Chpt 7 Wireless Technologies

Chpt 7 Wireless Technologies - Wireless, Mobile Computing...

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1 Wireless, Mobile Computing and Mobile Commerce Chapter 7
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2 Wireless Technologies Wireless devices – small, easy to carry or wear, have sufficient computing power to perform productive tasks and can communicate wirelessly with the Internet and other devices. includes PDAs, cellular phones, smart phones. “WAP-compliant” (Wireless Application Protocol) industry standard for small wireless devices with small displays, minimal memory and low bandwidth principal application is to enable access to the Internet from a mobile phone or PDA. popular browser for mobile devices is Opera . Overview Video
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3 Wireless Transmission Media Microwave transmission systems are widely used for high- volume, long-distance, point-to-point communication. Point-to-point requires line-of-sight transmission Satellite transmission systems make use of communication satellites; three types of satellites, each in a different orbit: Geostationary (GEO) orbits 22,300 miles directly above the equator and maintains a fixed position; Used for TV signals and satellite radio also allows users to access the Internet (Internet Over Satellite) Can have a propagation delay or be disrupted by environmental conditions. Medium-earth-orbit (MEO) located 6,000 miles above the earth’s surface; used for GPS - a wireless system that uses 24 satellites to determine a position anywhere on the earth Low-earth-orbit (LEO) 400 to 700 miles above the surface and move much quicker so they require many to have adequate coverage; use for telephone.
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4 Wireless Computer Networks IEEE standards for wireless computer networks: Wireless PANs IEEE 802.15 (Bluetooth); IEEE 802.15.4 (Zigbee). Wireless LANs (WLANs IEEE 802.11 (Wi-Fi) Wireless MANs (WMANs) IEEE 802.16 (Wi-Max) Wireless WANS IEEE 802.20 (proposed)
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5 Bluetooth is used to create small PANs: can link up to 8 devices within a 10-meter area; uses low-power, radio-based communications; can transmit up to 1 Mbps ProximityMedia video Wireless Computer Networks and Internet Access
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6 Zigbee targets applications that need low data transmission rates and low power consumption: moves data only one-fourth as fast as Bluetooth; Can handle hundreds of devices at once; most promising application is meter reading. Current focus is to wirelessly link sensors that are embedded into industrial controls, medical devices, smoke and intruder alarms and building and home automation systems Wireless Computer Networks and Internet Access
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7 Wireless Local Area Networks WLAN or WiFi WLAN requires a transmitter with an antenna, called a wireless access point , that connects to a wired LAN. Wireless network interface card (NIC)
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This note was uploaded on 05/04/2008 for the course IDS 180 taught by Professor Clague during the Spring '08 term at San Diego State.

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Chpt 7 Wireless Technologies - Wireless, Mobile Computing...

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