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Equipment for Testing Mobile QoS. Joachim Pomy [email protected] OPTICOM, Germany. ITU Workshop on “Monitoring and Benchmarking of QoS and QoE of Multimedia Services in Mobile Networks” (Buenos Aires, Argentina, 24-25 July 2014). [Content].

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equipment for testing mobile qos

Equipment for Testing Mobile QoS

Joachim Pomy

[email protected], Germany

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

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

Buenos Aires - Argentina - 24 - 25 July 2014

slide2

[Content]

ITRs: Setting the stage for a connected world

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
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

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

slide8

[Content]

ITRs: Setting the stage for a connected world

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
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)

Buenos Aires - Argentina - 24 - 25 July 2014

slide10

[Content]

ITRs: Setting the stage for a connected world

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
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

Buenos Aires - Argentina - 24 - 25 July 2014

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.

Buenos Aires - Argentina - 24 - 25 July 2014

slide13

[Content]

ITRs: Setting the stage for a connected world

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
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

Buenos Aires - Argentina - 24 - 25 July 2014

slide15

[Content]

ITRs: Setting the stage for a connected world

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
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

Buenos Aires - Argentina - 24 - 25 July 2014

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.

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

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

Buenos Aires - Argentina - 24 - 25 July 2014

slide20

[Content]

ITRs: Setting the stage for a connected world

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
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 !!!!

Buenos Aires - Argentina - 24 - 25 July 2014

slide22

[Content]

ITRs: Setting the stage for a connected world

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
any questions
Any questions ?

Contact:[email protected]

Buenos Aires - Argentina - 24 - 25 July 2014

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