general amr performances monitoring metrics v1.0

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General AMR Performances Monitoring Metrics

Document number: PE/BSS/APP/11696Document issue: 01.00 / ENDocument status: PreliminaryDate: 01/07/2004

External document

Copyright 2000 Nortel Networks, All Rights Reserved

Printed in France

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PE/BSS/APP/11696 01.00 / EN Preliminary 01/07/2004 Page 3/17

PUBLICATION HISTORY

01/July/2004

Issue 01.00/ EN, PreliminaryCreation of the document


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CONTENTS

1. INTRODUCTION .........................................................................................................................5

1.1. OBJECT .................................................................................................................................5

1.2. SCOPE OF THIS DOCUMENT .....................................................................................................5

1.3. AUDIENCE FOR THIS DOCUMENT ..............................................................................................5

2. RELATED DOCUMENTS............................................................................................................6

2.1. APPLICABLE DOCUMENTS........................................................................................................6

2.2. REFERENCE DOCUMENTS........................................................................................................6

3. AMR MONITORING (V14.3)........................................................................................................7

3.1. GLOBAL PERFORMANCE .........................................................................................................7

3.1.1 Traffic............................................................................................................................73.1.2 Global blocking Evolution..............................................................................................83.1.3 Call drop ratio ...............................................................................................................93.1.4 Handover ....................................................................................................................103.1.5 QOS subcriber............................................................................................................11

3.2. AMR INNER PERFORMANCES ................................................................................................12

3.2.1 Codec mode usage.....................................................................................................123.2.2 Frame erasure rate .....................................................................................................133.2.3 Power control efficiency..............................................................................................14

3.3. L1MPERFORMANCES...........................................................................................................14

3.3.1 Radio Quality ..............................................................................................................143.3.2 Radio Level.................................................................................................................15

4. ABBREVIATIONS AND DEFINITIONS.....................................................................................16

4.1. ABBREVIATIONS ...................................................................................................................16

4.2. DEFINITIONS.........................................................................................................................17


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1. INTRODUCTION

1.1. OBJECT

The aim of this document is to define some performances monitoring metrics for the

Nortel BSS AMR Feature, in order to:

Monitor efficiently the live network performances evolution related to that

feature services.

Detect the performances issues for these specific features

Optimize the feature efficiency thanks to parameter fine tuning

1.2. SCOPE OF THIS DOCUMENT

This document is applying to the V14.3 AMR BSS feature implying new monitoringcounters.

For more details concerning the GSM procedures & protocols, refer to ETSI GSM

Specifications (see [R1]).

1.3. AUDIENCE FOR THIS DOCUMENT

This document is intended for all engineers related to Network performances

monitoring.


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2. RELATED DOCUMENTS

2.1. APPLICABLE DOCUMENTS

[A1] PE/SYS/DD/0343 SV713: AMR Full Rate; SV885: AMR Half Rate

[A2] PE/SYS/DD/0371 CT7100 metrics

[A3] PE/BSS/DD/0018 BSS System Functional Specification Observation

[A4] PE/DCL/DD/0036 BSS Parameters User Guide

[A5] PE/BSS/APP/11438 V14.3.1 AMR Activation Guideline

2.2. REFERENCE DOCUMENTS

[R1] 04.08 Mobile radio interface layer 3 specification


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TCH Traffic Carried = tchFrAveragedUsedOverflowAllocationMoy + tchFrAveragedUsedPrimoAllocationMoy

+ tchFrAveragedUsedTchAllocationMoy + tchHrAveragedUsedOverflowAllocationMoy

+ tchHrAveragedUsedPrimoAllocationMoy + tchHrAveragedUsedTchAllocationMoy

TCH EFR Traffic Carried = tchFrAveragedUsedOverflowAllocationMoy

+ tchFrAveragedUsedPrimoAllocationMoy + tchFrAveragedUsedTchAllocationMoy

amrFrTchStdAveragedUsedMoy

TCH AMR Traffic Carried = tchHrAveragedUsedOverflowAllocationMoy+ tchHrAveragedUsedPrimoAllocationMoy + tchHrAveragedUsedTchAllocationMoy

+ amrFrTchStdAveragedUsedMoy

AMR Traffic Ratio =

TCH AMR Traffic Carried

TCH Traffic Carried

3. AMR MONITORING (V14.3)

In the following section, a set of AMR performances monitoring metrics is proposed,

based on existing counters and also new counters introduced with the AMR feature.As the main objective of this feature is to:

Increase the capacity (i.e. HR benefit, spectral efficiency gain),

Improve the Voice Quality in degraded radio conditions (i.e. interferences

resistant),

We will monitor the impacts by using the following metrics.

