Communications

New paper accepted for publication

The manuscript entitled as QoE-driven dynamic management proposals for 3G VoIP services authored by Jose-Oscar Fajardoa, Fidel Liberal, Is-Haka Mkwawa, Lingfen Sun and Harilaos Koumaras has been accepted for publication by the Journal of Computer Communications, Elsevier.

In this paper the authors propose a combined approach where service level adaptation is considered first and, provided that no suitable parameter combination is capable of providing enough QoE, a change of network state will be suggested. In order to do so we analyse the performance of the end-to-end (e2e) performance metrics in this convergent scenario, the root causes of possible degradations and, finally, the combined effects of the different network segments and their impact on the user perceived QoE. We show the the map of best performing VoIP configurations for every state of the network segments. Furthermore, considering each of these configurations, we analyse the acceptability of the service or the convenience of trying to modify the network state. Finally, a lightweight implementation based on simple network state estimation and decision heurisitics is proposed and validated in terms of accuracy and responsiveness.

Workshop on Impact of Scalable Video Coding on Multimedia Provisioning (SVCVision)

Collocated with MobiMedia – 6th International Mobile Multimedia Communications Conference
6th-8th September 2010 – Lisbon, Portugal

http://www.mobimedia.org/ws_SVCVision.html

Aims and Scope
Scalable Video Coding (SVC) refers to the possibility of removing certain parts of a video bit stream in order to adapt it to a changing usage environment, e.g., end device capabilities, network condition or user preferences. SVC has been an active standardization and research area for at least 20 years, reaching back to H.262/MPEG-2, which offered scalable profiles. However, these previous attempts suffered from a significant loss in coding efficiency as well as a large increase in decoder complexity (and thus energy consumption), which hindered market adoption. Only the most recent attempt, i.e., the SVC extension of H.264/AVC, focuses on avoiding these disadvantages. Since H.264/SVC standardization started in 2003, it has been at the focus of many multimedia research groups.

Today’s increasing variety of end devices (smart phones, tablet PCs, Netbooks, Laptops, PCs, networked HDTVs, …) and the associated multitude of Internet connectivity options (GPRS/EDGE, UMTS, ADSL, PLC, WiMAX, …) provide particular momentum for SVC, which can be easily and pervasively adapted to these various usage environments. SVC also allows end devices to only decode a sub-set of the SVC bit stream, thus enabling in particular mobile end devices to minimize the necessary (processing) power requirements.

This workshop aims to provide a forum for both academic and industrial participants to exchange and discuss recent advancements and future perspectives of SVC.

SVC topics of interest include, but are not limited to:
– Robust streaming, error resilience and error concealment
– Streaming in heterogeneous environments
– Peer-to-Peer (P2P) video distribution
– Internet Protocol television (IPTV)
– Energy-efficient video distribution
– Content adaptation (e.g., scaling, rewriting, transcoding) and summarization
– Complexity optimization and new tools for achieving scalability
– Adaptation decision taking & context information
– Storage & file format
– Conditional access & protection
– Novel applications & implementation experiences

Important Dates
Paper Submission: 23. April 2010
Notification: 28. May 2010
Camera Ready: 25. June 2010

All accepted papers will be published in Springer Lecture Notes of ICST (LNICST) series and included in major article indexing services.

2nd IEEE PEDISWESA’10

2nd IEEE Workshop on Performance Evaluation of Communications in
Distributed Systems and Web based Service Architectures (PEDISWESA’10)

RIccione, Italy, June 22 – 25, 2010

In conjunction with the 15th IEEE Symposium on Computers and Communications (IEEE ISCC’10)

http://lacl.univ-paris12.fr/mokdad/WorkshopIscc2010/index.htm

http://www.ieee-iscc.org/2010/

Scope

Performance evaluation is still a topic that attains a lot of attention in both distributed
and mobile systems as well as Web based services architectures. Due to the recent
advances in internet based applications as well as distributed and mobile communication systems, we are witnessing a variety of new technologies. However, these systems
are becoming very large and complex at the same time. Several challenges remain to be
resolved before these systems become a commodity. Guaranteeing QoS and provisioning
of web-based systems as well as distributed and mobile systems and evaluating their
communication performance represent among the challenging problem in the design of
these systems. Quantitative analysis can be very difficult and may be intractable because
of the state space explosion. New methods and tools have recently emerged for these
kinds of complex systems, such as Stochastic Automata Networks, Stochastic bounds, PEPA, just to mention a few.
This workshop focuses on the performance evaluation of both distributed and mobile
systems, as well as Web based services architectures using both analytical methods
and simulation studies. Authors are encouraged to submit full papers presenting new
research related to QoS and communication performance evaluation of these systems. Submitted papers must not have been previously published elsewhere nor currently under review in any another conference or journal.

Topics of interest include but are not limited to:
· Communication performance evaluation of distributed and mobile systems
· Performance evaluation of distributed and web-based systems · Measurement, analysis, modeling · Tools and software for performance evaluation · Simulation and measurements techniques · QoS for Web services architectures · Services Web composition · Quantitative analysis · Stochastic comparisons · Network Protocols design for Web service devices · Routing optimization · Bandwidth management This workshop focuses upon the QoS and communication performance analysis, methods
and modeling of distributed systems and Web based services architectures. Workshop and Program Co-Chairs

Prof. Lynda Mokdad
University of Paris-EST, France

Prof Mirela Notare, Barddal University, Brazil

Important Dates

Paper submission deadline: March 8th, 2010
Notification of acceptance: March 28th, 2010
Camera-ready paper due: April 13th, 2010

Paper Submission

High-quality original papers are solicited. Papers must be unpublished and must
not be submitted for publication elsewhere. All papers will be reviewed by Technical Program Committee members and other experts active in the field to ensure high quality and relevance to the conference.
To submit your paper(s), http://edas.info/N8769
For IEEE formatting instruction and details, please reference to the IEEE Computer Society’s Conference Publishing Service:
http://www.computer.org/portal/site/cscps/menuitem.02df7cde46985ea21618fc2e6bcd45f3/index.jsp?&pName=cps_level1&path=cps/cps&file=s_forms.xml&xsl=neric.xsl&

IEEE PEDISWESA’10