BSS_QoS_GSM_B9_Ed1

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CENTRAL OPERATIONS DEPARTMENT RELEASE B9

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

PROFESSIONAL CUSTOMER SERVICES

BSS - DEFINITION OF QUALITY OF SERVICE INDICATORS

RELEASE B9

_____________________

GSM NETWORK MONITORING

Appraisal and approvalauthorities

PCS Manager E. Desblancs PCS STO F. Jarreau PCS/2G F. Colin

DD-MM-YY DD-MM-YY DD-MM-YY


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REVISION HISTORY

Date Reference Author Origin Comment

07-09-94 Ed. 1 Creation

30-10-95 Ed. 02 Update R2.0

30-09-96 ED.038BL 00601 0003

Update R3.0 This version treats new OMC-R Release 3 counters

(after review).For A-Interface point of view, new Release 3 featureshave been addedNSS indicators have been removed.

21-04-97 Ed.04 It.01Draft8BL 00601 0004

Update R3.2 Update of Ed.03 to take into account modifications inR3.2 counters description +Comments of : JNC

30-05-97 Ed.04 It 028BL 00601 0004

Update R3.2 Update of edition 01, taking into account comments of

It.01 and Monitoring of Concentric Cells andMicrocellular specific indicators

31/07/97 Ed.05 It 018BL 00601 0005

Update R4.0 Update of Edition 4, taking into account modificationsof counters from R3.2 to R4.0 (new counters, newdefinition). In particular, some new indicators related

to concentric cells have been added, as well as new A-Interface indicators.

15/09/97 Ed.05 It 028BL 00601 0005

Update R4.0 Corrections after review : comments from CG + JNC

31/11/98 Ed.06 It 018BL 00601 0006

P. Pelouas Update B5 Update of Edition 4, taking into account modificationsof counters from B4 to B5 (new counters, new

definition) + new features B5 + Reference nameEd.06 It 028BL 00601 0006

P. Pelouas Update B5 Update of Edition 5, taking into account commentsfrom B.Viviand, P.Godet and V.Royer.

29/10/99 Ed.07 It 018BL 00601 0007

J-N Lignon Update B6.2 Update of Edition 6 (first draft), taking into accountmodifications of GSM counters from B5 to B6.2 (newcounters, new definition) + new features GSM B6, and

GPRS counters.

08/12/99 Ed.07 It 028BL 00601 0007

Released

J-N Lignon Update B6.2It01

GSM counters definition (previously scheduled inSMG 29) and comments from JN. Charneau, P.Pelouas, V. Royer, F. Colin.

1/09/01 Ed.07 It 038BL 00601 0007

Released

B DopazoS. Rabillard

Update B6.2It 02

Update of Ed 07, taking into account modifications ofGSM counters.Update of Edition Ed 07 taking into accountmodifications and restrictions of GPRS counters .

12/11/01 Ed.08 It 018BL 00601 0008

B. DopazoS Rabillard

Update B7.2 Update of Edition 7 taking into account modificationsof GSM and GPRS counters from B6.2 to B7.2 (newcounters, new definitions) + new GSM and GPRSfeatures


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01/03/04 B. Dopazo Update B8 Split of the "BSS Definition of QoS indicators"document in two parts: one part dedicated for GSM

and another one for GPRS & EDGE.This document updated for the B8 corresponds to theGSM part.

06/12/04 B. Dopazo Update B8Ed 1

Addition of indicators mapped on counters from Type18 & 19 introduced in B8 MR4 in the RNO tool.Modifications of the TCH Assign Request indicator

and all indicators using this one according to the firstB8 results - See Appendix C for detailed explanations.

20/02/06 3DF 01905 2910VAZZA

Ed1

L. Santos

P. DuarteN. Marques

Update B9 Update of last edition of B8 version document (8BL00601 0007 TQZZA) taking into account modificationsof GSM counters from B8 to B9 (new counters, newdefinitions) + new GSM features.


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TABLE OF CONTENTS

REVISION HISTORY .......................................................................................................21SUBJECT - SCOPE - REFERENCES .................................................................................8

1.1 SUBJECT ...................................................................................................................... 81.2 SCOPE81.3 APPLICABLE AND REFERENCE DOCUMENTS ........................................................................... 8

2GENERAL.....................................................................................................................92.1 PURPOSE OF QOS INDICATORS......................................................................................... 92.2 TYPES OF QOS INDICATORS ............................................................................................. 92.3 OVERVIEW OF QOS INDICATORS DIFFERENCIES BETWEEN B8AND B9 .................................. 10

2.3.1

Improvement 1: Load based 3g HO filtering ........................................................... 10

2.3.2 Improvement 2: Electromagnetic Environment (EME) Supervision B9.........................102.3.3 Improvement 3: introduction of rms counters for amr monitoring.............................. 102.3.4 Improvement 4 : new rms counters for timing advance analysis ............................... 112.3.5 Improvement 5 : RMS improvements on Trx power statistics .....................................112.3.6 Improvement 6: Intracell HO cause 30 ................................................................... 112.3.7 Improvement 7: autonomous packet resource allocation.......................................... 11

3INDICATORS..............................................................................................................123.1 INTRODUCTION ........................................................................................................... 12

3.1.1 OMC-R Counters retrieval......................................................................................123.1.1.1 BSS Counter types.......................................................................................................................................123.1.1.2 Measurement Activation at OMC-R..............................................................................................................12

3.1.2 Classification and naming conventions ...................................................................173.1.2.1 Classification..............................................................................................................................................173.1.2.2 Naming conventions ...................................................................................................................................183.1.2.3 QOS Description template...........................................................................................................................183.1.2.4 Formalism of telecom procedures ................................................................................................................19

3.2 TRAFFIC LOAD AND TRAFFIC MODEL INDICATORS ............................................................ 203.2.1 SDCCH traffic .......................................................................................................20

3.2.1.1 General presentation ..................................................................................................................................203.2.1.2 Traffic model ..............................................................................................................................................213.2.1.3 MS Penetration rate.....................................................................................................................................253.2.1.4 Resource occupancy....................................................................................................................................26

3.2.2 TCH Traffic ........................................................................................................... 273.2.2.1 General presentation ..................................................................................................................................273.2.2.2 Speech Version and Channel Type...............................................................................................................283.2.2.3 Traffic model ..............................................................................................................................................313.2.2.4 Resource occupancy....................................................................................................................................343.2.2.5 High-Load duration.....................................................................................................................................36

3.2.3 SCCP resource occupancy......................................................................................373.2.4 Control Channels (PCH, RACH, AGCH) traffic ........................................................38

3.2.4.1 General presentation ..................................................................................................................................383.2.4.2 Resource load.............................................................................................................................................39

3.3 GLOBAL QUALITY OF SERVICE INDICATORS................................................................... 413.3.1 SDCCH.................................................................................................................41


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3.3.1.1 General presentation ..................................................................................................................................413.3.1.2 Assignment phase.......................................................................................................................................423.3.1.3 Handover procedure ...................................................................................................................................433.3.1.4 Established phase .......................................................................................................................................43

3.3.2 RTCH....................................................................................................................443.3.2.1 General presentation ..................................................................................................................................443.3.2.2 Assignment phase.......................................................................................................................................453.3.2.3 Handover procedure ...................................................................................................................................473.3.2.4 Queuing phase...........................................................................................................................................483.3.2.5 Pre-emption feature ....................................................................................................................................503.3.2.6 Established phase .......................................................................................................................................52

3.3.3 Call statistics .........................................................................................................543.3.3.1 General presentation ..................................................................................................................................543.3.3.2 Call Drop ...................................................................................................................................................553.3.3.3 Call Success................................................................................................................................................57

3.4 HANDOVERSTATISTICS............................................................................................... 583.4.1 Handover causes................................................................................................... 593.4.2 HANDOVER CAUSES PER ADJACENCY................................................................... 61

