Lecture Notes in Computer Science 4606 CommencedPublicationin1973 FoundingandFormerSeriesEditors: GerhardGoos,JurisHartmanis,andJanvanLeeuwen EditorialBoard DavidHutchison LancasterUniversity,UK TakeoKanade CarnegieMellonUniversity,Pittsburgh,PA,USA JosefKittler UniversityofSurrey,Guildford,UK JonM.Kleinberg CornellUniversity,Ithaca,NY,USA FriedemannMattern ETHZurich,Switzerland JohnC.Mitchell StanfordUniversity,CA,USA MoniNaor WeizmannInstituteofScience,Rehovot,Israel OscarNierstrasz UniversityofBern,Switzerland C.PanduRangan IndianInstituteofTechnology,Madras,India BernhardSteffen UniversityofDortmund,Germany MadhuSudan MassachusettsInstituteofTechnology,MA,USA DemetriTerzopoulos UniversityofCalifornia,LosAngeles,CA,USA DougTygar UniversityofCalifornia,Berkeley,CA,USA MosheY.Vardi RiceUniversity,Houston,TX,USA GerhardWeikum Max-PlanckInstituteofComputerScience,Saarbruecken,Germany Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Aiko Pras Marten van Sinderen (Eds.) Dependable and Adaptable Networks and Services 13th Open European Summer School and IFIP TC6.6 Workshop, EUNICE 2007 Enschede, The Netherlands, July 18-20, 2007 Proceedings 1 3 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. VolumeEditors AikoPras MartenvanSinderen UniversityofTwente FacultyofEEMCS POBox217,7500AE,Enschede,TheNetherlands E-mail:{A.Pras,M.J.vanSinderen}@ewi.utwente.nl LibraryofCongressControlNumber:2007930222 CRSubjectClassification(1998):C.2,C.3,D.4,D.2,H.4,H.3,H.5,K.4 LNCSSublibrary:SL3–InformationSystemsandApplication,incl.Internet/ WebandHCI ISSN 0302-9743 ISBN-10 3-540-73529-1SpringerBerlinHeidelbergNewYork ISBN-13 978-3-540-73529-8SpringerBerlinHeidelbergNewYork Thisworkissubjecttocopyright.Allrightsarereserved,whetherthewholeorpartofthematerialis concerned,specificallytherightsoftranslation,reprinting,re-useofillustrations,recitation,broadcasting, reproductiononmicrofilmsorinanyotherway,andstorageindatabanks.Duplicationofthispublication orpartsthereofispermittedonlyundertheprovisionsoftheGermanCopyrightLawofSeptember9,1965, initscurrentversion,andpermissionforusemustalwaysbeobtainedfromSpringer.Violationsareliable toprosecutionundertheGermanCopyrightLaw. SpringerisapartofSpringerScience+BusinessMedia springer.com ©Springer-VerlagBerlinHeidelberg2007 PrintedinGermany Typesetting:Camera-readybyauthor,dataconversionbyScientificPublishingServices,Chennai,India Printedonacid-freepaper SPIN:12088300 06/3180 543210 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Preface The maingoalofthe EUNICE Summer Schoolis togiveyoungresearchers,and particularly PhD students, the opportunity to present their work at an interna- tionallevel.TheEUNICESummer Schoolalsoseekstooffercomprehensiveand inspiringinvited talks fromexperiencedexperts in the field, providinga context for discussions on ongoing researchand new challenges. The EUNICE Summer School is an initiative of the European University Network of Information and Communication Engineering,or EUNICE Network for short. Although the summer school events are organized by the member institutions takingturns,submissiontoandparticipationinthe eventsareopen to researchers outside the EUNICE Network. The 13th EUNICE Summer School returned to Enschede, The Netherlands, whereitwashostedearlierin2000.Backin2000,thethemeofthesummerschool was ‘Innovative Internet Applications.’ Much has changed since then: wireless network technologies have become a constantly growing part of the Internet infrastructure, and increasingly smaller and more powerful computing devices with flexible connectivity open the possibility of new services and applications. The EUNICE 2007 theme, ‘Dependable and Adaptable Networks and Ser- vices,’ linked to this change and how it affects and is affected by research in the field of information and communication technology. One of the main chal- lenges in the next decade will be to make the Internet and the services that are provided on top of it more dependable and adaptable. Research on this theme is needed for fixed, wireless and ad-hoc networking, ubiquitous communication andcomputing,sensornetworks,andcontext-awareness.Whileindividualmobile applicationswith context-awareandpersonalizedfeatures emerged,atthe same time many challenges for network and service architectures were imposed con- cerning integration, interoperability, management, provisioning, reliability and security.Onthe onehandresearchhasto makeavailableasoundunderstanding oftheseapplicationsandtheirsupportingserviceandnetworkarchitectures.On the other hand, research should produce service and