3.1. GLOBAL PERFORMANCE

3.1.1 TRAFFIC

The following metrics provide the global traffic carried in Erlangs, obtained by

summing both TCH full rate (AMR FR and standard FR calls) and AMR half rate

traffic, on a per cell basis:

The global TCH traffic carried in the cell is (in Erlangs)

TheTCH AMR Traffic Carried in the cell is (in Erlangs)

The Ehanced Full-Rate (FR/EFR) traffic carried in the cell is (in Erlangs)

We calculate the AMR traffic ratio compared to the global traffic carried on the cell:


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TCH Blocking Rate System =TCH Allocation Lack System

TCH Allocation Attempts System

TCH Allocation Lack System = signallingReleaseBtsT11 + tchHrRessourceFailure + tchFrRessourceFailure

TCH Allocation Attempts System = signallingReleaseBtsT11 + tchHrRessourceFailure + tchFrRessourceFailure

+ tchHrAllocated + tchFrAllocated

TCH Blocking Rate Users = TCH Allocation Lack UsersTCH Allocation Attempts Users

TCH Allocation Lack Users = signallingReleaseBtsT11 + tchFrRessourceFailure + tchHrRessourceFailure -

amrFrToHrHoRequestIntraCellTch + amrFrToHrHoExecutionIntraCellTch - amrHrToFrHoRequestIntraCellTch +

amrHrToFrHoExecutionIntracellTch

TCH Allocation Attempts Users = signallingReleaseBtsT11+ tchFrRessourceFailure + tchHrRessourceFailure -amrFrToHrHoRequestIntraCellTch + amrFrToHrHoExecutionIntraCellTch + tchFrAllocated + tchHrAllocated

amrHrToFrHoRequestIntraCellTch + amrHrToFrHoExecutionIntracellTch

AMR HR Penetration =TCH AMR HR Traffic carried

TCH Traffic carried

TCH AMR HR Traffic Carried = tchHrAveragedUsedOverflowAllocationMoy

+ tchHrAveragedUsedPrimoAllocationMoy + tchHrAveragedUsedTchAllocationMoy

SDCCH Blocking Rate =[SDCCH Allocation failure]

[SDCCH Allocation failure]+[SDCCH Allocated]+[TCH FR Overflow Allocated]

SDCCH Allocation Failure = sdcchRessourceFailure

SDCCH Allocated = sdcchAllocated

TCH FR Overflow Allocated = tchFrAllocatedOverflowAllocated

We calculate the AMR HR Penetration comparing the AMR HR Traffic carried over the

TCH Traffic carried:

with:

3.1.2 GLOBAL BLOCKING EVOLUTION

The SDCCH blocking rate should be closely monitored if no SDCCH resource is

added after AMR implementation since the cell might carry more traffic.

with:

NB: An AMR HR TCH cannot be used for overflow (signaling).

We should also monitor the TCH blocking rate evolution, as it should be improved

according to the capacity increase, and it can be calculated from a system or a users

point of view:

with:

with:


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Call Drop Ratio Network =trafficAbnormalRelease

[TCH Communications Network]

TCH Communications Network = amrHrTchSuccessfullyAssigned + successfulTchFrSeizures hoSuccessIntraBts

- hoSuccessTieringTchLargeToSmallPattern - hoSuccessTieringTchSmallToLargePattern

Call Drop Ratio Cell =trafficAbnormalRelease

[TCH Communications Cell]

TCH Communications Cell = (successfulTchFrSeizures + amrHrTchSuccessfullyAssigned)

(hoSuccessIntraBts + hoSuccessTieringTchLargeToSmallPattern + hoSuccessTieringTchSmallToLargePattern )

+ hoSuccessIncomingInterBss + hoSuccessIncomingIntraBss

3.1.3 CALL DROP RATIO

We should monitor the ratio of call drops at a network or a cell level, but exclusively

from a global point of view, i.e. without spreading the metrics into a AMR HR / AMR

FR / standard FR call drop ratio:

NB: we remove all the intra-cell TCH communications (due to Tiering, Quality & AMR

intracell Handovers) for the network & cell overview.

