WIRELESS NETWORKS
Midterm 30%
 Final 40%
 LAB 15%
 Assignment 15%


Text Book – Designing and Deploying 802.11n
Wireless Networks
 Jim
Geier (ciscopress)
W.lilakiatsakun
INTRODUCTION TO WIRELESS NETWORK
TOPICS

Introduction to Wireless Networks
 Wireless
LAN Markets and Applications
 Benefits of Wireless Networks
 Wireless Network Technologies
 Other Wireless Network Technologies
WIRELESS LAN MARKETS AND APPLICATIONS(1)

Retail – connection between devices (printer
/barcode) and computer system
WIRELESS LAN MARKETS AND APPLICATIONS(2)

Warehousing – Wireless Barcode system to
support CDC (Central Distributing Center)
WIRELESS LAN MARKETS AND APPLICATIONS(3)

Healthcare
WIRELESS LAN MARKETS AND APPLICATIONS(4)

Video Surveillance
WIRELESS LAN MARKETS AND APPLICATIONS(5)
What else have you thought of wireless applications ?
BENEFITS OF WIRELESS NETWORKS (1)

Mobility
 Can

move to anywhere
Solve some wire problems
 Connector
problems
 Cable Erosion

Install in Difficult-to-Wire Access
 Remote
Area
 Dangerous area
BENEFITS OF WIRELESS NETWORKS (2)
Reduced Installation Time
 Long-term Cost Saving
 Productivity Gain

DISAVANTAGES OF WIRELESS NETWORKS

Performance
 Low
Bandwidth
 High Error Rate

Security
 Broadcast

signal
Limited Power Consumption
 Operating
on battery
WIRELESS NETWORK TECHNOLOGIES (1)

IEEE 802.11 (WIFI)
WIRELESS NETWORK TECHNOLOGIES (2)

802.11a
 OFDM
(Orthogonal Frequency Division Multiplexing)
 5GHz Band
 54 Mbps

802.11b
 DSSS
(Direct Sequence Spread Spectrum)
 2.4GHz Band
 11 Mbps
WIRELESS NETWORK TECHNOLOGIES (3)

802.11g
 OFDM
(Orthogonal Frequency Division Multiplexing)
 Backward Compatible with 802.11b
 2.4GHz Band
 54 Mbps for 802.11g
 11 Mbps for 802.11b (RTS/CTS used for protection
mechanism when 802.11b client try to connect to
802.11b/g access point)
WIRELESS NETWORK TECHNOLOGIES (4)

802.11n
 MIMO
(Multiple Input Multiple Output)
 Channel bonding and Frame aggregation
 Support 2.4GHz and 5GHz
 Backward compatible with 802.11g and 802.11a
WI-FI CERTIFICATION (1)

Wi-Fi Alliance is an international, non-profit
organization focusing on the manufacturing,
marketing, and interoperability of 802.11 WLAN
products
WI-FI CERTIFICATION (2)

Wi-Fi alliance goals
1
Promote WIFI-certification worldwide by
encouraging manufacturers to follow standardized
802.11 processes in the development WLAN
products
 2 Market Wi-Fi certified product to customers in the
home, office and enterprise market
OTHER WIRELESS NETWORK TECHNOLOGIES (1)

IEEE 802.16 (WiMAX)
 High
Performance – offer data rate in the megabits
per second
 Medium to long-range operation – offer Kilo meters
in range
 Medium power – similar power requirement as WiFi
 High to very high cost – Hardwares is more
expensive than Wi-Fi
OTHER WIRELESS NETWORK TECHNOLOGIES (2)

WiMAX Standard
802.16d – Only fixed wireless
 802.16e – Fixed and mobile wireless
 802.16m – under development (speed up to 1Gbps)
 WiBro – Based on 802.16e and has functionality
defined by Mobile WiMAX


WiMAX Frequency
Licensed – 2.5GHz and 3.5GHz
 Unlicensed – 5.8GHz

OTHER WIRELESS NETWORK TECHNOLOGIES (3)
OTHER WIRELESS NETWORK TECHNOLOGIES (4)

802.15 (Bluetooth)
 Medium
performance – provide 1Mbps (Ver. 1.2)
and up to 3Mbps (Ver. 2.0 +EDR (Enhanced Data
Rate))
 Short to Medium Range – Class3 radios offer 3 feet
range , class2 radios(most common) provide 30
feet range and class 1 radios (industrial use)
provide 300 feet range
 Low power – class 2 devices operate at 2.5mW
 Low cost – 1-2 $ per chip
OTHER WIRELESS NETWORK TECHNOLOGIES (5)

802.15 (Bluetooth)
 2.4GHz
 FHSS
(Frequency Hopping Spread Sprectrum)
 802.15.1 (Initial)/ 802.15.3 (draft –speed up to 20
Mbps)
 Adhoc networking
OTHER WIRELESS NETWORK TECHNOLOGIES (6)

802.15.4 (ZigBee)
 Short
to Medium Range – 30 to 300 feet range
 Low Power – can operate months to years
 Low Cost – more cost effective than Bluetooth
 Low Performance
 250
kbps at 2.4GHz
 40Kbps at 915MHz
 20Kbps at 868 MHz
OTHER WIRELESS NETWORK TECHNOLOGIES (6)

Certified Wireless USB



USB Implementer Forum (USV-IF) is a nonprofit corporation founded by the group of
companies that developed the USB (Universal
Serial Bus) specification
Wireless USB use WiMedia MB-OFDM
Ultra-wideband (UWB) radio platform
Wireless USB targets 480Mbps at 3
meters /110Mbps at 10meters
WIRELESS WAN TECHNOLOGIES (1)

2.5G
 The first major step in the evolution of GSM
networks to 3G occurred with the introduction of
General Packet Radio Service (GPRS).
 GPRS
could provide data rates from 56 kbit/s up to
115 kbit/s.
 CDMA2000
networks similarly evolved through the
introduction of 1xRTT.
 1xRTT
supports bi-directional (up and downlink) peak data
rates up to 153.6 kbit/s, delivering an average user data
throughput of 80-100 kbit/s in commercial networks.
WIRELESS WAN TECHNOLOGIES (2)
It can be used for services such as Wireless
Application Protocol (WAP) access, Multimedia
Messaging Service (MMS), and for Internet
communication services such as email and
World Wide Web access.
 It can also be used for WAP, SMS & MMS
services, as well as Internet access.

WIRELESS WAN TECHNOLOGIES (2)
3G – UMTS ,CDMA2000
 3.5  4G
 4.5G
