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