network infrastructure so- lutions to be able to provide the necessary quality of service for the envisioned applications. We receivedmany submissions onthese topics, but unfortunately couldonly accept 17 papers for presentation at the summer school. A fair evaluation and selection of papers was only possible thanks to the first-class reviews, at least three per submitted paper, from our Program Committee members. The ac- cepted papers were grouped as follows in sessions for the single-track technical program: (1) Middleware and Supportive Services, (2) Context-Awareness, (3) Voice over IP, (4) User Behavior, Security and Legal Aspects, (5) Performance Aspects,and(6)NovelArchitectures.Thistechnicalprogramwascomplemented with four invited keynotes. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. VI Preface We would like to take this opportunity to express our thanks and grati- tude to the sponsorsand supportersof the 13thEUNICE Summer School:IFIP TC6WorkingGroup6.6,IEEECommunicationsSociety,Euro-NGI,EMANICS, Springer, NWO, and CTIT. Many people worked very hard to make this summer school a success. Spe- cial thanks go tothe ProgramCommittee members for their efforts necessary to maintainthehigh-qualitystandardoftheEUNICESummerSchool,toAnnelies Klos for her essentialsupport in to the localorganization,and to Remco van de Meentforhiscontributionduringthepreparationoftheconferenceproceedings. May 2007 Aiko Pras Marten van Sinderen Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. EUNICE — Member Charter European Network of Universities and Companies in Information and Communication Engineering. 1 Mission The European universities and companies signing this charter are anxious to improve in a permanent manner the quality and relevance of their teaching and research in the field of information and communication technologies. They declare their desire to co-operate in the following ways: – By jointly developing and promoting the best and compatible standard of European higher education and professionals in information and communi- cation technologies – By increasing scientific and technical knowledge in the field of telecommu- nications and developing their applications in the economy 2 Membership ThenetworkismadeupofEuropeanuniversitieswithintheEuropeanUnionand outsideit,whetherfromWestern,CentralorEasternEurope.Theseuniversities are involved at their own appropriate organization level, taking into account the mission of the network. The parties signing the present charter will be the “foundingpartners.”Otheruniversities,verylimitedinnumber,mightbeinvited to join the network as “members.” Transnational companies, working together with the universities on infor- mation and communication technologies, and representatives from the relevant commissionoftheEuropeanUnionwillbeofferedtheopportunitytobeassociate members. No institution can apply for membership. 3 Education The partners will seek the development of high-level compatibility of the exist- ing or commonly developed courses and programs, in order to facilitate their recognition by employers independently of their geographical location in Eu- rope.Toachievethisgoal,the partnerswill,insidethe network,workonmutual recognition of these courses and programs. To develop interculturality, these courses and programs will be accessible in suchawayastoencourage,asfaraspossible,long-durationmobilityforstudents Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. VIII Organization and faculty members from one country to another (i.e., several months). To set compatible standards, shorter-durationoperations will be conducted such as: – Summer schools for young faculty members and PhD students – Intensive seminars, in limited numbers, for students – Short-duration mobility for faculty members for teaching assignments – Use of new technologies in education Finally, the partners will take advantage of the network of relations set up as described above to develop common modules for onsite training, for the world industry. 4 Research The partnerswill also take advantageof this networkto collaborateonresearch and development projects which could be carried out in common by several of them and which could lead to marketable applications in particular. 