

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KPI PERFORMANCE RESULTS

KPI PERFORMANCE HIGHLIGHTS

Below are the following issues tackled and was resolved:

LAPD Paging Overload Alarm caused by IRB Board Faulty. Transmission Failures with DIP Error caused by Transmission Link Problem and Power Outages.

Drop Call and Quality Issues caused by Overshooting Cells. SDSR Issues on site 2413931_CKBKSST with Zero TCH Traffic caused by Stolen Feeder problem.

Availability issues caused by site cascading (51390 and PC454).

Bogor Cluster Trial Report KPI


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Below are the activity highlights:

1. Feb 11-13, 2012: Degradation was caused by the increasing in number of DIP Errors Issues

2. Feb 27-29, 2012: Due to Re-homing Activities from BBGR4 to BBGR2.

3. March 3, 2012: Improvement was noticed after rectification of the IRB Board. DIP Errors was

resolved around 90%. Faulty IRB Board was replaced in BBGR2.

4. Downtime increased while 6 cells fluctuated in Peak hour. These are the cells (661, 14081,

MC5134, PC455, PC454 and 51370)



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and availability.

2. Feb 19-20, 2012: Degraded due to availability/downtime issues affecting 26 cells.



resolved around 90%. Faulty IRB Board was replaced in BBGR2. Aside from this, SDCCH

Re-configuration movement to CHGR-0 was also implemented.

5. Due to Fiber cut (Telco-Incident) from 21stMar 19:34PM to 00:00AM



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and availability.


3. SDCCH blocking also increased due to Signaling Fluctuation in Peak hour.


resolved around 90%. Faulty IRB Board was replaced in BBGR2. Aside from this, SDCCH

Re-configuration movement to CHGR-0 was also implemented and new feeder Cable

installed on site 2413931.

5. Due to Fiber cut (Telco-Incident) from 21stMar 19:34PM to 00:00AM



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2. Feb 19-20, 2012: Degraded due to availability/downtime issues affecting 26 cells.

3. Feb 28, 2012: affected by the 11 cells downtime problem, also lead to increase in SDCCH

blocking.


resolved around 90%. Faulty IRB Board was replaced in BBGR2.

5. March 16-19, 2012: TCH Blocking increased due to 3 cells -> 681, 7561, and JK24583. All

these cells have low Availability around 50%.



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CONCERN

LAPD Paging Overload alarms on sites under BBGR2

FINDINGS

CLOCK Reference State in BBGR2 is on BLOCK state This Block State is suspected to be caused by the Faulty IRB Board

ACTION

The IRB Board was replaced with a new one The CLM Control Value was also adjusted

RESULT

The Clock Reference State is back to normal and the RALT Slip on BBGR2 improved

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Bogor Cluster Trial Report Root Cause Analysis (1)


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The RALT Slips were

cleared after the IRB

Board was replaced .


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CONCERN

Intermittent Transmission and DIP Errors

FINDINGS

Based on one week data, 26 sites were identified to be experiencing severe Frame Slip Errors

ACTION

Troubleshooting and rectification were made for 23 out of 26 sites. 3 Sites left due to Backup Battery Replacement

RESULT

KPI Performance for the TCH Drop Rate and SDCCH Drop Rate improved as well

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N 2/23/2012 2/24/2012 2/25/2012 2/26/2012 2/27/2012 2/28/2012 2/29/2012