3.4.2.1 Outgoing Handover....................................................................................................................................613.4.2.2 Incoming Handover ....................................................................................................................................623.4.3 outgoing Handover ...............................................................................................63

3.4.3.1 General overview........................................................................................................................................633.4.3.2 Outgoing INTRA BSC intercell......................................................................................................................643.4.3.3 Outgoing INTER BSC...................................................................................................................................663.4.3.4 Outgoing INTRA intercell + INTER BSC........................................................................................................68

3.4.4 incoming Handover ...............................................................................................693.4.4.1 General overview........................................................................................................................................693.4.4.2 Incoming INTRA BSC intercell ......................................................................................................................703.4.4.3 Incoming INTER BSC...................................................................................................................................713.4.4.4 Incoming INTRA intercell + INTER BSC ........................................................................................................73

3.4.5 intracell Handover.................................................................................................743.4.5.1 General overview........................................................................................................................................743.4.5.2 Intracell ......................................................................................................................................................75

3.4.6 SDCCH /TCH Handover repartition ........................................................................ 763.4.7 Handover statistics per couple of cell......................................................................77

3.4.7.1 General overview........................................................................................................................................773.4.7.2 Indicators with counters type 180.................................................................................................................783.4.7.3 Indicators with counters type 27...................................................................................................................793.4.7.4 Indicators with counters type 26...................................................................................................................80

3.4.8 INTER PLMN HANDOVERS.....................................................................................813.4.9 3G => 2G HANDOVERS ......................................................................................82

3.5 RESOURCEAVAILABILITY INDICATORS ............................................................................ 843.5.1 General overview .................................................................................................. 843.5.2 Dynamic SDDH/8 Timeslots ...................................................................................853.5.3 SDCCH availability................................................................................................863.5.4 TCH availability..................................................................................................... 873.5.5 A Channel Availability ........................................................................................... 88

3.6 A AND ABIS INTERFACE ANALYSIS ............................................................................. 893.6.1 ASSIGNMENT FAILURE.......................................................................................... 893.6.2 CLEAR REQUEST ................................................................................................... 903.6.3 RESOURCE OCCUPANCY......................................................................................91

3.7 SMS MEASUREMENTS............................................................................................... 923.8 SPECIFIC INDICATORS FOR DENSIFICATION TECHNIQUES ........................................................ 94


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3.8.1 Directed Retry .......................................................................................................943.8.1.1 General overview........................................................................................................................................943.8.1.2 Outgoing internal DR ..................................................................................................................................953.8.1.3 Outgoing external DR..................................................................................................................................963.8.1.4 Outgoing Internal and External DR ..............................................................................................................973.8.1.5 Incoming DR...............................................................................................................................................98

3.8.2 Indicators for Concentric Cells ............................................................................... 993.8.2.1 General overview........................................................................................................................................993.8.2.2 Indicators .................................................................................................................................................100

3.8.3 Indicators for MULTILAYER AND MULTIBAND NETWORK ......................................1023.8.3.1 General overview......................................................................................................................................1023.8.3.2 HO statistics .............................................................................................................................................1033.8.3.3 Traffic and Dimensioning ..........................................................................................................................104

3.8.4 Indicators for multiband.......................................................................................1053.8.4.1 General QoS............................................................................................................................................1053.8.4.2 Indicator overview.....................................................................................................................................1063.8.4.3 HO statistics .............................................................................................................................................1073.8.4.4 Traffic.......................................................................................................................................................109

3.9 LOCATION SERVICES............................................................................................. 1113.9.1 INDICATORS BASED ON BSC COUNTERS............................................................ 1113.10 CENTRAL OPERATIONS DEPARTMENT .................................................................... 113

3.10.1 EM exposure and compliance boundary ............................................................1133.10.2 EME indicators ................................................................................................. 113

APPENDIX A: GSM INDICATORS NAMING RULES FOR REFERENCE NAMES.............116APPENDIX B: GLOBAL VIEW OF RNO INDICTORS DIAGRAM FORMS....................1201.CCCH CHANNELS....................................................................................................1212.DYNAMIC RESOURCES............................................................................................1213.SDCCH ....................................................................................................................122

3.1 SDCCH RESOURCES.................................................................................................. 1223.2 SDCCH TRAFFIC....................................................................................................... 1233.3 TRAFFIC MODEL......................................................................................................... 1243.4 SDCCH ASSIGN ....................................................................................................... 1253.5 SDCCH HO ........................................................................................................... 1263.6 SDCCH ASSIGN & HO ............................................................................................. 127

4RTCH 1284.1 RTCH RESOURCES ..................................................................................................... 1284.2 RTCH TRAFFIC.......................................................................................................... 1294.3 SPEECHVERSION & CHANNEL TYPE ................................................................................ 1304.4 RTCH ASSIGN .......................................................................................................... 1314.5 RTCH HO .............................................................................................................. 1324.6 RTCH HO INTERPLMN.............................................................................................. 1334.7 RTCH ASSIGN & HO................................................................................................. 1344.8 RTCH QUEUING....................................................................................................... 1354.9 DIRECTED RETRY ........................................................................................................ 1364.9.1 Incoming DR ....................................................................................................... 136


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4.9.2 Outgoing DR.......................................................................................................1374.9.2.1 Internal.....................................................................................................................................................1374.9.2.2 External ....................................................................................................................................................1384.9.2.3 Internal & External ....................................................................................................................................139

5HANDOVER .............................................................................................................1405.1 HANDOVERCAUSES................................................................................................... 1425.2 INTRACELL HO ......................................................................................................... 1435.3 OUTGOING HO ....................................................................................................... 144

5.3.1 External .............................................................................................................. 1445.3.2 Internal............................................................................................................... 1455.3.3 Internal & External...............................................................................................146

5.4 INCOMING HO......................................................................................................... 1475.4.1 External .............................................................................................................. 147

5.4.1.1 External 2G/2G........................................................................................................................................1485.4.1.2 External 3G/2G........................................................................................................................................149

5.4.2 Internal............................................................................................................... 1505.4.3 Internal & External...............................................................................................151

5.4.3.1 Multiband Internal & External ....................................................................................................................1526INDICATORS PER ADJACENCIES..............................................................................153

6.1 HANDOVERCAUSES ................................................................................................... 1536.2 INCOMING HANDOVER- TYPE180 ................................................................................ 1546.3 INCOMING HANDOVER TYPE27 .................................................................................. 1546.4 OUTGOING HANDOVER TYPE26................................................................................. 154


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1 SUBJECT - SCOPE - REFERENCES

1.1 SUBJECT

This document provides:

The list of main indicators required and advised for BSS Quality of Service monitoring for GSM networks

The definition of each indicator computation rule

The RNO references of each indicator.

1.2 SCOPE

This document is applicable to the ALCATEL BSS equipped with the B9 BSS software version.

1.3 APPLICABLE AND REFERENCE DOCUMENTS

N Reference Ed. Title

1 3BK 10204 0613 DTZZA 1 Counter improvements for release B9

2 3BK 11203 0085DSZZA3BK 11203 0102DSZZA

07 BSC counters catalogue release B9


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2 GENERAL

2.1 PURPOSE OF QOS INDICATORS

An indicator is a value based on one or more observation counters and that is representative either of system performance(BSS) or subscribers point of view. The counters are either assigned to the system itself or to analysers external to thesystem.

The service quality indicators have five major purposes:

Identify occasional faults on a subsystem (BSS, BTS) and establish corrective action (operating instruction or corrective

maintenance) required to restore service quality;

Detect and identify recurrent system faults to define corrective action and/or palliative action;

Detect and identify radio problem on a cell, to help Radio Tuning teams to analyse radio situation and define correctiveaction (new frequency, antenna modification, parameter adjustment, ...);

Monitor system changes in terms of :

- load- efficiency- traffic model

- gain obtained by a software update or network modification;

Predict network behavior according to traffic evolution (undersizing, overload, etc.).

