module 4-lte kpi introduction

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HuaweieRAN KPI introduction (eRAN 6.0)


Contents

1. KPI System Overview

2. KPI Detail Description

3. Recommended KPIs


1. KPI System Overview


KPI System Overview

Radio Network KPI : Focus on the radio network performance

Service KPI : Focus on the user experienceLTE KPIs

Accessability Retainability IntegrityMobility Latency

RRC SETUP SR

ERAB Setup SR (VoIP/ALL)

Call Setup SR (VoIP/ALL)

Call Drop Rate (VoIP/ALL)

Call Setup Complete Rate (VoIP/ALL)

Service UL/DL Throughput

HHO SR ( Intra/Inter Frequency)

HO in SR

Inter-RAT HHO SR

Access Latency

Service Latency

Interrupt Latency

Radio Network Unavailability Rate

Availability

Cell UL/DL Traffic Volume

Radio Bearer Number

Utilization

UL/DL RB Utility Rate

Traffic


KPI Attained Approach

o In general, there are two approaches to define/attain KPIs:

By statistics /Counter:

Most of KPIs are attained by this approach, such as RRC Success Rate, HHO

Success Rate

By drive test / Stationary test:

Some KPIs should be attained by drive test, such as Attach Latency, Handover

latency


Measurement Object for Counter

Measurement Object

Measurement

Unit 1

Measurement

Unit 2

Counter 1 Counter 2 Counter 3 Counter 4 Counter 5 Counter 6 Counter 7

Measurement

Family 1

Measurement

Family 2

o Each measurement result is related to a specific measurement object.

o Counters are organized by Measurement Unit/Family.


o Collection methods (TS 32.403)

CC (Cumulative Counter), for example, Attempted RRC connection establishments;

GAUGE (dynamic variable), used when data being measured can vary up or down

during the period of measurement, for example, Maximum E-RAB Setup time;

DER (Discrete Event Registration), when data related to a particular event are

captured every nth event is registered, where n can be 1 or larger, for example,

Cell Unavailable Time, Mean E-RAB Setup time;

SI (Status Inspection), for example, Average Number of simultaneous E-RABs;

o Reporting period

The measurement results are collected in a pre-defined reporting period, and this

reporting period, in general, is configurable at EMS, for example, 15mins,

60mins

Collection Method and Reporting Period


2. KPI Detail Description


KPI Detail Description

o Accessibility

o Retainability

o Mobility

o Availability

o Utilization

o Traffic

o Integrity

o Latency


Accessibility (1) RRC Setup Success Rate

o RRC Setup Success Rate (service)

The RRC setup procedure is trigged by different reasons as identified by the establishmentCause field in the RRCConnctionRequest message: emergency, highPriorityAccess, mt-Access, mo-Signaling, mo-Data, delayTolerantAccess-v1020.The UE sets the establishmentCause and received by eNodeB. Causes except mo-Signaling are categorized as service related ones, and the cause of mo-Signaling is categorized as signal related ones. This KPI evaluates the RRC setup success rate with service related causes in a cell or cluster.

%100_

__ Service

service

service

AttemptConnectionRRC

SuccessConnectionRRCSSRRRC

o RRC Setup Success Rate (Signal) This KPI evaluates the RRC setup success rate with signal related causes (mo-Signalling) in a cell or cluster.

%100_

__ Signal

Signal

Signal

AttemptConnectionRRC

SuccessConnectionRRCSSRRRC


Accessibility (2) Counter Mapping for RRC SSR

L.RRC.ConnReq.Att

L.RRC.ConnReq.Succ


Accessibility (3) QCI Definition

o LTE-SAE QoS Class Identifier

There are 9 QCIs defined in 3GPP TS 23.203. Each of QCI has its QoS

requirements, and each E-RAB will has the attribute of QCI.


Accessibility (4) ERAB Setup Success Rate

o VoIP ERAB Setup Success RateThis KPI can be used to evaluate the ERAB setup success rate of VoIP service (QCI 1 service) in a cell or cluster.

