Mobile P2P - Creating a
mobile file-sharing
environment
Agenda
Research questions What is mobile P2P
Solution: Full mobile phone based P2P Solution: Computer aided mobile P2P
Solution: The future of mobile P2P: JXTA Threats to mobile P2P
Research questions
How can file sharing be realized in
mobile networks today?
How will the upcoming 3G-networks
support file sharing?
What are the threats for file sharing
Mobile P2P?
Transferring data from one mobile
phone to another
Mobile phone and network limit the
possibilities of mobile P2P
Low efficiency (CPU and memory) Low bandwidth
Full mobile P2P in 2/2.5G
In 2/2.5 there are limitations that are
impossible to overcome:
Operators do not allow to see mobile phones IP
address
Operators control data traffic including ports
suitable for them
Network does not offer any way to sustain
active connection in all situations
Voice and data can not be transferred
A solution to 2/2.5 P2P: MMS
MMS could be used as a way of
sending data from one mobile note to another. However there are problems:
How to know who has the information you need?
MMS size is limited
A solution to 2/2.5 P2P: MMS
We have to have a
server that keeps a record of MSISDN
number and the data that can be found from that number
Downloader asks the
A better solution: computer
aided P2P
All the major limitations could be
overcome if the mobile phone would be connected to a computer which has P2P software
We would only need a software to
communicate between the computer and mobile phone:
Computer aided P2P: short
distance
Within short distance we would not have
true mobile P2P:
A better solution would be to control
Computer aided mobile P2P:
remotely
For example over http we could
control the fixed network peer by
Computer aided mobile P2P:
eMule
1. login 3. download
to computer
2. search 4. download to phone
eMule is a working solution but
JXTA – Tomorrow’s P2P solution
Background
Software Architecture Network Architecture Protocols
JXTA - Background
started by Sun Microsystems in 2001 Open Source, royalty free licence
platform independent (mobile phone ->) architecture and protocols
uses HTTP, TCP/IP and XML
builds virtual ad-hoc network on top of
JXTA – Network Architecture
JXTA - Protocols
Core Specification Protocols
Peer Resolver Protocol (PRP)
Endpoint Routing Protocol (ERP)
Standard Service Protocols
Rendezvous Protocol (RVP)
JXTA – Example Applications
JXTA Shell
command line interface
enables publishing, searching,
messaging, discovering, piping and more
MyJXTA
open soure example application
JXTA – JXME (JXTA for J2ME)
JXTA – JXME (JXTA for J2ME)
Threats to mobile P2P
In 3G true mobile P2P is possible due to high bandwidth, efficient mobile phones and simultaneous voice and data
capability
-> But will the operators allow P2P
software since is would lead to the loss of revenues?
Conclusions
2/2.5G is not ready for mobile P2P.
However with the aid of computer
killer applications could be developed
3G does not have technical restrictions