2.2 TYPES OF QOS INDICATORS

Two main groups of QoS indicators have been identified to meet the above objectives:

Global BSS network surveillance indicators: These are used to indicate the quality of service provided to subscribersand identify failures and their causes for the entire network and for each BSS. These counters should be managed at theNSS or BSS level, we will discuss here about BSS level only ;

Detailed BSS surveillance indicators: they are used to identify the causes of individual failures for each BSS and eachcell. This can be used to isolate local problems in a subsystem (for corrective maintenance purposes), generic failuresdue to a specific software version, or appreciate subsystem loads.


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2.3 OVERVIEW OF QOS INDICATORS DIFFERENCIES BETWEEN B8 AND B9

2.3.1 IMPROVEMENT 1: LOAD BASED 3G HO FILTERING

In B9 it was introduced more counters for inter-rat (UMTS to GSM) handover monitoring. The new counters were

introduced in MC922 family:

MC922e (type 110): NB_INC_EXT_TCH_3G_2G_HO_EMERGENCY_REQ that indicates the number 3G to 2Gexternal inter-cell TCH (in HR or FR) handover requests, with emergency cause.

MC922f(type 110): NB_INC_EXT_TCH_3G_2G_HO_REQ that indicates the number of 3G to 2G external inter-cell TCH (in HR or FR) handover requests. This counters differs from MC922d by the fact it just count TCHhandovers.

MC922g (type 110): NB_INC_EXT_TCH_3G_2G_HO_PREP_FAIL_3GCONG that indicates the number of 3Gto 2G handover failures in preparation phase due to 3G high load in target cell.

MC922h (type 110): TIME_3G_HOReject_HL that indicates the cumulative time (in seconds) during which thecell is in 3G high load state.

2.3.2 IMPROVEMENT 2: ELECTROMAGNETIC ENVIRONMENT (EME) SUPERVISION B9

The introduction of electromagnetic environment monitoring, as B9 optional feature lead to introduction of two newcounters. The goal of this feature is to make easier evaluating power issues in BTSs.

E01 (type 33): EME_PWR_GSM that indicates the average emitted power (x0.1 Watt) at BTS antenna outputconnector, for GSM frequency band (GSM850, or E-GSM or P-GSM).

E02 (type 33): EME_PWR_DCS that indicates the average emitted power (x0.1 Watt) at BTS antenna outputconnector, for DCS frequency band (DCS1800 or DCS 1900).

2.3.3 IMPROVEMENT 3: INTRODUCTION OF RMS COUNTERS FOR AMR MONITORING

To provide a better tool to dimensioning the AMR thresholds, B9 introduce a new set of RMS counters to verify de use ofdifferent speech codecs.

RMS44a (type 31): AMR_FR_UL_BAD table of 8 results; each cell (i) of the table contains the number of AMRFR UL bad speech frames.

RMS44b (type 31): MAX_AMR_FR_UL_BAD that indicates the maximum number of bad speech frames receivedin uplink in one FR codec.

RMS45a (type 31): AMR_HR_UL_BAD table of 8 results; each cell (i) of the table contains the number of AMRHR UL bad speech frames.

RMS45b (type 31): MAX_AMR_HR_UL_BAD that indicates the maximum number of bad speech frames

received in uplink in one HR codec.RMS46a (type 31): AMR_FR_UL_RXLEV_UL that has a table of 10x8 results; each cell (i,k) of the table contains the

number of correct UL speech frames using AMR FR codec k (8 codecs) for which UL RXLEV is reported in level band i(10 level bands).

RMS46b (type 31): MAX_AMR_FR_UL_RXLEV_UL that has the 10 maximum results. Each cell Ci of the tableindicates the greatest value of the Vik for an i given in RMS46a.

RMS47a (type 31): AMR_FR_DL_RXLEV_DL that has a table of 10x8 results; each cell (i,k) of the table containsthe number of correct DL speech frames using AMR FR codec k (8 codecs) for which DL RXLEV is reported in

level band i (10 level bands).

RMS47b (type 31): MAX_AMR_FR_DL_RXLEV_DL that has a table of 10 maximum results. Each cell Ci of thetable indicates the greatest value of the Vik for a i given in RMS47a.

RMS48a (type 31): AMR_HR_UL_RXLEV_UL that has a table of 10x5 results; each cell (i,k) of the tablecontains the number of correct speech frames using AMR HR codec k (5 codecs) for which UL RXLEV is reportedin level band i (10 level bands).


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RMS48b (type 31): MAX_AMR_HR_UL_RXLEV_UL that has a table of 10 maximum results. Each cell Ci of thetable indicates the greatest value of the Vik for a i given in RMS48a.

RMS49a (type 31): AMR_HR_DL_RXLEV_DL that has a table of 10x5 results; each cell (i,k) of the tablecontains the number of correct DL speech frames using AMR HR codec k (5 codecs) for which DL RXLEV isreported in level band i (10 level bands).

RMS49b (type 31): MAX_AMR_HR_DL_RXLEV_DL that has a table of 10 maximum results. Each cell Ci of thetable indicates the greatest value of the Vik for a i given in RMS49a.

2.3.4 IMPROVEMENT 4 : NEW RMS COUNTERS FOR TIMING ADVANCE ANALYSIS

In B9 were introduced a new set of RMS counters related with timing advance analysis.

RMS50a (type 31): TPR_TIMING_ADVANCE that has a table of 10 results; each cell (i) of the table contains number ofreports in which Timing Advance is in Timing Advance band i.

RMS50b (type 31): MAX_TIMING_ADVANCE that has the greatest number of measurements in one Timingadvance band.

RMS51 (type 31): TPR_UL_RXLEV_TA_BAND that has a table of 10 results; each cell (i) of the table containsthe average value of UpLink Rxlev of reports in TA band i. Averaged Rxlev is given with a precision of 2 digitsafter the comma (step size for coding = 0.01, -110 dBm coded 0, -109.99 dBm coded 1...).

RMS52 (type 31): TPR_DL_RXLEV_TA_BAND that has a table of 10 results; each cell (i) of the table contains theaverage value of DownLink Rxlev of reports in TA band i. Averaged Rxlev is given with a precision of 2 digits after thecomma (step size for coding = 0.01, -110 dBm coded 0, -109.99 dBm coded 1...).

2.3.5 IMPROVEMENT 5 : RMS IMPROVEMENTS ON TRX POWER STATISTICS

In B9 were introduced one new counter related with TRX power statistics.

RMSpw3 (type 31): MAX_PORWER_PER_TRX gives the maximum GMSK TRX power level applied at the BTS

antenna output connector in dBm. The power takes into account the different BTS internal losses (cables, internalcombiners) and the internal/ external leveling but it does not take into account the BS_TXPWR_MAX, attenuationrequired by the OMC_R.

2.3.6 IMPROVEMENT 6: INTRACELL HO CAUSE 30

In B9 were introduced one new HO cause applied for CS calls in the Non pre-emptable PS zone. Cause 30 allows to speed

up the release of a TS carrying a CS call inside both the non pre-emptable PS zone and the MAX_SPDCH_LIMIT zone (theconcerned CS calls in the CS zone are reallocated using an intra-cell handover, cause 30.

MC480 (type 110): NB_TCH_HO_REQ_30_ReturnCSZone gives the number of TCH intracell HO cause 30requests.

MC481 (type 110): NB_TCH_HO_ATPT_30_ReturnCSZone gives the number of TCH intracell HO cause 30attempts.

2.3.7 IMPROVEMENT 7: AUTONOMOUS PACKET RESOURCE ALLOCATION

This feature introduces a new way of sharing the radio resources between the MFS and the BSC. The purpose of this featureis to give to the MFS all the radio timeslots that are usable for PS traffic, according to the whole BSS load (CS and PS

loads). The MFS needs no more to request radio timeslots to the BSC; instead the MFS is always aware of all the availableradio timeslots.


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3 INDICATORS

3.1 INTRODUCTION

3.1.1 OMC-R COUNTERS RETRIEVAL

3.1.1.1 BSS Counter types

OMC-R indicators are established from performance counters provided by the BSS.