5 Organization and Structure To achieve the above-mentioned aims, the institutions concerned will form a flexible structure whose role will be to think about and decide on joint actions. It will be called the steering group and will meet twice a year. The network would have no legal status. However, the network may authorize a member or set of members to act on its behalf. Concrete proposition in education and research will be worked out in small working groups of at least two partners, chosen by the steering group as op- portunities arise. Finally, a permanent secretariat, located at France Telecom University, will be established to co-ordinate all the information relevant to the network’s activities. 6 Means and Finance The institutions concernedwill provide the specific financial and/orinkind sup- portnecessaryfor the smoothrunning of the network,notably humanresources (research lecturers, engineers, administrators, etc.). The partners in the network will share information about funding opportu- nitiesandseek,asoftenasnecessary,financialaidfrompublicauthoritiesforits actions: – Within each country – Frombilateralprogramsatacountrylevel,wheneversuchfinancialaidsexist – And finally at the European level by means of community schemes (ERAS- MUS, COMETT, TEMPUS, RACE, ESPRIT,..., scientific and technologi- calco-operationwith Centraland EasternEurope,..., humanresourcesand mobility, etc.) Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Organization IX All things being equal regarding a specific action within the scope of the network,a member will prefer co-operationwith other members ofthe network. EUNICE Member Institutions Finland Tampere University of Technology France ENST Bretagne, Brest ENST Paris Loria University Poincar´e,Nancy Telecom INT, Evry Germany Universita¨t Karlsruhe Technische Universita¨t Mu¨nchen Universita¨t Stuttgart Hungary Budapest University of Technology and Economics Italy Politecnico di Torino Netherlands University of Twente Norway Norwegian University of Science and Technology, Trondheim Russia St. Petersburg State University of Telecommunications Spain Universidad Carlos III de Madrid Universitat Polit`ecnica de Catalunya Technical University of Madrid UK University of Sussex University College London Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Organization EUNICE 2007 was organised by the Centre for Telematics and Information Technology of the University of Twente, The Netherlands. Technical Program Committee Co-chairs Aiko Pras University of Twente, The Netherlands Marten van Sinderen University of Twente, The Netherlands Local Organization Aiko Pras University of Twente, The Netherlands Annelies Klos University of Twente, The Netherlands Marten van Sinderen University of Twente, The Netherlands EUNICE 2007 Technical Program Committee Arturo Azcorra Carlos III University, Spain Boudewijn Haverkort University of Twente, The Netherlands Burkhard Stiller University of Zu¨rich and ETH Zu¨rich, Switzerland Carlos Delgado Kloos Carlos III University, Spain Daniel Kofman ENST Paris, France David Larrabeiti Carlos III University, Spain Edit Hala´sz Budapest University of Technology and Economics, Hungary Finn Aagesen NTNU, Norway Hermann De Meer University of Passau, Germany Isabelle Chrisment Henri Poincar´e University, France Jarmo Harju Tampere University of Technology, Finland Joerg Eberspaecher Technical University of Munich, Germany Juergen Schoenwaelder Jacobs University Bremen, Germany Lu´ıs Ferreira Pires University of Twente, The Netherlands Mark Burgess University College Oslo, Norway Markus Fiedler BTH, Sweden Martin Ko¨hn University of Freiburg, Germany Maryline Laurent-Maknavicius Laurent-Maknavicius,INT, France Matthias Hollick TU Darmstadt, Germany Maurice Gagnaire ENST, France Maurizio Munafo` Turin Polytechnic, Italy Mikhail Smirnov Fraunhofer FOKUS, Germany Olivier Festor LORIA-INRIA, France Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. XII Organization Paul Ku¨hn University of Stuttgart, Germany Ralf Lehnert TU Dresden, Germany Ralf Steinmetz TU Darmstadt, Germany Robert Szabo Budapest University of Technology and Economics, Hungary Rolv Braek Norwegian University of Science and Technology, Norway Samir Tohm´e Versailles Saint-Quentin-en-Yvelines University, France Sebastian Abeck University of Karlsruhe, Germany Sebastian Sallent TU Catalunya, Spain Tamas Henk Budapest University of Technology and Economics, Hungary Thomas Plagemann University of Oslo, Norway Tibor Cinkler Budapest University of Technology and Economics, Hungary Yvon Kermarrec ENST Bretagne, France Sponsors Centre for Telematics and Information Technology EMANICS Network of Excellence Euro-NGI Network of Excellence IEEE Communications Society IFIP TC6 Working Group 6.6 Nederlandse Organisatie voor Wetenschappelijk Onderzoek Springer Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark.