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8/6/2019 Radio Optim

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Operation and Optimization Guide for@ y v S h q v T y v

@ Alcatel CIT File Reference Version Date PageMobile Communication Division 0000b02a.doc 3DF 00963 0001 TQZZA 01 09/01/98 1

All rights reserved to Alcatel. Passing on and copying of this document, use and communication of its contents not permitted without written authorization of Alcatel.

Operation and Optimization Guidefor @ W P G D V H S 6 9 D P T P G V U D P I T

Author:

P.GODET

Date and Signature: Authorised by:

C.GUETIN

Date and Signature:

H.DERREY


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REVISION HISTORY

Document Reference Date Author Ed. Modification

8BL 00460 0000 PCZZA

(+Sheets : 8BL 00460 1xxx PCZZA &

8BL 00460 2xxx PCZZA)

11/95 M. Eude /

P. Godet /

D. Collin

01 Creation for BSS Release 2

3DF 00963 0001 TQZZA

(+Sheets : 3DF 00963 1xxx PCZZA &3DF 00963 2xxx PCZZA)

12/97 M.Eude / P. Godet

01 Update for BSS Release 3 and 4


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CONTENTS

1. INTRODUCTION......................................................................................................................................................... 4

1.1. SUBJECT ................................................................................................................................................................... 4

1.2. SCOPE....................................................................................................................................................................... 4

1.3. REFERENCES ............................................................................................................................................................. 4

2. INDICATORS.............................................................................................................................................................. 5

2.1. OMC-R INDICATORS................................................................................................................................................. 6

2.2. INTERFACE A INDICATORS ......................................................................................................................................... 8

3. METHODOLOGY .................................................................................................................................................... 10

3.1. EVALUATION PROCESS............................................................................................................................................ 10

3.2. INDICATOR EVALUATION PRIORITIES........................................................................................................................ 10

3.2.1. Operation & Maintenance Indicators .............................................................................................................. 11

3.2.2. System - Radio Quality of Service Indicators ................................................................................................... 11

3.2.3. Radio Optimization Indicators ......................................................................................................................... 11

3.3. DEFINITION OF MONITORING CONTENT .................................................................................................................... 12

3.3.1. Operation & Maintenance Indicators .............................................................................................................. 12

3.3.2. System- Radio Service Quality Indicators ........................................................................................................ 12

3.3.3. Radio Optimization Indicators ......................................................................................................................... 12

3.4. INDICATOR EVALUATION ......................................................................................................................................... 12

4. INDICATOR EVALUATION SHEETS..................................................................................................................... 13

4.1. LIST OF OPERATION/MAINTENANCE SHEETS ............................................................................................................. 13

4.2. LIST OF SYSTEM - RADIO QUALITY OF SERVICE SHEETS............................................................................................. 134.3. LIST OF RADIO OPTIMIZATION SHEETS ...................................................................................................................... 14

4.4. LIST OF ADDITIONAL EVALUATION SHEETS .............................................................................................................. 14

5. APPENDICES............................................................................................................................................................. 15

5.1. O-XX SHEETS ON OMC-R COUNTERS ....................................................................................................................... 15

5.2. A-XX SHEETS ON INTERFACE A COUNTERS ............................................................................................................... 16


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1. INTRODUCTION

1.1. Subject

This document provides evaluation methodology for the quality of service information supplied by the system(OMC-R counters) or by an external analysis of the system (interface A).

It specifies the applicable indicators, and their priority of evaluation and establishes how to evaluate each toreach an accurate understanding of any problem encountered.

1.2. Scope

This document is applicable to Alcatel BSS equipped with the R3 software version (including R3.0, R3.1, R3.2,R3.3) and also with release B4

1.3. References

[1] BSS Definition of Quality of service Indicators for BSS R3.0/3.1 8BL 00601 0003 MPZZB Rev. 01[2] BSS Definition of Quality of service Indicators for BSS R3.2/3.3 8BL 00601 0004 MPZZB Rev . 02

[3] BSS Definition of Quality of service Indicators for BSS B4.0 8BL 00601 0004 MPZZB Rev. 02

[4] AGLAE software User Manual 8BL 00600 0003 HAZZA Rev. 2.1

[5] Default Radio Parameters for Release 3 , 3DF 00942 0001 PQZZA Ed. 2.1

[6] Default Radio Parameters for Release 4 , 3DF 00942 0001 PQZZA Ed. 3.0


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2. INDICATORS

There are two classes of indicator :- those based on OMC-R counters,- those based on Interface A analysis.

