04_02_mn1736eu08mn_0001_appendix1_kpi

SIEMENS

Information

System PM: SBS Key Performance Indicators

(optional issue)

A30808-X3247-A912-1-7618

Please note: • This document is an optional customer documentation.

• It is not part of the official customer documentation.

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PM: SBS Key Performance Indicators Information

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Information PM: SBS Key Performance Indicators

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Trademarks: All designations used in this document can be trademarks, the use of which by third parties for their own purposes could violate the rights of their owners.

Copyright (C) Siemens AG 2001. Issued by the Information and Communication Networks Group Hofmannstraße 51 D-81359 München Technical modifications possible. Technical specifications and features are binding only insofar as they are specifically and expressly agreed upon in a written contract.


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Reason for Update

Summary: New release

Details:

Chapter/Section Reason for Update

All First version as optional customer documentation

Issue History Issue Number

Date of issue Date of issue

1 03/2002 First version for new release 6.0 Owner of document: O&M Systems Engineering Radio


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This document consists of a total of 108 pages. All pages are issue 1.

Contents

1 Introduction ...................................................................................................... 10

1.1 Purpose ....................................................................................................... 10

1.2 Reference Documents................................................................................. 10

1.3 Definition of Terms ...................................................................................... 11

2 Immediate Assignment Analysis ...................................................................... 14

2.1 Number of Immediate Assignment Attempts ............................................... 16

2.2 Number of Immediate Assignment Losses .................................................. 16

2.3 Number of AGCH Losses ............................................................................ 17

2.4 Number of Immediate Assignments without MS Seizure............................. 18

2.5 Number of successful Immediate Assignments ........................................... 18

2.6 Immediate Assignment Loss Rate ............................................................... 19

2.7 AGCH Loss Rate ......................................................................................... 19

2.8 Immediate Assignment without MS Seizure Rate........................................ 20

2.9 Immediate Assignment Success Rate ......................................................... 20

3 SSS Procedures Analysis ................................................................................ 21

3.1 Number of successful Immediate Assignments related to Call Setups........ 23

3.2 Number of Dropped SDCCH Connections related to Call Setups ............... 23

3.3 Number of SSS Procedure Failures related to Call Setups ......................... 24

3.4 Number of Assignment Attempts ................................................................. 24

3.5 SDCCH Drop Rate related to Call Setups ................................................... 25

3.6 SSS Procedures Failure Rate related to Call Setups .................................. 25

3.7 SSS Procedures Success Rate related to Call Setups................................ 26

4 Assignment Analysis ........................................................................................ 27

4.1 Number of Assignment Attempts ................................................................. 29

4.2 Number of Assignment Failures .................................................................. 29

4.3 Number of successful Assignments............................................................. 30

4.4 Assignment Failure Rate ............................................................................. 30

4.5 Assignment Success Rate........................................................................... 31

4.6 Successful Assignment probability during assignment procedure ............... 31

4.7 Mobile network access probability ............................................................... 32

5 Call Setup Analysis .......................................................................................... 33

5.1 Number of Call Setup Attempts ................................................................... 34

5.2 Number of Successful Call Setup Attempts................................................. 34

5.3 Call Setup Success Rate............................................................................. 35

5.4 Number of Call Setup Failures..................................................................... 35

5.5 Call Setup Failure Rate ............................................................................... 37

6 TCH Drop related Performance Indicators ....................................................... 39

6.1 Number of Dropped TCH Connections........................................................ 39


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6.2 TCH Drop Distribution..................................................................................40

6.3 TCH Drop Rate............................................................................................42

6.4 Call Drop Rate .............................................................................................42

6.5 Mean Time between TCH Drop ...................................................................43

6.6 TCH Drops per Erlanghour ..........................................................................43

7 SDCCH Drop related Performance Indicators..................................................44

7.1 Number of dropped SDCCH Connections ...................................................44

7.2 SDCCH Drop Rate ......................................................................................44

7.3 Mean Time between SDCCH Drop..............................................................45

7.4 SDCCH Drops per Erlanghour.....................................................................45

8 TCH Load related Performance Indicators .......................................................46

8.1 TCH Traffic Distribution Rate.......................................................................46

8.2 TCH Traffic Offered .....................................................................................47

8.3 TCH Traffic Carried......................................................................................48

8.4 TCH Traffic Lost ..........................................................................................49

8.5 TCH Blocking Rate ......................................................................................50

8.6 TCH Loss Rate ............................................................................................51

8.7 TCH Mean Holding Time .............................................................................52

8.8 TCH Traffic Utilisation..................................................................................53

8.9 TCH Erlang Blocking Rate...........................................................................54

9 SDCCH Load related Performance Indicators..................................................55

9.1 SDCCH Traffic Offered ................................................................................55

9.2 SDCCH Traffic Carried ................................................................................56

9.3 SDCCH Traffic Lost .....................................................................................57

9.4 SDCCH Blocking Rate.................................................................................57

9.5 SDCCH Loss Rate.......................................................................................58

9.6 SDCCH Mean Holding Time........................................................................58

9.7 SDCCH Traffic Utilisation ............................................................................59

9.8 SDCCH Erlang Blocking Rate .....................................................................59

10 Other Load related Performance Indicators....................................................60

10.1 PCH Accesses.............................................................................................60

10.2 RACH Accesses ..........................................................................................60

10.3 AGCH Accesses..........................................................................................60

10.4 PCH Rejection Rate.....................................................................................61

10.5 RACH Rejection Rate ..................................................................................61

10.6 AGCH Rejection Rate..................................................................................62

11 Handover related Performance Indicators ......................................................63

11.1 Intra Cell Handovers ....................................................................................63

11.1.1 HANDOVER SUCCESS RATE ......................................................................63

11.1.2 HANDOVER FAILURE RATE........................................................................ 64

11.1.3 HANDOVER DROP RATE............................................................................. 65

11.1.4 HANDOVER DISTRIBUTION......................................................................... 66


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11.1.5 SDCCH HANDOVER SUCCESS RATE ........................................................ 66

11.2 Inter Cell Intra BSC Handovers ................................................................... 67

11.2.1 HANDOVER SUCCESS RATE...................................................................... 67




11.2.5 INCOMING HANDOVER SUCCESS RATE................................................... 71


11.3 Inter Cell Inter BSC Handovers ................................................................... 72

11.3.1 HANDOVER SUCCESS RATE...................................................................... 72




11.3.5 INCOMING HANDOVER SUCCESS RATE................................................... 76


11.4 Other Handover Performance Indicators ..................................................... 77

11.4.1 HANDOVERS PER ERLANGHOUR.............................................................. 77

11.4.2 HANDOVERS PER CALL RATE................................................................... 77

11.4.3 SUCCESSFUL DIRECTED RETRIES ........................................................... 78

11.4.4 IMPERATIVE OUTGOING HANDOVER RATE............................................. 78

11.4.5 HANDOVER INDICATION REJECTION RATE............................................. 79

12 Power and Quality Measurements.................................................................. 80

12.1 Interference Band Rate on idle TCH............................................................ 80

12.2 Quality Link for N% FER.............................................................................. 80

12.3 Mean FER UpLink ....................................................................................... 81

12.4 Power and Quality limits for N% Percentile on busy TCH ........................... 82

12.5 Mean Level and Quality on busy TCH ......................................................... 83

12.6 TA Distribution ............................................................................................. 84

12.7 RXQUAL Distribution................................................................................... 84

12.8 RXLEV Distribution...................................................................................... 85

12.9 FER Distribution .......................................................................................... 85

12.10 Mean FER UpLink per RXQUAL ................................................................. 86

12.11 Mean RXLEV per RXQUAL Band................................................................ 87

12.12 Mean RXLEV per TA Band.......................................................................... 88

12.13 High RXLEV with Low RXQUAL Rate ......................................................... 89

12.14 TCH Traffic Type Distribution ...................................................................... 90

12.15 Adaptive Multirate Distribution ..................................................................... 91

13 Availability related Performance Indicators..................................................... 92

13.1 Tranceiver Availability.................................................................................. 92

13.2 TCH Distribution Rate.................................................................................. 92

13.3 TCH Efficency.............................................................................................. 93

13.4 SDCCH Efficency ........................................................................................ 94


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14 GPRS Related Performance Indicators ..........................................................95

14.1 Packet Data Access Successful Rate..........................................................95

14.2 Packet Access Rejections due to Congestion .............................................95

14.3 Mean number of PDCH dynamically configured ..........................................96

14.4 Mean User Data Throughput on Gb ............................................................97

14.5 Mean User Data Throughput on air interface...............................................98

14.6 Packet data rate on GB ...............................................................................99

14.7 Packet data rate on air interface..................................................................99

14.8 Mean Throughput per Configured PDCH................................................... 100

14.9 Retransmission Rate ................................................................................. 101

14.10 Number of Packet Pagings ........................................................................ 102

14.11 Mean number of active TBF per cell .......................................................... 102

14.12 Total number of established TBF per cell .................................................. 103

14.13 Access probability with no PDCH allocated ............................................... 103

15 Miscellaneous Performance Indicators......................................................... 104

15.1 BSC Processorload ................................................................................... 104

15.2 BTSE Processorload ................................................................................. 105

15.3 Paging / Location Update Ratio per Cell.................................................... 105

15.4 BSC -> MSC CCS7 Load .......................................................................... 106

16 BSS related KPIs at Siemens MSC .............................................................. 107

17 Appendix....................................................................................................... 108

17.1 List of BSS Performance Measurements................................................... 108


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1 Introduction

1.1 Purpose

The purpose of this document is the definitions of SBS Key Performance Indicators, which can be used in a uniform way. It is possible to compare Key Performance Indicators of different networks or to give statements about Quality, Performance, Capacity and more.

This document will describe the most important Key Performance Indicators relevant for GSM Mobile Networks. All listed formulas are valid for one elementary object and for one elementary measurement period. Evaluation of multiple objects and for multiple measurement periods can be done as described in chapter 1.4..

Due to the duration of this course it will just be possible to discuss just some the most important KPIs.

Reference Documents

You can find further information about Performance Measurement in the following documents :

• PM:SBS Counter (A30308-X3247-K40-*-7618)

• PM:SBS Message Flows (A30308-X3247-K41-*-7618)

• Training Documentation 1736 : BSS Performance Measurement

• Training Documentation 1835 : SSS Traffic Measurement

• GSM Recommendation 12.04 (V7.0.0 Release 99)

• Siemens Tabellenbuch Fernsprechtheorie (ISBN 3-8009-1343-7)


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1.2 Definition of Terms

Long name

This is the full name of the described key performance indicator (KPI).

Short name

This is an abbreviation of the described key performance indicator.

Description

The description will give you a short explanation of the described key performance indicator.

Formula

The formula will deliver the exact calculation of the described key performance indicator. The formula is related to one elementary object and to one elementary period. Multiple objects and multiple elementary periods can be added as described under ‘Evaluation of multiple objects for multiple elementary periods‘.

Used parameter

Here you can find either the SBS short identification of the used SBS performance measurement counters or the short name of the used key performance indicators. The related long names of SBS performance measurement counters you can find in the appendix under ‘List of Performance Measurements‘. The SBS short identification is a combination of measurement type and sub-counter. A measurement type can have several sub-counters. Therefore the used sub-counters are listed in brackets with following meaning:

• [1] sub-counter 1 has to be taken.

• [1,2,4] sub-counters 1, 2 and 4 have to be added.

• [1..4] sub-counters 1, 2, 3 and 4 have to be added.

• [1..4, 7..10] sub-counters 1, 2, 3, 4, 7, 8, 9 and 10 have to be added.

• [all] all sub-counters have to be added.

It is also possible that key performance indicators can have sub-indicators. In this case they are also listed in brackets.


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Elementary object

This is the smallest measurement object, which can be used for a KPI (e.g. BSC, Cell, TRX).

Unit

The unit is related to a key performance indicator e.g. seconds, percent or none.

Remark

Here you will find additional important information for the key performance indicator.

Aggregation

The aggregation field will show you how to evaluate the KPI for multiple objects and for multiple elementary periods. There are:

• Daily aggregation: for every KPI we can calculate:

- MAX/min value: the KPI value for the granularity period of one day is recorded. These values are processed to find the peak value, maximum (MAX) or the minimum value (min);

- MAX/min Time provides the starting time of the granularity period of the peak value (MAX and min);

- Mean/Sum daily value represents the mean/sum of the counter value, used in KPI’s formula, collected for the granularity period; it is the aggregation standard1 .

- SPBH (Sample at Peak Busy Hour2) is the value of the KPI at reference BH and is calculated only in the busy hour;

- SPBH Time provides the starting time of the hour of SPBH;

• Several days aggregation:

- MAX/MIN value: all the KPI values recorded for each granularity period for each day are processed to find the highest value (MAX) or the minimum value (min);

- MAX/MIN Time provides the starting time and date of the granularity period of the MAX/min value;

- TCMAX/TCMIN (Time Coherent MAX/min): for a number of days, counter values for each granularity period for each day are recorded. The values for the same granularity period for each day are averaged, determining the average day. The counter value in the granularity period in this average day give the highest value (TCMAX) or the lower value (TCmin) is taken;

- TCMAX/TCMIN Time provides the starting time related to TCMAX/TCmin value;

- Mean/Sum value: all the counter values, used in KPI’s formula, recorded for granularity periods for each day are processed to find the mean/sum value, it is the aggregation standard (refer to note 1);


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- ASPBH (Average Sample at Peak Busy Hour): each day the sample at peak busy hour is recorded and then these values are averaged;

- SPBH is the value of the KPI at reference BH and is calculated only in the busy hour on the number of considered days;

- SPBH Time and Date provides the starting time of the hour and the date of SPBH;

- TCSPBH (Time Coherent Sample at Peak Busy Hour): on average day it can be defined the busy hour, and in this peak busy hour the sample is recorded;

- TCSPBH Time (Time Coherent Sample at Peak Busy Hour Time): provides the starting time of the hour of TCSPBH;

- Mean daily represents the average over a number of days of the mean daily value;

- MAX_SPBH: each day the sample at peak busy is recorded and then the max of these values is considered.

For example it can be required to calculate the Handover Success Rate with SPBH aggregation Function referring to BSC Processor Load measurement:

- KPI(Aggregation Function[Reference variable])

- InterCellHOSuccRate(SPBH[BSCPRCLD[2]])

1Standard means that the evaluation can be done by adding or averaging the counter values for single objects and single periods in the following way (standard aggregation):

∑=t,i

t)(i,Counter m)(n,Counter t)(i,Counter m)(n,Counter =

i elementary object

t elementary period

n object (sum of elementary objects)

m measurement period (sum of elementary periods)

2The busy hour is the hour in which the reference variable assumes the highest value within one day for a measured object for any performance indicator. When the granularity period is smaller than 1 hour, this value is calculated with the sliding window algorithm.

Not in any case it makes sense to evaluate the busy hour for each single performance indicator. It is also possible to make an assumption, that for Random traffic the busy hour for most different measurement objects will correlate. That means the busy hour is derived from a particular performance indicator and can be used for other performance indicators. E.g. the busy hour could be derived from the performance indicator ‘BSC Processor load‘ and could than be used for all other performance indicators.


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2 Immediate Assignment Analysis

The KPIs of this section are mainly used for the derivation of the Call Setup Success Rate (CSSR) and Call Setup Failure Rate (CSFR). The Key Performance Indicators (KPIs) are mostly related to the Mobile Station point of view, by meaning they will count the events related to Mobile Stations. The messageflow of the Immediate Assignment Procedure is listed below. The numbers in brackets will indicate available SBS performance measurements.

Fig. 1 Message flow: Immediate Assignment Procedure

SBS Counter

[1] CHANNEL REQUIRED ATIMASCA [1..14]

[2] SDCCH CONGESTIONS (Congestions due to SDCCH HO are also counted)

ATSDCMBS [1]

[3] IMM. ASS CMD (Abis Interface) (IMM. ASS. CMD. messages, which contain an IMM. ASS. REJ. message are not counted)

SUIMASCA [1..6]

[4] IMM. ASS CMD (Abis Interface) (including those IMM. ASS. CMD. messages that contain an IMM. ASS. REJ. message)

TACCBPRO [2]

[5] IMM. ASS CMD / IMM. ASS. REJ. (Um Interface) (difference between IMM. ASS.CMD and Del. Ind., including those IMM. ASS. CMD. messages that contain an IMM. ASS. REJ. message)

NACSUCPR [2]

[6] ESTABLISH INDICATION NSUCCHPC [1..18]

BTS BSCMS

CHANNEL REQUEST

[1] CHANNEL REQUIRED

CHANNEL ACTIV

CHANNEL ACTIV ACK

CHANNEL ACTIV NEG.

[3] [4] [5] IMM. ASS CMD

[5] DELETE INDICATION

IMM. ASS CMD

IMM. ASS REJECT

SABM

[6] ESTABLISH INDIC. UA

[2] SDCCH CONGESTIONS


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The following figure shows you the traffic flow.

Fig. 2 Traffic flow: Immediate Assignment Procedure

This chapter contains the following ‘Number related’ KPIs:

• Number of Immediate Assignment Attempts = [1]

• Number of Immediate Assignment Losses = [2]

• Number of AGCH Losses = [4]

• Number of Immediate Assignments without MS Seizure = [6]

• Number of successful Immediate Assignments = [7] And the following ‘Rate related’ KPIs:

• Immediate Assignment Loss Rate = [2] / [1]

• AGCH Loss Rate = [4] / [3]

• Immediate Assignment without MS Seizure Rate = [6] / [5]

• Immediate Assignment Success Rate = [7] / [1] – [6] (Phantom RACHs are not counted, because they are not related to MS)

The Immediate Assignment Failure Rate can be calculated as follows:

Immediate Assignment Failure Rate = 1 - Immediate Assignment Success Rate or

Immediate Assignment Failure Rate = Immediate Assignment Loss Rate *

AGCH Loss Rate * Immediate Assignment without MS Seizure Rate

[2] Number of Immediate Assignment Losses

[4] Number of AGCH Losses

[6] Number of Immediate Assignments without MS Seizure

[7] Number of successful

Immediate Assignments

[1] Number of Immediate Assignment Attempts

[3]

[5]


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2.1 Number of Immediate Assignment Attempts

Long name: (a) Number of Immediate Assignment Attempts

Short name: (a) ImmAssAtt

Description: These indicators will give you the number of started Immediate Assignment procedures from MS point of view by counting the number of Channel Required messages.

