Apr 8, 2010

Adapting BitTorrent to wireless ad hoc networks

By : Mohamed Karim Sbai, Chadi Barakat, Jaeyoung Choi,

Anwar AlHamra and Thierry Turletti


Abstract:

BitTorrent is one of the Internet's most efficient content distribution protocols. It is known to perform very well over the wired Internet where end-to-end performance is almost guaranteed. However, in wireless ad hoc networks, many constraints appear as the scarcity of resources and their shared nature, which make running BitTorrent with its default configuration not lead to best performances. To these constraints it adds the fact that peers are both routers and end-users and that TCP-performance drops seriously with the number of hops. We show in this work that the neighbor selection mechanism in BitTorrent plays an important role in determining the performance of the protocol when deployed over a wireless ad hoc network. It is no longer efficient to choose and treat with peers independently of their location. A first solution is to limit the scope of the neighborhood. In this case, TCP connections are fast but there is no more diversity of pieces in the network: pieces propagate in a unique direction from the seed to distant peers. This prohibits peers from reciprocating data and leads to low sharing ratios and suboptimal utilization of network resources. To recover from these impairments, we propose an enhancement to BitTorrent which aims to minimize the time to download the content and at the same time to enforce cooperation among peers. Our solution considers a restricted neighborhood to reduce routing overhead and to improve throughput, while establishing few connections to remote peers to improve diversity of pieces. With the help of extensive NS-2 simulations, we show that these enhancements to BitTorrent significantly improve the file completion time while fully profiting from the incentives implemented in BitTorrent to enforce fair sharing.

Paper:

Mohamed Karim Sbai, Chadi Barakat, Jaeyoung Choi, Anwar Al Hamra, Thierry Turletti, "Adapting BitTorrent to wireless ad hoc networks" to appear in proceedings of 7th International conference on ad hoc networks and wireless 2008 (AD-HOC NOW), Sophia Antipolis, France, September 2008. download

NS-2 Simulator code and scripts:

Click here to download code.

5 comments:

krish said...

i am doing project in WSN
i want tcl coding in WSN with clusterhead and base station formed.
I will do a project in dynamic emroute filtering scheme in WSN
Iin module1 i want to do a simple simulation env with formation of cluster and base station and transfer of packets from sensing node to BS.
plz help me
my email:krishnamoorthy98@gmail.com

Amir Omidi said...

hi my dear friend
i have many question in ns.


1) how i can simulate a webserver (how code or command or class & objects?)

2) how i can install gnuplot?
- how i can show the output analyze file, in gnuplot? (how code or command?)

3) if i use SCTP Protocol&Agent,how should i do? (how code or command?)

Helot_Of_God@Yahoo.com
very thanks...

Amir Omidi said...

hi my dear friend
i have many question in ns.


1) how i can simulate a webserver (how code or command or class & objects?)

2) how i can install gnuplot?
- how i can show the output analyze file, in gnuplot? (how code or command?)

3) if i use SCTP Protocol&Agent,how should i do? (how code or command?)

helot_of_god@yahoo.com
very thanks...

aziz said...

thanks

sreedevi said...

i am doing project in WSN
i want tcl coding in WSN for active monitoring with code in sensor nodes as well as in base station .
I want to develop an active wsn debugger
plz help me
my email:sreedevi.prabin@gmail.com