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Author:Julnipitawong, Phakphum
Title:Quality of service in VoIP over WLANs
Publication type:Master's thesis
Publication year:2008
Pages:(12) + 108      Language:   eng
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Tietoliikennetekniikka   (S-72)
Supervisor:Jäntti, Riku
Instructor:Ruttik, Kalle
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark S80     | Archive
Keywords:VoIP
IEEE 802.11
QoS
delay
Jitter
packet loss
Mean Opinion Score
Abstract (eng): Voice over Internet Protocol (VoIP) uses the existing data networks to support voice services.
It has abroad appeal in that it is currently unregulated and calls can be placed fixed fee to any part of the globe.
The integration of voice traffic with data traffic opens up opportunities for new revenue stream for Internet Service Providers.

Therefore, it have to deal with both voice and data traffic.
In this thesis, it assesses the suitability of IEEE 802.11 networks to carry real-time voice traffic using Internet Protocol (IP) network.

Thesis works were performed over IEEE 802.11 Wireless LANs in both ad-hoc and infrastructure modes and focused on the four major VoIP Quality of Service metrics: Packet loss, Delay time, Jitter, and Mean Opinion Score (MOS).
The environmental factors such as the attenuation and the different radio channel models between Sender and Receiver nodes were recorded wherever possible.
Furthermore, the effect of TCP traffic competing was also analyzed.

In this thesis found that IEEE 802.11 networks can support the requirements of real-time voice communication when there is clear to the peer node or when communicating nodes are close.
Attenuation and Radio channel models proved to cause packet loss and delay time, whilst TCP traffic competing increased Delay time leading to worse quality.
All experimental data was recorded in a repository of laboratory for further study.
ED:2009-01-23
INSSI record number: 36695
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