Formula: (a) ..14]ATIMASCA[1ImmAssAtt =

Used param.: ATIMASCA[1..14]

Elem. Object: Cell

Unit: None

Remarks: Phantom RACHs are channel required messages not foreseen for the observed cell. The Immediate Assignment procedure to allocate an SDCCH/TCH is then started, but will not be successful, because no MS will reply with a SABM message and therefore a BTS Timer will expire. These unforeseen messages will also be counted.

2.2 Number of Immediate Assignment Losses

Long name: (a) Number of Immediate Assignment Losses

Short name: (a) ImmAssLoss

Description: These indicators will give you the number of SDCCH/TCH request, which were rejected, because no SDCCH/TCH was available or because of BTS channel activation failures.

Formula: (a) ..6]SUIMASCA[1 - ..14]ATIMASCA[1 ImmAssLoss =

Used param.: ATIMASCA[1..14], SUIMASCA[1..6]

Elem. Object: Cell

Unit: None



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2.3 Number of AGCH Losses

Long name: (a) Number of AGCH losses

Short name: (a) AGCHLoss

Description: These indicators will give you the number AGCH losses by meaning of not transmitted Immediate Assignment Command messages over the AGCH on the Air Interface. Reason for AGCH failures are mainly AGCH overload. This formula is related to MS point of view, by meaning each MS related immediate assignment procedure should be stepped once.

Therefore events, where no SDCCH/TCH was available or BTS channel activation failured are counted in the formula ‘Number of Immediate Assignment Losses’. => Only Delete Indication messages related to Immediate Assignment Command messages not containing an Immediate Assignment reject messages will rightly be counted.

Formula: (a)

]TACCBPRO[2

..6]SUIMASCA[1 * ])NACSUCPR[2 - ]TACCBPRO[2( AGCHLoss =

Used param.: TACCBPRO [2], NACSUCPR [2], SUIMASCA[1..6]

Elem. Object: Cell

Unit: None



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2.4 Number of Immediate Assignments without MS Seizure

Long name: (a) Number of Immediate Assignments without MS Seizure

Short name: (a) ImmAssNoSeiz

Description: These indicators will give you the number of immediate assignments without seizure by MS. The main reasons for this behaviour are Phantom RACHs, messages not foreseen for the observed cell. Other reasons are not received SABM messages due to air interface problems. This formula will count the difference between Immediate Assignment Command messages sent to the MS and the number of Establishment Indication messages. => not answered Immediate Assignment Commands.

Formula: (a) ..18]NSUCCHPC[1 - AGCHLoss - ..6]SUIMASCA[1 izImmAssNoSe =

Used param.: SUIMASCA[1..6], AGCHLoss (2.3a), NSUCCHPC [1..18]

Elem. Object: Cell

Unit: None

Remarks: The formula will mainly detect Phantom RACHs. Phantom RACHs are channel required messages not foreseen for the observed cell. The Immediate Assignment procedure to allocate an SDCCH/TCH is started, but will not be successful, because no MS will reply with a SABM message. A BTS Timer will expire.In case of RACH repetions (abnormal amount of time => Expiry of timer NSLOTST), it can happen that subsequent Immediate Assignment Commands will not receive a positive reply from the MS. Nevertheless from MS point of view the call setup was successful.

2.5 Number of successful Immediate Assignments

Long name: (a) Number of successful Immediate Assignments

Short name: (a) ImmAssSucc

Description: These indicators will give you the number of successful Immediate Assignments from MS point of view. A Immediate Assignment procedure is successful if the BTS returns an establishment indication message on Abis.

Formula: (a) ..18]NSUCCHPC[1 ssSuccImmA =

Used param.: NSUCCHPC[1..18]

Elem. Object: Cell

Unit: None

Remarks: None


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2.6 Immediate Assignment Loss Rate

Long name: (a) Immediate Assignment Loss Rate

Short name: (a) ImmAssLossRate

Description: These indicators will give you the SDCCH/TCH Loss Rate, which were rejected, because no SDCCH/TCH was available or because of BTS channel activation failures.

Formula: (a)

mAssAttIm

mAssLossIm RateImmAssLoss =

Used param.: ImmAssAtt (2.1a), ImmAssLoss (2.2a)

Elem. Object: Cell

Unit: None

Remarks: Phantom RACHs are channel required messages not foreseen for the observed cell. The Immediate Assignment procedure to allocate an SDCCH/TCH is then started, but will not be successful, because no MS will reply with a SABM message and therefore a BTS Timer will expire. These unforeseen messages will also be counted (in ImmAssAtt).

2.7 AGCH Loss Rate

Long name: (a) AGCH Loss Rate

Short name: (a) AGCHLossRate

Description: These indicators will give you the AGCH Loss Rate by meaning of not transmitted Immediate Assignment Command messages over the AGCH on the Air Interface. Reason for AGCH failures are mainly AGCH overload. This formula is related to MS point of view, by meaning each MS related immediate assignment procedure should be stepped once.

Therefore events, where no SDCCH/TCH was available or BTS channel activation failured are counted in the formula ‘Number of Immediate Assignment Losses’. => Only Delete Indication messages related to Immediate Assignment Command messages not containing an Immediate Assignment reject messages will rightly be considered.

Formula: (a)

mAssLossImmAssAttIm

AGCHLoss teAGCHLossRa

−

=

Used param.: ImmAssAtt (2.1a), ImmAssLoss (2.2a), AGCHLoss (2.3a)

Elem. Object: Cell

Unit: None



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2.8 Immediate Assignment without MS Seizure Rate

Long name: (a) Immediate Assignment without MS Seizure Rate

Short name: (a) ImmAssNoSeizRate

Description: These indicators will give you the immediate assignment without MS seizure rate . The main reasons for this behaviour are Phantom RACHs, messages not foreseen for the observed cell. Other reasons are not received SABM messages due to air interface problems. This formula will count number of not answered Immediate Assignment Command messages related to the Immediate Assignment Command messages sent to the MS.

Formula: (a)

AGCHLossmAssLossImmAssAttIm

izImmAssNoSe izRateImmAssNoSe

−−

=

Used param.: ImmAssAtt(2.1a), ImmAssLoss (2.2a), AGCHLoss (2.3a), ImmAssNoSeiz (2.4a)

Elem. Object: Cell

Unit: None

Remarks: The formula will mainly detect Phantom RACHs. Phantom RACHs are channel required messages not foreseen for the observed cell. The Immediate Assignment procedure to allocate an SDCCH/TCH is started, but will not be successful, because no MS will reply with a SABM message. A BTS Timer will expire.

2.9 Immediate Assignment Success Rate

Long name: (a) Immediate Assignment Success Rate

Short name: (a) ImmAssSuccRate

Description: These indicators will give you the immediate assignment success rate from MS point of view. A Immediate Assignment procedure is successful if the BTS returns an establishment indication message.

Formula: (a)

mAssNoSeizImmAssAttIm

ImmAssSucc RateImmAssSucc

−

=

Used param.: ImmAssAtt (2.1a), ImmAssSucc (2.5a), ImmAssNoSeiz (2.4a)

Elem. Object: Cell

Unit: None

Remarks: Phantom RACHs are not included in this formula, because they are not related to MS of the observed cell. Not received SABM messages due to air interface problems will lead to small systematic errors.


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3 SSS Procedures Analysis

The KPIs of this section are mainly used for the derivation of the Call Setup Success Rate (CSSR) and Call Setup Failure Rate (CSFR). The Key Performance Indicators (KPIs) are mostly related to the Mobile Station point of view, by meaning they will count the events related to Mobile Stations. There exists the following SSS Procedures which used during Call Setup related to the parameter setting in the MSC: Identity Check (IMEI), Authentication (IMSI), Ciphering, Call Control: Setup

Fig. 3 Message flow: SSS Procedures during Call Setup (MOC)

SBS Counter

[1] ESTABLISH INDICATION NSUCCHPC[1..4, 7..10, 13..16]

[2] ASSIGNMENT ATTEMPTS TASSATT [2..3]

Sub-counters are listed in Brackets

The different number of failures and failure rates can be evaluated with Siemens MSC counter per MSC. All events are cell independent. Therefore it is sufficient to calculate them for the elementary object MSC.

It is also very important to evaluate the number of SDCCH drops during call setup. SDCCH drops mainly occur in the time when SSS Procedures are running. Therefore they can be evaluated together with the SSS Procedure formulas. With SBS performance measurement counter it is possible to calculate the SSS Procedure Success and Failure Rate related to Call Setups.

BTS BSCMS

SABM [1] Establishment

CCAuthentification Request

Authentification Response

Ciphering Complete

Ciphering Command

MSC

CR(Compl Layer3Info)

Identity Request

Identity Response

I(Ciphering Command)

I(Ciphering Complete)

Setup

[2] Assignment Request I(Assignment Command)


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Fig. 4 Traffic flow: SSS Procedures during Call Setup

SDCCH Drops can occure before SSS Procedure Failure and vice versa. This chapter contains the following ‘Number related’ KPIs:

• Number of successful Immediate Assignments related to Call Setups = [1]

• Number of Dropped SDCCH Connections related to Call Setups = [2]

• Number of SSS Procedure Failures related to Call Setups = [3]

• Number of Assignment Attempts = [4] And the following ‘Rate related’ KPIs:

• SDCCH Drop Rate related to Call Setups = [2] / [1]

• SSS Procedures Failure Rate related to Call Setups = [3] / [1]

• SSS Procedures Success Rate related to Call Setups = [4] / [1]

The SSS Procedures Failure Rate can be calculated as follows:

SSS Procedures Failure Rate = 1 - SSS Procedures Success Rate or

SSS Procedures Failure Rate = SDCCH Drop Rate related to Call Setups +

Number of SSS Procedure Failures related to Call Setups

[2]SDCCH Drops [3] SSS Procedure failures

[4] Assignment Attempts

[1]Successful Immediate Assignments


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3.1 Number of successful Immediate Assignments related to Call Setups

Long name: (a) Number of successful Immediate Assignments related to Call Setups

Short name: (a) ImmAssSuccCS

Description: These indicators will give you the number of successful Immediate Assignments related to Call Setups. A Immediate Assignment procedure related to a Call Setup is successful if the BTS returns an establishment indication message related to Mobile Originated Calls (MOC), Mobile Terminated Calls (MTC), Emergency Calls or Call Reestablishment.

Formula: (a) 13..16] 7..10, ..4,NSUCCHPC[1 ssSuccCSImmA =

Used param.: NSUCCHPC[1..4, 7..10, 13..16]

Elem. Object: Cell

Unit: None

Remarks: SMS-MT (MTC-> answer to paging) are also counted in this formula due to the fact that the PAGING RESPONSE is included in the ESTABILSHMENT INDICATION Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to systematic errors.

3.2 Number of Dropped SDCCH Connections related to Call Setups

Long name: (a) Number of Dropped SDCCH Connections related to Call Setups

Short name: (a) SDCCHDropCS

Description: This indicator will give you the number of dropped SDCCH connections related to Call Setups. SDCCH drops mainly occur during running SSS Procedures. This formula is related to the assumption that the number of dropped SDCCH connections is random distributed to all kind of assignment causes (MOC, MTC, Locupd, …). Therefore this formula contains an factor for the ratio of MOC and MTC to all kind of assignment causes to get the relation to Call Setups.

Formula: (a)

..18]NSUCCHPC[1

13..16] 7..10, ..4,NSUCCHPC[1 * ..8]NRFLSDCC[1 SSDCCHDropC =

Used param.: NRFLSDCC[1..8], NSUCCHPC[1..18]

Elem. Object: Cell

Unit: None

Remarks: SDCCH Handovers are not considered here. SMS-MT (MTC-> answer to paging) are also counted in this formula due to the fact that the PAGING RESPONSE is included in the Establishment Indication Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to small systematic errors.


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3.3 Number of SSS Procedure Failures related to Call Setups

Long name: (a) Number of SSS Procedure Failures related to Call Setups

Short name: (a) SSSProcFailCS

Description: This indicator will give you the number of SSS Procedure failures related to Call Setups.

Formula: (a) SSDCCHDropC -AssAtt - CSImmAssSucc lCSSSSProcFai =

Used param.: ImmAssSuccCS (3.1a), AssAtt (3.4a), SDCCHDropCS (3.2a)

Elem. Object: Cell

Unit: None

Remarks: Please note that Authentication-, Identity-, Ciphering- and MSC failures are also counted in this formula although they are not related to the BSS. User Release before assignment of a TCH is also included in this formula. Assignments of SDCCH are not considered. SMS-MT (MTC-> answer to paging) are also counted in this formula due to the fact that the PAGING RESPONSE is included in the Establishment Indication Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to systematic errors.

3.4 Number of Assignment Attempts

Long name: (a) Number of Assignment Attempts

Short name: (a) AssAtt

Description: These indicators will give you the number of started Assignment procedures for allocation of a traffic channel. Assignment Attempts are always related to Call Setups (MOC, MTC, Emergency, Reestablishment).

Formula: (a) 3]TASSATT[2, AssAtt =

Used param.: TASSATT[2,3]

Elem. Object: Cell

Unit: None

Remarks: Assignments of SDCCH are not considered.


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3.5 SDCCH Drop Rate related to Call Setups

Long name: (a) SDCCH Drop Rate related to Call Setups

Short name: (a) SDCCHDropRateCS

Description: This indicator will give you the SDCCH Drop Rate related to Call Setups. SDCCH drops mainly occur during running SSS Procedures. This formula is related to the assumption that the number of dropped SDCCH connections is random distributed to all kind of assignment causes (MOC, MTC, Locupd, …). Therefore this formula is equal to the SDCCH Drop Rate.

Formula: (a) ateSDCCHDropR

mAssSuccCSIm

SSDCCHDropC ateCSSDCCHDropR ==

Used param.: SDCCHDropCS (3.2a), ImmAssSuccCS (3.1a), SDCCHDropRate (7.2a)

Elem. Object: Cell

Unit: None

Remarks: SDCCH Handovers are not considered here. SMS-MT (MTC-> answer to paging) are also counted in this formula due to the fact that the PAGING RESPONSE is included in the Establishment Indication Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to small systematic errors.

3.6 SSS Procedures Failure Rate related to Call Setups

Long name: (a) SSS Procedures Failure Rate related to Call Setups

Short name: (a) SSSProcFailRateCS

Description: This indicator will give you the SSS Procedures Failure Rate by meaning the number of failures during SSS Procedures compared to the number of successful Immediate Assignment Procedures (Establishment Indication).

Formula: (a)

mAssSuccCSIm

ocFailCSPrSSS lRateCSSSSProcFai =

Used param.: SSSProcFailCS (3.3a), ImmAssSuccCS (3.1a)

Elem. Object: Cell

Unit: None

Remarks: Please note that Authentification-, Identity-, Ciphering- and MSC failures are also counted in this formula although they are not related to the BSS. User Release before assignment of a TCH is also included in this formula. Assignments of SDCCH are not considered. SMS-MT (MTC-> answer to paging) are also counted in this formula due to the fact that the PAGING RESPONSE is included in the Establishment INDICATION Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to systematic errors.


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3.7 SSS Procedures Success Rate related to Call Setups

Long name: (a) SSS Procedures Success Rate related to Call Setups

(b) Total SSS Procedures Success Rate related to Call Setups

Short name: (a) SSSProcSuccRateCS

(b) SSSProcSuccRateCStotal

Description: The first Indicator will give you the SSS Procedures Success Rate related to Call Setups by meaning the rate for successful allocated Timeslots from MSC point of view (Assignment Request Message) minus the SDCCH Drop Rate related to Call Setups. This indicator is related to the Radio Network and is therefore recommended to find out Radio Network failures.

The second indicator will give you the SSS Procedures Success Rate related to Call Setups by meaning the number of started Assignment Procedures (Assignment Requests) compared to the number of successful Immediate Assignment Procedures (Establishment Indications) related to Call Setups. Authentication-, Identity-, Ciphering- and MSC failures are also counted within this indicator although they are not related to the BSS.

Formula: (a) ateCSSDCCHDropR - 1 cRateCSSSSProcSuc =

(b) CSSuccImmAss

AssAtt alcRateCStotSSSProcSuc = or

CSocFailRatePrSSSateCSSDCCHDropR1 alcRateCStotSSSProcSuc −−=

Used param.: SuccImmAssCS (3.1a), AssAtt (3.4a), SDCCHDropRateCS (3.5a), SSSProcFailRateCS (3.6a)

Elem. Object: Cell

Unit: None

Remarks: Please note that Authentication-, Identity-, Ciphering- and MSC failures will lead to a worse Success Rate although they are not related to the BSS. User Release before assignment of a TCH is also included in the second formula. Assignments of SDCCH are not considered. SMS-MT (MTC-> answer to paging) are also counted in these formulas due to the fact that the PAGING RESPONSE is included in the Establishment Indication Message and does not allow any distinction between MTC and SMS-MT. This behaviour can lead to systematic errors. (very small for formula (a)).


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4 Assignment Analysis

The KPIs of this section are mainly used for the derivation of the Call Setup Success Rate (CSSR) and Call Setup Failure Rate (CSFR). The Key Performance Indicators (KPIs) are mostly related to the Mobile Station point of view, by meaning they will count the events related to Mobile Stations. The messageflow of the Assignment Procedure is listed below (normal case). The numbers in brackets will indicate available SBS performance measurements.

