Wireless Networks Oleg Aulov - Distributed Operating Systems
Wireless Networks • Wireless LAN • Wireless MAN • Wireless PAN
Wireless LAN • Wi-Fi - 802.11 a/b/g/n • DSRC - 802.11p (Vehicular DOT network - dedicated short range communications) • Fixed Wireless Data
Fixed Wireless Data • Fixed Wireless Data is a class of technologies used to connect two fixed locations (e.g., buildings) with a radio or other wireless link, such as laser bridge. Usually Fixed Wireless Data is part of a Wireless LAN infrastructure. The purpose of a Fixed Wireless Data link is to enable data communications between the two sites or buildings. Fixed Wireless Data links are often a cost-effective alternative to leasing fiber or installing cables between the buildings.
DSRC • Dedicated Short Range Communications is a short to medium range wireless protocol specifically designed for automotive use. It offers communication between the vehicle and roadside equipment. It is a sub-set of the RFID-technology. • 5.9 GHz band (U.S.) • Emergency warning system for vehicles • Cooperative Adaptive Cruise Control • Cooperative Forward Collision Warning • Approaching emergency vehicle warning (Blue Waves)
Wireless MAN • WiMAX (IEEE 802.16) - Worldwide Interoperability for Microwave Access • HIPERMAN (European ETSI alternative) • iBurst 802.20 (Mobile Broadband Wireless Access) • EV-DO • HSDPA+HSUPA (UMTS) • Mobitex (Blackberry) • Canopy (Motorola)
WiMAX • standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL • AP communication goes on a random interrupt basis and we face a problem of QoS with applicaions such as VOIP • Miscnception: WiMAX will deliver 70 Mbit/s over 50 kilometers
iBurst • The HC-SDMA interface operates on a similar premise as GSM or CDMA2000 for cellular phones, with hand-offs between HC-SDMA cells reportedly providing the user with a seamless wideband wireless experience even when moving at the speed of a car or train. • Use adaptive array antennas to improve bandwidth utilizaion
Mobitex (Blackberry) • OSI based packet switched data network developed in early 80s used by military, police, ambulance and firefighters. • Emphasizes on reliability • Two way pagers • packet-switched, narrowband, data-only technology mainly for short burst data
Canopy • Motorola technology • Internet providers • 2 to 40+ miles PtMP, up to 124 miles PtP • Line of Sight
EVDO and HSDPA • EVDO up to 3.1 Mbit/s • Sprint / Vrizon • HSDPA speeds of 1.8, 3.6, 7.2 and 14.4 Mbit/s
Wireless PAN (802.15) • Bluetooth • ZigBee • IrDA • Wireless USB • Wireless HD • Wireless BAN
ZigBee • IEEE 802.15.4 • Smaller and cheaper then Bluetooth • Low data rate, long battery life, secure networking, longer range • Headphones, sensors, industrial control
WuzzBee - Wireless USB • 480 Mbit/s at distances up to 3 meters and 110 Mbit/s at up to 10 meters • game controllers, printers, scanners, digital cameras, MP3 players, hard disks, flash drives, parallel video streams
Wireless HD • standard for consumer electronics, will allow for uncompressed, digital transmission of HD video and audio signals • theoretical data rates as high as 20 Gbit/s permitting to scale to higher resolutions, color depth, and range • point-to-point, non line-of-sight (NLOS) at up to 10 meters.
Sources Sited • www.wikipedia.org • www.zigbee.org • www.mobitex.com • path.berkeley.edu/~dsrc/ • www.wimaxforum.org • http://www.motorolaptp.com/ • http://motorola.canopywireless.com/support/library/ • http://www.redwoodwireless.com/ • www.usb.org/developers/wusb/ • www.wirelesshd.org/