Audio and Video Streaming

over MANET

Salman Shahid Mr. Nauman Shamim

salman.sam@live.com nauman.shamim.xp@gmail.com

Pakistan Institute of Engineering and Applied Sciences

Department of Computer and Information Sciences

Introduction/Abstract: Mobile Ad hoc

Networks (MANETs) are self-configuring

and self-healing networks primarily used by

defense forces and civil administration to

achieve uninterrupted communication

support during emergency situations along

with increased redundancy. MANETs do not

require any pre-existing infrastructure or

centralized control. As the nodes

constituting the network are mobile, with

wireless links between them, the network

topology can be very dynamic. Due to

mobility of nodes, the performance of a

MANET is dependent upon the capability of

the routing protocol to adapt to the

frequently changing network topology. Thus

special types of routing protocols are

developed for MANETs: reactive and

proactive. Ad hoc On-Demand Distance

Vector (AODV) and Optimized Link State

Routing (OLSR) are two reactive and

proactive protocols that are commonly used

for establishing MANETs. In this project, a

multi-hop MANET was implemented using

five Linux based WRT-54GL wireless

routers executing the OLSR protocol. An

extra node was placed between the source

and destination nodes to evaluate the

redundancy of the network. VoIP

communication was established and tested

under static and mobile scenarios and

communication efficiency was evaluated.

Objective

The goal of this project is to develop a

mobile ad-hoc wireless network that can

effectively support voice and data traffic

over multiple wireless hops.

Methodology

Different routing protocols for ad hoc

networks were studied and OLSR was

selected based upon its high

performance.

OLSR was implemented on five Linux

based WRT-54GL wireless routers.

Multi-hop configuration was established

using Iptables to simulate a mobile

topology.

Appropriate software was selected and

installed to enable voice and video

transmission.

Analysis

The communication efficiency involving

Goodput, latency, end-to-end packet loss

and jitter was extensively evaluated using

the Iperf bandwidth tester and Ping

application over different number of

wireless hops.

2

Conclusion

The results obtained from the

performance analysis indicate that the

network established is completely

capable of VoIP communication over

multiple numbers of wireless hops.

The network is highly reliable with

alternate route selection within three

seconds of route severing.

Figure: 1 Test-bed Network Topology

Figure 2: Project Plan Flow Chart

Future Work

The performance of other protocols can be

compared with that of OLSR and a better

network solution can be obtained. For example

AODV can be cross compiled to run on the

WRT-54GL routers and its performance can be

compared with that of OLSR. Also the newer

versions of OLSR (Freifunk) are also available

which should be evaluated in a real test bed

environment.

We have tested the redundancy of the MANET

in an emulated multi-hop environment i.e. we

blocked some of the nodes for specific routers

using MAC layer filtering. The MANET should

be tested in real life by actually physically

moving the routers out of the radio range of each

other and then monitoring the route switching

time. To support mobility, each router can be

provided with a portable 12 volt battery.

References

[1]. Lei Chen and Wendi Heinzelman

“Network Architecture to Support QoS

in Mobile Ad Hoc Networks”, pp 1-2, June

2004.

[2]. VoIP-[online] available:

http://www.midlandtelecom.com/VOIP_Des

cription.aspx

[3]. Netfilter-[online] available:

http://www.netfilter.org

[4]. Freifunk-[online] available:

http://freifunk.net/wiki/FreifunkFirmwareEn

glish.

[5]. Linksys-[online] available:

http://www.linksys.com.

[6]. Y. Ge, T. Kunz, and L. Lamont,

“Quality of Service Routingin Ad-hoc

Networks Using OLSR,” in Proceeding of

the 36th Hawii International Conference on

System Science, 2003.

[7]. Iperf-[online] available:

http://dast.nlanr.net/Projects/Iperf/

Technical Support For any help about thesis, please contact

me via email: salman.sam@live.com

Studying MANETs and

Routing Protocols

Understanding Linux OS

Installing OLSR on WRT-54GL

routers

Installing AODV on LAN

VoIP Installation

Setting up a Multi hop Test

bed configuration

Performance Evaluation

Network Monitoring