Fig. 5 Message flow: Assignment Procedure (normal case)

BSS Counter

[1] ASSIGMENT ATTEMPS TASSATT [2..3]

[2] INCOMING REDIRECTED TASSSUCC [4..5]

[3] OUTGOING REDIRECTED CALLS SINTHINT [7] + SUINBHDO [7*n]

[4] ASSIGMENT COMPLETE (normal Assignm.) TASSSUCC [2..3]

[5] ASSIGMENT FAILURE TASSFAIL [1,3,5,6,8,10,11,13,15]

[6] Queuing Failure NMSGDISQ [1,2]

Subcounters are listed in Brackets; [3] all targetcells have to be considered

MS BTS BSC MSC

ASSIGNMENT REQUEST

CHAN ACTIV

ASSIGNMENT COMMAND

CHAN ACTIV ACK

SABM

CHANNEL ACTIV NEG ACK

ASSIGNMENT COMMAND

ASSIGNMENT FAILURE

ASSIGNMENT COMPLETE

[5] TASSFAIL

UA

ASSIGNMENT COMPLETE

ESTABLISH INDICATION

(TNTCHCL)

ASSIGNMENT COMPLETE

[1] TASSATT

[4] TASSSUCC

PHYS CONTEXT REQ

PHYS CONTEXT CONF

(MTCHBUTI)


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Fig. 6 Traffic flow: Assignment Procedure

The Assignment procedure is used to allocate a TCH. Because of new feature the Assignment Success Rate is not easy to evaluate. The Directed Retries have also to be considered. The concept how to evaluate Directed Retries for the Assignment Success Rate is comparable with the Handover Success Rate, where only outgoing Handover will be considered. Therefore all Directed Retries for an observed cell have to be counted, which where started in the observed cell and were successful in any target cell with neighbourcell measurements.

Under this assumption the Assignment Success Rate can be evaluated as follows:

Assignment Success Rate = (Assignment Complete [4] + Successful outgoing redirected Calls [3]) / Assignment Attempts [1]


• Number of Assignment Attempts

• Number of Assignment Failures

• Number of successful Assignments This chapter contains the following ‘Rate related’ KPIs:

• Assignment Failure Rate

• Assignment Success Rate

Single Cell / Observed Cell

[1] Assigment Attemps

[4] Assigment Complete

[3] Sucessful Outgoing redirected Calls

[2] Successful incoming

redirected Calls

[5] Assigment Failure

[6] Queing Failure


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4.1 Number of Assignment Attempts

Long name: (a) Number of Assignment Attempts

Short name: (a) AssAtt

Description: These indicators will give you the number of started Assignment procedures.

Formula: (a) 3]TASSATT[2, AssAtt =

Used param.: TASSATT[2,3]

Elem. Object: Cell

Unit: None


4.2 Number of Assignment Failures

Long name: (a) Number of TCH Losses

(b) Number of Assignment Failures by Message

(c) Number of Assignment Failures due to other Reason

(d) Number of Queuing Failures

Short name: (a) TCHLoss

(b) AssFailbyMess

(c) AssFailOther

(d) QueFail

Description: These indicators will give you the number of failed Assigments of a TCH.

Formula: (a) ,13]TASSFAIL[8 TCHLoss =

(b) 2,15],7,10,11,1TASSFAIL[6 essAssFailbyM =

(c) QueFail-essAssFailbyM -TCHLoss - SuccAss -AssAtt er AssFailOth =

(d) ,2]NMSGDISQ[1 QueFail =

Used param.: TASSFAIL[6..15], AssAtt (4.1a) , AssSucc (4.3a)

Elem. Object: Cell

Unit: None

Remarks: Assignments of SDCCH are not considered. Subcounters TASSFAIL[10] and TASSFAIL[15] ('All

other causes') used in formula (b) includes the A-interface and equipment related causes (see GSM

08.08). Formula (c) AssFailOther contains all other causes related to internal and transmission

failures.


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4.3 Number of successful Assignments

Long name: (a) Number of successful Assignments

Short name: (a) AssSucc

Description: These indicators will give you the number of successful completed Assignment procedures. Successful completed Assignment procedures are incremented even with successful outgoing directed retry, because it represents an assignment of TCH for the originating cell.

Formula: (a) 224],14,21,..,SUINBHDO[7 ]SINTHINT[7 ,3]TASSSUCC[2 AssSucc ++=

Used param.: TASSSUCC[2,3], SINTHINT[7], SUINBHDO[7,14,21,..,224]

Elem. Object: Cell

Unit: None


4.4 Assignment Failure Rate

Long name: (a) TCH Loss Rate

(b) Assignment Failure Rate by Message

(c) Assignment Failure Rate due to other Reason

(d) Queuing Failure Rate

Short name: (a) TCHLossRate

(b) AssFailbyMessRate

(c) AssFailOtherRate

(d) QueFailRate

Description: These indicators will give you the Assignment Failure Rates. The Assignment procedure is unsuccessful if the BSC returns a Assignment Failure message to the MSC or if the directed retry in the target cell was not successful.

Formula: (a)

AssAtt

TCHLoss eTCHLossRat =

(b) AssAtt

essAssFailbyM essRateAssFailbyM =

(c) AssAtt

erAssFailOth erRateAssFailOth =

(d) AssAtt

QueFail eQueFailRat =

Used param.: AssAtt(4.1a), TCHLoss (4.2a), AssFailbyMess (4.2b), AssFailOther (4.2c), QueFail (4.2d)

Elem. Object: Cell

Unit: None



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4.5 Assignment Success Rate

Long name: (a) Assignment Success Rate

Short name: (a) AssSuccRate

Description: These indicators will give you the Assignment Success Rate. The Assignment procedure is successful if the BSC returns an Assignment Complete message to the MSC or if the directed retry in the target cell was successful.

Formula: (a)

AssAtt

AssSucc eAssSuccRat =

Used param.: AssAtt (4.1a), AssSucc (4.3a)

Elem. Object: Cell

Unit: None


4.6 Successful Assignment probability during assignment procedure

Long name: (a) Successful Assignment probability during assignment procedure

Short name: (a) SuccAssProb

Description: This indicator represents the probability that an assignment procedure doesn’t fail because of radio interface or terrestrial causes. Successful “Directed Retry” procedures outgoing from the observed cell are counted as successful assignment too.

Formula: (a)

TCHLoss-AssAtt

essAssFailbyM -TCHLoss-AssAttobPruccAssS =

Used param.: AssAtt (4.1a), TCHLoss (4.2a), AssFailbyMess (4.2b)

Elem. Object: Cell

Unit None

Remarks: None


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4.7 Mobile network access probability

Long name: (a) TCH no blocking probability on user side

(b) SDCCH no blocking probability

(c) Successful signalling procedures rate

(d) Mobile network access probability

Short name: (a) TchNoBlock

(b) SDCCHNoBlock

(c) SuccSigProcRate

(d) NetAccProb

Description: This indicator provides an estimate of the success probability of a network access attempt. It takes into account the signalling phases of the access from the request made on RACH to the successful TCH allocation (if required) both on the radio and the terrestrial interface up to MSC. No information are available on MSC capability to connect with success a PLMN subscriber to a PSTN exchange. Problems arising from congestion toward PSTN are not visible.

Formula: (a) ( )eTCHLossRat1CHNoBlockT −=

(b) ( )ateSDCCHLossR1kDCCHNoBlocS −=

(c) ( )ateSDCCHDropr1ocRatePruccSigS −=

(d) obPrSuccAssTCHNoBlockcRateSuccSigProkDCCHNoBlocSobPretAccN ⋅⋅⋅=

Used param.: TCHLossRate(4.4a), SDCCHLossRate(9.5a), SDCCHDropRate(3.5a), SuccAssProb(4.6a)

Elem. Object: Cell

Unit None

Remarks: None


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5 Call Setup Analysis

The KPIs of the previous sections are mainly used for the derivation of the Call Setup Success Rate (CSSR) and Call Setup Failure Rate (CSFR). The Call Setup Success Rate and Call Setup Failure Rate are related to the Mobile Station point of view, by meaning they will count the events related to Mobile Stations.

Overview Call Setup Analysis

CS

(5.3a) CSSR

(5.3b) CSSR BSS

(5.3c) CSSR SSS

(5.5) CSFR

(5.5a) Call Setup Failure Rate

(5.5b) Call Setup Failure Rate due to Immediate Assignment Losses

(5.5c) Call Setup Failure Rate due to AGCH Loss

(5.5d) Call Setup Failure Rate due to Immediate Assignment without MS Seizure

(5.5e) Call Setup Failure Rate due to SDCCH Drops

(5.5f) Call Setup Failure Rate due to SSS Procedure Failure

(5.5g) Call Setup Failure Rate due to TCH Loss

(5.5h) Call Setup Failure Rate due to Assignment Failures by Message

(5.5i) Call Setup Failure Rate due to Assignment Failures with other Reasons

(5.5j) Call Setup Failure Rate due to Queuing Failures

Comparable Overview can also be done for the ‘Number Related KPIs’


• Number of Call Setup Attempts

• Number of Successful Call Setup Attempts

• Number of Call Setup Failures And the following ‘Rate related’ KPIs:

• Call Setup Success Rate

• Call Setup Failure Rate


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5.1 Number of Call Setup Attempts

Long name: (a) Number of Call Setup Attempts

Short name: (a) CSAtt

Description: This indicator counts all attempts at the BSS to setup up an end to end connection.

Formula: (a)

Rate)ImmAssLoss-(1 * te)AGCHLossRa-(1 * izRate)ImmAssNoSe - (1

CSSuccImmAss CSAtt =

Used param.: SuccImmAssCS (3.1a), ImmAssLossRate (2.6a), AGCHLossRate (2.7a), ImmAssNoSeizRate (2.8a)

Elem. Object: Cell

Unit: None

Remarks: Phantom RACHs are channel required messages not foreseen for the observed cell. The Immediate Assignment procedure to allocate an SDCCH/TCH is then started, but will not be successful, because no MS will reply with a SABM message and therefore a BTS Timer will expire. These unforeseen messages will also be counted. The Immediate Assignment failures are independent to the different call types (MOC, MTC, Locupd, SMS, ...). Therefore the Immediate Assignment Failure Rates for any call type are used in the above formula.

5.2 Number of Successful Call Setup Attempts

Long name: (a) Number of Successful Call Setup Attempts

Short name: (a) CSSucc

Description: This indicator counts all successful Call Setup Attempts at the BSS to setup up an end to end connection. A Call Setup Attempt was successful if the MS was able to seize a TCH.

Formula: (a) AssSucc CSSucc =

Used param.: AssSucc (4.3a)

Elem. Object: Cell

Unit: None

Remarks: Assignment of SDCCH are not considered


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5.3 Call Setup Success Rate

Long name: (a) Call Setup Success Rate

(b) Call Setup Success Rate BSS

(c) Call Setup Success Rate SSS

Short name: (a) CSSuccRate

(b) CSSuccRateBSS

(c) CSSuccRateSSS

Description: This indicator will give you the Call Setup Success Rate at the BSS to setup up an end to end connection. Three indicators are available, one that takes into account all Call Setup Failures (BSS and SSS), one that only takes into account BSS related Call Setup Failures and one that only takes into account SSS related Call Setup Failures.

Formula: (a) eAssSuccRat * alcRateCStotSSSProcSuc * RateImmAssSucc CSSuccRate =

(b) eAssSuccRat * RateImmAssSucc BSSCSSuccRate =

(~ 1 - SDCCHDropCS)

(c) alcRateCStotSSSProcSuc SSSCSSuccRate =

Used param.: ImmAssSuccRate (2.9a), SSSProcSuccRateCStotal (3.7a), AssSuccRate (4.5a)

Elem. Object: Cell

Unit: None

Remarks: Systematic errors can occur as described in the used KPIs.

5.4 Number of Call Setup Failures

Long name: (a) Number of Call Setup Failures

(b) Number of Call Setup Failures due to Immediate Assignment Losses

(c) Number of Call Setup Failures due to AGCH Loss

(d) Number of Call Setup Failures due to Immediate Assignment without MS Seizure

(e) Number of Call Setup Failures due to SDCCH Drops

(f) Number of Call Setup Failures due to SSS Procedure Failure

(g) Number of Call Setup Failures due to TCH Loss

(h) Number of Call Setup Failures due to Assignment Failures by Message

(i) Number of Call Setup Failures due to Assignment Failures with other Reasons

(j) Number of Call Setup Failures due to Queuing Failures

Short name: (a) CSFail

(b) CSFailImmAssLoss

(c) CSFailAGCHLoss

(d) CSFailImmAssNoSeiz


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(e) CSFailSDCCHDrop

(f) CSFailSSSProcFail

(g) CSFailTCHLoss

(h) CSFailAssFailbyMess

(i) CSFailAssFailOther

(j) CSFailQueFail

Description: These indicators will give you the number of unsuccessful Call Setups. Different indicators distinguish between different causes used in the different procedures (Immediate Assignment, SSS Procedures and Assignment).

Formula: (a) CSFail = CSAtt - CSSucc

(b) CSFailImmAssLoss = CSAtt * ImmAssLossRate

(c) CSFailAGCHLoss = CSAtt * AGCHLossRate

(d) CSFailImmAssNoSeiz = CSAtt * ImmAssNoSeizRate

(e) CSFailSDCCHDrop = CSAtt * ImmAssSuccRate * SDCCHDropRateCS

(f) CSFailSSSProcFail = CSAtt * ImmAssSuccRate * SSSProcFailRateCS

(g) CSFailTCHLoss = TCHLoss

(h) CSFailAssFailbyMess = AssFailbyMess

(i) CSFailAssFailOther = AssFailOther

(j) CSFailQueFail = QueFail

Used param.: CSAtt (5.1a), CSSucc (5.2a), ImmAssLossRate(2.6a), AGCHLossRate(2.7a), ImmAssNoSeizRate(2.8a), ImmAssSuccRate (2.9a), SDCCHDropRateCS(3.5a), SSSProcFailRateCS(3.6a), TCHLoss(4.2a), AssFailbyMess(4.2b), AssFailOther(4.2c), QueFail(4.2d)

Elem. Object: Cell

Unit: None

Remarks: Can be found for the different causes in the above chapters.


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5.5 Call Setup Failure Rate

Long name: (a) Call Setup Failure Rate

(b) Call Setup Failure Rate due to Immediate Assignment Losses

(c) Call Setup Failure Rate due to AGCH Loss

(d) Call Setup Failure Rate due to Immediate Assignment without MS Seizure

(e) Call Setup Failure Rate due to SDCCH Drops

(f) Call Setup Failure Rate due to SSS Procedure Failure

(g) Call Setup Failure Rate due to TCH Loss

(h) Call Setup Failure Rate due to Assignment Failures by Message

(i) Call Setup Failure Rate due to Assignment Failures with other Reasons

(j) Call Setup Failure Rate due to Queuing Failures

Short name: (a) CSFailRate

(b) CSFailRateImmAssLoss

(c) CSFailRateAGCHLoss

(d) CSFailRateImmAssNoSeiz

(e) CSFailRateSDCCHDrops

(f) CSFailRateSSSProcFail

(g) CSFailRateTCHLoss

(h) CSFailRateAssFailbyMess

(i) CSFailRateAssFailOther

(j) CSFailRateQueFail

Description: These indicators will give you the Call Setup Failure Rate. Different indicators distinguish between different causes used in the different procedures (Immediate Assignment, SSS Procedures and Assignment).

Formula: (a) CSFailRate = 1 – CSSuccRate

(b) CSFailRateImmAssLoss = ImmAssLossRate

(c) CSFailRateAGCHLoss = AGCHLossRate

(d) CSFailRateImmAssNoSeiz = ImmAssNoSeizRate

(e) CSFailRateSDCCHDrops = SDCCHDropRateCS

(f) CSFailRateSSSProcFail = SSSProcFailRateCS

(g) CSFailRateTCHLoss = TCHLossRate

(h) CSFailRateAssFailbyMess = AssFailbyMessRate

(i) CSFailRateAssFailOther = AssFailOtherRate

(j) CSFailRateQueFail = QueFailRate

Used param.: CSSuccRate (5.3a), ImmAssLossRate(2.6a), AGCHLossRate(2.7a), ImmAssNoSeizRate(2.8a), SDCCHDropRateCS(3.5a), SSSProcFailRateCS(3.6a), TCHLossRate(4.4a), AssFailbyMessRate(4.4b), AssFailOtherRate(4.4c), QueFailRate(4.4d)


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Elem. Object: Cell

Unit: None

Remarks: Can be found for the different causes in the above chapters.


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6 TCH Drop related Performance Indicators

6.1 Number of Dropped TCH Connections

Long name: (a) Number of Dropped TCH Connections

(b) Number of dropped TCH Handovers

Short name: (a) TCHDrop

(b) TCHDropHO

Description: This indicator will give you the number of dropped TCH connections related to Mobile Stations.

Formula: (a) TCHDropHO 34,35]26,28..32,19..23,25,.14,16,17,.5,7,8,10.NRFLTCH[1. TCHDrop +=

(b) DropInterBSCHO]UNIHIRLC[11] UNIHIALC[

DropInterBSCHO ODropInterCellH ODropIntraCellH TCHDropHO

++=

++=

Used param.: NRFLTCH[1..5, 7,8,10..14, 16,17,19..23, 25,26,28..32, 34,35], UNIHIALC[1], UNIHIRLC[1], InterBSCHODrop(11.3.3a)

Elem. Object: Cell

Unit: None

Remarks: Subcounter ‘Handover Access failures’ (NRFLTCH[6,15,24,33] ) and counter ‘unspecified cause’ (NRFLTCH[9,18,27,36] ) will not be counted within NRFLTCH, because they are related to Handovers and will be counted within the Handover Drops (DropTCHHO). Please note that there can be systematic errors caused by timer settings. If the feature SDCCH Handover is activated, then this will lead to a systematic error.


