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Author:Sannikka, Mikko
Title:Palvelunlaatu langattomissa lähiverkoissa
Quality of Service in wireless local area networks
Publication type:Master's thesis
Publication year:2009
Pages:104      Language:   fin
Department/School:Elektroniikan, tietoliikenteen ja automaation tiedekunta
Main subject:Tietoverkkotekniikka   (S-38)
Supervisor:Kilkki, Kalevi
Instructor:Hirsmäki, Vesa
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203071313
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.

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Location:P1 Ark S80     | Archive
Keywords:VoWLAN
QoE
QoS
SLA
SLM
VoWLAN
QoE
QoS
SLA
SLM
Abstract (eng):The amount of critical traffic over wireless networks is growing rapidly.
This thesis focuses on IEEE 802.11 standard and its Wireless Local Area Network (WLAN) technologies.
Besides the technology, Quality of Service (QoS) and important factors behind that were examined.
In addition Service Level Management (SLM) and Service Level Agreements (SLA), key concepts related to achieving QoS targets, were studied.
This thesis examines the QoS in WLANs focusing especially in critical traffic.
The results of literature study were used for measurement in a customer project.

Practical measurements were conducted using Noval Networks' approach and measurement system.
The measurements itself were carried out in the city of Salo, one of Noval Networks' customer.
The target for the project was to find out the quality of Salo's health center's wireless network and also to find out if the critical traffic will transfer over WLANs without problems.
The results were used to evaluate the needs for WLANs while using quality-critical traffic.
The delays and packet losses of Salo's WLAN network seemed to be very low and network suits fine also for critical traffic.
Abstract (fin): Kriittisen liikenteen määrä myös langattoman verkon yli on kasvamassa.
Tässä työssä tutkittiin IEEE 802.11 -standardin mukaisia langattomia lähiverkkotekniikoita (WLAN, Wireless Local Area Network) sekä langattomien lähiverkkojen palvelunlaatua.
Lisäksi perehdyttiin palvelunlaadun toteutumiseen keskeisesti liittyviin käsitteisiin palvelutasonhallinta (SLM, Service Level Management) sekä palvelutasosopimukset (SLA, Service Level Agreement).
Langattomien lähiverkkojen palvelunlaatua tutkittiin keskittymällä erityisesti kriittisen liikenteen kuljetukseen.
Kirjallisuustutkimusta ja sen tuloksia käytettiin hyödyksi asiakasprojektina toteutetuissa mittauksissa.

Mittaukset toteutettiin Noval Networksin toimintatapaa ja mittausjärjestelmää apuna käyttäen Salon kaupungin verkkoon tehdyillä laatumittauksilla.
Mittausten avulla selvitettiin pääterveyskeskuksen langattoman verkon laatua ja samalla todennettiin, miten kriittinen liikenne kulkee langattoman lähiverkon yli.
Tulosten perusteella arvioitiin yleisellä tasolla vaatimuksia langattomalle lähiverkolle kriittisen liikenteen kuljetuksen osalta.
Verkon viiveet sekä pakettihävikit osoittautuivat erittäin mataliksi ja langattoman verkon todettiin soveltuvan hyvin myös kriittiselle liikenteelle.
ED:2009-10-07
INSSI record number: 38437
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