Reputation system for user-generated podcasting under community based mobility model

ABSTRACT

A user-generated podcasting service over mobile opportunistic networks can facilitate the user generated content dissemination while humans are on the move. However, in such a distributed and dynamic network environment, the design of efficient content forwarding and cache management schemes are challenging due to the lack of global podcast channel popularity information at each individual node. We design a distributed reputation system at each node for estimating the global channel popularity information which is significant for forwarding and cache management decision. Our simulation result shows that, compare to History-based rank scheme, our reputation system can significantly improve system performance under Community-based Random Way-Point (C-RWP) mobility model and localized channel popularity distribution. The performance evaluation under three C-RWP scenarios shows that the reputation system brings more performance gain when channel popularity distribution becomes more localized and node mobility become more localized.

REFERENCES

• 1: Vincent Lenders, Martin May, and Gunnar Karlsson. Wireless Ad Hoc Podcasting. In Proceedings of IEEE SECON, San Diego, CA, June 2007.
• 2: http://www.youtube.com/
• 3: Sonja Buchegger, Jean-Yves Le Boudec. A Robust Reputation System for P2P and Mobile Ad-hoc Networks. In Proceedings of Second Workshop on the Economics of Peer-to-Peer Systems, Harward University, June 2004.
• 4: Mirco Musolesi , Cecilia Mascolo, Designing mobility models based on social network theory, ACM SIGMOBILE Mobile Computing and Communications Review, v.11 n.3, July 2007 [doi>10.1145/1317425.1317433]
• 5: Michael Zink, Kyoungwon Suh, Yu Gu and Jim Kurose, Watch Global, Cache Local: YouTube Network Traces at a Campus Network - Measurements and Implications", In Proceedings of 2008 IEEE MMCN, San Jose, CA, January 2008
• 6: Liang Hu, Jean-Yves Le Boudec, Reputation System for wireless ad-hoc podcasting. Technical Report, Technical University of Denmark, July 2008

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.4 Distributed Systems

Additional Classification:
  I. Computing Methodologies
  I.6 SIMULATION AND MODELING

General Terms:
Algorithms, Design, Performance

Keywords:
ad-hoc podcasting, bayesian framework, reputation system, user generated service