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TitleGetting Personal - DiVA Portal
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Licentiate Thesis in Communication Systems
Stockholm, Sweden 2011

A T H A N A S I O S K A R A P A N T E L A K I S

A Framework for Context-Aware Services and System Design

for Contemporary Mobile Environments

Getting Personal

K T H In fo rma t i o n and

Comm un i ca t i on Te c hno l ogy

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Getting Personal

A Framework for Context-Aware Services and System Design for Contemporary

Mobile Environments

ATHANASIOS KARAPANTELAKIS

Licentiate Thesis in Communication Systems

Stockholm, Sweden 2011

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3.5. REMARKS 51

Figure 3.10: This plot showing the percentage of discarded PUBLISH
messages from the CB, depending on the volume of incoming messages.

increase in the error rate, which is very prominent beyond 1200 messages/sec.
This means that our CB in its present form can sustain up to 400 presence
user agents (assuming that these agents send periodic updates every second);
larger systems will have to distribute the handling of PUBLISH messages over
multiple CBs.

3.5 Remarks

This Chapter presents a mobile printing solution for workspace environments,
which is the first practical example of using the context aware framework
implemented for this dissertation (see Chapter 2). In the context of this
printing service, this framework handles print requests from mobile devices
by choosing printers that are most suitable for serving each request. The
criteria for this choice are not only based on user context (in this case, the
relative distance of the user from each of the printers), but also on each
printer’s current status and capabilities. To overcome the problem of printer
software support on mobile devices, we implemented software agents that
act as mediators between a printer and a mobile device, and presented a
protocol for mobile devices to communicate with those agents. The mobile

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52
CHAPTER 3. INTELLIGENT PRINTING SERVICES FOR MOBILE

DEVICES

application features an adaptive user interface, based on the users’ application
usage history.

Our proposed solution takes advantage of existing hardware resources and
protocols, and is therefore immediately applicable to many environments. The
system was exposed for public use and we measured various performance
aspects. Based on the measurement results, we were able to draw some
meaningful conclusions which influenced later versions of the context-aware
framework.

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112 APPENDIX B. LISTINGS OF TRANSFORMED CONTEXT

Duration>
</bp : educationEntry>

</bp : educationBackground>
<bp : workBackground>

<bp : employment>
<bp : companyName>"Conformiq AB"</bp

: companyName>
<bp : pos i t i on >" S o lu t i on s Arch i t ec t

"</bp : pos i t i on >
<bp : industry >"Computer Software "</

bp : industry>
<bp : Duration >" Apr i l 2009 − cur r ent

"</bp : Duration>
<bp : locat ion >"Saratoga , CA"</bp :

locat ion >
</bp : employment>
<bp : employment>

<bp : companyName>" Er i c s son AB"</bp :
companyName>

<bp : pos i t i on >" S o lu t i on s Arch i t ec t
"</bp : pos i t i on >

<bp : industry >"Telecommunications
"</bp : industry>

<bp : Duration >"October 2007 −
November 2008"</bp : Duration>

<bp : locat ion >"Stockholm , Sweden"</
bp : locat ion >

</bp : employment>
</bp : workBackground>

</bp : b u s i n e s s P r o f i l e >
<md: mediaFi les>

<md: aud ioF i l e s >
<md: audioTrack>

<md: s inge r >"Frank S inat ra "</md:
s inger >

<md: s o n g t i t l e >"New York New York
"</md: s o n g t i t l e >

<md: re l easeYear >1977</md:
re l ea seYear>

</md: audioTrack>
<md: audioTrack>

<md: s inge r >" El la F r i t z g e r a l d "</md:
s inger >

<md: s o n g t i t l e >"Nice Work I f You
Can Get I t "</md: s o n g t i t l e >

<md: re l easeYear >1983</md:
re l ea seYear>

</md: audioTrack>
</md: aud ioF i l e s >

</md: mediaFi les>
</r d f :RDF>

Listing B.6: Aggregated profile information (user profile) for user Athanasios
Karapantelakis.

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www.kth.se

TRITA ICT-COS-1104

ISSN 1653-6347

ISRN KTH/COS--11/04--SE

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