Starting with Release 3, all major indicators can be reached using OMC-R counters. Therefore, A-Interfaceindicators will be mainly used for deep investigations. Nevertheless, all sheets concerning these indicatorsremains in this document, as A Interface monitoring may remain a major input for QoS monitoring.

The acceptable quality threshold established for each indicator can be used to prompt highlighting of sub-systems when quality of service is downgraded. These thresholds are only meaningful if the number of samplesused to calculate them is sufficient.

The following table presents the indicators required for quality of service monitoring and optimization.

- The names of indicators are the one given in document [1] or [2], please refer to these documents to have fullinformation concerning definition and computation of these indicators.

- The given thresholds have relatively high levels adapted for the start of optimization. They will be modifiedindividually once all problems inherent to an indicator have been solved.

A method to determine the new threshold for an indicator is to take the average value of the indicator for thenetwork and update it periodically (every month).

- The minimum sample is the minimum transactions assumed attempted to consider the failure ratesignificant (transaction = OC, TC, HO IN, HO OUT).

- The range represents the entity on which the test is be performed: on a whole BSC, on a BTS.


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2.1. OMC-R Indicators

Indicators Threshold MinimumSample

BTS/BSCRange

Period Comments Sheets

1 - Operation /Maintenance

TRAFFIC SDCCH (low) 0 BTSaverage =50

BTS hour / day min. sample = nb ofcalls / BTS of the BSC

O-10

HO TRAFFIC RATE > 90%

< 10%

BTS hour/day isolates cells with onlyHO traffic, or without /too low HO traffic

O-20

O-21

SDCCH ACCESS FAIL

RATE

25% 2000 BTS day based on 20 hours of

observation

O-60

SDCCH CONGESTION 2% BTS day O-61, 62

TCH ASSIGNMENTFAILURE RATE

5% 50 BTS day -1% if no more BTSpresent

O-43

TCH ASSIGN FAIL CONG 5% BTS day with hour by hourdistribution

O-31

number of TCH allocationper TCH

< 50% 10 * nb TCH BTS/TS day TCH allocated lessthan 50% of average

O-50

TCH MEAN HOLDINGTIME per TCH

10 sec. 10calls/TCH

BTS/TS day O-52

TCH MEAN HOLDINGTIME per FU

< 60% 500 BTS/FU week average duration of 1FU < 60% of BTSaverage duration

O-51

SDCCH AVAILABILITY < nominalconfig.

BTS day O-30

TCH AVAILABILITY

ACH AVAILABILITY

< nominalconfig.

BTS

BSC

day O-30

INCOMING INTRA/INTERBSC HO FAIL BSS

2% 50 BTS day -1% on threshold if nomore alerts

O-41,O-43

CALL DROP BSS 1% 50 BTS hour/day -0.5% on threshold ifno more alerts O-40

SDCCH DROP BSS 1% 50 BTS hour/day -0.5% on threshold ifno more alerts

O-63

OUTGOING HOINTRA/INTER FAIL RATE

>15% 50 BTS day O-44

HO CAUSE = Interference >10% 100 BTS day samples = totalnumber of HO

O-70


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Indicators Threshold Minimumsample

BTS/BSCRange


2 - Quality of Service

CALL SETUP SUCCESSRATE

< 95% 50 BTS day/week +1% on threshold if nomore alerts

O-200

CALL DROP 4% 50 BTS day/week -1% on threshold if nomore alerts

O-100

SDCCH DROP 5% 50 BTS day/week -1% on threshold if nomore alerts

O-201

TCH ASSIGNMENTFAILURE RATE

3% 100 BTS day/week -1% on threshold if nomore alerts

O-202

TCH ASSIGN FAIL CONG 2% BTS day with hour by hourdistribution

O-31

SDCCH ACCESS FAILRATE

20% 50 BTS week O-60

3 - Radio Optimization

TCH ERLANG >90%capacity

2% block.

--- BTS week average on a week ofdaily busy hours :for cell dimensioning

SDCCH ERLANG

SDCCH CONG RATE

>90%capacity

0.5%

block.


