Transcript 04Dehnel

EURESCOM Project P807 JUPITER 2
AOS - Acceptability of
Service
Astrid Dehnel
Deutsche Telekom Berkom Gmbh
Goslarer Ufer 35, D-10589 Berlin
Tel.: +49 30 34 97 23 86
FAX: +49 30 34 97 23 87
E-Mail: [email protected]
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Presentation Topics
 Our
view to QoS - definitions of terms used
 The
definition of Acceptability
 Concepts
for Measuring User Acceptance of NQoS
 Examination
of QoS and AoS within Jupiter 2 T4/T5
 Overview
about methods used
 Summary
and outlook
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
QoS - a user related term
Quality of Service (QoS):
The collective effect of service performance which
determines the degree of satisfaction of a user of the
service. (ITU-T Rec. E.800)
It is mentioned in a note to this definition that QoS is
characterised by the combined aspects of
service support performance
service operability performance
serveability performance
service security performance
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
The network related aspects of QoS
For the work within JUPITER 2 network related Tasks the
term Network QoS as a part of QoS is defined as follows:
Network QoS (NQoS):
The end-to-end characteristics offered by a network
delivering data (between end-systems).
Network performance (NP):
The actual (measured) characteristics of the network –
it’s ability to meet the offered Network QoS.
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Acceptability in the field of economics
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Acceptability of service (AoS) for telecommunications
Product specific
determinants
functionality
implementation,
standardization
usability
charging,
account
QoS
design
availability of
platforms,
compatibility
information
standard
AoS
subjective
benefit,
profit
acellerated
cycles of
innovations
advertising
attitude,
motivation,
predilection to
technology
infrastructure
expectations
risk
readiness
User specific
determinants
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
Surroundings
specific
determinants
EURESCOM Project P807 Jupiter 2
Acceptability of service (AoS) for telecommunications
The acceptance (Acceptance: Ratio of actual users in the
target group) of an existing service can be measured easily
counting the users of this service. However, a reference value –
the quantity of the target group regarding the investigated service
– has to be determined for evaluating the acceptability.
Acceptability of Service (AoS):
Multidimensional property of a service, describing how
readily a customer will use the service, represented as
the ratio of the number of potential users to the
quantity of the target group.
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Measurement points for quality aspects
e.g. charge
Measurement points of network QoS and userexperienced quality aspects affected by it.
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Task 4 / Task 5 Process
12
10
8
e.g. Delay
Upper
6
Lower
4
2
0
Network Now
Determine current Intranet characteristics
for loss, delay and delay variation
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Task 4 / Task 5 Process
12
10
8
e.g. Delay
Upper
6
Lower
4
2
0
Network Now
User
Requirements
Using these initial values determine limits
for users’ acceptance of the service
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Task 4 / Task 5 Process
12
10
8
e.g. Delay
Upper
6
Lower
4
2
0
Network Now
User
Requirements
Network with
QoS
Use the network QoS technologies to achieve network
performance that meets users’ requirements
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
QoS Technologies under study
How do we use these network building blocks to meet
the Users’ Requirements?
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RSVP (Resource ReSeVation Protocol)
RSVP over ATM
IP Differential Services
Winsock2 (support for native ATM and RSVP)
Queuing technologies (Weighted Fair Queuing, etc)
H.323 Gatekeeper
Multimedia Conference Manager
Subnet Bandwidth Manager
IEEE802.1p
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Used methodology for streaming video quality
Simulated network
with different
parameters for:
- delay
- packet loss
- delay variation
e.g. NetShow

Single stimulus presentation like
ITU-T Rec. 920

short, tightly controlled test
sequences and longer natural test
sequences

standard or realistic audio-, videoand audio-visual related task

pre-task questionnaire about
quality and acceptance
pre-test questionnaire
5-point category scale
Yes/No question for acceptance
12 or more subjects




Subject
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Used methodology for conferencing service
e.g. Netmeeting (H.323)
e.g. Netmeeting (H.323)
Hallo?
I am Ann. ...
Simulated network
with different
parameters for:
- delay
- packet loss
- delay variation
Subject 1
....
( Subject 3)
Heidelberg, 14-15 October 1998
I am fine ...
?
e.g. Netmeeting (H.323)
(
QUTE’98 Workshop
Who are you ?
)
Subject 2
EURESCOM Project P807 Jupiter 2
Used methodology for conferencing service
e.g. Netmeeting (H.323)
Hallo? ...



Subject 1
Simulated
network

Who ..?

I am...
?


Subject 2
QUTE’98 Workshop
Heidelberg, 14-15 October 1998

Interactive test like ITU-T Rec. 920
subjects communicate each other
standard or realistic audio-, video- and
audio-visual related task
pre-task questionnaire about quality
and acceptance incl. charge
pre-test questionnaire
5-point category scale for quality
evaluation
Yes/No question for acceptance
6 or more couple of subjects
EURESCOM Project P807 Jupiter 2
Users perception under study
Quality Judgements for:
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Overall audio-visual quality
Video quality
Audio quality
response time
information loss
Also related to different charge.
Acceptability questions about:



Overall audio-visual quality
Video quality
Audio quality
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
Also related to different charge.
EURESCOM Project P807 Jupiter 2
Summary and outlook
Acceptability of service
T5
T4
Quality of service
Provided quality
Perceived quality / Accepted quality
Operating Company’s
Point of View
Customer’s
Point of View
Measure
Measure
Objective Parameters
measured within the network
Subjective Parameters
mapped to objective measures
obtained from customer surveys
Operators perception
Customers perception
Comparison, Analysis & Action plans
QUTE’98 Workshop
Heidelberg, 14-15 October 1998
EURESCOM Project P807 Jupiter 2
Summary
We have high expectations about the results
and we hope our work will be accepted.
QUTE’98 Workshop
Heidelberg, 14-15 October 1998