_ __ _ 100%

_ _

VoIP ERAB SetupSuccessVoIP ERAB SSR

VoIP ERAB SetupAttempt

o ERAB Setup Success Rate (All)This KPI can be used to evaluate the ERAB setup success rate of all services including the VoIP service in a cell or a cluster.

__ ( ) 100%

_

ERAB SetupSuccessERAB SSR ALL

ERAB SetupAttempt


Accessibility (5) Counter Mapping for ERAB SSR

ERAB Setup Attempt Counters

ERAB Setup Success Counters

ERAB Setup Attempt Counters

ERAB Setup Success Counters


Accessibility (6) Call Setup Success Rate

o VoIP Call Setup Success Rate (VoIP CSSR)

This KPI evaluates the success rate of the whole setup procedure for VoIP service (QCI

1 service) in a cell or cluster, which mainly includes three phases : RRC setup phase, S1

Signaling connection establishment phase and VoIP E-RAB setup phase:

_ 1 _ __ * * 100%

_ 1 _ _

Service

Service

RRC ConnectionSuccess S SIGConnectionEstablishSuccess VoIP ERAB SetupSuccessVoIP CSSR

RRC ConnectionAttempt S SIGConnectionEstablishAttempt VoIP ERAB SetupAttempt

o Call Setup Success Rate (ALL)

This KPI can be used to evaluate the call setup success rate of all services including

the VoIP service in a cell or a cluster. This KPI mainly includes three phases : RRC

setup phase, S1 Signaling connection establishment phase and service E-RAB setup

phase:_ 1 _

( ) * * 100%_ 1 _

Service

Service

RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccessCSSR ALL

RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt


Accessibility (7) Counter Mapping for CSSR


Retainability (1) Call Drop Rate

o VoIP Call Drop Rate

This KPI can be used to evaluate the call drop rate of VoIP service (QCI 1 service) in a cell

or cluster, the call drops happen when eNode initiate active ERAB (with data in buffer)

release process by E-RAB Release Indication or UE Context Release Request message with

Cause field with abnormal reasons (the cause other than : Normal Release, Detach,User

Inactivity, cs fallback triggered, UE Not Available For PS Service,or Inter-RAT redirection),

and all of the other E-RAB releases are consider as normal E-RAB release.

%100Re__

Re___

leaseERABVoIP

leaseAbnormalERABVoIPCDRVoIP


Retainability (1) Call Drop Rate

o Call Drop Rate(ALL)

This KPI can be used to evaluate the call drop rate of all services in a cell or a cluster,

including VoIP service.

_ Re( ) 100%

_ Re

ERAB Abnormal leaseCDR ALL

ERAB lease

o Call Drop Rate(Always Online)

This KPI can be used to evaluate the call drop rate of all the services, including the VoIP

services, when the always online state is active. In always online state, the E-RAB

number of UE entering the un-synchronous state from synchronous state will be

considered for the KPI calculating.

_ 100%Re

ERABAbnormalReleaseOfAlwaysOnlineAlwaysOnline CDR

ERAB leaseOfAlwaysOnline


Retainability (2) Counter Mapping for Call Drop Rate

Normal and Abnormal release Counters based on

the cause

Normal and Abnormal release Counters based on

the cause


Retainability (3) - Call Setup Complete Rate

_ 1 _ _ Re( ) * * * 100%

_ 1 _ _ Re

Service

Service

RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccess ERAB Normal leaseCSTR ALL

RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt ERAB lease

o VoIP Call Setup Complete Rate (VoIP CSTR)

This KPI evaluates the call Setup Complete Rate for VoIP service (QCI 1 service) in a cell

or cluster, which means the rate of the VoIP service can be normally terminated once

user do the attempt to setup the service. And it can include 4 phases: RRC setup phase,

S1 Signaling connection establishment phase, VoIP E-RAB setup phase and VoIP service

E-RAB release phase;

o Call Setup Complete Rate (ALL)

The similar as upper KPI, this KPI will evaluate the success rate in totally for 4 phases:

RRC setup phase, S1 Signaling connection establishment phase, service E-RAB setup

phase and service E-RAB release phase;