Performance Management is a BSS facility, which provides measurements and statistics on various traffic events and

resource usage in the BSS.

The BSS has 30 types of counters organised into three classes:

Cumulative counters (C1): All events are counted when specific events occur. They are reset when a new collectionperiod is started. They indicate only the number of events that occurred during the period covered by the last report.

Statistical counters (C2): Status inspection is executed every 20 seconds. Statistical data is collected relating to thestatus of a specific resource. The counters can be rounded to closest integer or truncated to lower integer, please refer to

document ref. [2] for details.

Event observation (C3): An observation supplies detailed information on a system event. For example, the channelseizure time for an SDCCH is an observation counter. It gives the time and date when the SDCCH is seized.

For the present document, QoS monitoring indicators are derived from counter types 26, 27, 29,32, 110 and 180: thereforefrom classes C1 and C2.

The mechanisms of Performance Management counters as well as counters' availability and definition are detailed indocument [1] "BSS/OMC-R O&M Reference Guide"

The list of validated counters are given in document [1].

3.1.1.2 Measurement Activation at OMC-R

As usual, the permanent activation of types 110 and 180 shall be recommended with BSS B9.


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CENTR

ALOPERATIONSDEPARTMENT

RELEASEB9

AlcatelCIT

File

Reference

Date

Edition

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ge

MCG/M

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BSS

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GSM

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.doc

3DF019052910V

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01

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154

Allrights

reserved.

Passingonandcopyingofthisdocumen

t,useandcommunicationofitscontentsnotperm

ittedwithoutwrittenauthorization.

180

C1

2GTrafficFlow

measurements

Setofincomingexternalorinternalinter-cellSDCCHorTCH(inHRorFR

usage)handovercountersprovidedperadjacency:variableservingcell-

variabletargetcell.Theinternalandexternaldirectedretriesarecounted.

Onlyhandovers/directedretriesfrom2Gcellsaretakenintoaccount(i.e.

handoversfrom3Garenotcountedintype18

0).

BSC

TRUE

None


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3.1.2 CLASSIFICATION AND NAMING CONVENTIONS

3.1.2.1 Classification

The present chapter defines standard indicators that can be used to follow behaviour and Quality of any kind of GSMnetworks, equipped with Alcatel BSS in Release B9.

OMC-R Indicators can be divided into 4 basic categories:

Traffic Load and Traffic Model

Quality of service (efficiency of transactions)

Handover statistics

Resource availability

Upon these are defined indicators related to densification techniques (as Directed Retry, Concentric Cells, Micro Cells,Multiband...).

The following diagram details this classification of GSM indicators:

Upon these categories can be extracted the Global BSS indicators. They will be marked with symbol "(G)" after their name.

Control Channels

SCCP

TCH

SDCCH

Traffic load

Call statistics

RTCH

SDCCH

Global QoS

Couple of cell

SDCCH /TCH

HO repartition

Intracell HO

Incoming HO

Outgoing HO

HO causes

Handover

statistics

Resource

availability

Multiband

Multilayer / Multiband

Network

Concentric cells

Directed retry

Densification

techniques

GSM

indicators

INTERPLMN

HO

3G => 2G HO

Dynamic

SDCCH/8 TS

SDCCH

availability

RTCH

availability

A Channel

availability


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3.1.2.2 Naming conventions

In the following description, the symbol "cell

" means the sum for a subset of cells:

- the cell itself for a cell level indicator- sum of the cells of a BSC for a BSS level indicator

- sum of all cells of network for a network level indicator

In the same way:

the symbol "TRX

" means the sum for a subset of TRXs:

- all TRXs of a cell for a cell level indicator

- all TRXs of the cells of a BSC for a BSS level indicator

- all TRXs of the cells of network for a network level indicator

the symbol "TS

" means the sum for a subset of Time Slots of same type (SDCCH, TCH, ...)

- all timeslots of a TRX for a TRX level indicator- all timeslots of a cell for a cell level indicator

- all timeslots of the cells of a BSC for a BSS level indicator

- all timeslots of all cells of network for a network level indicator

For the Microcellular indicators, the formula convention is the following:

x-> cell micro

(Cxx) means: sum of values of counters Cxx from microcell x to any other microcell.

3.1.2.3 QOS Description template

GSM indicator will be described as follows:

INDICATOR Indicators' name

DEFINITION Indicators' definition according to their category

FORMULA Indicators' computation with OMC-R counters (whatever PM Type counter belongs to)

THRESHOLD Threshold(s) for acceptable quality (upon this threshold, alert should be triggered)

COMMENT Comments

REF NAME Common reference name for methods, A956-

RNO1

UNIT Number, %, second,

Erlang

1Naming rule for reference name is detailed in Appendix A


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3.1.2.4 Formalism of telecom procedures

The same formalism is used for all telecom procedures (immediate assignment, normal assignment, handover, directed

retry), for consistency purposes.

Telecom procedure

-ATTEMPT

Telecom procedure

-SUCCESS

Telecom procedure

-whose channel is

ALLOCATED in BSC

channel activation failure

assignment/HO execution

failure

PREPARATION phase

EXECUTION phase

failure in channel

established phase

the MS has seized

the channel

- radio link failure

- handover execution failure

(with or without reversionto the old channel)

- BSS problem

- NSS problem

- radio link failure

- BSS problem

- NSS problem

Telecom procedure

-REQUEST

- BSS problem

- NSS problem

- congestion

no resource available

in BSC

resource available

in the BSC

channel activation

success

begin

Based on this formalism, the following general indicators formulas are deducted:

Success Rate = (Success) / (Request)

Efficiency Rate = (Success) / (Allocated)

Unsuccess Rate = (Preparation & Execution Failures ) / (Request)

Failure Rate = (Failure) / (Request)


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3.2 TRAFFIC LOAD AND TRAFFIC MODEL INDICATORS

This set of indicators provides users with:

- definition of number of transactions attempts (MOC, MTC, Handover, ...),

- traffic (in Erlang) computation for a cell, a BSC- load on traffic and signalling channels to evaluate cell and BSC channel's dimensioning

3.2.1 SDCCH TRAFFIC

3.2.1.1 General presentation

SDCCH Traffic

Traffic

MT

Traffic

MO

Loc. Update

IMSI Detach

Sup. Service

Call

Establishment

LU Follow on

SMS

Call

Re-Estab

LCS

MSPenetration Rate

Traffic

Dual Band

ResourceOccupancy

SDCCH

Erlang

SDCCH Mean

Holding TimeGlobal

Traffic

Global

Requests

TrafficModel

HandoverNormal

Assignment

Normal

Assignment

Handover

Others


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3.2.1.2 Traffic model

INDICATOR SDCCH ASSIGN REQUESTS

DEFINITION Number of SDCCH seizure requests during radio link establishment procedure.

FORMULA B9 cell

(MC148 + MC04)

THRESHOLD

COMMENT This includes requests rejected due to congestion on SDCCH.

REF NAME SDNARQN UNIT Number

INDICATOR SDCCH HO REQUESTS

DEFINITION Number of SDCCH seizure requests during incoming external and internal intercell SDCCH

handover. This includes also intracell SDCCH handovers.

FORMULA B9 cell

(MC147+MC81+MC91+MC101)

THRESHOLD


REF NAME SDHORQN UNIT Number

INDICATOR SDCCH REQUESTS

DEFINITION Number of SDCCH seizure requests during radio link establishment plus incoming external andinternal intercell SDCCH handover procedures. This includes also intracell SDCCH handovers.

FORMULA B9 SDCCH ASSIGN REQUESTS + SDCCH HO REQUESTS

THRESHOLD


REF NAME SDAHRQN UNIT Number


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INDICATOR SDCCH ASSIGN SUCCESS

DEFINITION Total number of SDCCH successfully seized by mobile during radio link establishment procedure

FORMULA B9 cell (MC01 + MC02)

THRESHOLD

COMMENT

REF NAME SDNASUN UNIT Number

INDICATOR SDCCH HO SUCCESS

DEFINITION Total number of SDCCH successfully seized by mobile during incoming external and internalintercell SDCCH handover.

