International Telecommunication Union - ITU

Nairobi, Kenya, 26 – 27July 2010

Identification of QoS/QoE parameters and their thresholds for different telecommunication services

Kwame Baah-Acheamfuor

Senior Manager

National Communications Authority, Ghana

ITU-T Workshop on Delivering Good Quality Telecommunication Service

in a Safe Environment in Africa

(Nairobi, Kenya, 26th July 2010 )

Overview

IDENTIFYING QoS/QoE Parameters

Defining QoS/QoE Parameters

Setting Thresholds for QoS/QoE parameters

The Africa Scenerio


QoS Monitoring Process


Start

Define a set of user-related QoS parameters for each service of interest by referring to relevant QoS guides/ recommendations from standards bodies.

Request for a regular submission of quality of service report from operators and adopt technical measures (audit, inspection) to verify correctness of data.

By taking into consideration the values submitted by operators and by referring to target values recommended by standard bodies, propose a set of QoS parameters and their corresponding target

values.

Carry out a primary survey- Request for data from operators on the QoS parameters.

Finalise the set of performance standards for each telecommunication service and publish same

through an appropriate regulatory instrument (e.g.

directives, regulation, etc.)

Conduct a consultation exercise on issues related to quality of service, including the proposed QoS parameters and their corresponding target values.

Fine-tune performance standards to gradually

increase QoS level in the telecoms sector.

IDENTIFYING QOS/QOE PARAMETERS

KEYWORDS and PHRASES:

Define

Set of User related QoS Parameters

For Each Service of Interest

With Reference to

Relevant Guidelines and Recommendations

From Standard Bodies


ETNO/ETSI PROPOSAL FOR SELECTION OF QOS/QOE PARAMETERS

QoS parameters should be easily understood by the public, and be useful and important to them.

All parameters are applicable at the network termination point.

Parameters should be capable of verification by independent organizations.

The accuracy of QoS parameter values should be set to a level consistent with cost-effectively available measurement methods.

The parameters are designed for both statistical and individual application.


Applying the simple rule of the QoS matrix presented in ITU-T Recommendation G.1000.

PRINCIPLE OF MATRIX:

First Step>>Identify the different functions experienced or performed by the customers when using the communication service.

Second step>>List the criteria used by the customer to judge the quality with which each of these functions is performed.

Final Step>>> Populate the cells with performance parameters, and performance objectives may then be set.


ETNO QoS matrix


CONSIDERATIONS FOR DEFINITION OF MEASUREMENT FOR A QOS PARAMETER

The following factors, among others, should generally be taken into consideration:

The practicability for operators to make the required measurements;

The practicability for regulators or any independent entity to audit the results;

The measurement being made should retain the customer experience aspect.


SETTING THRESHOLDS FOR QOS PARAMETERS

REGULATORS MANDATE OR OPERATORS INFLUENCE???


EXAMPLES OF QOS PARAMETERS AND TARGETS ACROSS AFRICA


MOBILE TELEPHONY


Uganda Ghana Tanzania Egypt

QoS Parameter Definition Target Definition Target Target TargetTCH Congestion probability of not

accessing a traffic channel-TCH congestion

< 0.5% TCH Connect failure/number of attempts

≤1% None None

Call Block Rate Percentage number of calls that are blocked after calls set up

< 2% None None None ≤ 2%

Call Drop Rate percentagenumber of calls that aredropped after connection tothe system or networkduring the call duration.

< 2% Percentage number of calls that are dropped over number of call attempts

≤3% <3% ≤ 2%

Call Completion

Success call is one which terminates with 'no'answer'on voice mail service, announcement that subscriber is not available, with abusysignal, with an announcement that wrong number has been dialled

>99% for intra network

Percentage number of Calls that have completed conversations/number of attempts

>70% >99% for intra network

None

INTERNET AND DATA NETWORKS


QoS Parameter Definition Target Definition Target Target Target

Availability Measure of degree to which the access network is operable and…

≥99.9% Ás measuredd in data networks

≥99.9% 99% Annual

≥99.9%

Utilisation None None As measured in data networks

≤ 80% None ≤ 80%

Latency None None None None None Local 150-200ms International 200-250ms

Packet loss None None None None None ≤1%

Thank you for participation


International Telecommunication Union - ITU

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