1 RBLT92 BBGR4 0757L1_SANJAYA2 0 0 1206 1498 6197 2163 1206 1720

2 RBLT20 BBGR2 0013L2_CLDBGR3 0 0 1177 1489 6386 2107 1207 1656

3 RBLT191 BBGR2 0728L1_PADASBG2 2 51 1257 1548 6742 2152 1278 1627

4 RBLT221 BBGR2 1166L2_WESTBGR3 2 0 1208 1483 6646 2073 1195 1563

5 RBLT92 BBGR2 2433911L1_BKBG2 0 0 1181 1415 6452 2011 1159 1548

6 RBLT126 BBGR2 0012L2_MTGBGR3 0 0 1002 1334 6524 1971 1206 1505

7 RBLT114 BBGR2 PC456_NOVOTLBGR 985 1501 1301 1855 3777 6565 2249 322

8 RBLT45 BBGR2 A443_CIMAHPARSK 879 706 253 478 312 926 261 295

9 RBLT39 BBGR2 A445_KATULAMPA 30 28 554 691 52 475 110 142

10 RBLT207 BBGR2 A445L1_KATULMPA 32 30 549 659 29 454 102 132

11 RBLT111 BBGR4 0749L1_BKSRTNL2 162 0 44 162 153 397 48 114

12 RBLT68 BBGR4 0752L1_SKAHATI2 159 0 26 159 147 378 38 110

13 RBLT187 BBGR4 0758L1_NGGWER2 171 0 34 115 149 371 43 110

14 RBLT155 BBGR4 0778L2_SRSENTL3 151 0 18 168 144 384 55 108

15 RBLT114 BBGR4 2412254L1_PDEN2 0 5 39 169 158 378 62 107

16 RBLT95 BBGR4 2412254_PMRADEN 0 2 32 126 165 367 43 104

17 RBLT157 BBGR4 2412468_KMKOLOT 167 1 34 143 139 385 48 103

18 RBLT247 BBGR2 0066L1_KEMNGRY2 65 96 813 402 381 474 1172 102

19 RBLT69 BBGR4 2412257_CBINONG 163 0 22 156 145 383 41 102

20 RBLT100 BBGR4 0707L1_PKSCBNG2 168 0 22 159 154 388 46 101

21 RBLT132 BBGR4 PC458_PLZJAMBU2 2 0 0 0 0 1 210 100

22 RBLT120 BBGR2 MC135_BOGORSLK 241 0 123 450 251 55 299 93

23 RBLT235 BBGR2 PC457_PLZ_INDAH 117 55 13 130 244 198 165 91

24 RBLT38 BBGR4 PC775_ITCCIBING 18 15 3 21 4 2 4 38

25 RBLT112 BBGR2 PC454_BGRPLAZA 146 16 45 87 87 55 94 33

26 RBLT24 BBGR4 0732_CILODNGDPK 95 54 70 65 148 0 0 25

No RBLT BSC Sitename

Error seconds per day

Daily Number

of errored

seconds (ES)

at local end.


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CONCERN Overshooting Cells causing Drop Calls

FINDINGS

36 Cells were recommended for Down-tilting Activities

ACTION

Down Tilting activities was implemented on Feb 22-24, 2012 22 cells were Improved and 14 cells were Maintained

RESULT

Drop Call due to Quality and Signal Strength were reduced after the activity

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Page 68

Examples of KPI

improvement due to

Down-tilting activities


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CONCERN

Low SDCCH Success Rate (SDSR) was noticed on Site 2413931_CKBKSST

FINDINGS

No TCH and SDCCH Traffic with the site and only the BCCH is working due to Stolen Feeder

ACTION

FOP immediately requested a new feeder on Mar 12, 2012 New Feeder installed on Mar 15, 2012

RESULT The Traffic and SDSR Performance was normalized

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SDSR improved

after new feeder

cable was

installed.


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CONCERN

High TCH Blocking and low TCH availability for Cell 51390 (MC139)

FINDINGS

Identified site cascading issues between MC139 and PC454 PC454 was experiencing intermittent transmission problems

ACTION PC454 was de-cascaded with MC139 on Mar 9, 2012

RESULT

Cell 51390 (MC139) TCH Blocking was minimized upon de-cascading of site MC139 to PC454

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Page 72

TCH Blocking was

minimized upon de-

cascading of site

MC139 to PC454.


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SHORT QUIZ ON GSM

OVERVIEW

GOODLUCK ENGINEERS !

Thank you www.huawei.com

2g Rno Workshop for Pths_rev2

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Transcript of 2g Rno Workshop for Pths_rev2