Equipment for Testing Mobile QoS

Buenos Aires - Argentina - 24 - 25 July 2014 1

Equipment for Testing Mobile QoS

Joachim [email protected]

OPTICOM, Germany

ITU Workshop on “Monitoring and Benchmarkingof QoS and QoE of Multimedia Services in

Mobile Networks”

(Buenos Aires, Argentina, 24-25 July 2014)


Equipment for Testing Mobile QoS Measurements Test Scenarios Trigger Points Test Equipment Testing for various Services Practical Hints POLQA - Voice Quality - Hot Topic

ITRs: Setting the stage for a connected world

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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 MaintenanceProtocol 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 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 networkAlso, customer complaints are a vital source of feedback on

the QoS, and must not be ignored


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 requirementsWill allow performing the proposed measurements In a reliable and reproducible way


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

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 equipmentglobally recognized as "the requirement" in the areaextremely compehensivedetailed instructions




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Test Scenarios

Test scenarios need to distinguish the following principal user casesUser-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)




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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 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.




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Mobile QoS Test-equipment (MQT)

Geographical data collection during a mobile measurement Position, speed and headingTaken from GPS whenever possible. If no GPS available use other tools

e.g. navigation on a geo-referenced bitmap




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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 Equipmenthardware 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

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; orVideo Telephony using a Video Telephony Stack on the PC.


MQT for FTP

FTP client to support the following functions:Active / Passive ModeCommon Firewall supportDownloading from subdirectories.Uploading to subdirectories


Mobile based measurement equipment

Functionalities of the MQT can also be realised on a single mobile phoneDifferent types of QoS tests can runTest results can be logged for post processingMobile based measurement equipment may be

controlled by an application, remotely or may be operated by a human




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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 MobileASK YOUR PHONE PROVIDER !!!

they are RARE !!!!




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Any questions ?

Contact:[email protected]

Documents

Equipment for Testing Mobile QoS