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6.2 TCH Drop Distribution

Long name: (a) TCH drop distribution due to expiry of timer T200

(b) TCH drop distribution due to unsolicited DM response

(c) TCH drop distribution due to sequence error

(d) TCH drop distribution due to expiry of timer T_MSRFPCI

(e) TCH drop distribution due to distance limit exceeded

(f) TCH drop distribution due to handover access failures

(g) TCH drop distribution due to radio link failures

(h) TCH drop distribution due to remote transcoder failures

(i) TCH drop distribution due to other connection failures

(j) TCH drop distribution due to intra cell handovers

(k) TCH drop distribution due to inter cell intra bsc handovers

(l) TCH drop distribution due to inter bsc handovers

Short name: (a) TCHDropDist.T200

(b) TCHDropDist.UnsolDMRes

(c) TCHDropDist.SeqErr

(d) TCHDropDist.TMSRFPCI

(e) TCHDropDist.Distance

(f) TCHDropDist.HOAccess

(g) TCHDropDist.RadLinkFail

(h) TCHDropDist.RemTranscFail

(i) TCHDropDist.Others

(j) TCHDropDist.IntraCellHO

(k) TCHDropDist.InterCellHO

(l) TCHDropDist.InterBSCHO

Description: This indicator will give you the TCH Drop Distribution showing a particular TCH drops related to the total number of drops related to Mobile Stations.

Formula: (a)

TCHDrop

10,19,28]NRFLTCH[1, t.T200TCHDropDis =

(b) TCHDrop

11,20,29]NRFLTCH[2, est.UnsolDMRTCHDropDis =

(c) TCHDrop

12,21,30]NRFLTCH[3, t.SeqErrTCHDropDis =

(d) TCHDrop

13,22,31]NRFLTCH[4, t.TMSRFPCITCHDropDis =


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A30808-X3247-A912-1-7618 41

(e) TCHDrop

14,23,32]NRFLTCH[5, t.DistanceTCHDropDis =

(f) TCHDrop

15,24,33]NRFLTCH[6, t.HOAccessTCHDropDis =

(g) TCHDrop

16,25,34]NRFLTCH[7, ailt.RadLinkFTCHDropDis =

(h) TCHDrop

17,26,35]NRFLTCH[8, cFailt.RemTransTCHDropDis =

(i) TCHDrop

18,27,36]NRFLTCH[9, t.OthersTCHDropDis =

(j) TCHDrop

]UNIHIALC[1 lHOt.IntraCelTCHDropDis =

(k) TCHDrop

]UNIHIRLC[1 lHOt.InterCelTCHDropDis =

(l) TCHDrop

DropInterBSCHO HOt.InterBSCTCHDropDis =

Used param.: NRFLTCH[1..36], UNIHIALC[1], UNIHIRLC[1], InterBSCHODrop(11.3.3a), TCHDrop(6.1a)

Elem. Object: Cell

Unit: None

Remarks: Handover Access failures are included in formulas TCHDropDist.HOAccess and TCHDropDist.InterBSCHO. If the feature SDCCH Handover is activated, then this will lead to a systematic error.


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42 A30808-X3247-A912-1-7618

6.3 TCH Drop Rate

Long name: (a) TCH Drop Rate

Short name: (a) TCHDropRate

Description: This indicator will give you the rate of all losses of connections during a call (TCH Connection) or during a handover in relation to the number of TCH Seizures.

Formula: (a)

..2]SUCTCHSE[1

TCHDrop eTCHDropRat =

Used param.: TCHDrop(6.1a), SUCTCHSE[1..2]

Elem. Object: Cell

Unit: None

Remarks: Please note that there can be systematic errors caused by timer settings (Ny,

T3105, TTrau, TSync, T_MSRFPCI, T8). If the feature SDCCH Handover is activated, then this will lead to a systematic error. This KPI is not only related to Call Setups. It is related to any TCH seizure (e.g. Handovers). Therefore for network optimisation it is recommended to use KPI ‘TCH Drops per Erlanghour ‘, because increasing number of Handovers (e.g. Ping Pong Handovers) will decrease the TCH Drop Rate.

6.4 Call Drop Rate

Long name: (a) Call Drop Rate

Short name: (a) CallDropRate

Description: This indicator will give you the losses of TCH connection during a call in relation to the number of successful Call Setups.

Formula: (a)

SuccInterBSCHO-OSuccInterCellH-OSuccIntraCellH-..2]SUCTCHSE[1

TCHDrop teCallDropRa =

Used param.: TCHDrop(6.1a), SUCTCHSEI[1..2] , IntraCellHOSucc(11.1.1a) , InterCellHOSucc(11.2.1a) , InterBSCHOSucc(11.3.1b)

Elem. Object: Cell

Unit: None

Remarks: Please note that there can be systematic errors caused by timer settings (Ny,

T3105, TTrau, TSync, T_MSRFPCI, T8). If the feature SDCCH Handover is activated, then this will lead to a systematic error. This KPI is only related to Call Setups. It doesn`t make sense to use it for a single cell because this can lead to results greater than 100%. Therefore for network optimisation it is recommended to use KPI ‘TCH Drops per Erlanghour ‘.


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A30808-X3247-A912-1-7618 43

6.5 Mean Time between TCH Drop

Long name: (a) Mean Time between TCH Drop

Short name: (a) MTBTCHDrop

Description: This indicator will give you mean time between TCH Drop, by meaning the time in seconds until the occurence of the loss of a TCH connection.

Formula: (a)

TCHDrop

60s *y Granularit* rDRTCHTrafCar MTBTCHDrop =

Used param.: TCHDrop(6.1a), TCHTrafCarrDR(8.3c), Granularity in minutes

Elem. Object: Cell

Unit: Seconds

Remarks: SDCCH Handovers are not considered and can therefore lead to systematic errors.

6.6 TCH Drops per Erlanghour

Long name: (a) TCH Drops per Erlanghour

Short name: (a) TCHDropErlh

Description: This indicator will give you TCH Drops per Erlanghour., by meaning the number of losses of TCH connections related to one Erlanghour.

Formula: (a)

yGranularit

60*

rDRTCHTrafCar

TCHDrop hTCHDropErl =

Used param.: TCHDrop(6.1a), TCHTrafCarrDR(8.3c), Granularity in minutes

Elem. Object: Cell

Unit: None

Remarks: SDCCH Handovers are not considered and can therefore lead to systematic errors.


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44 A30808-X3247-A912-1-7618

7 SDCCH Drop related Performance Indicators

7.1 Number of dropped SDCCH Connections

Long name: (a) Number of dropped SDCCH Connections

Short name: (a) SDCCHDrop

Description: This indicator will give you the number of dropped SDCCH Connections, which can occur for any call type (MOC, MTC, Locupd, SMS, ...).

Formula: (a) ..9]NRFLSDCC[1 SDCCHDrop =

Used param.: NRFLSDCC[1..9]

Elem. Object: Cell

Unit: None

Remarks: MSC controlled SDCCH Handover drops are also counted (Expiry of Timer T8). BSC controlled SDCCH Handover drops are not counted and will lead to small systematic errors.

7.2 SDCCH Drop Rate

Long name: (a) SDCCH Drop Rate

Short name: (a) SDCCHDropRate

Description: This indicator will give you the rate all losses of connections during a SDCCH Connection.

Formula: (a)

..6]NSUCCHPC[1

SDCCHDrop ateSDCCHDropR =

Used param.: SDCCHDrop(7.1a), NSUCCHPC[1..6]

Elem. Object: Cell

Unit: None

Remarks: MSC controlled SDCCH Handover drops are also counted (Expiry of Timer T8). BSC controlled SDCCH Handover drops are not counted and will lead to small systematic errors.


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7.3 Mean Time between SDCCH Drop

Long name: (a) Mean Time between SDCCH Drop

Short name: (a) MTBSDCCHDrop

Description: This indicator will give you mean time between SDCCH Drop, by meaning the time in seconds until the occurence of the loss of a SDCCH connection.

Formula: (a)

SDCCHDrop

60s *y Granularit* arrDRSDCCHTrafC opMTBSDCCHDr =

Used param.: SDCCHDrop(7.1a), SDCCHTrafCarr(9.2a) , Granularity in minutes

Elem. Object: Cell

Unit: Seconds

Remarks: SDCCH Handovers Drops are not considered.

7.4 SDCCH Drops per Erlanghour

Long name: (a) SDCCH Drops per Erlanghour

Short name: (a) SDCCHDropErlh

Description: This indicator will give you SDCCH Drops per Erlanghour., by meaning the number of losses of SDCCH connections related to one Erlang.

Formula: (a)

yGranularut

60*

arrSDCCHTrafC

SDCCHDrop rlhSDCCHDropE =

Used param.: SDCCHDrop(7.1a), SDCCHTrafCarr(9.2a) , Granularity in minutes

Elem. Object: Cell

Unit: None

Remarks: SDCCH Handovers Drops are not considered.


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46 A30808-X3247-A912-1-7618

8 TCH Load related Performance Indicators

The following figure will give you an overview about the load related performance indicators used in the traffic theory.

Fig. 7 Overview Load related performance indicators

For the estimation of the Load of GSM Telecom Systems the Erlang B formula for non queing Telefon Systems and the Erlang C formula for Queuing Telefon Systems can be used. Further information about the traffic theory can be found in the ‘Siemens Tabellenbuch Fernsprechtheorie ISBN 3-8009-1343-7’.

8.1 TCH Traffic Distribution Rate

Long name: (a) TCH Full Rate Traffic

(b) TCH Half Rate Traffic

Short name: (a) FRT

(b) HRT

Description: This indicator will give you the Rate of Full Rate and Half Rate traffic on TCH compared to the total traffic.

Formula: (a)

[1..4] MEBUSTCH

3] [1, MEBUSTCH FRT =

(b) [1..4] MEBUSTCH

4] [2, MEBUSTCH HRT =

Used param.: MEBUSTCH[1..4]

Elem. Object: Cell

Unit: None

Remarks: This KPI can be used by network planning to calculate the number of needed TRX.

Number of

channels N

Traffic Offered A [Erl]

Call Attempts CA

Traffic Carried Y [Erl]

Calls Carried CC

Traffic Lost [Erl]

Calls Rejected CR

Loss B


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A30808-X3247-A912-1-7618 47

8.2 TCH Traffic Offered

Long name: (a) TCH Traffic Offered Full Rate

(b) TCH Traffic Offered Half Rate

(c) TCH Traffic Offered Dual Rate

Short name: (a) TCHTrafOffFR

(b) TCHTrafOffHR

(c) TCHTrafOffDR

Description: This indicator will give you the amount of traffic in Erlang on TCH the MS subscribers wanted to have due to the traffic theorie.

Formula: (a)

eFRTCHLossRat-1

3] [1, MEBUSTCH FRTCHTrafOff =

(b) eHRTCHLossRat-1

4] [2, MEBUSTCH HRTCHTrafOff =

(c) HRTCHTrafOffFRTCHTrafOff DRTCHTrafOff +=

Used param.: MEBUSTCH[1..4] , TCHLossRateFR(8.6a), TCHLossRateHR(8.6b)

Elem. Object: Cell

Unit: Erlang

Remarks: None


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48 A30808-X3247-A912-1-7618

8.3 TCH Traffic Carried

Long name: (a) TCH Traffic Carried Full Rate

(b) TCH Traffic Carried Half Rate

(c) TCH Traffic Carried Dual Rate

Short name: (a) TCHTrafCarrFR

(b) TCHTrafCarrHR

(c) TCHTrafCarrDR

Description: This indicator will give you the amount of carried traffic in Erlang on TCH.

Formula: (a) 3] [1, MEBUSTCH rFRTCHTrafCar =

(b) 4] [2, MEBUSTCH rHRTCHTrafCar =

(c) rHRTCHTrafCarrFRTCHTrafCar rDRTCHTrafCar +=

Used param.: MEBUSTCH[1..4]

Elem. Object: Cell

Unit: Erlang

Remarks: None


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A30808-X3247-A912-1-7618 49

8.4 TCH Traffic Lost

Long name: (a) TCH Traffic Lost Full Rate

(b) TCH Traffic Lost Half Rate

(c) TCH Traffic Lost Dual Rate

(d) TCH Traffic Lost Waiting System Full Rate

(e) TCH Traffic Lost Waiting System Half Rate

(f) TCH Traffic Lost Waiting System Dual Rate

Short name: (a) TCHTrafLostFR

(b) TCHTrafLostHR

(c) TCHTrafLostDR

(d) TCHTrafLostWSFR

(e) TCHTrafLostWSHR

(f) TCHTrafLostWSDR

Description: This indicator will give you the the amount of traffic in Erlang on TCH which were lost. Performance Indicators for waiting systems are also provided and will consider only the messages discarded from the TCH queue.

Formula: (a) rFRTCHTrafCar - FRTCHTrafOff tFRTCHTrafLos =

(b) rHRTCHTrafCar - HRTCHTrafOff tHRTCHTrafLos =

(c) rDRTCHTrafCar - DRTCHTrafOff tDRTCHTrafLos =

(d) 3],NMSGDISQ[1 tWSFRTCHTrafLos =

(e) ,4]NMSGDISQ[2 tWSHRTCHTrafLos =

(f) ..4]NMSGDISQ[1 tWSDRTCHTrafLos =

Used param.: TCHTrafOffFR(8.2a), TCHTrafOffHR(8.2b), TCHTrafOffDR(8.2c),

TCHTrafCarrFR(8.3a), TCHTrafCarrHR(8.3b), TCHTrafCarrDR(8.3c)

NMSGDISQ[1..4]

Elem. Object: Cell

Unit: Erlang

Remarks: None


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50 A30808-X3247-A912-1-7618

8.5 TCH Blocking Rate

Long name: (a) TCH Blocking Rate Full Rate

(b) TCH Blocking Rate Half Rate

(c) TCH Blocking Rate Dual Rate

Short name: (a) TCHBlockRateFR

(b) TCHBlockRateHR

(c) TCHBlockRateDR

Description: This indicator will give you the TCH Blocking Rate by meaning the rate were all traffic channels were occupied.

Formula: (a)

60s *y Granularit

]AALTCHTI[1 teFRTCHBlockRa =

(b) 60s *y Granularit

]AALTCHTI[4 teHRTCHBlockRa =

(c) HRT* teHRTCHBlockRaFRT * teFRTCHBlockRa teDRTCHBlockRa +=

Used param.: AALTCHTI[1..2], FRT(8.1a), HRT(8.1b), Granularity in Minutes

Elem. Object: Cell

Unit: None

Remarks: For Dual Rate Channels (formula c) the Full Rate and Half Rate channels must be weighted with the TCH Traffic distribution Rate. Due to feature ‘Smooth Channel Modification’ the measurement type AALTCHTI keeps track of the number of timeslots belonging to the TCH_Pool, TCH/SD_Pool and SDCCH_Backup Pool.


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A30808-X3247-A912-1-7618 51

8.6 TCH Loss Rate

Long name: (a) TCH Loss Rate Full Rate

(b) TCH Loss Rate Half Rate

(c) TCH Loss Rate Dual Rate

(d) TCH Loss Rate Waiting System Full Rate

(e) TCH Loss Rate Waiting System Half Rate

(f) TCH Loss Rate Waiting System Dual Rate

Short name: (a) TCHLossRateFR

(b) TCHLossRateHR

(c) TCHLossRateDR

(d) TCHLossRateWSFR

(e) TCHLossRateWSHR

(f) TCHLossRateWSDR

Description: This indicator will give you the TCH Traffic Loss Rate by meaning the rate were new TCH Seizure Attempts could not be handled by the observed cell, because all traffic channels were occupied / blocked. The seizure attempt might have been successful in another cell through directed retry.

Performance Indicators for waiting systems are also provided and will consider only the messages discarded from the TCH queue.

Formula: (a)

[1] ATTCHSEI

3] [1, ATCHSMBS eFRTCHLossRat =

(b) [2] ATTCHSEI

4] [2, ATCHSMBS eHRTCHLossRat =

(c) HRT* eHRTCHLossRatFRT * eFRTCHLossRat eDRTCHLossRat +=

(d) [1] ATTCHSEI

3] [1, NMSGDISQ eWSFRTCHLossRat =

(e) [2] ATTCHSEI

[2,4] NMSGDISQ eWSHRTCHLossRat =

(f) [1..2] ATTCHSEI

[1..4] NMSGDISQ eWSDRTCHLossRat =

Used param.: ATCHSMBS[1..4], ATTCHSEI[1..2], NMSGDISQ[1..4], FRT (8.1a), HRT (8.1b)

Elem. Object: Cell

Unit: None

Remarks: Queuing is not considered here. For Dual Rate Channels (formula c) the Full Rate and Half Rate channels must be weighted with the TCH Traffic distribution Rate. Please note, after expiry of Timer THORQST an intercell or intracell handover will be re-attempted and counter ATCHSMBS can be pegged again, if no resource is still available..


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8.7 TCH Mean Holding Time

Long name: (a) TCH Mean Holding Time Full Rate

(b) TCH Mean Holding Time Half Rate

(c) TCH Mean Holding Time Dual Rate

Short name: (a) TCHMHTFR

(b) TCHMHTHR

(c) TCHMHTDR

Description: This indicator will give you the mean holding Time in seconds for occupied TCHs in a cell.

Formula: (a)

3] [1, TNTCHCL

60 *y Granularit * ,3]MEBUSTCH[1 TCHMHTFR =

(b) 4] [2, TNTCHCL

60 *y Granularit * ,4]MEBUSTCH[2 TCHMHTHR =

(c) [1..4] TNTCHCL

60 *y Granularit * ..4]MEBUSTCH[1 TCHMHTDR =

Used param.: MEBUSTCH[1..4], TNTCHCL[1..4], Granularity in minutes

Elem. Object: Cell

Unit: Seconds

Remarks: A weighting with the TCH Traffic distribution Rate is not necessary here, because Erlang values are used.


