A Study on Mobile P2P Systems

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A Study on Mobile P2P Systems

• Hongyu Li

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Outline

• Introduction
• Characteristics of P2P
• Architecture
• Mobile P2P Applications
• Conclusion

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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.

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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.

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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.

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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.

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Architecture

• Most common P2P models
• Centralized model hybrid P2P
• Decentralized but unstructured model pure P2P
• Decentralized and structured model
• Semi-Centralized model

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Architecture

• The eDonkey approach (Still ongoing)

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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.

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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

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Mobile P2P Applications

• Proem

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Mobile P2P Applications

• JXME
• a light version of JXTA for mobile devices.
• provide JXTA compatible functionalitys on
  contained devices using CLDC and MIDP.
• JXME uses relays to connect lightweight mobile
  peers to the rest of the JXTA network.

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Mobile P2P Applications

• JXME
• http//jxme.jxta.org

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Conclusion

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

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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.

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• Thank You !