_ 1 _ _ _ _ Re_ * * *

_ 1 _ _

Service

Service

RRC ConnectionSuccess S SIGConnectionEstablishSuccess VoIP ERAB SetupSuccess VoIP ERAB Normal leaseVoIP CSTR

RRC ConnectionAttempt S SIGConnectionEstablishAttempt VoIP ERAB SetupAttempt Vo 100%

_ _ ReIP ERAB lease


Retainability (3) - Call Setup Complete Rate

o Call Setup Complete Rate (Always Online)

The similar as upper KPI, this KPI will evaluate the success rate in totally for 4

phases: RRC setup phase, S1 Signaling connection establishment phase,

service E-RAB setup phase and service E-RAB release phase (when the always

online state is active);

_ 1 _( ) * * *

_ 1 _

Service

Service

RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccess ERABAbnormalReleaseOfAlwayCSTR AlwaysOnline

RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt 100%

Re

sOnline

ERAB leaseOfAlwaysOnline


Retainability (4) - Counter Mapping for CSCR


Mobility (1) Intra-LTE Handover (Out) Success Rate

o Intra-frequency Handover Out Success RateThis KPI can be used to evaluate the intra-frequency handover out success rate in a cell or cluster.

%100_

___

ptHOOutAttemIntraF

ssHOOutSucceIntraFSRHOOutIntraF

o Inter-frequency Handover Out Success RateThis KPI can be used to evaluate the inter-frequency handover out success rate in a cell or cluster.

%100_

___

ptHOOutAttemInterF

ssHOOutSucceInterFSRHOOutInterF


Mobility (2) Counter Mapping for Intra-LTE HO SR

Handover Attempt Counters

Handover Success Counters


Mobility (3) - Intra-LTE Handover In Success Rate

o Handover In Success RateThis KPI can be used to evaluate the handover in success rate in a cell or cluster.

%100_ tHOInAttemp

sHOInSuccesSRHOIn


Mobility (4) - Counter Mapping for Intra-LTE HO In SR

HO in Attempt Counters

HO in Success Counters


Mobility (5) Inter-RAT Handover Success Rate

o Inter-RAT Handover Success Rate (LTE to WCDMA)This KPI can be used to evaluate the inter-RAT handover success rate from LTE to WCDMA in a cluster.

%100_2_

_2__2_

AttemptOutWLIRATHO

SuccessOutWLIRATHOSRWLIRATHO out

o Inter-RAT Handover Success Rate (LTE to GERAN)This KPI can be used to evaluate the inter-RAT handover success rate from LTE to GERAN in a cluster.

%100_2_

_2__2_

AttemptOutGLIRATHO

SuccessOutGLIRATHOSRGLIRATHO out


Mobility (6) Inter-RAT Handover Success Rate

o Inter-RAT Handover Success Rate (LTE to CDMA2000)This KPI can be used to evaluate the inter-RAT handover success rate from LTE to CDMA2000 in a cluster.

_ 2 __ 2 _ 100%

_ 2 _out

IRATHO L C SuccessOutIRATHO L C SR

IRATHO L C AttemptOut


Mobility (7) Counter Mapping for Inter-RAT HO SR

B point , HO attempt, and distinguish the target system by an element targetRAT-Type in

the message

C point, HO Success


Availability (1) - Radio Network Unavailability Rate

o Radio Network Unavailability Rate

This KPI provides the percentage of time that a cell is unavailable in order to evaluate

the degradation of the network performance caused by the unavailable cells. It is

calculated based on the time of all cell unavailability in the radio network (cluster).

Where the {SP} denotes the reports period of counters, and the unit is minutes.


Availability (2) Counter Mapping for RAN Unavailability Rate


Utilization (1) DL/UL RB Utility Rate

o Uplink Resource Block Utility Rate

This KPI evaluates the UL RB (Resource Block) utility rate of a cell or cluster.

%100_

__

AvailableULRB

UsedULRBeUtilityRatULRB

The ULRB_Available and DLRB_Available are fix values, which can be calculated by system bandwidth.

o Downlink Resource Block Utility Rate

This KPI evaluates the DL RB (Resource Block) utility rate of a cell or cluster.

