P2P file sharing over GPRS network using Motorola RAZR2

P2P File Sharing over GPRS Networks Presentation By- Ritul Sonania 2005K124416 BITS-Pilani Motorola India Electronics Ltd. Bangalore

Contents

Introduction

Peer to Peer vs. Client Server architecture

Platforms for P2P and existing applications

Key drivers for peer to peer sharing

Benefits

Key issues & requirements

Application Implementation

Competing Solutions

Conclusion

Introduction

It is a method of sharing files between the peer mobile phones

Pull file from peer mobile phone

Preview of files shared without downloading

PC like File sharing experience

Peer to Peer

Peer in a network architecture are termed as the data terminals

P2P network is a network that relies on the computing power and bandwidth of the participating in the network rather than concentrating on few servers .

Client server architecture

Server well connected to the

“ center” of the Internet

Servers carries out critical tasks

Clients only talk to server

Client server vs. P2P – Video sharing Example YouTube vs. Torrent

Advantages

Client can disconnect after upload

Uploader needs little bandwidth

Other users can find the file easily

(just use search on server webpage)

Disadvantages

Server may not accept file or remove it later

(according to content policy)

Whole system depends on the server

Server storage and bandwidth are expensive!

Client server vs. P2P – Video sharing Example contd.(2)

Advantages

Does not depend on a central server

Bandwidth shared across nodes

(downloaders also act as uploaders)

High scalability, low cost

Disadvantages

Sender must remain on-line to

guarantee file availability

Content is more difficult to find

(downloaders must find .torrent file)

Freeloaders cheat in order to

download without uploading

Peer to Peer on mobile device

Available popular platforms -

Bluetooth (~ 10m, 2.48 GHz, <1Mbps)

IrDA (LOS, old method, 115.2kbps)

WiFi(Separate network needed, <7.2 Mbps downlink)

GPRS (easily accessible, <384kbps ,cheap)

Existing popular applications -

For Desktops -

DC++ (Windows, FTP)

Torrent (windows, mac)

For mobile devices

PeerBox ( Symbian,J2ME, GPRS)

Social networking

File sharing

Key Drivers for peer sharing

Growth of Social networking and peer groups among the youth.

Integrated Camera ,FM, Voice recorder and high onboard and card storage

Lack of simple peer file sharing application

Less growth in GPRS ARPU for operators

Number of Users in India in March,2007 –

Fixed Internet – 9.27 million

Mobile Internet (GPRS) – 31.3 million

Benefits

End User-

User generated data sharing

Offline file sharing is allowed

Use service only when in need

Cheap and easy

Benefits (contd.)

To operators-

No storage required on networks

Increased GPRS ARPU

Infrastructure need not to be changed

Advertisement opportunity

Key issues and requirements of the application

Technical Constraints

Memory size

CPU performance

Screen size

Battery capacity

Special Needs of Mobile Environment

Support for various access networks

Operator control on DRM content

Feasible bandwidth pricing

Key issues Contd.

User Requirements

Quick response times

Rapid downloads

Security ( how to verify the peers )

Implementation

Application is built and tested on Linux Java based Lido (RAZR V8)

The software application comprised of –

UI application (P2P App)

Connectivity application

P2P App Conn App Sender Receiver P2P App Conn App Sender Receiver No. 9901566118 IP: 10.154.56.39 IP: 10.154.56.102 No. 9972365845 Peer 1 invokes P2P App to check what Peer 2 has shared Control Channel : Demand shared file list using GET_LIST_ID Control Channel : Returned file list , sent RET_LIST_ID Peer 1 now can see the list of files Chooses the file to download Control Channel : Request to download the file on the control channel and send DOWNLOAD_FILE_ID message Retrieved message ID , match the request file from list. Initiate Data Channel : look for data on the data channel and invoke receiver method. Established Data Channel : send the data on the data channel using sender method. File download in progress…. File download Complete Control Channel : inform file download completeDOWNLOAD COMPLETE_ID P2P Connection establishment

Competing solutions Network Storage Local copy of data Network changes Off-line share Feature No Yes Yes Not needed Needed Needed No changes Need MMSC and Gateway IM Server Yes No No P2P Share MMS Instant Messaging

Conclusion

P2P file sharing offers new functionality to the mobile phones. The user generated data now can be shared on the go but simultaneously it is a threat to the copyright multimedia content.

Thank You

References