FORMULA B9 cell

(MC10)

THRESHOLD

COMMENT

REF NAME SDHOSUN UNIT Number

INDICATOR SDCCH SUCCESS

DEFINITION Total number of SDCCH successfully seized by mobile during radio link establishment plusincoming external and internal intercell SDCCH handover procedures.

FORMULA B9 SDCCH ASSIGN SUCCESS + SDCCH HO SUCCESS

THRESHOLD

COMMENT

REF NAME SDAHSUN UNIT Number

INDICATOR TRAFFIC SDCCH MOBILE TERMINATED RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for any mobile terminated transaction over the totalamount of successful SDCCH seizures during the radio link establishment procedure.

FORMULA B9 cell

MC01 / SDCCH ASSIGN SUCCESS

THRESHOLD

COMMENT

REF NAME TMMTO UNIT %

INDICATOR TRAFFIC SDCCH MOBILE ORIGINATED RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for any mobile originated transaction over the totalamount of successful SDCCH seizures during the radio link establishment procedure.

FORMULA B9 cell

MC02 / SDCCH ASSIGN SUCCESS

THRESHOLD

COMMENT

REF NAME TMMOO UNIT %


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INDICATOR TRAFFIC SDCCH MO LU RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for location updating procedure (excluding follow-

on requests) over the total amount of successful SDCCH seizures by mobile for any mobileoriginated

FORMULA B9 cell

MC02a /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOLUO UNIT %

INDICATOR

DEFINITION Ratio of SDCCH successfully seized by mobile for location updating procedure, with follow-onrequest (subsequent call establishment without SDCCH release) over the total amount of successfulSDCCH seizures by mobile for any mobile originated

FORMULA B9 cell

MC02d /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOLUFO UNIT %

INDICATOR TRAFFIC SDCCH MO IMSI DETACH RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for IMSI DETACH procedure over the totalamount of successful SDCCH seizures by mobile for any mobile originated

FORMULA B9 cell

MC02g / cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOLUDO UNIT %

INDICATOR TRAFFIC SDCCH MO SMS RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for mobile originating short message service overthe total amount of successful SDCCH seizures by mobile for any mobile originated

FORMULA B9 cell

MC02b /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOSMSO UNIT %


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INDICATOR TRAFFIC SDCCH MO SS RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for mobile originating supplementary service over

the total amount of successful SDCCH seizures by mobile for any mobile originated

FORMULA B9 cell MC02c /cell MC02THRESHOLD

COMMENT

REF NAME TMMOSSO UNIT %

INDICATOR TRAFFIC SDCCH MO CALL RE-ESTABLISHMENT RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for call re-establishment over the total amount ofsuccessful SDCCH seizures by mobile for any mobile originated

FORMULA B9 cell

MC02e /cell

MC02

THRESHOLD

COMMENTREF NAME TMMOCRO UNIT %

INDICATOR TRAFFIC SDCCH MO CALL ESTABLISHMENT RATIO

DEFINITION Ratio of SDCCH successfully seized by mobile for mobile originated call establishment over thetotal amount of successful SDCCH seizures by mobile for any mobile originated

FORMULA B92 cell

MC02h /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOCEO UNIT %

INDICATOR

DEFINITION Ratio of SDCCH successfully seized by mobile for any other reason that location updating (withand w/o follow-on request), imsi detach, call establishment (moc or mtc), call re-establishment,short message service, supplementary services over the total amount of successful SDCCH seizuresby mobile for any mobile originated.

FORMULA B9 cell

MC02f /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOUKO UNIT %

INDICATOR

DEFINITION Ratio of SDCCH successfully seized by mobile for any LCS procedure over the total amount ofsuccessful SDCCH seizures by mobile for any mobile originated.

FORMULA B9 cell

MC02i /cell

MC02

THRESHOLD

COMMENT

REF NAME TMMOLSO UNIT %


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3.2.1.3 MS Penetration rate

INDICATOR SDCCH TRAFFIC DUAL BAND MS

DEFINITION Multiband MS penetration rate.

FORMULA B7.2 cell

(MC850) / cell

(MC01 + MC02 (MC02A + MC02D + MC02G))

THRESHOLD

COMMENT MC850 replaces MC150a in B7This indicator is representative of the Dual Band MS call attempts proportion in the network.

It is a good approximation considering that most of CLASSMARK CHANGE is sent on everySDCCH initial access.A MS is considered as multiband if it supports:- the P-GSM (or E-GSM or R-GSM) and the DCS1800 bands if thePLMN_FREQUENCY_BANDS parameter is set to "GSM900 and DCS1800 bands", or,

- the GSM850 and the DCS1800 bands if the PLMN_FREQUENCY_BANDS parameter is set to"GSM850 and DCS1800 bands", or,- the GSM850 and the DCS1900 bands if the PLMN_FREQUENCY_BANDS parameter is set to"GSM850 and DCS1900 bands".

REF NAME TMMSMBR UNIT %


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3.2.1.4 Resource occupancy

INDICATOR SDCCH ERLANG

DEFINITION SDCCH Erlang (1 Erl = 1 subchannel occupancy)

FORMULA B9 ts

(MC400) / observation duration in seconds

THRESHOLD < 95% of capacity (refer to Erlang table to determine capacity)

COMMENT Observation period used for QoS monitoring tools is 3600 seconds.Counter per TRX

REF NAME SDTRE UNIT Erlang

INDICATOR SDCCH MEAN HOLDING TIME

DEFINITION Average SDCCH holding time

FORMULA B9 [ ts

(MC400) /ts

(MC390) ]

THRESHOLD mean duration < T3101 implies bad SDCCH usage

mean duration > 6 seconds implies too long SDCCH usage

COMMENT Counters per TRX

REF NAME SDTRMHT UNIT Second


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3.2.2 TCH TRAFFIC


RTCH Traffic

Resource

Occupancy

TCHErlang

Full RateErlang

Full RateAllocated

Full RateMean Holding

Time

Half RateErlang

Half RateAllocated

Half RateMean Holding

Time

Blocking Peak

Ratio ofHR Traffic

TCHMultibandOccupancy

Traffic Model

REQUESTSAssign / HO / DR

SUCCESSAssign / HO / DR

HO PER CALL

REQUESTSFR, DR, DR/EFR, AMR, DATA

Speech Version&

Channel Type

ALLOCATIONSFR, HR, EFR, AMR, DATA

SUCCESSAMR / TFO

High-Load duration


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3.2.2.2 Speech Version and Channel Type

INDICATOR TCH ASSIGN FR REQUESTS

DEFINITION Number of TCH normal assignment requests from FR only mobiles.

FORMULA B9 cell

MC701a

THRESHOLD

COMMENT

REF NAME TCNARQMN UNIT Number

INDICATOR TCH ASSIGN DR REQUESTS

DEFINITION Number of TCH normal assignment requests from Dual Rate mobiles.

FORMULA B9 cell

MC701b

THRESHOLD

COMMENT

REF NAME TCNARQBN UNIT Number

INDICATOR TCH ASSIGN DR EFR REQUESTS

DEFINITION Number of TCH normal assignment requests from mobiles supporting FR, DR, EFR.

FORMULA B9 cell

MC701c

THRESHOLD

COMMENT

REF NAME TCNARQTN UNIT Number

INDICATOR TCH ASSIGN AMR REQUESTS

DEFINITION Number of TCH normal assignment requests from AMR mobiles.

FORMULA B9 cell

MC701d

THRESHOLD

COMMENT

REF NAME TCNA3RQTN UNIT Number

INDICATOR TCH ASSIGN DATA REQUESTS

DEFINITION Number of TCH normal assignment requests for data calls.