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8.8 TCH Traffic Utilisation

Long name: (a) TCH Traffic Utilisation Full Rate

(b) TCH Traffic Utilisation Half Rate

(c) TCH Traffic Utilisation Dual Rate

Short name: (a) TCHTrafUtilFR

(b) TCHTrafUtilHR

(c) TCHTrafUtilDR

Description: This indicator will give you the TCH Traffic Utilisation Rate by meaning of the carried traffic devided through the Erlang B function.

Formula: (a)

A

,3]MEBUSTCH[1 lFRTCHTrafUti =

Erlang B formula: B) [2,8],f(NRDEFTCH B)f(N, A ==

Erlang C formula:

])MDURTCRQ[1],MTCHQLEN[1 B, [2,8],f(NRDEFTCH )Q,QB,f(N, A dl ==

(b) A

,4]MEBUSTCH[2 lHRTCHTrafUti =

Erlang B formula:

B) [5,11],f(NRDEFTCH B)f(N, A ==

Erlang C formula

])MDURTCRQ[2],MTCHQLEN[2 B, [5,11],f(NRDEFTCH )Q,QB,f(N, A dl ==

(c) A

..4]MEBUSTCH[1 lDRTCHTrafUti =

Erlang B formula:

B) ,[2,5,8,11]f(NRDEFTCH B)f(N, A ==

Erlang C formula: ,2])MDURTCRQ[1,2],MTCHQLEN[1 B, ,[2,5,8,11]f(NRDEFTCH )Q,QB,f(N, A dl ==

with A = Offered Load in Erlang B = Blocking Probability (Planning Parameter)

Used param.: MEBUSTCH[1..4], NRDEFTCH [2,5,8,11], MTCHQLEN[1,2], MDURTCRQ[1,2]

Elem. Object: Cell

Unit: None

Remarks: If Queuing is activated, Erlang C instead of Erlang B fomula has to be taken. A weighting with the TCH Traffic distribution Rate is not necessary here, because Erlang values are used.


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54 A30808-X3247-A912-1-7618

8.9 TCH Erlang Blocking Rate

Long name: (a) TCH Erlang Blocking Rate Full Rate

(b) TCH Erlang Blocking Rate Half Rate

(c) TCH Erlang Blocking Rate Dual Rate

Short name: (a) TCHErlBlockRateFR

(b) TCHErlBlockRateHR

(c) TCHErlBlockRateDR

Description: This indicator provides the blocking probability estimated using ErlangB / ErlangC.

Formula: (a) B kRateFRTCHErlBloc =

Erlang B formula:

TCHEffFR)arrFR,f(TCHtrafC N)f(Y, B ==

Erlang C formula: ])MDURTCRQ[1 ],MTCHQLEN[1TCHEffFR,arrFR,f(TCHtrafC )Q,QN,f(Y, B dl ==

(b) B kRateHRTCHErlBloc =

Erlang B formula:

TCHEfflHR)arrHR,f(TCHtrafC N)f(Y, B ==

Erlang C formula:

])MDURTCRQ[2 ],MTCHQLEN[2TCHEffHR,arrHR,f(TCHtrafC )Q,QN,f(Y, B dl=

(c) B kRateDRTCHErlBloc =

Erlang B formula: TCHEffDR)arrDR,f(TCHtrafC N)f(Y, B ==

Erlang C formula: ,2])MDURTCRQ[1 ,2],MTCHQLEN[1TCHEffDR,arrDR,f(TCHtrafC )Q,QN,f(Y, B dl=

Used param.: TCHTrafCarrFR(7.3a), TCHEffFR(13.3a), TCHEffHR(13.3b), TCHEffDR(13.3c), MTCHQLEN[1,2], MDURTCRQ[1,2]

Elem. Object: Cell

Unit Erlang

Remarks: Please note that these formulas depends on the MS capability (DR or FR only). E.g. MS with MS capability FR only are not able to seize a HR channel. Therefore the results must be valuated accordingly.


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9 SDCCH Load related Performance

Indicators

The following figure will give you an overview about the load related performance indicators used in the traffic theory.

Fig. 8 Overview Load related performance indicators

For the estimation of the Load of GSM Telecom Systems the Erlang B formula can be used. Further information about the traffic theory you can find in the ‘Siemens Tabellenbuch Fernsprechtheorie ISBN 3-8009-1343-7’.

9.1 SDCCH Traffic Offered

Long name: (a) SDCCH Traffic Offered

Short name: (a) SDCCH TrafOff

Description: This indicator will give you the amount of traffic in Erlang on SDCCH the MS subscribers wanted to have due to the traffic theorie.

Formula: (a)

ateSDCCHLossR-1

[1] MBUSYSDC ffSDCCHTrafO =

Used param.: MBUSYSDC[1], SDCCHLossRate(9.5a)

Elem. Object: Cell

Unit: Erlang

Remarks: None

Number of

channels N

Traffic Offered A [Erl]

Call Attempts CA

Traffic Carried Y [Erl]

Calls Carried CC

Traffic Lost [Erl]

Calls Rejected CR

Loss B


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56 A30808-X3247-A912-1-7618

9.2 SDCCH Traffic Carried

Long name: (a) SDCCH Traffic Carried

Short name: (a) SDCCH TrafCarr

Description: This indicator will give you the amount of carried traffic in Erlang on SDCCH.

Formula: (a) [1] MBUSYSDC arr SDCCHTrafC =

Used param.: MBUSYSDC[1]

Elem. Object: Cell

Unit: Erlang

Remarks: None


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A30808-X3247-A912-1-7618 57

9.3 SDCCH Traffic Lost

Long name: (a) SDCCH Traffic Lost

Short name: (a) SDCCHTrafLost

Description: This indicator will give you the the amount of traffic in Erlang on SDCCH which were lost (e.g. Blockings).

Formula: (a) arrSDCCHTrafC - ffSDCCHTrafO ost SDCCHTrafL =

Used param.: SDCCHTrafOff(9.1a), SDCCHTrafCarr(9.2a)

Elem. Object: Cell

Unit: Erlang

Remarks: None

9.4 SDCCH Blocking Rate

Long name: (a) SDCCH Blocking Rate

Short name: (a) SDCCHBlockRate

Description: This indicator will give you the SDCCH Blocking Rate by meaning the rate where all SDCCH were occupied.

Formula: (a)

60s *y Granularit

[1] ASDCALTI RateSDCCHBlock =

Used param.: ASDCALTI[1], Granularity in minutes

Elem. Object: Cell

Unit: None

Remarks: Due to feature ‘Smooth Channel Modification’ the measurement type ASDCALTI keeps track of the number of timeslots belonging to the SDCCH_Pool and SDCCH_Backup_Pool and TCH/SD_Pool.


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58 A30808-X3247-A912-1-7618

9.5 SDCCH Loss Rate

Long name: (a) SDCCH Loss Rate

Short name: (a) SDCCHLossRate

Description: This indicator will give you the SDCCH Traffic Loss Rate by meaning the rate where new SDCCH Seizure Attempts could not be handled, because all SDCCH were occupied / blocked.

Formula: (a)

[1] NATTSDPE

[1] ATSDCMBS ateSDCCHLossR =

Used param.: ATSDCMBS[1], NATTSDPE[1]

Elem. Object: Cell

Unit: None

Remarks: None

9.6 SDCCH Mean Holding Time

Long name: (a) SDCCH Mean Holding Time

Short name: (a) SDCCHMHT

Description: This indicator will give you the mean holding Time in seconds for occupied SDCCH in a cell.

Formula: (a)

..6]NSUCCHPC[1

60s *y Granularit * [1] MBUSYSDC SDCCHMHT =

Used param.: MBUSYSDC[1], NSUCHPC[1..6], Granularity in minutes

Elem. Object: Cell

Unit: seconds

Remarks: None


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A30808-X3247-A912-1-7618 59

9.7 SDCCH Traffic Utilisation

Long name: (a) SDCCH Traffic Utilisation

Short name: (a) SDCCHTrafUtil

Description: This indicator will give you the SDCCH Traffic Utilisation by meaning of the carried traffic devided through the number of availabe SDCCH.

Formula: (a)

A

]MBUSYSDC[1 tilSDCCHTrafU =

Erlang B formula:

B) H[2],f(NRDESDCCB)f(N, A ==

with A = Offered Load in Erlang B = Blocking Probability (Planning Parameter)

Used param.: MBUSYSDC[1], NRDESDCCH[2]

Elem. Object: Cell

Unit: None

Remarks: None

9.8 SDCCH Erlang Blocking Rate

Long name: (a) SDCCH Erlang Blocking Rate

Short name: (a) SDCCHErlBlockRate

Description: This indicator provides the blocking probability estimated using ErlangB formula.

Formula: (a) B ockRateSDCCHErlBl =

Erlang B formula

SDCCHEff)fCarr,f(SDCCHTra )N,Y(f B ==

Used param.: SDCCHTrafCarr(9.2a), SDCCHEff(13.4a).

Elem. Object: Cell

Unit None

Remarks: None


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60 A30808-X3247-A912-1-7618

10 Other Load related Performance Indicators

10.1 PCH Accesses

Long name: (a) Number of Paging Channel Accesses

Short name: (a) PCHAcc

Description: This indicator will give you number of transmitted paging messages at the air interface (PCH).

Formula: (a) PCHAcc = NTDPMAIN[1]

Used param.: NTDPMAIN[1]

Elem. Object: Cell

Unit: None

Remarks: None

10.2 RACH Accesses

Long name: (a) Number of RACH Accesses

Short name: (a) RACHAcc

Description: This indicator will give you number of successful detected RACH (Random Access Channel) messages on the air interface.

Formula: (a) RACHAcc = NACSUCPR[3]

Used param.: NACSUCPR[3]

Elem. Object: Cell

Unit: None

Remarks: None

10.3 AGCH Accesses

Long name: (a) Number of AGCH Accesses

Short name: (a) AGCHAcc

Description: This indicator will give you number of sent AGCH (Access Grant Channel) messages on the air interface.

Formula: AGCHAcc = NACSUCPR [2]

Used param.: NACSUCPR [2]

Elem. Object: Cell

Unit: None

Remarks: None


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10.4 PCH Rejection Rate

Long name: (a) PCH Rejection Rate

Short name: (a) PCHRejRate

Description: This indicator will give you the PCH Rejection rate by meaning the number of discarded paging messages discarded from the paging queue divided by the number of PCH (Paging Channel) Accesses.

Formula:

(a) ]TACCBPRO[1

]NTDPMAIN[2PCHRejRate =

Used param.: NTDPMAIN[2], TACCBPRO[1]

Elem. Object: Cell

Unit: None

Remarks: None

10.5 RACH Rejection Rate

Long name: (a) RACH Rejection Rate

Short name: (a) RACHRejRate

Description: This indicator will give you the RACH Rejection rate by meaning the number of invalid RACH messages received on the RACH (Random Access Channel) divided by the number of RACH Accesses.

Formula:

(a) ]3[NACSUCPR..3]NINVRACH[1

..3]NINVRACH[1eRACHRejRat

+

=

Used param.: NINVRACH [1..3], NACSUCPR[3]

Elem. Object: Cell

Unit: None

Remarks: None


System

62 A30808-X3247-A912-1-7618

10.6 AGCH Rejection Rate

Long name: (a) AGCH Rejection Rate

Short name: (a) AGCHRejRate

Description: This indicator will give you the AGCH Rejection rate by meaning the number of discarded AGCH messages on the AGCH (Access Grant Channel) divided by the number of AGCH Accesses.

Formula:

(a) ]2[TACCBPRO

]NACSUCPR[2]2[TACCBPROeAGCHRejRat

−

=

Used param.: TACCBPRO[2], NACSUCPR[2]

Elem. Object: Cell

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 63

11 Handover related Performance Indicators

11.1 Intra Cell Handovers

11.1.1 Handover Success Rate

Long name: (a) Number of Intra Cell Handover Attempts

(b) Number of Intra Cell Handover Successs

(c) Intra Cell Handover Success Rate

(d) Intra Cell Handover Success Rate per cause

Short name: (a) IntraCellHOAtt

(b) IntraCellHOSucc

(c) IntraCellHOSuccRate

(d) IntraCellHOSuccRateC[c]

Description: These indicators will give you the number and rate of successful Intra Cell Handovers. Several indicators distinguish between different causes.

Formula: (a) ..12]ATINHIAC[1 OAtt IntraCellH =

(b) ..12]SINTHITA[1 OSuccIntraCellH =

(c) OAttIntraCellH

OSuccIntraCellH OSuccRateIntraCellH =

(d) ]ATINHIAC[c

]SINTHITA[c [c]OSuccRateCIntraCellH =

with c=1 for uplink quality with c=2 for downlink quality with c=3 for inner to complete area with c=4 for complete to inner area with c=5 for near to far area with c=6 for far to near area with c=7 for forced handover due to O&M with c=8 for TCH/F to TCH/H due to AMR with c=9 for TCH/H to TCH/F due to AMR with c=10 for forced intracell handover due to enhanced pairing with c=11 for forced intracell handover due to preferred TRX with c=12 for forced HO due to Multislot calls

Used param.: SINTHITA[1..12], ATINHIAC[1..12]

Elem. Object: Cell

Unit: None

Remarks: SDCCH handovers are also incremented in this formulas.


System

64 A30808-X3247-A912-1-7618

11.1.2 Handover Failure Rate

Long name: (a) Number of Intra Cell Handover Failures

(b) Intra Cell Handover Failure Rate

(c) Intra Cell Handover Failure Rate per Cause

Short name: (a) IntraCellHOFail

(b) IntraCellHOFailRate

(c) IntraCellHOFailRateC[c]

Description: These indicators will give you the number and rate of Intra Cell Handover Failures by meaning of unsuccessful Handovers without loss of MS connection because of reversion to old cell. Several indicators distinguish between different causes.

Formula: (a) 1..12] UNINHOIA[ OFailIntraCellH =

(b) OAttIntraCellH

OFailIntraCellH OFailRateIntraCellH =

(c) ]ATINHIAC[c

]UNINHOIA[c [c]OFailRateCIntraCellH =


Used param.: UNINHOIA[1..12], , ATINHIAC[1..12], IntraCellHOAtt (11.1.1a)

Elem. Object: Cell

Unit: None



System

A30808-X3247-A912-1-7618 65

11.1.3 Handover Drop Rate

Long name: (a) Number of Intra Cell Handover Drops

(b) Intra Cell Handover Drop Rate

(c) Intra Cell Handover Drop Rate per Cause

Short name: (a) IntraCellHODrop

(b) IntraCellHODropRate

(c) IntraCellHODropRateC[c]

Description: These indicators will give you the number and rate of Intra Cell Handover Drops by meaning of unsuccessful Handovers with loss of MS connection. Several indicators distinguish between different causes.

Formula: (a) 1] UNIHIALC[ ODropIntraCellH =

(b) OAttIntraCellH

ODropIntraCellH ODropRateIntraCellH =

(c) ]ATINHIAC[c

]UNINHOIA[c-]SINTHITA[c-]ATINHIAC[c [c]ODropRateCIntraCellH =


Used param.: UNIHIALC[1], ATINHIAC[1..12], SINTHITA[1..12], UNINHOIA[1..12], IntraCellHOAtt (11.1.1a)

Elem. Object: Cell

Unit: None

Remarks: SDCCH handovers are also incremented in this formulas. User release during Handover will lead to very small systematic errors.


System

66 A30808-X3247-A912-1-7618

11.1.4 Handover Distribution

Long name: (a) Intra Cell Handover Distribution

Short name: (a) IntraCellHODist[c]

Description: These indicators will give you the Intra Cell Handover Distribution for analysing the reason for started Intra Cell Handovers.

Formula: (a)

OAttIntraCellH

]ATINHIAC[c ODist[c]IntraCellH =


Used param.: ATINHIAC[1..12], IntraCellHOAtt (11.1.1a)

Elem. Object: Cell

Unit: None


11.1.5 SDCCH Handover Success Rate

Long name: Intra Cell SDCCH Handover Success Rate

Short name: IntraCellSDHOSuccRate

Description: These indicators will give you the rate of successful Intra Cell SDCCH Handovers.

Formula:

]AISHINTR[1

]SISHINTR[1 eDHOSuccRatIntraCellS =

Used param.: SISHINTR[1], AISHINTR[1]

Elem. Object: Cell

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 67

11.2 Inter Cell Intra BSC Handovers


Long name: (a) Number of Inter Cell Intra BSC Handover Attempts

(b) Number of Inter Cell Intra BSC Handover Successes

(c) Inter Cell Intra BSC Handover Success Rate

(d) Inter Cell Intra BSC Handover Success Rate per cause

Short name: (a) InterCellHOAtt

(b) InterCellHOSucc

(c) InterCellHOSuccRate

(d) InterCellHOSuccRateC[c]

Description: These indicators will give you the number and rate of successful Intra Cell Handovers. Several indicators distinguish between different causes.

Formula: (a) ll]AOUINIRH[a OAtt InterCellH =

(b) ll]SOUINIRH[a OSuccInterCellH =

(c) OAttInterCellH

OSuccInterCellH OSuccRateInterCellH =

(d) c]44*AOUINIRH[n

c]44*SOUINIRH[n [c]OSuccRateCInterCellH

+

+

=

with n for the nth number of neighbourcell relation (n=0..31)

with c=1 for uplink quality for complete-complete area … … with c=11 for forced handover due to Preemption for complete-complete area with c=12 for uplink quality for complete-inner area … … with c=22 for forced handover due to Preemption for complete-inner area with c=23 for uplink quality for inner-complete area … … with c=33 for forced handover due to Preemption for inner-complete area with c=34 for uplink quality for inner-inner area … … with c=44 for forced handover due to Preemption for inner-inner area

Used param.: AOUINIRH[all], SOUINIRH[all]

Elem. Object: Neighbourcell

Unit: None



System

68 A30808-X3247-A912-1-7618


Long name: (a) Number of Inter Cell Intra BSC Handover Failures

(b) Inter Cell Intra BSC Handover Failure Rate

(c) Inter Cell Intra BSC Handover Failure Rate per Cause

Short name: (a) InterCellHOFail

(b) InterCellHOFailRate

(c) InterCellHOFailRateC[c]

Description: These indicators will give you the number and rate of Inter Cell Intra BSC Handover Failures by meaning of unsuccessful Handovers without loss of MS connection because of reversion to old cell. Several indicators distinguish between different causes.

