This document outlines a peer-to-peer (P2P) communication framework developed for the Android platform. It discusses the motivation for developing an alternative to traditional mobile networks that has lower infrastructure costs. The framework uses a modified Gnutella network design over Bluetooth due to its API support and no need for rooting. Key features include being open-source, not requiring a centralized server, and including packet routing and flow control. Performance testing showed an average maximum throughput of 54kbps. Future work could focus on improving hardware support and adding security.

1. P2P Communication
Framework on Android
Platform
By Liu Tianwei

2. Outline
• Introduction
• Motivation + Proposed Solutions.
• Recap of work done
• Design Decision and Limitation
• Implementation result and performance
• Demo
• Limitation and Future Work

3. Introduction

4. Problem
• Need for better mobile network
infrastructure.
• Traditional Mobile Network are not
designed to scale fast and cheaply.

5. Motivation
• Provide an alternatives to traditional mobile
network infrastructure.
• Lower the infrastructure cost for each
additional devices added to the network.

6. Propose Solution
• A P2P communication framework on
mobile platform.
• Open Source to allow developers to easily
integrate with their existing source code.

8. Recap of work done
• Server Implementation
• Literature Reviews
• Geoscribe Webservice implementation

9. Design Decisions and
Limitations
• Platform
• Hardware Choices and Limitation
• Network Design
• AutoConnection

10. Platform
• Open Source
• Large Developer Community
• Comprehensive Java Apis.

11. Network Design
Designed Considered:
• Centralized Index
• Gnutella (Query Flooding)
• Hierarchical Overlay
• Distributed Hash Table

12. Centralized Index

13. Gnutella

14. Hierarchical Overlay

15. Distributed Hash Table
• A distributed database over large number
of peers that supported query&update
operations.
• Information stored in database in the
form of key value pairs.
• Peers query database with key

16. Network Design
Modified Gnutella network.
• Easy to implement.
• Bluetooth hardware limitations.
• Server-less implementation.

17. Hardware Choices and
Limitations
Androids Offers:
• Bluetooth
• Wireless - Fidelity

18. Bluetooth

19. Bluetooth

20. Bluetooth

21. Bluetooth

22. Bluetooth

23. Wireless Fidelity
• IEEE 802.11 Standard (b/g/n)
• via router
• Direct device to device (ad-hoc)

24. Hardware Choices and
Limitations
Focused on Bluetooth
• Bluetooth has well defined apis
• Wi-Fi ad-hoc mode not supported on
android.
• rooting is required for Wi-Fi ad-hoc.

25. Hardware Choices and
Limitations

26. Hardware Choices and
Limitations

27. AutoConnection
• Experimental feature to overcome in-ability
to stay always discoverable.
• Centralized Geo-location indexing server.
• Maintain Bluetooth scatter-net topology.

28. Implementation Result
and Performance
• Framework Overview
• Key Features
• Performance Metrics

29. Framework Overview

30. Framework Overview
Android Interface Definition Language(AIDL)

31. Framework Overview
Use Cases:
• Ad-hoc gaming network
• Instant Messaging Application
• File Sharing
• Video Sharing
• Internet sharing
• Geo-location Triangulations, etcs

32. Key Features
• Open-Source
• No Rooting Required
• Packet Routing
• No need for Centralized Index Server
• Flow Control / Traffic Policing
• Auto Connections

33. Performance Metrics
Average Maximum throughput : 54Kbps

34. Demo

35. Limitations of
Framework
• Bluetooth chipset on Androids phones.
• Pairing between devices
• Lack of security
• Dependency on Geo-Location Indexing
Server(AutoConnection)

36. Future works
• Wi-Fi Ad-hoc communication.
• Server-less implementation
• Optimization
• Security

37. Q&A