 Midterm 30%  Final 40%  LAB 15%  Assignment 15%  Text Book – Designing and Deploying 802.11n Wireless Networks  Jim Geier (ciscopress)

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Presentation transcript:

 Midterm 30%  Final 40%  LAB 15%  Assignment 15%  Text Book – Designing and Deploying n Wireless Networks  Jim Geier (ciscopress)

W.lilakiatsakun

 Introduction to Wireless Networks  Wireless LAN Markets and Applications  Benefits of Wireless Networks  Wireless Network Technologies  Other Wireless Network Technologies

 Retail – connection between devices (printer /barcode) and computer system

 Warehousing – Wireless Barcode system to support CDC (Central Distributing Center)

 Healthcare

 Video Surveillance

What else have you thought of wireless applications ?

 Mobility  Can move to anywhere  Solve some wire problems  Connector problems  Cable Erosion  Install in Difficult-to-Wire Access  Remote Area  Dangerous area

 Reduced Installation Time  Long-term Cost Saving  Productivity Gain

 Performance  Low Bandwidth  High Error Rate  Security  Broadcast signal  Limited Power Consumption  Operating on battery

 IEEE (WIFI)

 a  OFDM (Orthogonal Frequency Division Multiplexing)  5GHz Band  54 Mbps  b  DSSS (Direct Sequence Spread Spectrum)  2.4GHz Band  11 Mbps

 g  OFDM (Orthogonal Frequency Division Multiplexing)  Backward Compatible with b  2.4GHz Band  54 Mbps for g  11 Mbps for b (RTS/CTS used for protection mechanism when b client try to connect to b/g access point)

 n  MIMO (Multiple Input Multiple Output)  Channel bonding and Frame aggregation  Support 2.4GHz and 5GHz  Backward compatible with g and a

 Wi-Fi Alliance is an international, non-profit organization focusing on the manufacturing, marketing, and interoperability of WLAN products

 Wi-Fi alliance goals  1 Promote WIFI-certification worldwide by encouraging manufacturers to follow standardized processes in the development WLAN products  2 Market Wi-Fi certified product to customers in the home, office and enterprise market

 IEEE (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 Wi- Fi  High to very high cost – Hardwares is more expensive than Wi-Fi

 WiMAX Standard  d – Only fixed wireless  e – Fixed and mobile wireless  m – under development (speed up to 1Gbps)  WiBro – Based on e and has functionality defined by Mobile WiMAX  WiMAX Frequency  Licensed – 2.5GHz and 3.5GHz  Unlicensed – 5.8GHz

 (Bluetooth)  Medium performance – provide 1Mbps (Ver. 1.2) and up to 3Mbps (Ver 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

 (Bluetooth)  2.4GHz  FHSS (Frequency Hopping Spread Sprectrum)  (Initial)/ (draft –speed up to 20 Mbps)  Adhoc networking

 (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

 Certified Wireless USB  USB Implementer Forum (USV-IF) is a non- profit 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

 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  GPRS could provide data rates from 56 kbit/s up to 115 kbit/s.  CDMA2000 networks similarly evolved through the introduction of 1xRTT.1xRTT  1xRTT supports bi-directional (up and downlink) peak data rates up to kbit/s, delivering an average user data throughput of kbit/s in commercial networks. 

 It can be used for services such as Wireless Application Protocol (WAP) access, Multimedia Messaging Service (MMS), and for Internet communication services such as and World Wide Web access.Wireless Application Protocol  It can also be used for WAP, SMS & MMS services, as well as Internet access.

 3G – UMTS,CDMA2000   4G  4.5G