O-210

AGCH LOAD > 60%capacity


O-211

PCH LOAD > 60%capacity


O-212

OUTGOING HO DROPRATE

2% 50 BTS week -1% on threshold if nomore alerts

O-80

INTRA/INTER BSC OUTHO FAIL REVERSION


O-81

INC INTRA/INTERHANDOVER EFFICIENCY


O-82

HO CAUSE = QualityUL+DL

> 30%

causes100 BTS week -5% on threshold if no

more alertsO-71

HO CAUSE = LevelUL+DL

> 40% causes

100 BTS week -5% on threshold if nomore alerts

O-72

HO CAUSE = Better Cell < 20% causes

100 BTS week +5% on threshold ifno more alerts

O-73


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2.2. Interface A Indicators


BTS/BSCRange


1 - Quality of Service

OC BSS Failure (establ.) > 5% 100 BSC hour 4% if no BSC left A-23

OC BSS Failure (establ.) > 5% 100 BTS day 4% if no BTS left A-23

OC BSS System failure > 1% 100 BSC hour A-20

OC BSS System failure > 1% 100 BTS day A-20

OC BSS failureCongestion

> 2% 50 BTS hour % blocking A-21

OC BSS failureCongestion

> 1% 100 BTS day A-21

OC NSS Failure > 5% 100 BSC hour A-22

OC NSS Failure > 3% 100 BTS day A-22

TC Failure > 5% 100 BSC hour 4% if no BSC left

TC Failure > 5% 100 BTS hour 4% if no BTS left

Call Drop(OC + TC + HO in )

> 4% 50 BSC hour 3% if no BSC left A-10

Call Drop(OC + TC + HO in )

> 4% 50 BTS day 3% if no BTS left A-10


BTS/BSCRange

Period Comments

2 - Optimization / Traffic

Call Mix(OC/TC/LNU/LPU/HO int-ext)

--- --- Network month generation of networkcall mix table, fordimensioning purpose

Nb LU per Call > 5 BSC week whole BSC maychange LA

O-210

Nb LU per Call > 10 BTS week Cell may change LA O-210


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BTS/BSCRange


3 - Optimization /Handovers

HO incoming GlobalFailure (*)

> 25% 50 BTScouple

week check with failures inreverse direction.

HO out Rev. Old Channel(*)

> 15% 100 BTSsource

week -5% if no BTS left,etc.

O-81

HO out Rev. Old Channel

(*)

> 20% 100 BTScouple

week -5% if no couple left O-81

HO out Call Drop (= HOout Global Fail - HO outrev. old) (*)

> 2% 100 BTSSource

week -1% if no BTS left,etc.

O-80

Nb neighbour cell used < 2 BTS day (int + ext BSC) O-21

HO out Cause UL QUAL > 20% 50 BTScouple

week with respect to thesum (HO causes)

O-71

HO out Cause DL QUAL > 20% 50 BTScouple

week O-71

HO Cause UL LEV > 50% 50 BTScouple

week with respect to thesum (HO causes)

O-72

HO Cause DL LEV > 40% 50 BTScouple

week O-72

HO Cause Better Cell < 20 % 50 BTScouple

week O-73

(*) Also reachable using OMC-Rcounters Type 26 and 27


BTS/BSCRange


4 - Causes of Failure

OC CLR REQ Eqpt Fail > 0.5% 500 BSC day Alerter A-40

OC CLR REQ Eqpt Fail > 2% 100 BTS day Alerter A-41

OC CLR REQ Rad.Itf Fail > 5% 100 BTS day for detailedevaluation

A-42

OC CLR REQRad.Itf.MsgFail

> 2% 100 BTS day for detailedevaluation

A-43

OC ASFAI Rev Old Chan > 5% 100 BTS day Alerter A-46

OC ASFAI Terr RessUnavail

0.5% 100 BSC day for detailedevaluation

A-44

OC ASFAI CIC alreadyalloc.

0.0% 100 BSC day for detailedevaluation

A-45


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3. METHODOLOGY

This chapter will establish a methodology to evaluate the information provided by the counters detailed above:- evaluation process,- which priority for evaluating indicators,

- how often and with which observation content (time history),- how to evaluate and correlate different data.

