1. University of Würzburg Department of Distributed Systems Prof. Dr. P. Tran-Gia Challenges of (P2P-based) Scalable Multicast in Infrastructure-based Mobile Networks K. Tutschku tutschku@informatik.uni-wuerzburg.de Workshop on Peer-to-Peer Multicasting (P2PM 2007) Las Vegas, 11. Januar 2007.

2. University of Würzburg K. Tutschku Conflicts  Radio capacity is limited vs. nodes/peers assume almost no restriction  overload  Radio links are asymmetrical  high heterogeneity of nodes/peers  Device mobility and short on-lines  high churn rate  Hierarchical architecture vs. dynamic overlays  topology might not match  Infrastructure is asset  resource management by operators needed

3. University of Würzburg K. Tutschku Solutions?  What architecture is needed?  Centralized?  Decentralized?  Hybrid?  What about self-organization?  Tuning parameter for degree of decentralization?  Multiple objectives?  How to address mobility?  Direct routing (e.g. ad hoc routing protocols) or indirect routing (e.g. MobileIP)?