FORMULA B9 cell

MC701e

THRESHOLD

COMMENT

REF NAME TCNARQDN UNIT Number


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INDICATOR TCH ASSIGN FR ALLOCATED

DEFINITION Number of TCH normal assignment/modify in FR usage- whose channel is allocated in the BSC

FORMULA B9 cell MC702aTHRESHOLD

COMMENT

REF NAME TCNACAFN UNIT Number

INDICATOR TCH ASSIGN HR ALLOCATED

DEFINITION Number of TCH normal assignment/modify in HR usage- whose channel is allocated in the BSC.

FORMULA B9 cell

MC702b

THRESHOLD

COMMENT

REF NAME TCNACAHN UNIT Number

INDICATOR TCH ASSIGN EFR ALLOCATED

DEFINITION Number of TCH normal assignment/modify in EFR usage- whose channel is allocated in the BSC.

FORMULA B9 cell

MC702c

THRESHOLD

COMMENT

REF NAME TCNACAEN UNIT Number

INDICATOR TCH ASSIGN DATA ALLOCATED

DEFINITION Number of TCH normal assignment/modify for data- whose channel is allocated in the BSC.

FORMULA B9 cell

MC705

THRESHOLD

COMMENT

REF NAME TCNACADN UNIT Number


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INDICATOR TCH ASSIGN FR AMR ALLOCATED

DEFINITION Number of TCH normal assignment/mode modify in FR AMR usage- whose channel is allocated in

the BSC.FORMULA B9 cell

MC704a

THRESHOLD

COMMENT

REF NAME TCNA3CAFN UNIT Number

INDICATOR TCH ASSIGN HR AMR ALLOCATED

DEFINITION Number of TCH normal assignment/mode modify in HR AMR usage- whose channel is allocated in

the BSC.

FORMULA B9 cell

MC704b

THRESHOLDCOMMENT

REF NAME TCNA3CAHN UNIT Number

INDICATOR TCH ASSIGN AMR SUCCESS RATE

DEFINITION Rate of AMR call successes.

FORMULA B9 cell

(MC704a + MC704b) /cell

MC701d

THRESHOLD

COMMENT

REF NAME TCNA3SUR UNIT %

INDICATOR TCH ASSIGN TFO SUCCESS RATE

DEFINITION Rate of calls for which TFO has been successfully established

FORMULA B9 cell

MC170 /cell

(MC703 + MC15a+MC15b)

THRESHOLD

COMMENTAccording to some clarifications on counter the MC170, the formula of this indicator has been

modified. Indeed, the counter MC170 is incremented per TCH allocated and not per call.

REF NAME QSTRCCTR UNIT %


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3.2.2.3 Traffic model

INDICATOR TCH REQUESTS

DEFINITION Total number of TCH seizure requests for normal assignment, plus incoming intracell, internalintercell and external handover. This includes also internal and external DR.

FORMULA B9 TCH ASSIGN REQUESTS + TCH INCOMING HO/DR REQUESTS

THRESHOLD

COMMENT

REF NAME TCAHRQN UNIT Number

INDICATOR TCH ASSIGN REQUESTS

DEFINITION Number of TCH seizure requests for normal assignment procedure.

FORMULA B9 cell ( MC140a (MC142e + MC142f) )

THRESHOLD

COMMENT Whenever an 08.08 ASSIGNMENT REQUEST message for a normal TCH assignment is receivedfrom the MSC

MC142e + MC42f = Number of RTCH succesfully seized by the mobile during outgoing internaland external directed retry (forced or normal) procedure.In RNO tool :

- From version B8 MR5 Ed3: RTCH_assign_request = MC140a (MC142e + MC142f)

REF NAME TCNARQN UNIT Number

INDICATOR TCH INCOMING HO/DR REQUESTS

DEFINITION Total number of TCH seizure requests for incoming intracell, internal intercell and externalhandover. This includes also internal and external DR.

FORMULA B9 cell

(MC15a+MC15b) + (MC541A+MC551+MC561)

THRESHOLD

COMMENT

REF NAME TCHORQN UNIT Number

INDICATOR TCH OUTGOING HO REQUESTS

DEFINITION Number of RTCH requests during outgoing intracell, internal intercell and external handover.

FORMULA B7 MC710THRESHOLD

COMMENT Counter per TRX.

REF NAME HOOTRQN UNIT Number


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INDICATOR TCH SUCCESS

DEFINITION Number of TCH successfully seized by mobiles for normal assignment plus incoming intracell,

internal intercell and external handover. This includes also internal and external DR.FORMULA B9 TCH ASSIGN SUCCESS + TCH INCOMING HO/DR SUCCESS

THRESHOLD

COMMENT

REF NAME TCAHSUN UNIT Number

INDICATOR TCH SUCCESS END

DEFINITION Number of successful calls finished on cell.

FORMULA B9 TRX

(MC718 + MC717a + MC717b MC712)

THRESHOLD

COMMENT [ Normal Assignment + Incoming external and internal DR + Incoming intracell, internal intercell

and external HO Outgoing intracell, internal intercell and external HO] successes.Used for "Call Drop" computation.

REF NAME TCAHCCN UNIT Number

INDICATOR TCH SUCCESS BEGIN

DEFINITION Number of successful calls established on cell.

FORMULA B9 cell

(MC718 + MC717a + MC717b MC662)

THRESHOLD

COMMENT [Normal Assignment + Incoming external and internal DR + Incoming intracell, internal intercelland external HO Intracell HO ] successes.

Used for "RTCH Drop" computation.REF NAME TCAHSUBN UNIT Number

INDICATOR TCH ASSIGN SUCCESS

DEFINITION Number of TCH successfully seized by MS for normal assignment procedure.

FORMULA B9 TRX

(MC718)

THRESHOLD

COMMENT

REF NAME TCNASUN UNIT Number


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INDICATOR TCH INCOMING HO/DR SUCCESS

DEFINITION Number of TCH successfully seized by MS for incoming intracell, internal intercell and external

handover. This includes also incoming external and internal directed retry.FORMULA B9 TRX

(MC717a + MC717b)

THRESHOLD

COMMENT

REF NAME TCHOSUN UNIT Number

INDICATOR TCH INCOMING HO SUCCESS

DEFINITION Number of TCH successfully seized by MS for incoming intracell, internal intercell and external

handover. This includes also incoming external DR.

FORMULA B9 TRX

(MC717b)

THRESHOLDCOMMENT

REF NAME TCHOISUN UNIT Number

INDICATOR TCH OUTGOING HO SUCCESS

DEFINITION Number of TCH successfully seized by MS for outgoing intracell, internal intercell and externalhandover.

FORMULA B9 TRX

(MC712)

THRESHOLD

COMMENT

REF NAME TCHOOSUN UNIT Number

INDICATOR HANDOVER PER CALL (TCH)

DEFINITION Rate of successful incoming intracell, internal intercell and external handovers/directed retries persuccessful normal TCH assignment.

FORMULA B9 TCH INCOMING HO/DR SUCCESS / TCH ASSIGN SUCCESS

THRESHOLD

COMMENT This approximation, in fact ratio of TCH seizures for Handover and DR over TCH seizures fornormal assignment, is more relevant for a large number of cells.

REF NAME TMHOCO UNIT %

INDICATOR

DEFINITION Ratio of RTCH allocated for incoming external and internal handovers in relation to all RTCHallocated. This includes also incoming external and internal directed retries.

FORMULA B9 cell

(MC15a + MC15b) /cell

(MC15a + MC15b + MC703)

THRESHOLD > 90% or < 100%

COMMENT To be used as maintenance alert : access to cell only or never via Handover is generally abnormal

REF NAME TCHOCAO UNIT %


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3.2.2.4 Resource occupancy

INDICATOR RTCH ERLANG

DEFINITION RTCH Erlang (1 Erl = RTS occupancy)

FORMULA B9 TRX

(MC380a + MC380b) / observation duration in seconds

THRESHOLD < 90% of capacity

COMMENT MC380a:Time (in seconds) during which the TCH radio timeslot in FR usage is busyMC380b:Time (in seconds) during which the TCH radio timeslot in HR usage is busy. Both "HR

timeslots" are counted independently.

