Overlays in highly dynamic environments: design, performance and applications - MOBBESKAJP
Academic coordinator: Viktoria Fodor, Communication Networks (LCN)
Project leader: Dan Jurca, ACCESS postdoc
Other project members:
Bastiaan Kleijn, Sound and Image Processing (SIP),
Erik Aurell, Supriya Krishnamurthy and Petter Holme, Computational Biology (CB), Gunnar Karlsson and György Dán (LCN)
The challenges addressed in MOBBESKAJP are to construct overlays and to control data transmission for voice, video and data communication between autonomous mobile units (cell phones) or in heterogeneous wired/wireless networks with many mobile users, also considering the extreme case of intermittent connectivity. Besides a lowering of costs to end customers, the results of the project are expected to find use in e.g. ad hoc networks in emergences.
The project will cover the following topics: i) analysing the characteristics of the relevant networking scenarios; ii) designing overlay topologies for voice, video and data communication between mobile units and designing self-configuring, self-maintaining and self-healing mechanisms for such overlays, iii) designing communication/routing strategies, source coding and traffic control solutions suitable for peer-to-peer communication. The project will perform theoretical work and aims at testing some of the proposed solutions with an end-system prototype. The project members represent three laboratories at KTH and have expertise in the areas of complex systems, teletraffic theory, and audio and video coding.
We define the overlay properties that allow efficient content retrieval and media distribution in very dynamic networks. Then, we propose distributed algorithms for constructing and maintaining such overlays.
We evaluate how solutions designed for fixed networks perform in more dynamic environments, where peers holding the content leave the overlay frequently, and the underlying physical network changes due to peer mobility. We define storing and replication rules to keep the content present and easy to access.
We evaluate how multiple-description coding (MDC) can be applied in networks where the stream is distributed through an application layer overlay, where nodes can not restore missing information but can generate redundant information.
In: IEEE/IFIP WONS 2008
Date: January 2008
Analytic evaluation of content distribution strategies in sparse ad hoc networks
Journal: IEEE/ACM Transations on Networking, Volume 16, Number 4, August 2008, pages 814-825.
Date: August 2008
The paper presents an analytical study of dynamic membership (aka churn) in structured peer-to-peer networks.
In: ACM MOBICOM CHANTS Workshop
Date: September 2008
Experimental evaluation of content distribution strategies in sparse ad hoc networks
In: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)
Date: September 2008
Note: Invited Paper
System aspects for wireless content distribution
Journal: Kluwer Wireless Networks
Date: February 2008
Scheduling for joint unicast and multicast for wireless content distribution