3.1. Evaluation Process

The quality of service monitoring and optimization process is performed as follows:1 - systematic daily (hourly) monitoring of OMC-R counters,

or systematic (periodic) monitoring of interface A,2 - setting up of alerters based on indicators and related thresholds to permit rapid discovery of BTS

or BSC with problems and to rapidly identify the problem: operation, system or radio,3 - periodic reporting of the Top 10 or Top 20 BTS by type of problem, even if acceptable

quality level thresholds have not been exceeded,

4 - evaluation of each subsystem which has triggered an alert according to the indicator prioritiesdefined in the following section:4.1 - correlation with other measurements and indicators as discussed in the evaluation sheets,4.2 - traces at interfaces :

A if detailed causes are neededABIS if radio measurements information are needed (fine tuning)

4.3 - drive tests/ spectrum analysis at last if problem identification needs geographicalpositioning, or neighbouring information that are not available using ABIS measurements.

5 - identification of solutions and determination of the most effective solution when several solutionsare available,

6 - confirmation of the correction.

3.2. Indicator Evaluation Priorities

Network availability and network resource problems, as well systems analysis should be addressed first. Theseproblems are Operation & Maintenance problems and require optimum reactivity.

Next priorities is given to serious degradation of service quality, as follows:- dropped calls,- call set-up failures.

Finally, all other causes of QoS (Quality of Service) degradation, which are more directly related to networkoptimization, should be evaluated:

- Handover failures,- cause of Handover,- dimensioning evaluation to avoid future degradation

We recommend evaluating indicators in the following order:1 - Operation-Maintenance indicators,2 - System - Radio Quality of Service Indicators,3 - Radio Optimization indicators.


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3.2.1. Operation & Maintenance Indicators

P1.1: No or insufficient TRAFFIC SDCCH or TRAFFIC TCH over one cell

P1.2: HO TRAFFIC RATE too high (Traffic on HO only) or too low (no HO on the cell)

P1.3: SDCCH/TCH AVAILABILITY : nb resources below nominal configuration - SDCCH/TCH congestion

P1.4: TCH ASSIGNMENT FAILURE RATE too high - EFFICIENCY OF INCOMING HANDOVERS too low(look mainly after system problems)

P1.5: Time slots blocked (never allocated) or with too short average seizure time

P1.6: SDCCH ACCESS FAIL RATE - SDCCH CONGESTION

P1.7: HO CAUSE = Interference too high

3.2.2. System - Radio Quality of Service Indicators

P2 - CALL DROP RATE too high at one cell OMC-R or Interface AP2.1: SystemP2.2: Radio + Handover

P3 - CALL SETUP SUCCESS RATE too low at one cell OMC-R or Interface AP3.1: System (BSS, NSS)P3.2: CongestionP3.3: Radio

3.2.3. Radio Optimization Indicators

P4 - inaccurate dimensioning for signalling and control channels OMC-R countersP4.1: SDCCH CONGESTIONP4.2: AGCH LOADP4.2: PCH LOAD

P5 - Handover failure rate at one cell OMC-R countersP5.1: OUTGOING HANDOVER DROP RATEP5.2: INTRA/INTER BSC OUTGOING HO FAIL REVERSIONP5.3: INC INTRA/INTER BSC HO FAIL RADIO

P6 - Causes of outgoing Handovers at a cell OMC-R countersP6.1: HO CAUSE = Quality rate too high - ( + HO CAUSE = interference)P6.2: HO CAUSE = Level rate too highP6.3 : HO CAUSE = Better Cell too low (too high rate of other causes of HO : concentric cells, micro

cells HO)


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3.3. Definition of Monitoring Content

3.3.1. Operation & Maintenance Indicators

Recommended Hourly

Maximum: Daily

Observation: Alert = hour-by-hour indicator for the cell with alert on 24 hoursor Alert = day-by-day indicator displayed over last week (7 days minimum)

Evolution = day-by-day indicator over four weeks

3.3.2. System- Radio Service Quality Indicators

Recommended Daily

Maximum: Weekly

Monitoring: Alert = day-by-day indicator over one week for the cellEvolution = week-by-week indicator for each cell

3.3.3. Radio Optimization Indicators

Recommended Weekly

Observation: Alert = week-by-week indicators for the cellEvolution = same + monthly evolution

3.4. Indicator Evaluation

Indicators should be evaluated in the order of priority set forth in the preceding chapter.