Formula: (a) ll]a UNINHOIE[ OFailInterCellH =

(b) OAttInterCellH

OFailInterCellH OFailRateInterCellH =

(c) c]44*AOUINIRH[n

c]44*UNINHOIE[n [c]OFailRateCInterCellH

+

+=



Used param.: UNINHOIE[all], AOUINIRH[all], InterCellHOAtt (11.2.1a)


Unit: None



System

A30808-X3247-A912-1-7618 69


Long name: (a) Number of Inter Cell Intra BSC Handover Drops

(b) Inter Cell Intra BSC Handover Drop Rate

(c) Inter Cell Intra BSC Handover Drop Rate per cause

Short name: (a) InterCellHODrop

(b) InterCellHODropRate

(c) InterCellHODropRateC[c]

Description: These indicators will give you the number and rate of Intra Cell Handover Drops by meaning of unsuccessful Handovers with loss of MS connection. Several indicators distinguish between different causes.

Formula: (a) OFailInterCellH-OSuccInterCellH-OAttInterCellHODropInterCellH =

(b) OAttInterCellH

ODropInterCellHODropRateInterCellH =

(c) c]44*AOUINIRH[n

c]44*[n UNINHOIE)- SOUINIRH - (AOUINIRH [c]ODropRateCInterCellH

+

+=



Used param.: AOUINIRH[all], SOUINIRH[all], UNINHOIE[all], InterCellHOAtt (11.2.1a), InterCellHOSucc (11.2.1b), InterCellHOFail (11.2.2a)


Unit: None



System

70 A30808-X3247-A912-1-7618


Long name: (a) Inter Cell Intra BSC Handover Distribution

(b) Imperative Inter Cell Handover Rate

Short name: (a) InterCellHODist[c]

(b) ImpInterCellHORate

Description: These indicators will give you the Inter Cell Intra BSC Handover Distribution for analysing the reason for started Inter Cell Intra BSC Handovers.

Formula: (a)

OAttInterCellH

c]44*AOUINIRH[n ODist[c]InterCellH

+

=



(b) OAttInterCellH

c]44*AOUINIRH[n llHORateImpInterCe

+

=


with c=1 for uplink quality for complete-complete area with c=2 for downlink quality for complete-complete area with c=3 for uplink strength for complete-complete area with c=4 for downlink strength for complete-complete area with c=5 for distance for complete-complete area with c=12 for uplink quality for complete-inner area … … with c=16 for distance for complete-inner area with c=23 for uplink quality for inner-complete area … … with c=27 for distance for inner-complete area with c=34 for uplink quality for inner-inner area … … with c=38 for distance for inner-inner area

Used param.: AOUINIRH[all], InterCellHOAtt (11.2.1a)


Unit: None



System

A30808-X3247-A912-1-7618 71

11.2.5 Incoming Handover Success Rate

Long name: Inter Cell Intra BSC Incoming Handover Success Rate

Short name: InterCellIncHOSuccRate

Description: This indicator will give you the rate of successful Inter Cell Intra BSC Incoming Handovers.

Formula:

]AININIRH[n

]SININIRH[n tencHOSuccRaInterCellI =


Used param.: SININIRH[1..32], AININIRH[1..32]


Unit: None

Remarks: SDCCH handovers are also increment in the counters used for this formula and that fact can lead to systematic errors.


Long name: Inter Cell Intra BSC SDCCH Handover Success Rate

Short name: InterCellSDHOSuccRate

Description: This indicator will give you the rate of successful Inter Cell Intra BSC SDCCH Handovers.

Formula:

]AISHINTE[1

]SISHINTE[1 eDHOSuccRatInterCellS =

Used param.: SISHINTE[1], AISHINTE[1]

Elem. Object: Cell

Unit: None

Remarks: None


System

72 A30808-X3247-A912-1-7618

11.3 Inter Cell Inter BSC Handovers


Long name: (a) Number of Inter Cell Inter BSC Handover Attempts

(b) Number of Inter Cell Inter BSC Handover Successes

(c) Inter Cell Inter BSC Handover Success Rate

(d) Inter Cell Inter BSC Handover Success Rate per cause

Short name: (a) InterBSCHOAtt

(b) InterBSCHOSucc

(c) InterBSCHOSuccRate

(d) InterBSCHOSuccRateC[c]

Description: These indicators will give you the rate and number of successful Inter Cell Inter BSC Handovers. Several indicators distinguish between different causes.

Formula: (a) ll]ATINBHDO[a Att InterBSCHO =

(b) ll]SUINBHDO[a SuccInterBSCHO =

(c) AttInterBSCHO

SuccInterBSCHO SuccRateInterBSCHO =

(d) c]10*ATINBHDO[n

c]10*SUINBHDO[n c]SuccRateC[InterBSCHO

+

+

=


with c=1 for uplink quality with c=2 for downlink quality with c=3 for uplink strength with c=4 for downlink strength with c=5 for distance with c=6 for better cell with c=7 for directed retry with c=8 for forced handover due to O&M with c=9 for fast uplink with c=10 for forced handover due to Preemption

Used param.: ATINBHDO [all], SUINBHDO[all]


Unit: None



System

A30808-X3247-A912-1-7618 73


Long name: (a) Number of Inter Cell Inter BSC Handover Failures

(b) Inter Cell Inter BSC Handover Failure Rate

(c) Inter Cell Inter BSC Handover Failure Rate per cause

Short name: (a) InterBSCHOFail

(b) InterBSCHOFailRate

(c) InterBSCHOFailRateC[c]

Description: These indicators will give you the rate and number of Inter Cell Inter BSC Handover Failures by meaning of unsuccessful Handovers without loss of MS connection because of reversion to old cell. Several indicators distinguish between different causes.

Formula: (a) ll]NRUNINHD[a FailInterBSCHO =

(b) AttInterBSCHO

FailInterBSCHO FailRateInterBSCHO =

(c) c]10*ATINBHDO[n

]c 10*NRUNINHD[n c]FailRateC[InterBSCHO

+

+

=



Used param.: NRUNINHD[all], ATINBHDO[all], InterBSCHOAtt (11.3.1a)


Unit: None



System

74 A30808-X3247-A912-1-7618


Long name: (a) Number of Inter Cell Inter BSC Handover Drops

(b) Inter Cell Inter BSC Handover Drop Rate

(c) Inter Cell Inter BSC Handover Drop Rate per cause

Short name: (a) InterBSCHODrop

(b) InterBSCHODropRate

(c) InterBSCHODropRateC[c]

Description: These indicators will give you the rate and number of Inter Cell Inter BSC Handover Drops by meaning of unsuccessful Handovers with loss of MS connection. Several indicators distinguish between different causes.

Formula: (a) FailInterBSCHO -SuccInterBSCHO -AttInterBSCHO DropInterBSCHO =

(b) AttInterBSCHO

DropInterBSCHODropRateInterBSCHO =

(c) c]10*ATINBHDO[n

c]10*nNRUNINHD)[-SUINBHDO - (ATINBHDOc]DropRateC[InterBSCHO

+

+

=



Used param.: ATINBHDO[all], SUINBHDO[all], NRUNINHD[all], InterBSCHOAtt (11.3.1a), InterBSCHOSucc (11.3.1b), InterBSCHOFail (11.3.2a)


Unit: None



System

A30808-X3247-A912-1-7618 75


Long name: (a) Inter Cell Inter BSC Handover Distribution

(b) Imperative Inter Cell Inter BSC Handover Rate

Short name: (a) InterBSCHODist[c]

(b) ImpInterBSCHORate

Description: These indicators will give you the Inter Cell Inter BSC Handover Distribution for analysing the reason for started Inter Cell Inter BSC Handovers.

Formula:

(a) AttInterBSCHO

c]10*ATINBHDO[n Dist[c]InterBSCHO

+

=


with c=1 for uplink quality with c=2 for downlink quality with c=3 for uplink strength with c=4 for downlink strength with c=5 for distance with c=6 for better cell with c=7 for directed retry with c=8 for forced handover due to O&M with c=9 for fast uplink

with c=10 for forced handover due to Preemption

(b) AttInterBSCHO

c]10*ATINBHDO[n CHORateImpInterBS

+

=


with c=1 for uplink quality with c=2 for downlink quality with c=3 for uplink strength with c=4 for downlink strength

Used param.: ATINBHDO[all], InterBSCHOAtt (11.3.1a)


Unit: None



System

76 A30808-X3247-A912-1-7618

11.3.5 Incoming Handover Success Rate

Long name: (a) Number of Successful Inter BSC Incoming HO

(b) Number of Attempted Inter BSC Incoming HO

(c) Inter Cell Inter BSC Incoming Handover Success Rate

Short name: (a) InterBSCIncHOSucc

(b) InterBSCIncHOAtt

(c) InterBSCIncHOSuccRate

Description: These indicators will give you the rate and number of successful Inter Cell Inter BSC Incoming Handovers.

Formula: (a)

..32]SININIRH[1 -..18]NSUCCHPC[7 -OSuccIntraCellH

-,3]TASSSUCC[2-,2]SUCTCHSE[1 cHOSuccInterBSCIn =

(b)

..32]AININIRH[1-..14]ATIMASCA[7-OSuccIntraCellH

- 3]TASSATT[2,-2]ATTCHSE[1,cHOAttInterBSCIn =

(c) cHOAttInterBSCIn

cHOSuccInterBSCIn ecHOSuccRatInterBSCIn =

Used param.: SUCTCHSE[1,2], TASSSUCC[2,3], NSUCCHPC[7..18], SININIRH[1..32], ATTCHSE[1,2], TASSATT[2,3], ATIMASCA[7..14], AININIRH[1..32], IntraCellHOSucc(11.1.1b)

Elem. Object: Cell

Unit: None



Long name: (a) Inter Cell Inter BSC SDCCH Handover Success Rate

Short name: (a) InterBSCSDHOSuccRate

Description: This indicator will give you the rate of successful Inter Cell Inter BSC SDCCH Handovers.

Formula:

(a) ]AOINTESH[1

]SOINTESH[1 HOSuccRateInterBSCSD =

Used param.: SOINTESH[1], AOINTESH[1]

Elem. Object: Cell

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 77

11.4 Other Handover Performance Indicators

11.4.1 Handovers per Erlanghour

Long name: (a) Handover per Erlanghour

Short name: (a) HoperErlh

Description: This indicator will give you the ratio between successful Handovers and the traffic in Erlanghour.

Formula: (a)

[ ][ ] yGranularit

60*

allMEBUSTCH

]all[SUINBHDOallSINHOBSC tioHOPerErlRa

+=

Used param.: SINHOBSC[all], SUINBHDO[all], MEBUSTCH[all], Granularity in minutes

Elem. Object: Cell

Unit: None

Remarks: SDCCH handovers are also incremented in these counters used for this formula and that fact can lead to systematic errors.

11.4.2 Handovers per Call Rate

Long name: (a) Handovers per Call Rate

Short name: (a) HOperCallRatio

Description: This indicator will give you the ratio between Handovers and Call Setups.

Formula: (a)

..5]TASSSUCC[2

10]10*n..SUINBHDO[1 ..11]SINTHINT[1 ..12]SINTHITA[1 atioHOperCallR

+++

=


Used param.: SINTHITA[1..12], SINTHINT[1..11], SUINBHDO[1..n*10+10], TASSSUCC[2..5]

Elem. Object: Cell

Unit: None

Remarks: The Handovers per Call Rate is related to the Assignment Procedure. SDCCH handovers are also incremented in these counters used for this formula and that fact can lead to systematic errors.


System

78 A30808-X3247-A912-1-7618

11.4.3 Successful Directed Retries

Long name: (a) Number of Successful Directed Retries

Short name: (a) NoSuccDirectedRetry

Description: This indicator will give you the number of successful outgoing Handovers due to directed retry (Inter and Intra BSC).

Formula:

(a) [ ] [ ]∑=

++++=

3

0i

711*i44*nSOUINIRH710*nSUINBHDO ctedRetry NoSuccDire


Used param.: SUINBHDO[n*10+7], SOUINIRH[n*44+7, n*44+18, n*44+29, n*44+40]


Unit: None

Remarks: None

11.4.4 Imperative Outgoing Handover Rate

Long name: (a) Imperative Outgoing Handover Rate

Short name: (a) ImpOutgHORate

Description: This indicator will give you the rate of handovers due to Imperative reasons namely UpLink/DownLink Strength and UpLink/DownLink Quality from the total number of outgoing Handovers (Inter and Intra BSC).

Formula:

(a) ll]AOUINIRH[a ll]ATINBHDO[a

c]11*i44*AOUINIRH[nc]10*ATINBHDO[n

ateImpOutgHOR

4

1c

3

0i

+

++++

=

∑ ∑= =


with c=1 for uplick quality with c=2 for downlink quality with c=3 for uplink strength with c=4 for downlink strength

Used param.: AOUINIRH[all] , ATINBHDO[all]


Unit: None



System

A30808-X3247-A912-1-7618 79

11.4.5 Handover Indication Rejection Rate

Long name: (a) Handover Indication Rejection Rate

Short name: (a) HOIndRejRate

Description: This indicator will give you the Handover Indication Rejection Rate by meaning the number of Handover indications not resulting in a Handover Attempt divided by the number of all Handover indications. Reasons for this can be congestions or coverage problems.

Formula: (a)

AttInterBSCHOOAttInterCellHOAttIntraCellH]4..1[NHOINRHA

]4..1[NHOINRHAteHOIndRejRa

+++

=

Used param.: NHOINRHA [1..4], IntraCellHOAtt(11.1.1a), InterCellHOAtt(11.2.1a), InterBSCHOAtt(11.3.1a)

Elem. Object: Cell

Unit: None

Remarks: Please note: With counter NHOINRHA[1] it is also possible to measure the number of Handover not resulting in an Handover Attempt due to empty neighbourcell list. The reason for this is mainly related to coverage problems.


System

80 A30808-X3247-A912-1-7618

12 Power and Quality Measurements

12.1 Interference Band Rate on idle TCH

Long name: (a) Interference Band Rate on idle TCH

Short name: (a) IfBandRate[n]

Description: This indicator will give you Interference Band Rate on idle TCH. Several indicators distinguish between different interference bands.

Formula: (a)

[1..5] MEITCHIB

[n] MEITCHIB [n]IfBandRate =

with n=1 for Interference band 1 with n=2 for Interference band 2 with n=3 for Interference band 3 with n=4 for Interference band 4 with n=5 for Interference band 5

Used param.: MEITCHIB[1..5]

Elem. Object: Cell

Unit: None

Remarks: None

12.2 Quality Link for N% FER

Long name: (a) Quality Link for N% FER

Short name: (a) QualityLinkNFER

Description: This indicator will give you the total reported FER uplink values that were under the threshold FER=N%. It is an indicator of the speech quality provided to the TRX users.

Formula:

(a)

[1..64] CFERRXQU

8]8*1..i8*[i CFERRXQU

kNFERQualityLin

n

0i

∑=

++

=

Where n is the FER band that has it’s upper limit equal or lower to N%

Used param,: CFERRXQU[1..64]

Elem. Object: TRX

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 81

12.3 Mean FER UpLink

Long name: (a) Mean FER UpLink

Short name: (a) MeanFERUL

Description: This indicator provides the average FER Band on the Uplink.

Formula:

(a)

( )( )

[1..64] CFERRXQU

8]8*1..i8*[i CFERRXQU*1i

MeanFERUL

7

0i

∑=

+++

=


Elem. Object: TRX

Unit: FER Band

Remarks: None.


System

82 A30808-X3247-A912-1-7618

12.4 Power and Quality limits for N% Percentile on busy TCH

Long name: (a) RXLEV for N% Percentile Uplink on busy TCH

(b) RXLEV for N% Percentile Downlink on busy TCH

(c) RXQUAL for N% Percentile Uplink on busy TCH

(d) RXQUAL for N% Percentile Downlink on busy TCH

Short name: (a) RxLvNPercentileUL

(b) RxLvNPercentileDL

(c) RxQuNPercentileUL

(d) RxQuNPercentileDL

Description: These indicators will give you the information that N% of the measurements on busy channels registered a received Power Level below a certain Level Band and that N% of the measurements on busy channels registered a received Quality below a certain Quality Band. Two indicators distinguish between uplink and downlink.

Formula:

(a) 100

N

[1..64]PWRUPDW

n

1i[i])(PWRUPDW

such that n n with ntileULRxLvNPerce =

∑=

=

(b) 100

N

[217..280]PWRUPDW

n

1ii])[216(PWRUPDW

such that n n with ntileDLRxLvNPerce =

∑=

+

=

(c) 100

N

[65..72]PWRUPDW

n

1ii])[64(PWRUPDW

such that n n with ntileULRxQuNPerce =

∑=

+

=

(d) 100

N

[281..288]PWRUPDW

n

1ii])[280(PWRUPDW

such that n n with ntileDLRxQuNPerce =

∑=

+

=

Used param.: PWRUPWD[all]

Elem. Object: Channel

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 83

12.5 Mean Level and Quality on busy TCH

Long name: (a) Mean RXLEV Uplink on busy TCH

(b) Mean RXLEV Downlink on busy TCH

(c) Mean RXQUAL Uplink on busy TCH

(d) Mean RXQUAL Downlink on busy TCH

Short name: (a) MeanRxLvUL

(b) MeanRxLvDL

(c) MeanRxQuUL

(d) MeanRxQuDL

Description: These indicators will give you the mean RXLEV and RXQUAL on busy TCH. Two indicators distinguish between uplink and downlink.

