PeertoPeer Programming with Wireless Devices Master Thesis in ICT

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Peer-to-Peer Programming with Wireless Devices
Master Thesis in ICT

• Tore Mørkved
• 19 August 2005

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Outline

• Objectives
• Limitations
• Technology
• Proposed System Design
• Prototype Application
• Test Results
• Future Work
• Conclusions

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Objectives

• Build a P2P system consisting of wireless devices
  only
• How will device specific constraints affect the
  P2P design?
• How will the network react to dynamic
  disconnections?
• Prototype based on P2P Design
• Created from a proposed emergency scenario
• Prototype testing

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Limitations

• Limited testing environment
• System will not be tested in a large scale
  environment
• Non-functional requirements
• Stability, security and usability not prioritised

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Technology (1) - Mobile P2P

• Traditional Peer-to-Peer Architecture
• Decentralized computing power
• Fixed network
• Mobile Peer-to-Peer
• The Mobile Advantage
• Exploding technology

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Technology (2) - JXTA

• Short for Juxtaposed, meaning side by side
• Community effort to create a P2P standard
• Interoperability
• Platform independence
• Ubiquity
• A set of open P2P protocols

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Technology (3) - JXTA for J2ME (JXME)

• Lightweight version of JXTA
• A P2P API for mobile devices with MIDP profile
  and CLDC configuration
• Enables constrained wireless devices to
  participate in the JXTA network

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System Design (1)
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System Design (2)

• Mobile Peer
• Uses the JXME API
• Minimal P2P responsibility
• JXME Proxy Service
• Relays Messages
• Routes Messages
• Converts Messages

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P2P Operations

• Network Establishment
• Peer Discovery
• Advertising Resources
• Sharing Large Files

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Prototype (1)

• Based on the proposed P2P Design
• Medical Emergency and Cooporation System
• To assist emergency personnel in disaster a
  scenario
• Reports emergencies and maps personnel
• Sharing of visual information between Personnel

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Prototype User Interface (1)

• Connect to network

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Prototype User Interface (2)

• Report Emergency

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Network Test

• Local PC ? Intranet ? Internet
• Increasing number of Peers and Proxy Services

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Network Test Results

• The system is scalable and works over NATs and
  firewalls
• Peers are discovered and communicates, but some
  messages are randomly lost

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Large File Transfer

• JXTA specification limits the messagesize
• 62kB
• Image data larger than segment limit are
  segmented and re-assembled at receiver side
• Transfer performance depends on segment size.

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File Transfer Results
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Future Work

• Improve the JXME Proxy Service implementation
• Test prototype with real mobile devices
• Enable camera
• Use GPS or other Location based technology
• Explore JXME proxyless when available

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Conclusions

• Mobile P2P is promising and gives us new ways to
  communicate, share and collaborate
• Disaster scenarios
• Medical networks
• Play mobile multiplayer games
• Foundation for further research and development
• Mobile devices still have constraints
• Best P2P solution involves more powerful peers to
  act as a proxy and relay messages.
• Gives both the advantages of a fixed P2P network
  and the mobility of a wireless network.
• JXME technology still under development, and so
  are mobile devices.
• Will grow with the 3G network and the ever
  improving computing power of mobile devices.