The call drop at the network level is given by

We need to use the number of TCH communications at the network level

The call drop at cell level is given by

We need to use the number of TCH communications at the cell level

We may also need to evaluate the contribution of the main causes of dropped calls:

Release Ind Contribution =trafficReleaseReleaseInd


RLT Contribution =trafficReleaseCnxFailRadioIntFail + trafficReleaseCnxFailRadioLinkFail


T200 Contribution =trafficReleaseErrorIndDm + trafficReleaseErrorIndSeq + trafficReleaseErrorIndT200


T3103 Contribution =trafficReleaseT3103


T3107 Contribution =trafficReleaseT3107CircDown



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AMR Intra HO HRtoFR Exe Fail Ratio =amrHrToFrHoExecutionIntraCellTch amrHrToFrHoSuccessIntraCellTch

amrHrToFrHoExecutionIntraCellTch

AMR Intra HO FRtoHR Exe Fail Ratio =amrFrToHrHoExecutionIntraCellTch amrFrToHrHoSuccessIntraCellTch

amrFrToHrHoExecutionIntraCellTch

AMR Inter HO FR T3103 Exe Fail Ratio =hoNCellsUnsuccessTchAmrFrTimerExpiration

hoNCellsExecutionTchAmrFr

AMR Inter HO FR ROC Exe Fail Ratio =hoNCellsUnsuccessTchAmrFrHandoverFailure


AMR Inter HO FR Others Exe Fail Ratio =hoNCellsUnsuccessTchAmrFrClearCommand


AMR Inter HO HR T3103 Exe Fail Ratio =hoNCellsUnsuccessTchAmrHrTimerExpiration

hoNCellsExecutionTchAmrHr

AMR Inter HO HR ROC Exe Fail Ratio =hoNCellsUnsuccessTchAmrHrHandoverFailure

hoNCellsExecutionTchAmrHr

AMR Inter HO HR Others Exe Fail Ratio = hoNCellsUnsuccessTchAmrHrClearCommandhoNCellsExecutionTchAmrHr

3.1.4 HANDOVER

With the introduction of the AMR feature new Intracell Handovers are performed when

Half Rate is activated. Those Intracell Handovers can either be for a capacity reason

(FR to HR) or a quality reason (HR to FR)

We can monitor the Execution Failure Ratio for each of these two causes:

It could also be interesting to supervise the evolution of Intercell Handovers Execution

Failure Ratio. In case of an Intercell Handover four possibilities can occur: the

handover is completed, the handover drop after a timer expiration, the handover fail

and return to the old channel, or the handover is not successful for an other reason.

NB: the hoNCellsxx counters are defined at a neighbouring level and are meaningful

only on a per relation basis


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QoS Subscriber = 100-(50*[Call Drop Ratio Cell]+10*[Call Establishment Failure ratio]+10*[SDCCH BlockingRate]+10*[TCH Blocking rate (users)]+20*[Incoming HO Exe Fail ratio])

Call Establishment Failure Ratio =[Assign Fail]-[HO Intracell Exe Fail]+[Signalling Abnormal Release]

[Estab Indic All]

Assign Fail = (attemptedTchFrSeizures + amrHrTchSuccessfullyAssigned + amrHrTCHAssignFailure)

- (successfulTchFrSeizures + amrHrTchSuccessfullyAssigned)

HO Intracell Exe Fail = (hoExecutionIntraBts + hoRequiredTchTieringLargeToSmallPattern -oFailureTieringTchNorrLargeToSmallPattern + hoRequiredTchTieringSmallToLargePattern -

oFailureTieringTchNorrSmallToLargePattern) - (hoSuccessIntraBts + hoSuccessTieringTchLargeToSmallPattern +oSuccessTieringTchSmallToLargePattern)

Signalling Abnormal Release = signallingAbnormalReleaseCell - signallingReleaseBtsT3107CircDown

Estab Indic All = estabIndicSignallingPagingRes + estabIndicSignallingLocUpdate + estabIndicSignallingReEstab +

estabIndicSignallingImsiDetach + estabIndicSignallingMoc + estabIndicSignallingEmergency