The indicators mentioned may be covered by several evaluation sheets, each corresponding to a specificphenomenon or situation encountered.

Refer to the appropriate evaluation sheet to evaluate a specific indicator.

Each evaluation sheet provides a list of investigations to be performed and the order in which they should beperformed:

- if the problem description and/or results of investigation does not correspond to the problemencountered, go to the following item in the sheet.

- if a problem corresponds to the current one listed in the sheet, perform the suggested action; theevaluation is then completed for the current sheet.

An evaluation sheet may call out another sheet based on the correlation of events encountered.


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4. INDICATOR EVALUATION SHEETS

The O-xx sheets correspond to observations made from OMC-R counters.

A-xx sheets correspond to observations made from Interface-A counters.

4.1. List of Operation/Maintenance Sheets

P1.1: No or insufficient TRAFFIC SDCCH or TRAFFIC TCH over one cellO-10: No or abnormally low traffic on one cell,

P1.2: HO TRAFFIC RATE too high (Traffic on HO only) or too low (no HO on the cell)O-20: Cell routing traffic on HO only.

O-21: Cell performing no Handovers

P1.3: SDCCH/TCH AVAILABILITY : nb resources below nominal configuration - SDCCH/TCH congestionO-30: Loss of resources,O-31: TCH congestion (abnormal congestion).

P1.4 - TCH failure rate - Handover failure rate:O-40: High Call Drop BSS on a cell,O-41: High rate of HO in, intra- or inter-BSC failures,O-43: High rate of TCH and HO in failures,O-44: High rate of HO out, intra- or inter-BSC failures.

P1.5 - Time slots blocked (never allocated) or with excessively short seizure times:O-50: TCH(s) never busy on an FU,O-51: RTCH seizure time too short,O-52: RTCH always busy.

P1.6 - SDCCH FAILURE RATE - SDCCH CONGESTION RATE - SDCCH DROP RATEO-60: Excessive SDCCH failure rate (close to 100%),O-61: SDCCH saturation,O-62: Sporadic SDCCH saturation.O-63: SDCCH DROP BSS too high

P1.7 - Excessive interference HO rate:O-70 Cell with a high interference HO rate.

4.2. List of System - Radio Quality of service SheetsP2 - Call drop rate at a cell:

A-10: Excessive call drop rate.O-100: Excessive call drop rate

P3 - Call set-up failure rate at a cell:

A-20: OC BSS failure rate due to the system,A-21: OC BSS failure rate due to congestion,A-22: Rate of OC NSS failure,A-23: Rate of OC BSS failure due to radio problems.

O-200: CALL SETUP SUCCESS RATE too low


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O-201: SDCCH DROP RATE too highO-202: TCH ASSIGNMENT FAILURE RATE too high

4.3. List of radio Optimization SheetsP4 - Inaccurate Dimensioning of signalling and control channels

O-210: SDCCH CONGESTIONO-211: AGCH Load too highO-212: PCH Load too high

P5 - Handover failure rate at a cell:

O-80: Outgoing HO drop rate,O-81: Outgoing HO Failure rate with reversion to old channel,

O-82: HO incoming (radio) failure rate.P6 - Causes of outgoing Handover at a cell:

O-71: Excessive HO Quality rate,O-72: Excessive HO Level rate,O-73: Low HO Better Cell rate.

4.4. List of Additional Evaluation Sheets

Evaluation of the principal causes of A-Interface failure :

A-40: CLR REQ Equipment Failure over the entire BSC,A-41: CLR REQ Equipment Failure at one or more isolated BTS,A-42: CLR REQ Radio Interface Failure at a BTS,A-43: CLR REQ Radio Interface Msg Failure at a BTS,A-44: ASS FAIL Terrestrial Resource unavailable at a BTS,A-45: ASS FAIL Terrestrial Circuit Already Allocated at a BTS,A-46: ASS FAIL Reversion Old Channel at a BTS.


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5. APPENDICES

5.1. O-xx Sheets on OMC-R counters

Sheet Document Number

Sheet O-10 3DF 00963 2010 TQZZA































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5.2. A-xx Sheets on Interface A counters

Sheet Document number

Sheet A-10 3DF 00963 1010 TQZZA












END of DOCUMENT

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