Formula:

(a) [1..64]PWRUPDW

[i])PWRUPDW *(i

MeanRxLvUL

64

1i

∑=

=

(b) [217..280]PWRUPDW

i])[216PWRUPDW *(i

MeanRxLvDL

64

1i

∑=

+

=

(c) [65..72]PWRUPDW

i])[64PWRUPDW *(i

MeanRxQuUL

8

1i

∑=

+

=

(d) [281..288]PWRUPDW

i])[280PWRUPDW *(i

MeanRxQuDL

8

1i

∑=

+

=

Used param: PWRUPWD[all]

Elem. Object: Channel

Unit: None

Remarks: None


System

84 A30808-X3247-A912-1-7618

12.6 TA Distribution

Long name: (a) TA Distribution

Short name: (a) TADist[n]

Description: These indicators provide the rate of received samples having timing advance in TA Band equal to ‘n’ .

Formula:

(a) [1..64] CRXLVTAU) (CRXLVTAD

1]n8[i CRXLVTAU)(CRXLVTAD

TADist[n]

7

0i

+

++×+

=

∑=

Where n=0..7

Used param.: CRXLVTAD[1..64], CRXLVTAU[1..64]

Elem. Object: TRX

Unit: None

Remarks: The range of the used measurements (SCANCTRX measurements) can be configured and is therefore relevant for the analysis of the results.

12.7 RXQUAL Distribution

Long name: (a) RXQUAL Distribution DownLink

(b) RXQUAL Distribution UpLink

Short name: (a) RxQuDistDL[n]

(b) RxQuDistUL[n]

Description: These indicators provide the rate of received samples having the received BER in Quality Band equal to ‘n’. Two indicators distinguish between uplink and downlink.

Formula:

(a) [1..64] CRXLVQUD

1]n8[i CRXLVQUD

[n]RxQuDistDL

7

0i

∑=

++×

=

(b) [1..64] CRXLVQUU

1]n8[i CRXLVQUU

[n]RxQuDistUL

7

0i

∑=

++×

=

Where n=0..7

Used param.: CRXLVQUD[1..64], CRXLVQUU[1..64]

Elem. Object: TRX

Unit: None



System

A30808-X3247-A912-1-7618 85

12.8 RXLEV Distribution

Long name: (a) RXLEV Distribution DownLink

(b) RXLEV Distribution UpLink

Short name: (a) RxLvDistDL[n]

(b) RxLvDistUL[n]

Description: These indicators provide the rate of received samples having the received Level in Level Band equal to ‘n’. Two indicators distinguish between uplink and downlink.

Formula: (a)

[1..64] CRXLVQUD

8]81..n8[n CRXLVQUD[n]RxLvDistDL

+×+×=

(b) [1..64] CRXLVQUU

]88n..18[n CRXLVQUU[n]RxLvDistUL

+×+×=

Where n=0..7

Used param.: CRXLVQUD[1..64], CRXLVQUU[1..64]

Elem. Object: TRX

Unit: None


12.9 FER Distribution

Long name: (a) FER Distribution

Short name: (a) FERDist[n]

Description: These indicators provide the rate of received samples having the uplink FER in FER Band equal to ‘n’.

Formula: (a)

[1..64] CFERRXQU

8]8n..18[n CFERRXQUFERDist[n]

+×+×=

Where n=0..7

Used param.: CFERRXQU[1..64]

Elem. Object: TRX

Unit: None



System

86 A30808-X3247-A912-1-7618

12.10 Mean FER UpLink per RXQUAL

Long name: (a) Mean FER UpLink per RXQUAL Band

Short name: (a) MeanFERULforRxQu[n]

Description: These indicators provide the average FER Band on the uplink for each Quality Band. The implementation of certain features like frequency hoping improves the FER for the same RXQUAL values and therefore, FER is more accurate indicator for analysing the quality of the connection or speech quality.

Formula:

(a)

( )( )

∑

∑

=

=

++×

++××+

=7

0i

7

0i

1]n8[i CFERRXQU

1]n8[i CFERRXQU1i

[n]orRxQu MeanFERULf

Where n =0..7


Elem. Object: TRX

Unit: FER Band



System

A30808-X3247-A912-1-7618 87

12.11 Mean RXLEV per RXQUAL Band

Long name: (a) Mean RXLEV per RXQUAL Band DownLink

(b) Mean RXLEV per RXQUAL Band UpLink

Short name: (a) MeanRxLvforRxQuDL[n]

(b) MeanRxLvforRxQuUL[n]

Description: These indicators provide the average RXLEV Band for each Quality Band either Uplink or Downlink. High interference levels can be associated to high RXLEV averages in the higher Quality Bands.

Formula:

(a)

( )( )

∑

∑

=

=

++×

++××+

=7

0i

7

0i

1]n8[i CRXLVQUD

1]n8[i CRXLVQUD1i

[n] rRxQuDLMeanRxLvfo

(b)

( )( )

∑

∑

=

=

++×

++××+

=7

0i

7

0i

1]n8[i CRXLVQUU

1]n8[i CRXLVQUU1i

[n] rRxQuULMeanRxLvfo

Where n =0..7

Used param,: CRXLVQUU[1..64], CRXLVQUD[1..64]

Elem. Object: TRX

Unit: Level Band



System

88 A30808-X3247-A912-1-7618

12.12 Mean RXLEV per TA Band

Long name: (a) Mean RXLEV per TA Band DownLink

(b) Mean RXLEV per TA Band UpLink

Short name: (a) MeanRxLvforTADL

(b) MeanRxLvforTAUL

Description: These indicators provide the average RXLEV Band for each Timing Advance Band either Uplink or Downlink.

Formula:

(a)

( )( )

∑

∑

=

=

++

+++

=7

0i

7

0i

1]n8*[i CRXLVTAD

1]n8*[i CRXLVTAD*1i

[n] rTADLMeanRxLvfo

(b)

( )( )

∑

∑

=

=

++

+++

=7

0i

7

0i

1]n8*[i CRXLVTAU

1]n8*[i CRXLVTAU*1i

[n] rTAULMeanRxLvfo

Where n =0..7

Used param.: CRXLVTAD[1..64], CRXLVTAU[1..64]

Elem. Object: TRX

Unit: Level Band



System

A30808-X3247-A912-1-7618 89

12.13 High RXLEV with Low RXQUAL Rate

Long name: (a) High RXLEV With Low RXQUAL Rate DownLink

(b) High RXLEV With Low RXQUAL Rate UpLink

Short name: (a) HighLvLowQuRateDL

(b) HighLvLowQuRateUL

Description: These indicators will give the rate of RXLEVs that were reported for the two highest Level Bands (i.e. Level Bands: RXLEV_6 and RXLEV_7) and for the four highest Quality Bands (i.e. Quality Bands: RXQUAL_4, RXQUAL_5, RXQUAL_6 and RXQUAL_7) from the total samples for the four highest Quality Bands. High values for this indicator are usually related to interference problems.

Formula: (a)

..64],53..56,61.40,45..4829..32,37.16,21..24,[5..8,13.. CRXLEQUD

..64][53..56,61 CRXLVQUDuRateDLHighLvLowQ =

(b) ..64],53..56,61.40,45..4829..32,37.16,21..24,[5..8,13.. CRXLEQUD

..64][53..56,61 CRXLVQUDuRateULHighLvLowQ =

Used param.: CRXLVQUD [5..8,13..16,21..24,29..32,37..40,45..48,53..56,61..64], CRXLVQUU [5..8,13..16,21..24,29..32,37..40,45..48,53..56,61..64]

Elem. Object: TRX

Unit: None



System

90 A30808-X3247-A912-1-7618

12.14 TCH Traffic Type Distribution

Long name: (a) TCH full rate speech traffic channel Rate

(b) TCH enhanced full rate speech traffic channel Rate

(c) TCH adaptive multirate full rate speech traffic channel Rate

(d) TCH full rate data traffic channel Rate

(e) TCH half rate speech traffic channel Rate

(f) TCH adaptive multirate half rate speech traffic channel Rate

Short name: (a) TCHFSRate

(b) TCHEFSRate

(c) TCHAFSRate

(d) TCHFDRate

(e) TCHHSRate

(f) TCHAHSRate

Description: These indicators provide the TCH Traffic Type Distribution, by meaning the traffic for a individual traffic type compared to the total traffic for all traffic channels. Different indicators distinguish between full rate speech, enhanced full rate speech, adaptive multirate full rate speech, full rate data, half rate speech and adaptive multirate half rate speech TCHs.

Formula: (a)

..6]MBTCHAMR[1

[1] MBTCHAMR TCHFSRate =

(b) ..6]MBTCHAMR[1

[2] MBTCHAMR TCHEFSRate =

(c) ..6]MBTCHAMR[1

[3] MBTCHAMR TCHAFSRate =

(d) ..6]MBTCHAMR[1

[4] MBTCHAMR TCHFDRate =

(e) ..6]MBTCHAMR[1

[5] MBTCHAMR TCHHSRate =

(f) ..6]MBTCHAMR[1

[6] MBTCHAMR TCHAHSRate =

Used param.: MBTCHAMR[1..6]

Elem. Object: Cell

Unit: None

Remarks: None


System

A30808-X3247-A912-1-7618 91

12.15 Adaptive Multirate Distribution

Long name: (a) Adaptive Multirate channel type usage

Short name: (a) AMRCHTUsage

Description: These indicators provide the Adaptive Multirate channel type usage and will give you an overview about the quality of the feature Adaptive multirate (AMR). Separate counters distinguish between the different adaptive multirate channel types (8 for adaptive multirate full rate speech, and 4 for adaptive multirate half rate speech) and between uplink / downlink transmission. These indicators provide how often a specific adaptive multirate channel type was used related to all adaptive multirate channel types for one direction (uplink / downlink).

Formula: (a)

100

]AMRCHDIS[n eAMRCHTUsag =

with n =

1 for TCH/AFS 12.2 uplink (AMR full rate speech, 12.2 kbit/s, uplink)








9 for TCH/AHS 6.7 uplink (AMR half rate speech, 6.7 kbit/s, uplink)




13 for TCH/AFS 12.2 downlink (AMR full rate speech, 12.2 kbit/s, downlink)








21 for TCH/AHS 6.7 downlink (AMR half rate speech, 6.7 kbit/s, downlink)




Used param.: AMRCHDIS[1..24]

Elem. Object: Cell

Unit: None

Remarks: AMRCHDIS must be diveded by 100 in this formula, because the measured value is in percent and KPI`s shouldn`t be in percent.


System

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13 Availability related Performance Indicators

13.1 Tranceiver Availability

Long name: (a) Tranceiver Availability

Short name: (a) TRXAvail

Description: This indicator will give you the TRX Availability.

Formula: (a)

60s *y Granularit

[1] TRANAVTI TRXAvail=

Used param.: TRANAVTI[1], Granularity in minutes

Elem. Object: TRX

Unit: None

Remarks: None

13.2 TCH Distribution Rate

Long name: (a) TCH Full Rate

(b) TCH Half Rate

Short name: (a) FR

(b) HR

Description: This indicator will give you the Rate of configured Full Rate and Half Rate traffic channels compared to the total number of traffic channels.

Formula: (a)

,6,9,12]NRDEFTCH[3

,9]NRDEFTCH[3 FR =

(b) ,6,9,12]NRDEFTCH[3

,12]NRDEFTCH[6 HR =

Used param.: NRDEFTCH[1..12]

Elem. Object: Cell

Unit: None

Remarks: Due to feature ‘Smooth Channel Modification’ now all timeslots configured as TCH and or TCH/SD with pooltype 'TCH_Pool' or TCH/SD with pooltype 'TCH_SD_Pool' are considered for measurement NRDEFTCH.


System

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13.3 TCH Efficency

Long name: (a) TCH Efficency Full Rate

(b) TCH Efficency Half Rate

(c) TCH Efficency Dual Rate

Short name: (a) TCHEffFR

(b) TCHEfflHR

(c) TCHEffDR

Description: This indicator will give you the TCH Efficency (Rate).

Formula: (a)

,9]NRDEFTCH[3

]NAVTCH[3,9 TCHEffFR =

(b) ,12]NRDEFTCH[6

2]NAVTCH[6,1 TCHEffHR =

(c) ,12]NRDEFTCH[6*5,0 ,9]NRDEFTCH[3

2]NAVTCH[6,1*5,0]NAVTCH[3,9 TCHEffDR

+

+=

Used param.: NAVTCH[3,6,9,12], NRDEFTCH[3,6,9,12]

Elem. Object: Cell

Unit: None

Remarks: Due to feature ‘Smooth Channel Modification’ now all timeslots configured as TCH and or TCH/SD with pooltype 'TCH_Pool' or TCH/SD with pooltype 'TCH_SD_Pool' are considered for measurement NRDEFTCH.

Due to feature ‘Smooth Channel Modification’ now all configured timeslots possible to use as TCH are considered for measurement NAVTCH (Timeslots configured as TCH or TCH/SD with pooltype TCH_Pool' or TCH/SD with pooltype 'TCH_SD_Pool').


System

94 A30808-X3247-A912-1-7618

13.4 SDCCH Efficency

Long name: (a) SDCCH Efficency

Short name: (a) SDCCHEff

Description: This indicator will give you the SDCCH Efficency (Rate).

Formula:

(a) 3]NRDESDCCH[

[3] NAVSDCCH SDCCHEff =

Used param.: NAVSDCCH[3], NRDESDCCH[3]

Elem. Object: Cell

Unit: None

Remarks: Due to feature ‘Smooth Channel Modification’ now all timeslots configured as SDCCH and TCH/SD with pooltype 'SDCCH_Pool' are considered for measurement NRDESDCCH.

Due to feature ‘Smooth Channel Modification’ now all configured timeslots possible to use as SDCCH, belonging to the SDCCH _Pool and the TCH/SD_Pool, are considered for measurement NAVSDCCH (Timeslots configured as SDCCH or TCH/SD with pooltype ‘SDCCH_Pool’).


System

A30808-X3247-A912-1-7618 95

14 GPRS Related Performance Indicators

14.1 Packet Data Access Successful Rate

Long Name: (a) Packet Data Access Successful Rate

Short Name: (a) PDAccSuccRate

Description : This indicator provides the successful access probability to the GPRS service.

Formula: (a)

]NUACATCL[1

]SULACCEL[1atePDAccSuccR =

Used param.: SULACCEL[1]; NUACATCL[1]

Elem. Object: Cell

Unit: None

Remark: This indicator include the answer to paging send on CCCH, this means that indicator include the successful rate to the network access caused by answer to paging coming from CCCH. Only uplink accesses are counted.

14.2 Packet Access Rejections due to Congestion

Long Name: (a) Packet Access Reject Rate due to Congestion uplink

(b) Packet Access Reject Rate due to Congestion downlink

Short Name: (a) PAccRejConUL

(b) PAccRejConDL

Description : This indicator provides the number of rejected GPRS accesses due to resource unavailability (Number of TBF rejections). This indicator will measure in uplink and downlink direction.

Formula: (a) NTBFRJC[1]ULPAccRejCon =

(b) NTBFRJC[2]DLPAccRejCon =

Used param.: NTBFRJC[1,2]

Elem. Object: Cell

Unit: None

Remark: None


System

96 A30808-X3247-A912-1-7618

14.3 Mean number of PDCH dynamically configured

Long Name: (a) Mean number of PDCH dynamically configured

Short Name: (a) MeanPDCHConf

Description : On this case "available" has meaning of GPRS configured channels. This number change dynamically from 0 to 7 related to the necessity of transport data packet for some GPRS active calls.

Formula: (a) NAVPDCH[3]nfMeanPDCHCo =

Used param.: NAVPDCH[3]

Elem. Object: Cell

Unit: None

Remark: None


System

A30808-X3247-A912-1-7618 97

14.4 Mean User Data Throughput on Gb

Long Name: (a) Mean User Data Uplink Throughput on Gb

(b) Mean Signalling Data Uplink Throughput on Gb

(c) Mean Data Uplink Throughput on Gb

(d) Mean User Data Downlink Throughput on Gb

(e) Mean Signalling Data Downlink Throughput on Gb

(f) Mean Data Downlink Throughput on Gb

Short Name: (a) MeanUserDataULGb

(b) MeanSigDataULGb

(c) MeanDataULGb

(d) MeanUserDataDLGb

(e) MeanSigDataDLGb

(f) MeanDataDLGb

Description : This indicator is an estimation of the mean user/signalling data throughput in byte per second per cell on Gb interface in the uplink/downlink direction..

Formula: (a) 8/1000MUTHBS[1]taULGbMeanUserDa ⋅=

(b) 8/1000MSTHBS[1]aULGbMeanSigDat ⋅=

(c) aULGbMeanSigDattaULGbMeanUserDaGbMeanDataUL +=

(d) 8/1000MUTHBS[2]taDLGbMeanUserDa ⋅=

(e) 8/1000MSTHBS[2]aDLGbMeanSigDat ⋅=

(f) aDLGbMeanSigDattaDLGbMeanUserDaGbMeanDataDL +=

Used param.: MUTHBS[1,2];MSTHBS[1,2];

Elem. Object: Cell

Unit: kbit/sec

Remark: None


System

98 A30808-X3247-A912-1-7618

14.5 Mean User Data Throughput on air interface

Long Name: (a) Mean User Data Uplink Throughput on air interface

(b) Mean Signalling Data Uplink Throughput on air interface

(c) Mean Data Uplink Throughput on air interface

(d) Mean User Data Downlink Throughput on air interface

(e) Mean Signalling Data Downlink Throughput on air interface

(f) Mean Data Downlink Throughput on air interface

Short Name: (g) MeanUserDataULUm

(h) MeanSigDataULUm

(i) MeanDataULUm

(j) MeanUserDataDLUm

(k) MeanSigDataDLUm

(a) MeanDataDLUm

Description : This indicator is an estimation of the mean user\signalling data throughput in byte per second per cell on air interface interface in the uplink\downlink direction..