%100_

__

AvailableDLRB

UsedDLRBeUtilityRatDLRB


Utilization (2) Counter Mapping for RB Utility Rate


Utilization (3) Average CPU Load

o Average CPU Load

This KPI is used to evaluate the CPU usage in busy hours. It indicates the system

loading. The CPU load is calculated by averaging the CPU usage ratio in the

measurement period.

MeanCPUUtility


Utilization (4) Counter Mapping for Average CPU Load


Traffic (1) Active Users

_AvgUserNumber ULData

o Active Users

This group of KPIs consist of 6 KPIs, which are used to evaluate the user numbers which

has the RRC connection in the cell, the user numbers with uplink data in the buffer or

with downlink data in the buffer, and also give the average user number and maximum

user number in a cell or cluster.

_AvgUserNumber DLData

_MaxUserNumber DLData

_MaxUserNumber ULData

AvgUserNumber

MaxUserNumber


Traffic (2) Counter Mapping for Active Users


Traffic (5) Radio Bearers

o Radio Bearers

The radio bearers KPIs consist of ten sub-KPIs, one is for the total of radio bearers and

the other nine are for nine QCIs. This set of KPIs can be used to evaluate the average

radio bearers in a cell or a cluster. The radio bearer for each QCI is based on the number

of active RRC connections for each QCI according to the QCI defined in the QoS

information.

9__QCIrsRadioBeare

1__QCIrsRadioBeare

RadioBearers


Traffic (6) Counter Mapping for Radio Bearers


Traffic (7) - Traffic Volume

o Downlink Traffic Volume

Similar to the radio bearers KPIs, the downlink traffic volume KPIs consist of ten sub-

KPIs, one is for the total of traffic volume for DRBs and the other nine are for nine QCIs.

This group of KPIs can be used to evaluate the DL traffic volume in a cell, which is

measured at the PDCP layer excluding the PDCP header

9__QCIolumeDLTrafficV_ _1DLTrafficVolume QCI

o Uplink Traffic Volume

Similar to the downlink traffic volume KPIs, the uplink traffic volume KPIs consist of ten

sub-KPIs, one is for the total of traffic volume for DRBs and the other nine are for nine

QCIs. This group of KPIs can be used to evaluate the uplink traffic volume in a cell. The

KPIs are measured at the PDCP layer excluding the PDCP header.

1__QCIolumeULTrafficV 9__QCIolumeULTrafficV

DLTrafficVolume

ULTrafficVolume


Traffic (8) - Counter Mapping for Traffic Volume


Traffic (9) - Counter Mapping for Traffic Volume


Service Integrity (1) Service Average Throughput

o Service Downlink Average Throughput

This KPI consist of nine sub-KPIs mapped into nine QCIs (QCI 1~9), they evaluate the downlink throughput of a service with a specific QCI per user in each cell, it reflects the end-user experience.

o Service Uplink Average Throughput

Same with the service downlink average throughput, this set of KPIs consist of nine

sub-KPIs mapped into nine QCIs (QCI 1~9), and the meaning is also similar with it.

1__QCIhroughputULAverageT

9__QCIhroughputULAverageT

1__QCIhroughputDLAverageT

9__QCIhroughputDLAverageT

The total downlink traffic volume at PDCP layer of each QCI and total duration for transmitting them are measured within a measurement period. Then the average throughput of each QCI is obtained at the end of the measurement period.


Service Integrity (2) Cell Average Throughput

o Cell Downlink Average Throughput

This KPI evaluates the cell downlink average throughput when there are data transferring

at downlink. It reflects the cell capacity.

The total downlink traffic volume at PDCP layer of cell and total duration for transmitting

which is measured within a measurement period. Then the average throughput of cell is

obtained at the end of the measurement period.

o Cell Uplink Average Throughput

Same with the cell downlink average throughput, this set of KPI reflects the cell

capacity, and the meaning is also similar with it.

CellDLTrafficVolumeCellDLAveThp

CellDLTransferTime

CellULTrafficVolumeCellULAveThp

CellULTransferTime


Service Integrity (3) Cell Maximum Throughput

o Cell Downlink Maximum Throughput

This KPI evaluates the cell downlink maximum throughput when there are data

transferring at downlink. It reflects the cell capacity. It is calculated based on maximum

value of downlink traffic volume which are transferred at each second.

o Cell Uplink Maximum Throughput

Same with the cell downlink maximum throughput. It is calculated based on maximum

value of downlink traffic volume which are transferred at each second.

