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Course: COSC 6397, Fall 2008School: U. Houston
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6397 COSC Wireless Networking and Mobile Computing Dr. Rong Zheng rzheng@cs.uh.edu 1 Mobile computing Wireless networking Mobile computing computing on the move, can be wired Wireless networking facilitates mobile computing with flexibility of movement 2 Mobile Computing Models Nomadic With (wired) network connectivity at access points May be disconnected when move Infrastructual Cellular networks Wireless...
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6397 COSC Wireless Networking and Mobile Computing
Dr. Rong Zheng rzheng@cs.uh.edu
1
Mobile computing Wireless networking
Mobile computing computing on the move, can be wired Wireless networking facilitates mobile computing with flexibility of movement
2
Mobile Computing Models
Nomadic
With (wired) network connectivity at access points May be disconnected when move
Infrastructual
Cellular networks Wireless LAN connected to the Internet
Infrastructureless
Peer-to-peer network Mobile ad hoc networks
3
Advantages of using wireless?
Free of wiring
Low cost Ad hoc deployment possible
Mobility
Computing, communication anywhere
4
Limitations/Challenges in using wireless
(Relatively) low data rate Availability/variation of channel quality/interference Security Burn up your brain???
5
Name a Few Wireless Communication Systems
Public radio, satellite, GPS, Cellular phone, gate opener, pager, wireless LAN, bluetooth earphone, cordless phone, walkie talkie, wireless sensors. Remote control
6
History of Wireless Communication Systems
1942 Hedy Lamarr invented frequencyHopping Marconis 1901 transatlantic wireless telegraph 60, 70 Cellular Concept from Bell Labs 1983 AMPS introduced 1997 IEEE 802.11 standardized
1993, 1994 IS-95 CDMA GSM 1994 Bluetooth
Moores law: the number of transistors on a microprocessor would double approximately every 18 months.
7
Evolution of Cellular Systems
1G
Analog Cellular
8
Evolution of Wireless Networks
Freq. WLAN 802.11a 802.11b 802.11g WPAN 802.15.1 (Bluetooth) 802.15.4 (Zigbee) WMAN 802.16 5GHz 2.4GHz 2.4GHz 2.4GHz 2.4GHz 2-11GHz
# of Channel 12 3 3 ~79 16 N/A
Raw Data Modulation Rate 54Mbps 11Mbps 54Mbps 1Mbps 250Kbps 75Mbps OFDM DSSS OFDM FH-SS DSSS OFDM
Ran...
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