Formula: (a) 8/1000MUTHRF[1]taULUmMeanUserDa ⋅=

(b) 8/1000MSTHRF[1]gULUmMeanUserSi ⋅=

(c) gULUmMeanUserSitaULUmMeanUserDaUmMeanDataUL +=

(d) 8/1000MUTHRF[2]taDLUmMeanUserDa ⋅=

(e) 8/1000MSTHRF[2]gDLUmRMeanUserSi ⋅=

(f) aDLUmMeanSigDattaDLUmMeanUserDaUmMeanDataDL +=

Used param.: MUTHRF[1,2], MSTHRF[1,2]

Elem. Object: Cell

Unit: kbit/sec

Remark: None


System

A30808-X3247-A912-1-7618 99

14.6 Packet data rate on GB

Long Name: (a) Uplink packet data rate Gb interface

(b) Downlink packet data rate Gb interface

Short Name: (a) PDataRateULGb

(b) PDataRateDLGb

Description : This indicator measures the data throughput per cell on Gb interface in the uplink\downlink direction..

Formula: (a)

GbMeanDataDLGbMeanDataUL

GbMeanDataULLGbPDataRateU

+

=

(b) GbMeanDataDLGbMeanDataUL

GbMeanDataDLLGbPDataRateD

+

=

Used param.: MeanDataULGb(11.4c), MeanDataDLGb (11.4f)

Elem. Object: Cell

Unit: None

Remark: None

14.7 Packet data rate on air interface

Long Name: (a) Uplink packet data rate on air interface

(b) Downlink packet data rate on air interface

Short Name: (a) PDataRateULUm

(b) PDataRateDLUm

Description : This indicator measures the packet data rate per cell on air interface in the uplink\downlink direction..

Formula: (a)

UmMeanDataDLUmMeanDataUL

UmMeanDataULLUmPDataRateU

+

=

(b) UmMeanDataDLUmMeanDataUL

UmMeanDataDLLUmPDataRateD

+

=

Used param.: MeanDataULUm(11.5c), MeanDataDLUm (11.5f)

Elem. Object: Cell

Unit: None

Remark: None


System

100 A30808-X3247-A912-1-7618

14.8 Mean Throughput per Configured PDCH

Long Name: (a) Mean Throughput Uplink per Configured PDCH

(b) Mean Throughput Downlink per Configured PDCH

Short Name: (a) MeanThputULPDCH

(b) MeanThputDLPDCH

Description : This indicator will give you the mean throughput per configured PDCH for uplink and downlink direction.

Formula: (a)

ConfMeanNoPDCH

taULUmMeanUserDa LPDCHMeanThputU =

(b) ConfMeanNoPDCH

taDLUmMeanUserDaLPDCHMeanThputD =

Used param.: MeanUserDataULUm (11.5a), MeanUserDataULUm (11.5d), MeanNoPDCHConf (11.3a)

Elem. Object: Cell

Unit: kbit/sec

Remark: Please note that no signalling and no RLC/MAC headers are included in this indicator. Therefore the real performance per PDCH is higher.


System

A30808-X3247-A912-1-7618 101

14.9 Retransmission Rate

Long Name: (a) Uplink Retransmission Rate

(b) Downlink Retransmission Rate

Short Name: (a) ULRetransRate

(b) DLRetransRate

Description : These indicators calculate a rough estimation of the retransmission rate, by the ratio of the throughput effectively digest and the throughput needed to have a correct data link transmission on air interface.

These indicators provide a rough estimation because of the assumption of a coding scheme usage (CS2 hardly coded) that is the worst case for retransmission.

If CS1 is used then the user must multiply the obtained value by the constant 20/30.

Formula:

(a) MSTHRF[1]MUTHRF[1]

60*yGranularit

30*NRETDPU[1]

ateULRetransR+

=

(b) MSTHRF[2]MUTHRF[2]

60*yGranularit

30*NRETDPU[2]

transRateReLD+

=

Used param.: MUTHRF[1,2], MSTHRF[1,2], NRETDPU[1,2]

Elem. Object: Cell

Unit: None

Remark: None


System

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14.10 Number of Packet Pagings

Long Name: (a) Number of Packet Pagings uplink

(b) Number of Packet Pagings downlink

Short Name: (a) PpagUL

(b) PpagDL

Description : This indicator provide the number of packet pagings on PCH (CCCH) and PPCH (PBCCH/PCCCH) for the uplink and downlink direction. Additionally downlink TBF assignments, which are sent towards the Ms on the PCH, are also counted.

Formula: (a) ]NATGPPAG[1PpagUL =

(b) ]NATGPPAG[2PpagDL =

Used param.: NATGPPAG [1,2]

Elem. Object: Cell

Unit: None

Remark: Downlink TBF assignments sent on the AGCH due to non-DRX mode are not counted.

14.11 Mean number of active TBF per cell

Long Name: (a) Mean number of active TBF per cell uplink

(b) Mean number of active TBF per cell downlink

Short Name: (a) MeanActTBFUL

(b) MeanActTBFDL

Description : This indicator provides the mean number of TBFs for the uplink and downlink direction which have been active during the granularity period.

Formula: (a) ]MEAOCPDC[1ULMeanActTBF =

(b) ]MEAOCPDC[2DLMeanActTBF =

Used param.: MEAOCPDC[1,2];

Elem. Object: Cell

Unit: None

Remark: None


System

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14.12 Total number of established TBF per cell

Long Name: (a) Total number of established TBF per cell uplink

(b) Total number of established TBF per cell downlink

Short Name: (a) TotEstTBFUL

(b) TotEstTBFDL

Description : This indicator calculates the total number of established TBF in a cell for the uplink and downlink direction.

Formula: (a) TNPDTCL[1]LTotEstTBFU =

(b) TNPDTCL[2]LTotEstTBFD =

Used param.: TNPDTCL[1,2]

Elem. Object: Cell

Unit: None

Remark: None

14.13 Access probability with no PDCH allocated

Long Name: (a) Access probability with no PDCH allocated

Short Name: (a) APNPDAL

Description : This indicator provides the probability that a GPRS access meet the networkwith no PDCH allocated.

Formula:

(a) ]NUACATCL[1

]TANRGPRS[1APNPDAL =

Used param.: NUACATCL[1];TANRGPRS[1]

Elem. Object: Cell

Unit: None

Remark: Only uplink accesses are counted.


System

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15 Miscellaneous Performance Indicators

15.1 BSC Processorload

Long name: (a) Mean BSC MPCC Processor load

(b) Mean BSC TDPC Processor load

(c) Mean BSC PCU0 Processor load

(d) Mean BSC PCU1 Processor load

Short name: (a) MPPCLoad

(b) TDPCLoad

(c) PCU0Load

(d) PCU1Load

Description: These indicators provide the processor load at the BSC for the MPCC (Administrative Processor), TDPC (Telephony Processor) and the processor for the Packet Control Unit:s.

Formula: (a)

100

]BSCPRCLD[2 MPPCLoad =

(b) 100

]BSCPRCLD[4 TDPCLoad =

(c) 100

]BSCPRCLD[6 PCU0Load =

(d) 100

]BSCPRCLD[8 PCU1Load =

Used param.: BSCPRCLD[2, 4, 6, 8]

Elem. Object: BSC

Unit: None

Remarks: None


System

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15.2 BTSE Processorload

Long name: (a) Mean BTSE Processor load

Short name: (a) BTSEPRLD

Description: This indicator provides the mean BTSE processor load.

Formula: (a)

100

]BTSEPRLD[1 BTSEPRLD=

Used param.: BTSEPRLD[1]

Elem. Object: BTS

Unit: None

Remarks: None

15.3 Paging / Location Update Ratio per Cell

Long name: (a) Paging / Location Update Ratio per Cell

Short name: (a) PagLocUpdRatioPerCell

Description: This indicator will give you the ratio between Pagings and Location Updates within a single cell.

Formula: (a)

[5,11,17] NSUCCHPC

13] 7, [1, NSUCCHPC CellatioPer PagLocUpdR =

Used param.: NSUCCHPC[1..16]

Elem. Object: Cell

Unit: None

Remarks: The Paging Ratio / Location Update Ratio per cell is related to the Immediate Assignment Procedure.


System

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15.4 BSC -> MSC CCS7 Load

Long name: (a) BSC -> MSC CCS7 Load

(b) MSC -> BSC CCS7 Load

(c) Total CCS7 Load

Short name: (a) Y BSC

(b) Y_MSC

(c) Y

Description: Approximate load on the Link Set between BSC and MSC, which were caused of MSUs sent by BSC, vice versa and total.

Formula: (a) Erl

ssbyteGRAN

MinLengthMSUNMSUTRASBSCY

60/8000

1_]1[_

⋅⋅

⋅∅⋅=

(b) ErlssbyteGRAN

MinLengthMSUNMSURECMSCY

60/8000

1_]1[_

⋅⋅

⋅∅⋅=

(c) Erl 2

Y_MSC Y_BSC Y

+

=

Used param.: NMSUTRAS[1], NMSUREC[1], Granularity in minutes

Elem. Object: Cell

Unit: Erlang

Remarks: ∅MSU_Length : Average length of a MSU. This value cannot be measured with the existing scanners. An assumption has to be made with the help of traffic models. At the present message structure the MSU has an average length about 35byte. With introduction or extension of services (for example SMS) this value will increase in future.


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16 BSS related KPIs at Siemens MSC

At the Siemens MSC/VLR it is also possible to start the following measurement jobs for BSS specific measurements:

• REC INTCELL: BSS specific measurements per cell

• REC LOCAREA: BSS specific measurements per Location Area

• RECMSC: MSC and BSS specific measurements per MSC

With the above Siemens performance measurements it is possible to evaluate at least the following key performance indicators:

• Location Update Success Rate per Location Area

• Paging Success Rate per Location Area

• Paging Ratio / Location Update Ratio per Location Area

• Handover Failures per Cell

• Handover Successes per Cell

• Dropped Calls per Cell

• Call Setup Failures per Cell

• Assignment Failures per Cell

• TCH Requests per Cell

• Busy Hour Call Attempts (BHCA) per MSC

• Mean Holding Time per MSC

• MOC / MTC / MTM distribution

For more information please refer to the SSS customer documentation.


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17 Appendix

17.1 List of BSS Performance Measurements

Short Name Long Name

AALTCHTI All available TCH allocated time

AININIRH Attempted incoming internal intercell Handovers per originating cell

AISHINTE Attempted Internal SDCCH Handovers Intercell

AISHINTR Attempted internal SDCCH Handovers Intracell

AMRCHDIS Adaptive Multirate channel type uplink/downlink distribution

AOINTESH Attempted MSC controlled SDCCH Handovers

AOUINIRH Attempted outgoing intercell Handovers per cause, per neigh-bourcell relationship

ASDCALTI All available SDCCH allocated time

ATCHSMBS Attempted TCH seizures meeting a TCH blocked state (Full-rate/Halfrate)

ATIMASCA Attempted immediate assignment procedures, per cause

ATINBHDO Attempted outgoing inter BSC Handovers per neighbour cell re-lationship

ATINHIAC Attempted internal Handovers, intracell, per cause

ATINHIRC Attempted internal Handovers, intercell, per cause

ATSDCMBS Attempted SDCCH seizure meeting an SDCCH blocked state

ATTCHSEI Attempted TCH seizures (Fullrate/Halfrate)

BSCPRCLD BSC processor load

BTSEPRLD BTSE processor load

CFERRXQU Correlated FER to RXQUAL measurements

CRXLVQUD Correlated RXLEV to RXQUAL measurements (doenlink)

CRXLVQUU Correlated RXLEV to RXQUAL measurements (uplink)

CRXLVTAD Correlated RXLEV to Time Advance measurements (downlink)

CRXLVTAU Correlated RXLEV to Time Advance measurements (uplink)

DASPUNT Duration of Adjacent Signalling Point (ASP) unavailable condi-tion

DLKSERST Duration of link in-service state

DLKUNCON Duration of the linkset unavailable conditions

DSLUNAV Duration of signalling link unavailability

HOFITABS Total number of Handover failures, intra BSC

IFRMABIS I-frame measurements

ILUPLKIC Interference measurements on idle TCHs

LOCAUTCH Number of locally generated automatic changeovers

MAXBUSDC Maximum number of busy SDCCHs per cell

MBTCHAMR Mean number of busy TCH per channel type

MBUSYSDC Mean number of busy SDCCHs

MDURTCRQ Mean duration a TCH is queued (Fullrate/Halfrate)

MDURTCSD Mean Duration a TCH/SD with TCH_SD_Pool can be used as SDCCH

MEATBFAC Mean number of active TBF per cell

MEBUSTCH Mean number of busy TCHs (Fullrate/Halfrate)

MEITCHIB Mean number of idle TCHs per interference band

MPDTQLEN Mean packet queue length (on PDCH) per cell

MSTHBS Mean signalling data throughput (uplink/downlink) per cell on the BSSGP Layer Gb interface

MSTHRF Mean signalling data throughput (uplink/downlink) per cell on the RF interface

MTCHBUTI Mean TCH busy time (Fullrate/Halfrate)

MTCHQLEN Mean TCH queue length (Fullrate/Halfrate)

MUTHBS Mean user data throughput (uplink/downlink) per cell on the BSSGP Layer Gb interface

MUTHRF Mean user data throughput (uplink/downlink) per cell on the RF Interface

NACSUCPR Number of accesses with a successful result by procedure (PCH, AGCH and RACH)

NASPAVUN Number of transitions of the Adjacent Signalling Point (ASP) from available to unavailable

NASUSDPE Number of successful SDCCH seizures in a period

NATGPPAG Number of GPRS paging procedures


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NATPRRE Number of attempted packet resource reassignment proce-dures per cell

NATTSDPE Number of attempted SDCCH seizures in a period

NAVPDCH Number of available PDCH per cell

NAVSDCCH Number of available SDCCHs

NAVTCH Number of available TCHs (Fullrate/Halfrate)

NAVTCHSD Number of available TCH/SD per Cell

NDESDCCH Number of defined SDCCHs

NDFTCHSD Number of defined TCH/SD

NHOINRHA Number of handover indications not resulting in a handover at-tempt

NINVRACH Number of invalid RACH messages per cause

NMSGDISQ Number of messages discarded from the TCH queue per cell (Fullrate/Halfrate)

NMSUREC Number of Message Signal Units (MSUs) received

NMSUTRAS Number of Message Signal Units (MSUs) transmitted

NNNOTNCH Number of new Notifications to be sent on the Notification Channel (NCH)

NPMSDISQ Number of packet channel assignment attempts discarded from the packet queue per cell

NRDEFTCH Number of defined TCHs (Fullrate/Halfrate)

NRETPDU Number of retransmitted PDUs (uplink/downlink)

NRFLSDCC Number of lost radio links while using an SDCCH

NRFLTCH Number of lost radio links while using a TCH (Fullrate/Halfrate)

NRINHDFL Number of inter BSC Handover failures

NRUNINHD Number of unsuccessful outgoing inter BSC Handovers per neighbour cell relationship

NSUCCHPC Successful immediate assignments of signalling channels per cause

NSUGPPAG Number of successful GPRS paging procedures

NSUPRRE Number of successful packet resource reassignment procedure attempts per cell

NTBFRJC Number of TBF rejections per cell

NTCHSDCM Number of TCH-SDCCH channel modifications

NTDPMAIN Number of transmitted and discarded Paging messages on the air interface (PCH)

NUACATCL Number of packet uplink accesses attempts per cell

PWRUPDW Power and quality measurements on uplink/downlink busy TCHs

RFDBCUN Routing failure, DPC unavailable

RFSUBUN Routing failure, subsystem unavailable

SINHOBSC Successful internal Handovers per cause

SININIRH Successful incoming internal intercell Handovers per originating cell

SINTHINT Successful internal Handovers, intercell, per cause

SINTHITA Successful internal Handovers, intracell, per cause

SISHINTE Successful Internal SDCCH Handovers Intercell

SISHINTR Successful internal SDCCH Handovers Intracell

SLFAILAL Signalling link failure

SOINTESH Successful MSC controlled SDCCH Handovers

SOUINIRH Successful outgoing intercell Handovers per cause, per neigh-bourcell relationship

SUCTCHSE Successful TCH seizures (Fullrate/Halfrate)

SUIMASCA Successful immediate assignment procedures, per cause

SUINBHDO Successful outgoing inter BSC Handovers per neighbour cell re-lationship

SULACCEL Successful packet uplink accesses per cell

TACCBPRO Total number of accesses by procedures (PCH, AGCH)

TANRGPRS Number of attempted GPRS accesses per cell with no GPRS radioresources allocated

TASSATT Total number of assignment attempts per cell per channel type

TASSATVS Total number of assignment attempts relevant to VBS/VGCS Broadcast/Group Channels, per

cell

TASSFAIL Total number of assignment failures per cell, per cause, per channel type

TASSSUCC Total number of successful assignments per cell per channel type

TASSUCVS Total number of successful assignments relevant to VBS/VGCS Broadcast/Group Channels,

per cell

TCMSGREC Total number of connectionless messages received

TCMSGSND Total number of connectionless messages sent

TMSGREC Total number of messages received

TMSHHDL Total number of messages handled

TNMSCNCL Total number of multislot (HSCSD) connections per cell

TNPDTCL Number of GPRS (PDTCH) connections per cell


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TNSUDHSC Number of service upgrades/downgrades for HSCSD calls

TNTCHCL Total number of TCH connections, per cell (Fullrate/Halfrate)

TRANAVTI Transceiver available time

UISHINTE Unsuccessful Internal SDCCH Handovers Intercell

UISHINTR Unsuccessful internal SDCCH Handovers Intracell

UNIHIALC Unsuccessful internal Handover, intracell, with loss of MS

UNIHIRLC Unsuccessful internal Handovers, intercell, with loss of MS

UNINHOIA Unsuccessful internal Handovers, intracell

UNINHOIE Unsuccessful internal HOs, intercell, with reconnection to the old channel, cause, per target

cell

UOINTESH Unsuccessful MSC controlled SDCCH Handovers

04_02_mn1736eu08mn_0001_appendix1_kpi

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