1 ( )

1000( )

CellULMaxTrafficVolumeforEach s bitCellULMaxThp

ms

1 ( )

1000( )

CellDLMaxTrafficVolumeforEach s bitCellDLMaxThp

ms


Service Integrity (4) Counter Mapping for

Service Average Throughput


Service Integrity (5) Measurement Principle for

Throughput

Refer to TS 32.450


Service Integrity (6) Counter Mapping for

Service Average Throughput


Service Integrity (7) Counter Mapping for Cell

Average Throughput


Service Integrity (8) Counter Mapping for Cell

Maximum Throughput


Latency (1)

o Access Latency

This grouped KPI can be used to evaluate the

latency of access phase.

o AccessLatency_Attach

Defined as the duration from the time the UE

send AttachRequest message to the time the

UE send AttachComplete message message

o AccessLatency_Idle2Active

Defined as the duration from (UE in idle mode)

the time the UE send RRCConnectionRequest

message to the time the UE send

RRCConnectionReconfiguration message


Latency (2)

o Control Plane HO Interrupt LatencyThis grouped KPI can be used to evaluate the control plane interrupt latency during the handover, we can further distinguish them by different handover scenarios.

This KPIs is measured through drive test. Defined as the duration from the time the UE receives the handover commandRRCConnectionReconfiguration after MeasurementReport) to the time the UE send the handover confirm message (RRCConectionReconfigurationComplete) .

HOIntraLTEInterruptneControlPla ___

CLIRATHOInterruptneControlPla 2___

WLIRATHOInterruptneControlPla 2___

GLIRATHOInterruptneControlPla 2___

o Service LatencyThis grouped KPI can be used to evaluate the latency of a particular service, we can distinguish them by different services, this KPI will be attained by drive test (or stationary test).

bytesPingencyServiceLat 32__

bytesPingencyServiceLat 1460__


Latency (3)

o User Plane HO Interrupt Latency

This grouped KPI can be used to evaluate the

user plane interrupt latency during the

handover, we can further distinguish them by

different handover scenarios.

The user plane interrupt latency is different

when observed at different layers, for example,

at IP layer or RLC layer or MAC layer.

This KPIs is measured through drive test.

Defined as the duration from the last RLC layer

package received before the handover, to the

first RLC layer package received after handover.

It can be observed in Probe.

HOIntraLTEInterruptUserPlane ___

CLIRATHOInterruptUserPlane 2___

GLIRATHOInterruptUserPlane 2___

WLIRATHOInterruptUserPlane 2___


3. Recommended KPI


Recommended KPIs

o The recommended KPIs at this phase include:

KPI Class KPI Name

Accessibility

RRC Setup Success Rate (service)

RRC Setup Success Rate (Signal)

ERAB Setup Success Rate (ALL)

Retainability Call Drop Rate (ALL)

Mobility Intra-frequency Handover Out Success Rate

Traffic

Radio Bearers for Total and QCI 1~9

Downlink Traffic Volume for Total and QCI 1~9

Uplink Traffic Volume for Total and QCI 1~9

IntegrityService Downlink Average Throughput for QCI 1~9

Service Downlink Average Throughput for QCI 1~9


Performance Data Manager

(iManager PRS V100R006 Product Description V1.1)

The PRS is a platform used to manage mobile network performance reports

and analyze network performance.


Customizing Reports

(iManager PRS V100R006 Product Description V1.1)


Restrictions on Measurement Activations

o The period of measurement on northbound

interface should be for 15mconsist with

southbound interface. So far, Huawei support

15minutes and 60minutes periods as default.

o There is no restrictions on the number of NE

objects, measurement objects minutes and 60

minutes measurement periods. M2000 can

provide all measurement results of all

managed NEs via northbound performance

file interface.


http://www.ppt-vorlagen.de/http://www.ppt-vorlagen.de/

module 4-lte kpi introduction

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