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A Study on Mobile P2P Systems

A Study on Mobile P2P Systems. Hongyu Li. Outline. Introduction Characteristics of P2P Architecture Mobile P2P Applications Conclusion. Introduction. P2P content downloading activity becomes more and more popular.

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A Study on Mobile P2P Systems

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  1. A Study on Mobile P2P Systems Hongyu Li

  2. Outline • Introduction • Characteristics of P2P • Architecture • Mobile P2P Applications • Conclusion

  3. Introduction • P2P content downloading activity becomes more and more popular. • Mobile computing has emerged as one of the leading technologies in the 21st century. • Combination of P2P systems and ad-hoc networks allows for the creation of highly dynamic, self-organizing, mobile P2P systems.

  4. Introduction • What is Mobile P2P ”A type of network in which mobile nodes can connect to other nodes via short-range wireless technologies such as IEEE 802.11, Bluetooth, or Ultra Wide Band (UWB) when needed.”

  5. Characteristics • Fully decentralized:all peers are equally important within the network. • Highly dynamic, unpredictable: mobile hosts move frequently and independently of one another. • Self-organizing: a mobile P2P system constantly adjusts itself by discovering new communication links.

  6. Characteristics • Limited peer-to-peer communication throughput: constrained by the wireless bandwidth, the channel contention, and the limited connection time. • Need incentive for both information supplier and information propagators: mobile peer-to-peer networks heavily relies on cooperation among users.

  7. Architecture Most common P2P models: • Centralized model – “hybrid P2P” • Decentralized but unstructured model – “pure P2P” • Decentralized and structured model • Semi-Centralized model

  8. Architecture • The eDonkey approach (Still ongoing)

  9. Architecture Different routing Protocols: • Broadcast over broadcast: only works temporarily for small MANET. • Broadcast : not suitable for large networks. • DHT over broadcast: complex to implement.

  10. Mobile P2P Applications • Proem • First documented system for mobile P2P. • an middleware platform that provides a complete solution for developing and deploying P2P applications for mobile ad-hoc networks. • http://wearables.cs.uoregon.edu/proem

  11. Mobile P2P Applications • Proem

  12. Mobile P2P Applications • JXME • a light version of JXTA for mobile devices. • provide JXTA compatible functionality’s on contained devices using CLDC and MIDP. • JXME uses relays to connect lightweight mobile peers to the rest of the JXTA network.

  13. Mobile P2P Applications • JXME http://jxme.jxta.org

  14. Conclusion • Challenges • Network Availability • Mobile device limitation • Peer and Resource Discovery • Data Sharing and Synchronization • Security threats • Privacy

  15. Conclusion • Future • The development of mobile P2P system is still in its early stage. • With technology development, we could expect P2P services to be offered by mobile operators in the next few years.

  16. Thank You !

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