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LYU9903 QoS Schemes in Wireless Networks. Ho Pun Mo Matchman Ng Maggie Supervised by Prof. Michael Lyu. Outline. What is Wireless LAN? Why Wireless? How to Wireless? Examples of Wireless device Applications of Wireless LAN Advantages and Disadvantages of Wireless LAN What is QoS

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Lyu9903 qos schemes in wireless networks l.jpg

LYU9903QoS Schemes in Wireless Networks

Ho Pun Mo Matchman

Ng Maggie

Supervised by Prof. Michael Lyu


Outline l.jpg
Outline

  • What is Wireless LAN?

  • Why Wireless?

  • How to Wireless?

  • Examples of Wireless device

  • Applications of Wireless LAN

  • Advantages and Disadvantages of Wireless LAN

  • What is QoS

  • Why QoS is needed in Wireless?

  • QoS Schmemes

  • Application for QoS Scheme

  • Measurement of QoS Scheme

  • Future work


1 what is wireless lan l.jpg
1 What is Wireless LAN?

  • A flexible data communications system

  • As an extension to/alternative for wired LAN

  • Using radio frequency (RF) technologies

  • Transmit and receive data over the air


2 why wireless l.jpg
2 Why Wireless?

  • Mobility

  • Installation speed and simplicity

  • Installation flexibility

  • Reduced cost-of-ownership

  • Scalability


3 how to wireless l.jpg
3 How to Wireless?

  • Equipment needed

  • Configuration


3 1 equipment needed l.jpg
3.1 Equipment needed

  • Access Points

  • Adapter cards


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3.2.1 Configuration - Peer-to-peer

  • A peer-to-peer network

  • Access to resources of each other, but not a central server


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3.2.2 Configuration - An Access Point

  • Extend the range of an ad hoc network

  • Doubling range at which the devices can communicate

  • Access to resources of both server and clients


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3.2.3 Configuration - Multiple Access Points

  • Blanket the coverage area with overlapping cells

  • Enable roaming



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5 Applications of Wireless LAN

  • Health Care

  • Education and Research

  • Restaurant and Retail

  • Warehousing

  • Trading and Banking

  • Consulting and Sales


6 advantages disadvantages of wireless lan l.jpg
6 Advantages & Disadvantages of Wireless LAN

Advantages:

  • Inexpensive

  • Have enough bandwidth to handle office tasks

  • Do well in roaming

  • Flexible

  • Easy to install


6 advantages disadvantages of wireless lan13 l.jpg
6 Advantages & Disadvantages of Wireless LAN

Disadvantages:

  • Small bandwidth causes problems with multimedia transmission

  • Limit number of connected nodes

  • Limit range of coverage

  • Large battery consumptions

  • For infrared, line-of-sight may be needed


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7 What is QoS?

  • QoS is the collective effect of service performances which determine the degree of satisfaction of a user of the service.

  • QoS is the guarantee a network makes to an application in terms of providing a certain contracted level of service through out the application session.

  • QoS represents quantities like how fast can data be transferred, how much does the receiver have to wait, how correct is the received data likely to be, how much data is likely to be lost, etc.

  • ATM defines QoS as a collection of rate, latency, jitter loss ratio and error ratio.

  • QoS refers to the ability of a network to deliver time-bounded traffic types (e.g., realtime video or voice) with predictable latencies.


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8 Why QoS is needed in Wireless?

  • Growth of real-time multimedia applications

  • Wireless to be a trend


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9 QoS Schemes

  • Architecture

  • Implementation


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9.1 Architecture

  • A working network

  • Bandwidth reservation mechanism

  • Packet scheduling algorithm

  • Packet classifier


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9.2.1 Implementation - RSVP

  • ReSerVation Protocol

  • Reserving bandwidth along the path

  • Works with both IPv4 and IPv6


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9.2.2 Implementation - Packet Scheduler

  • FIFO

  • RED

  • CSZ

  • SFQ

  • TBF

  • TFQL

  • PRIO

  • CBQ


10 application for qos scheme l.jpg

Server

(store mp3 songs)

Reserve b/w for QoS

 

Client

(with mp3 player)

10 Application for QoS Scheme

MP3 player for demonstrating the use of QoS.


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10 Application for QoS Scheme

Interface of MP3 player:



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11 Measurement of QoS Scheme

No Qos

Qos

Compare the performance of transmitting FTP & MP3 by using Proxim.


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12 Future Work

  • Implementing Video on Demand in Wireless LAN

  • Measure the QoS of VOD


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THE END

Thank you!


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