+ estabIndicSignallingShortMsg + estabIndicSignallingSuppService

Incoming HO Failure Ratio = [Incoming HO Cmd]-[Incoming HO Cmp][Incoming HO Cmd]

Incoming HO Cmd = hoExecutionIncomingInterBss + hoExecutionIncomingIntraBss

Incoming HO Cmp = hoSuccessIncomingInterBss + hoSuccessIncomingIntraBss

3.1.5 QOS SUBCRIBER

We compute the Network subscriber QOS according to the following formula (with

updated metrics):

Metric Update:

Call Establishment Failures Ratio:

Incoming HO Failure Ratio:


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Codec 4.75 DL FR Usage Ratio =amrFrDownlinkCodec475

amrFrDownlinkCodec475 + amrFrDownlinkCodec59 + amrFrDownlinkCodec67 + amrFrDownlinkCodec102







Codec 4.75 UL FR Usage Ratio =amrFrUplinkCodec475

amrFrUplinkCodec475 + amrFrUplinkCodec59 + amrFrUplinkCodec67 + amrFrUplinkCodec102







3.2. AMR INNER PERFORMANCES

3.2.1 CODEC MODE USAGE

The codec mode usage will enable to monitor the distribution of AMR codec mode foreach AMR channel uplink and downlink:

CODEC MODE USAGE AMR DOWNLINK FR

CODEC MODE USAGE AMR UPLINK FR


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Codec 4.75 DL HR Usage Ratio =amrHrDownlinkCodec475

amrHrDownlinkCodec475 + amrHrDownlinkCodec59 + amrHrDownlinkCodec67

Codec 5.9 DL HR Usage Ratio =

amrHrDownlinkCodec59


Codec 6.7 DL HR Usage Ratio =amrHrDownlinkCodec67


Codec 4.75 UL HR Usage Ratio =amrHrUplinkCodec475

amrHrUplinkCodec475 + amrHrUplinkCodec59 + amrHrUplinkCodec67





AMR FER FR UL =AMR FR Bad Speech Frames Codec

AMR FR Valid Speech Frames Codec

AMR FR Bad Speech Frames Codec = amrFrBadSpeechFramesCodec475 + amrFrBadSpeechFramesCodec59

+ amrFrBadSpeechFramesCodec67 + amrFrBadSpeechFramesCodec102

AMR FR Valid Speech Frames Codec = amrFrValidSpeechFramesCodec475 + amrFrValidSpeechFramesCodec59+ amrFrValidSpeechFramesCodec67 + amrFrValidSpeechFramesCodec102

AMR FER HR UL =AMR HR Bad Speech Frames Codec

AMR HR Valid Speech Frames Codec

AMR HR Bad Speech Frames Codec = amrHrBadSpeechFramesCodec475

+ amrHrBadSpeechFramesCodec59 + amrHrBadSpeechFramesCodec67

AMR HR Valid Speech Frames Codec = amrHrValidSpeechFramesCodec475

+ amrHrValidSpeechFramesCodec59 + amrHrValidSpeechFramesCodec67

CODEC MODE USAGE AMR DOWNLINK HR

CODEC MODE USAGE AMR UPLINK HR

3.2.2 FRAME ERASURE RATE

For each codec mode and for each channel used, the Uplink FER can be computed

so as to determine the Voice Quality:

AMR FR UL FER

AMR HR UL FER


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AMR %Time Full Power FR DL =downlinkPowerCtrlMaxTchAmrFrMoy

amrFrTchConnectionDurationMoy

AMR %Time Full Power FR UL =uplinkPowerCtrlMaxTchAmrFrMoy

amrFrTchConnectionDurationMoy

AMR %Time Full Power HR DL =downlinkPowerCtrlMaxTchAmrHrMoy

amrHrTchConnectionDurationMoy

AMR %Time Full Power HR UL =uplinkPowerCtrlMaxTchAmrHrMoy

amrHrTchConnectionDurationMoy

Nb Measurement Reports SDCCH =

connectionDurationSdcchMoy * sdcchAllocated

470

Nb Measurement Reports TCH UL =

connectionDurationTchMoy * TCH Allocation FR

480

+

amrFrTchConnectionDurationTchMoy * TCH Allocation AMR FR

480

+ amrHrTchConnectionDurationTchMoy * TCH Allocation AMR HR

480

TCH Allocation FR = tchFrAllocatedOverflowAllocation + tchFrAllocatedTchAllocation

+ tchFrAllocatedPrimoAllocation - amrFrTchAllocated

TCH Allocation AMR FR = amrFrTchAllocated

TCH Allocation AMR HR = tchHrAllocated

3.2.3 POWER CONTROL EFFICIENCY

The percentage of the time that the cell is emitting at the full power is a good indicator

to evaluate the efficiency of the power control..

