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ITU Workshop on “Workshop on Practical measurement of QoS/QoE Parameters for Regulatory Compliance” (Cotonou, Benin, 16-17 July 2012). Equipment for Testing Mobile QoS. Joachim Pomy, SG 12 Rapporteur Consultant, Opticom GmbH Consultant@joachimpomy.de. [Content].

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Equipment for testing mobile qos

ITU Workshop on

“Workshop on Practical measurement of QoS/QoE Parameters for Regulatory Compliance”(Cotonou, Benin, 16-17 July 2012)

Equipment for Testing Mobile QoS

Joachim Pomy, SG 12 Rapporteur

Consultant, Opticom GmbH

Consultant@joachimpomy.de


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Measurement of qos in mobile
Measurement of QoS in Mobile

Measured from the perspective of an expert

Assessing the network to see if it delivers the quality that the network planner targeted (cf. Rec. ITU-T G.1000)

Tools and Methods for Operation and Maintenance

Protocol analysers are connected to BTSs, BSCs, and MSCs for a period of time to check for problems in the cellular network

Drive test (also walk tests) are used for monitoring operationally achieved QoS


Measurement of qos in mobile1
Measurement of QoS in Mobile

Drive tests allow the mobile network to be tested through the use of a team of people who take the role of users

Rate the QoS of the network

Not applicable to the entire network

Always a statistical sample

In Operation and Maintenance Centres (OMCs), counters are used for various events

Providing the network operator with vendor specific information on the state and quality of the network

Also, customer complaints are a vital source of feedback on the QoS, and must not be ignored


End to end qos testing in mobile
End-to-end QoS Testing in Mobile

Minimum requirement for QoS measurement equipment to ensure that

for all QoS parameters

trigger points are well defined

values are determined following wqell defined procedures

Test-equipment fulfilling the specified minimum requirements

Will allow performing the proposed measurements

In a reliable and reproducible way


Parameters are based on field measurements
Parameters are based on Field Measurements

Measurements from customers point of view

Full End-to-End perspective, taking into account needs of testing

Assumed end customer can handle his equipment and services to use

Operability is not evaluated at this time

For the purpose of measurement it is assumed that

service is not barred for any reason

routing is defined correctly without errors

target subscriber equipment is ready to process service request

speech and video quality values measured

Only to be applied to calls ended successfully

In order to receive proper statistical analysis


Not yet any itu standards in place
Not yet any ITU Standards in Place

ETSI TS 102 250 part 4

Speech and multimedia Transmission Quality (STQ); QoS aspects for popular services in GSM and 3G networks; Part 4: Requirements for Quality of Service measurement equipment

globally recognized as "the requirement" in the area

extremely compehensive

detailed instructions


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Test scenarios
Test Scenarios

Test scenarios need to distinguish the following principal user cases

User-to-user services (typically telephony)

Store-and-forward services (e.g. SMS)

Information services (e.g. accessing the internet or FTP download)

Push services (sender initiated transfer)


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Considerations on trigger points
Considerations on trigger points

It can be assumed that

any feasible test equipment will contain some kind of communication terminal (UE) which may be a special type (e.g. a Trace Phone)

or a standard UE

Also, it can be assumed that each such device will provide information from different communication layers

from Application Layer (close to the user interface)

down to lower layers, e.g. operating-system events, TCP/IP layer, or Layer 3 signalling information, which is used as trigger points for QOS PARAMETERS processing

Typically AT commands can be used in majority of cases

Action is typically triggered

by some emulated user action

causing some action on the air interface


Considerations on trigger points1
Considerations on trigger points

Process of event propagation is deterministic

allowing for kind of mapping between layers

associated with communication and processing delay in each stage.

Choice of the layer for trigger point information retrieval

determines the view expressed in a QOS PARAMETER

choosing lower-level events ( Layer 3) gives more network-centric view

events on higher levels to produce views more user-related

for same QoS PARAMETER source layer for events used as trigger points should be the same

In benchmarking, for all all networks under test

use same type of UE, and QOS PARAMETERS

use trigger points from the same layer.

Changing the source layer for a given trigger point

changes in QOS PARAMETERS should be expected

calibration measurements required

to assess influence on QOS PARAMETERS both quantitatively and qualitatively.


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Mobile qos test equipment mqt
Mobile QoS Test-equipment (MQT)

Geographical data collection during a mobile measurement

Position, speed and heading

Taken from GPS whenever possible.

If no GPS available use other tools

e.g. navigation on a geo-referenced bitmap


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Telephony voice
Telephony Voice

Means to generate necessary calls or to answer automatically incoming calls

Received speech sample is measured

via the analogue output of the User Equipment

hardware setup to include necessary electrical adaptation

Hardware setup of such a system is essential for the correctness of the measured QoS Parameters

Includes a UE specific part for the electrical adaptation

audio output of handset to input of the soundcard


Video telephony
Video Telephony

Means to generate necessary calls or to answer automatically incoming calls

Capability to provide the following measurement methods.

Video Telephony using the User Equipments application; or

Video Telephony using a Video Telephony Stack on the PC.


Mqt for ftp
MQT for FTP

FTP client to support the following functions:

Active / Passive Mode

Common Firewall support

Downloading from subdirectories.

Uploading to subdirectories


Mobile based measurement equipment
Mobile based measurement equipment

Functionalities of the MQT can also be realised on a single mobile phone

Different types of QoS tests can run

Test results can be logged for post processing

Mobile based measurement equipment may be controlled

by an application, remotely or

may be operated by a human


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Practical hints
Practical Hints

Which Mobile Phone to use ?

should be one offered in the shop ?

should be one used by new customers ?

should be one hipe to young people ?

should be one with good QoS ?

BUT

it MUST be a so-called Trace Mobile

ASK YOUR PHONE PROVIDER !!!

they are RARE !!!!


Equipment for testing mobile qos

[Content]

ITRs: Setting the stage for a connected world

  • Equipment for Testing Mobile QoS

    • Measurements

    • Test Scenarios

    • Trigger Points

    • Test Equipment

    • Testing for various Services

    • Practical Hints

    • POLQA - Voice Quality - Hot Topic


Hot topic polqa rec p 863
Hot Topic:POLQA™ - Rec. P.863



What we perceive
What we Perceive …

In a subjective ACR experimentPOLQA, PESQ and human beings perceive the following distortions:

POLQA Introduction - (c) OPTICOM GmbH 2010

31


Equipment for testing mobile qos

Performance Validation

  • The ITU has validated POLQA on:

  • Languages included in the POLQA validation:

  • 47000 file pairs across

  • 64 subjective experiments

  • German

  • Swiss German

  • Italian,

  • Japanese,

  • Swedish

  • American English and British English

  • Chinese (Mandarin),

  • Czech,

  • Dutch,

  • French,

POLQA Introduction - (c) OPTICOM GmbH 2010

32


Any questions
Any questions ?

Contact:Consultant@joachimpomy.de