analyzing the performance of real-time applications in wireless

8/3/2019 Analyzing the Performance of Real-Time Applications in Wireless

1/15

SITI NUR ASNENE BT TAJUDIN

52208209429

FYP Supervisor: MADAM SHAHRIZAD


2/15

The main target of this project was to

analyzing the performance of real-time

application, which is video streaming, over

Wireless Mesh Network (WMN).

The development will be done by using

simulation tools to test the performance of

real-time applications in WMN.


3/15

The overall objectives of the project are:

To build the mesh network in simulator.

To run the real-time applications.

Analyze the performance of application that

is running in WMN.


4/15

Using simulation environment

Focus on real-time applications

Build WLAN using simulation

Build mesh network

Run the application

Doing some performance monitoring on both

Analyze the result


5/15

Multimediatraffic performancein WirelessMesh Network (WMN)

The project presented their experimental study

of multimedia traffic performance in mesh

network.Th

eyh

ave a testbed of 25 nodesequipped with IEEE 802.11b wireless radio and

the nodes were distributed on five floors of some

building. Apart from wireless interface, each

node has a Ethernet interface to synchronize

time. They suggested two tools for measuringthe performance:

a) Link quality tool

b) Time synchronization tool.


6/15

VoIP over WirelessMesh Network (WMN)

VoIP has become killer application in WMNs.

To date few research work has been carried

out to investigate the performance of VOIPover WMNs, and many challenging issues

remain to be resolved. The project discussed

some of the challenges that are faced by

high rate VoIP traffic. They have designedand tested a distributed multichannel TDMA

MAC as the ultimate solutions to major

legacy MAC problems.


7/15

Bandwidth

-High bandwidth requirements.

-If shared among multiple clients using unicast

communications, it could result in network

resources starvation.

-Need a higher bandwidth and higher reliability

connection than that provided by a single link in

current or emerging wireless networks.

-It is possible to establish multiple paths

between a source and a destination, which

provides an extra degree in designing video

coding and transport schemes.


8/15

Packet Lossanddelay-jitter problem

-Packets that arrive late are considered lost and discarded.Packet losses induce distortion in the reconstructed videoand degrade the quality of the video. Thus it is desirable

to reduce losses.-Packet losses and network congestion cause largevariations in the one-way delay experienced by packets ofa flow.

-Standard technique to smooth out this jitter is to employ

a playback buffer that adds some delay between actualstreaming and playback time. Packets received ahead intime are buffered before being played back.

-Theoretically by having an infinite playback buffer, jittercan be completely eliminated. But due to the nature of

live streaming, it is desirable to have low delay beforeviewing. The solution is to employ as little playback delayas possible.

-Lower delay also implies lower buffer size requirements.In order for video to be played back without disruption,the playback buffer should never be empty.


9/15

Simulation models cannot cover allinfluences of the operating system, the

network stack and the physical environment

due to complexity constraints.

Transition from real-time applications to the

deployable simulation model solution

remains challenging.

Sometimes it is difficult to interpret the

simulation results because the result is

regardless obstruction.


10/15

To handle this project, research on the web pages, articles,

journals and books has been made.

Review 1

(This is the journal about Multimedia over Wireless MeshNetworks: Results from a Real Testbed Evaluation from TheSixth Annual Mediterranean Ad Hoc Networking WorkShop,Corfu, Greece, June 12-15, 2007)

Review 2

(This is the journal about Multimedia over Wireless MeshNetworks from Yogesh Ashok Powar-Department of ComputerScience and Engineering, Indian Institute of Technology,Bombay)

Review 3

(This is the web article about Delivering Video over WirelessMesh Network from http://www.belairnetworks.com)


11/15

This project use the V-Shaped Model for themethodology.


12/15


13/15


14/15


15/15

The author really hope that the mesh

network simulation can provide a clear

structure and its extensive.

Modelling base and the ongoing developmentof the integrated simulation environment can

motivate the author to contribute to the

maturity of the mesh network domain from a

simulation perspective.

analyzing the performance of real-time applications in wireless

Documents