The higher the value, the worst the power control efficiency.

3.3. L1M PERFORMANCES

For the L1M performances monitoring, as it is quite difficult to sort AMR phases fromnon-AMR phases, it is recommended to evaluate the radio quality, the level,and theC/I by and large.

3.3.1 RADIO QUALITY

An estimate of the radio quality of the network can be done with counters concerning

cell average quality for both UL & DL paths (L1M measurement reports). Results are

to be divided vy 10000 to get BER, then RxQual has to be calculated from the

BER as described in GSM Rec 05.08

This metric can also be used to sort out the worst quality cells on the network.

We first need to compute the number of measurement report (SDCCH, TCH EFR,

TCH AMR FR, TCH AMR HR)


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RxQual DL =rxQualDownLink + RxQualDownlinkAmrFr + RxQualDownlinkAmrHr

Nb Measurement Reports SDCCH + Nb Measurement Reports TCH DL

RxQual UL =rxQualUpLink + RxQualUplinkAmrFr + RxQualUplinkAmrHr

Nb Measurement Reports SDCCH + Nb Measurement Reports TCH UL

RxLev DL =rxLevDownLink + RxLevDownlinkAmrFr + RxLevDownlinkAmrHr

Nb Measurement Reports SDCCH + Nb Measurement Reports TCH DL

RxLev UL =rxLevUpLink + RxLevUplinkAmrFr + RxLevUplinkAmrHr

Nb Measurement Reports SDCCH + Nb Measurement Reports TCH UL

C/I UL =2*CIUplinkFr + CIUplinkAmrFr + CIUplinkAmrHr

2*(Nb Measurement Reports SDCCH + Nb Measurement Reports TCH UL)

DOWNLINK RADIO QUALITY

UPLINK RADIO QUALITY

3.3.2 RADIO LEVEL

A metric estimating the level on the network can be done with counters concerning cell

average level for both UL & DL paths (L1M measurement reports). Results are

provided in dB [0 63].

This metric can also be used to sort out the worst level cells on the network.

DOWNLINK RADIO LEVEL

UPLINK RADIO LEVEL

C/I UPLINK

We can monitor the uplink C/I according to the following metrics.

Results are provided in dB.

Note: a factor of 2 is introduced because the AMR C/I countervalues are given in

dB.


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4. ABBREVIATIONS AND DEFINITIONS

4.1. ABBREVIATIONS

ACS Adaptive multirate Codec mode Set

AMR Adaptative Multi-Rate

BFI Bad Frame Indicator

BFI KO Bad Frame Indicator KO

C/I Carrier over Interferer

CMC Codec Mode Command

CMI Codec Mode Indication

CMR Codec Mode Request

DCU2 Data Channel Unit 2

EFR Enhanced Full Rate vocoder

Erl Erlang

FER Frame Erasure rate

FR Full Rate

FR AMR Full Rate AMR

HR Half Rate

HR AMR Half Rate AMR

ICM Initial Codec Mode

L1m Layer one Management

OMU Operation and Maintenance Unit

PWCI Potential Worst C/I

RATSCCH Robust AMR Traffic Synchronized Control Channel

RFU Reserved for Future Used

SBC Single Board Computer

SNR Signal to Noise ratio

TCB TransCoder Board

TRAU Transcoding and Rate Adaptor Unit

TMG Traffic ManaGement

TMU Traffic Management Unit

VAD Voice Activity Detection

VAF Voice Activity Factor


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PE/BSS/APP/11696 01 00 / EN P li i 01/07/2004 P 17/17

4.2. DEFINITIONS

Busy Hour: in a day, it represents the hour for which network load reaches its

maximum value.

Blocking rate: Allocation failure ratio due to a lack of resources in the cell and a lack

of free entries in the queue (for TCH).

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general amr performances monitoring metrics v1.0

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