REF NAME TCTRE UNIT Erlang

INDICATOR TCH MEAN HOLDING TIME

DEFINITION Average RTCH seizure duration.

FORMULA B9 TRX

(MC380a+MC380b) /TRX

(MC370a+MC370b)

THRESHOLD

COMMENT MC370a: Number of times the TCH radio timeslots are allocated in FR usage.MC370b: Number of times the TCH radio timeslots are allocated in HR usage. Both "HRtimeslots" are counted independently.

REF NAME TCTRMHT UNIT Second

INDICATOR TCH FULL RATE ERLANG

DEFINITION TCH FR Erlang

FORMULA B9 TRX

(MC380a) / observation duration in seconds

THRESHOLD < 90% of capacity

COMMENT See comment above (RTCH ERLANG).

REF NAME TCTRFE UNIT Erlang

INDICATOR TCH FULL RATE ALLOCATED

DEFINITION Number of TCH allocations in FR (classical FR, EFR and AMR FR) usage, for normal assignmentor handover

FORMULA B9 TRX

(MC370a)

THRESHOLD

COMMENT See comments above (TCH MEAN HOLDING TIME)

REF NAME TCAHCAFN UNIT Number

INDICATOR TCH FULL RATE MEAN HOLDING TIME

DEFINITION Average TCH FR holding time

FORMULA B9 ts

(MC380a) /TRX

(MC370a)

THRESHOLD Maintenance alert if mean duration for a single TS < 5 sec

COMMENT See comments above

REF NAME TCTRFMHT UNIT Second


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INDICATOR TCH HALF RATE ERLANG

DEFINITION TCH HR Erlang

FORMULA B9 TRX

(MC380b) / observation duration in seconds

THRESHOLD < 90% of capacityCOMMENT See comment above (RTCH ERLANG).

REF NAME TCTRHE UNIT Erlang

INDICATOR TCH HALF RATE ALLOCATED

DEFINITION Number of TCH allocations in HR (classical HR and AMR HR) usage for normal assignment orhandover

FORMULA B9 TRX

(MC370b)

THRESHOLD

COMMENT See comments above (TCH MEAN HOLDING TIME)

REF NAME TCAHCAHN UNIT Number

INDICATOR TCH HALF RATE MEAN HOLDING TIME

DEFINITION Average TCH HR holding time

FORMULA B9 TRX

(MC380b) /TRX

(MC370b)

THRESHOLD Maintenance alert if mean duration for a single TS < 5 sec

COMMENT See comments above

REF NAME TCTRHMHT UNIT Second

INDICATOR RATIO OF HR TRAFFIC

DEFINITION Percentage of Half Rate traffic over a subsystem

FORMULA B9 TRX

(MC370b) /TRX

(MC370a + MC370b)

THRESHOLD

COMMENT This indicator is useful to get real usage of half rate for Half Rate MS.See comments above

REF NAME TCAHCAHO UNIT %


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INDICATOR TCH MULTIBAND OCCUPANCY

DEFINITION Total time occupancy of all RTCH channels allocated to multiband MS.

FORMULA B9 TRX

(MC381)

THRESHOLDCOMMENT A MS is considered as multiband if it supports:

- the P-GSM (or E-GSM or R-GSM) and the DCS1800 bands if thePLMN_FREQUENCY_BANDS parameter is set to "GSM900 and DCS1800 bands", or,

- the GSM850 and the DCS1800 bands if the PLMN_FREQUENCY_BANDS parameter is set to"GSM850 and DCS1800 bands", or,

- the GSM850 and the DCS1900 bands if the PLMN_FREQUENCY_BANDS parameter is set to"GSM850 and DCS1900 bands".Counter per TRX

REF NAME TCTRMT UNIT Second

INDICATOR TCH TIME SYSTEM CONGESTION

DEFINITION Cumulated time (in seconds) during which there is no free FR TCH sub-channel to serve an

incoming FR TCH request.

FORMULA B9 ts

(MC34)

THRESHOLD

COMMENT A TCH sub-channel is seen as busy:i) if the TCH sub-channel is occupied by a HR or FR CS call, orii) if the TCH sub-channel is allocated to the MFS to carry PS traffic.

REF NAME TCCGT UNIT Second

3.2.2.5 High-Load duration

INDICATOR BSC HIGH LOAD DURATION

DEFINITION Percentage of time during which the BSC is in high load situation in the cell.

FORMULA CELL

(MC924a) / GP

THRESHOLD > 5 %

COMMENT

REF NAME QRPALCGT UNIT %


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3.2.3 SCCP RESOURCE OCCUPANCY

INDICATOR SCCP CONNECTION ERLANG

DEFINITION SCCP connection Erlang over the BSC

FORMULA B9 ts

(MC400 / MC390) * ts

(MC01 + MC02 + MC10) + ts

(MC380a + MC380b)

observation duration in seconds

THRESHOLD > 80% SCCP capacity

COMMENT Sum on TS must be done for the whole BSC ; for SDCCH duration, only real MS access ontoSDCCH (C01, C02, C10) must be taken into account because the only ones leading to SCCP

connection openingSCCP Capacity = Erlang max. using Erlang B law with 0.1% blocking probability, over number ofSCCP connections available in the BSC :

256 SCCP connections available per SS7 links for BSC G2128 SCCP connections available per SS7 links for BSC G1

REF NAME QSTRSCE UNIT Erlang


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3.2.4 CONTROL CHANNELS (PCH, RACH, AGCH) TRAFFIC


CCCH Load

PCH Load

AGCH Load

RACH Load

Control Channels

Resource Load


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3.2.4.2 Resource load

INDICATOR RACH LOAD

DEFINITION Load on RACH logical channels

FORMULA B9 MC8C / (N1 * 3600 / 0.240)

THRESHOLD > 5% at cell nominal load(*) re-dimensioning of CCCH channel required (uncombined)

COMMENT Relevant for cell only

REF NAME CCRARQO UNIT %

INDICATOR AGCH LOAD

DEFINITION Load on AGCH logical channel(s) in case of fixed AGCH configuration

FORMULA B9 (MC8B + MC8D) / (N2 * 3600 / 0.240)

THRESHOLD > 60% at cell nominal load(*) re-dimensioning of CCCH channel required

COMMENT Relevant at cell level only, and not to be used if BS_AGBLK_RES = 0.Note that Immediate Assign Reject are taken into account.

REF NAME CCIARQO UNIT %

INDICATOR PCH LOAD

DEFINITION Load on PCH logical channel(s) in case of fixed AGCH configuration

FORMULA B9 (MC8A / N4) / ((N3 N2) * 3600 / 0.240)


COMMENT Relevant at cell level only, and not to be used if BS_AGBLK_RES = 0

REF NAME CCPGRQO UNIT %

INDICATOR

DEFINITION Load on CCCH-PAGCH channels in case of dynamic AGCH configurationFORMULA B9 ((MC8A / N4) + MC8B + MC8D) / (N3 * 3600 / 0.240)


COMMENT Relevant at cell level only, and to be used ONLY if BS_AGBLK_RES = 0

REF NAME CCCCRQO UNIT %


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Notes about Control channels load computation

Denominator for RACH, AGCH, PCH and PAGCH load

It is the maximum number of bursts (respectively RACH, AGCH, PCH and PAGCH=PCH+CCCH) that can be sent during

one hour on BCCH/CCCH multiframes, according to channel configuration, it is computed with following rules :- 3600 = 3600 seconds

- 0.240 = 235ms / 1000ms = one multiframe duration , 1/0.240 = number of multiframes in 1 second.

- N1, N2, N3 : number of bursts RACH, AGCH and PCH respectively in one CCCH multiframe :

- N1 = 27 if cell is configured in BCCH combined mode, N1 = 51 in uncombined mode- N2 = BS_AGBLK_RES as configured at OMC-R, typically 1 in combined BCCH mode, 4 in uncombined

BCCH mode.- N3 = 3 CCCH blocks in combined BCCH mode, 9 in uncombined BCCH mode- N4 = average number of mobile identity sent within one PAGING REQUEST (Type 3) message. Its value

depends on mobile identification mode in paging used over the network : by IMSI or TMSI. Typical values

are :N4 = 3 if Paging is performed using TMSIN4 = 1.5 if Paging is performed using IMSI

This parameter is configured at NSS level.

Cell nominal load = maximum traffic (TCH Erlang) that can be handled by the cell, using Erlang law B with default TCH

blocking rate (typically 2%).Application example with cell4 TRX, 30 TCH.

- Maximum traffic = 21 Erl (at 2% blocking rate)

- Actual Traffic (TCH) = 14 Erl

- Actual AGCH Load = 45%

- AGCH Load at cell nominal load = 45% *21 / 14 = 67.5%

=> re-dimensioning of CCCH is required


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3.3 GLOBAL QUALITY OF SERVICE INDICATORS

This set of indicators provides users with indicators corresponding to events that have an impact on final user'squality of service :

- definition of call drop rate, call establishment failure rate, ...- definition of the split of failures rate (BSS System, Radio, Congestion)

- definition of global Handover success/failure rates

3.3.1 SDCCH


SDCCH

Established

Phase

Drop Rate

Drop Radio Drop BSSDrop HOUnsuccess Rate

Congestion

Assignment Phase

/Handover Procedure

Radio

FailureBSS Failure

Access Reject


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3.3.1.2 Assignment phase

INDICATOR SDCCH ASSIGN UNSUCCESS RATE

DEFINITION Rate of SDCCH unsuccessful seizures during radio link establishment (congestion, radio accessproblem, BSS Problem)

FORMULA B9 cell

(MC04 + MC148 MC01 - MC02) / SDCCH ASSIGN REQUESTS

THRESHOLD >15%

COMMENT

REF NAME SDNAUR UNIT %

INDICATOR

(G)

SDCCH ASSIGN CONG FAIL RATE

DEFINITION Rate of SDCCH not allocated during radio link establishment due to congestion on Air interface.

FORMULA B9 cell

(MC04) / SDCCH ASSIGN REQUESTS

THRESHOLD >4%

COMMENT Check SDCCH Erlang : if not critical, SDCCH availability/allocation problem, or HO access on anearby cell side effect or interference on the carrier handling SDCCH (the last 2 can lead to highrate of phantom RACH )

REF NAME SDNACGR UNIT %

INDICATOR SDCCH ASSIGN ACCESS REJECT RATE

DEFINITION Rate of SDCCH channel requests rejected with IMMEDIATE ASSIGN REJECT MESSAGE.This occurs in congestion situation, in order to decrease number of SDCCH accesses.

FORMULA B9 cell

(MC8d) / SDCCH ASSIGN REQUESTS

THRESHOLD >4%

COMMENT This indicator should be compared to SDCCH ASSIGN CONGESTION to know mean number ofSDCCH requests rejected in this message.

REF NAME SDNARJR UNIT %

INDICATOR SDCCH ASSIGN ACCESS RF LOSSES RATE

DEFINITION Rate of SDCCH unsuccessful seizures during radio link establishment due to radio access problems

FORMULA B9 cell

(MC149) / SDCCH ASSIGN REQUESTS

THRESHOLD > 15% (high traffic period), > 30 % (low traffic period)

COMMENT Distinction between high and low traffic is included to avoid misunderstanding due to spurious

RACH.REF NAME SDNAFLRR UNIT %

INDICATOR SDCCH ASSIGN ACCESS FAIL BSS PB RATE

DEFINITION Rate of SDCCH unsuccessful seizures during radio link establishment procedure due to BSSProblems only

FORMULA B9 cell

(MC148 - MC149 - MC01 MC02) / SDCCH ASSIGN REQUESTS

THRESHOLD > 1%

COMMENT

REF NAME SDNAFLBR UNIT %


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3.3.1.3 Handover procedure

INDICATOR

(G)

SDCCH HO CONGESTION RATE

DEFINITION Rate of SDCCH not allocated due to congestion on Air interface during incoming intracell, internalintercell and external SDCCH handover.

FORMULA B9 cell

(MC81+MC91+MC101) / SDCCH HO REQUESTS

THRESHOLD > 2%

COMMENT

REF NAME SDHOCGR UNIT %

3.3.1.4 Established phase

INDICATOR

(G)

SDCCH DROP RATE

DEFINITION Rate of dropped SDCCH (SDCCH is established for any transaction OC, TC, LU,...)

FORMULA B9 cell

(MC138 + MC07 + MC137) / SDCCH ASSIGN SUCCESS

THRESHOLD >3%

COMMENT Drop radio + Drop HO + Drop BSS

REF NAME SDCDR UNIT %

INDICATOR SDCCH DROP RADIO RATE

DEFINITION Rate of dropped SDCCH due to radio link failures (Radiolink Time-out or Lapdm timer expiry)

FORMULA B9 cell (MC138) / SDCCH ASSIGN SUCCESS

THRESHOLD >2%

COMMENT

REF NAME SDCDRR UNIT %

INDICATOR SDCCH DROP BSS RATE

DEFINITION Rate of dropped SDCCH due to BSS problems

FORMULA B9 cell

(MC137) / SDCCH ASSIGN SUCCESS

THRESHOLD > 1%

COMMENT

REF NAME SDCDBR UNIT %

INDICATOR SDCCH DROP HO RATE

DEFINITION Rate of dropped SDCCH during outgoing internal intercell SDCCH HO procedure

FORMULA B9 cell

(MC07) / SDCCH ASSIGN SUCCESS

THRESHOLD > 1%

COMMENT

REF NAME SDCDHR UNIT %


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3.3.2 RTCH


RTCH

Unsuccess Rate

Assignment Phase

/

HandoverProcedure

Radio

Failure

Global Radio

Congestion Level

Congestion

BSS

Failure

Assignment

Established

Phase

Drop rate

Drop Radio

Drop BSS

Drop HO

Preempted

Calls

Preemption

Phase

PCI =1 PVI =1

Requests

Allocation

with / without

Preemption

Failure

Success

Success

Queuing

Phase

Queue Length

Assign

Queuing Fail

Assign

Queued andReject

Queued

Success

Queue Full

Higher

Priority

Timeout

Directed

Retry

Normal

Assign

Queued


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3.3.2.2 Assignment phase

INDICATOR

(G)

TCH ASSIGN UNSUCCESS RATE

DEFINITION Rate of unsuccessful RTCH seizures for normal assignment purpose ( preparation & executionfailures)

FORMULA B9 (TCH ASSIGN REQUESTS TCH ASSIGN SUCCESS) / TCH ASSIGN REQUESTS

THRESHOLD > 3%

COMMENT SEE Comments on TCH ASSIGN REQUESTS

REF NAME TCNAUR UNIT %

INDICATOR TCH ASSIGN FAIL CONG RATE

DEFINITION Rate of RTCH not allocated during normal assignment due to congestion on Air interface.

FORMULA B9 cell

(MC812) / TCH ASSIGN REQUESTS

THRESHOLD > 2%

COMMENT Check for availability and correct allocation of RTCHSEE Comments on TCH ASSIGN REQUESTS

REF NAME TCNACGR UNIT %

INDICATOR

(G)

GLOBAL RADIO CONGESTION LEVEL

DEFINITION Global radio congestion level : number or rate of cell recurrently congested

FORMULA B9 COUNT_OF_CELLS (AVERAGE (MAX (TCH ASSIGN FAIL CONG RATE)) > 2%))

THRESHOLD According to operator

COMMENT Th

Date post:	08-Aug-2018
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BSS_QoS_GSM_B9_Ed1

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