EDUCAUSE Southwest Regional Conference 2003 Wireless Convergence: More or Less the Sum of its Parts? Doug Jackson Director, Technology Customer Services UT Dallas Copyright Doug Jackson 2003. This work is the intellectual property of the author. Permission is granted for this material to be shared for non-commercial, educational purposes, provided that this copyright statement appears on the reproduced materials and notice is given that the copying is by permission of the author. To disseminate otherwise or to republish requires written permission from the author.
Wireless Convergence: More or Less the Sum of its Parts?
IEEE Standards for Wireless LAN Spread Spectrum Radio Technology (802.11)
802.11b- 2.4GHz @11mbps
802.11a- 5GHz @54mbps
802.11g- 2.4GHz @54mpbs
802.11e- QoS services
802.11i- 802.1x security
Basic Technology Concepts WiFi b-a-g Access Point - network device that links wireless stations to the wired network- $900-$500/unit Wireless NIC cards - USB or PC card -radio transceivers for the end users -- $795/card $595/card $275/card $150/card $85/card
Basic Technology Concepts WiFi b-a-g 802.11c- work moved to 802.1D 802.11d- Extensions in other Regulatory Domains 802.11e - MAC Enhancements-Security/QoS 802.11f- Inter-Access Point Protocol 802.11h- Spectrum Managed 5Ghz 802.11i- Enhanced Security (TKIP and 802.1x)
Basic Technology Concepts WiFi b-a-g The Rules of Thumb of Radio Higher data rates usually imply shorter transmission range Higher power output increases range, but increases power consumption (less battery life) The higher the frequency, the higher the data rate (but smaller range). Cordless phone Microwave oven Bluetooth Hiperlan devices Cordless phone Microwave oven Bluetooth Interference sources Worldwide US Worldwide availability 54Mbps 54Mbps 11Mbps Max data rate 2.4GHz 5GHz 2.4GHz Frequency band 802.11 g 802.11 a 802.11 b
Basic Technology Concepts WiFi b-a-g ? 5.5Mbps 11Mbps 36Mbps 54Mbps 802.11g estimates 12Mbps 11Mbps 125 ft 1Mbps 350 ft 2Mbps 250 ft 6Mbps 5.5Mbps 150 ft 36Mbps 11Mbps 100 ft 54Mbps 11Mbps 50 ft 802.11a @40Mw 802.11b @100Mw
Impact of these technologies moving toward Convergence…
Dual WiFi/cellular phones using SIP
6 party conference call with 1-button drop/add/transfer functions
Single mailbox for user, regardless of service type (WLAN, Cellular, etc)
Service charges that take into account roaming between free and cost wireless environments
Wrapup Thank You! This presentation can be found at the following URL: http://www.utdallas.edu/ir/wlans
Wrapup URLs Pittsburgh Public Hotspots: http://www. telerama .com/ Bluetooth SIG: http://www. bluetooth .com/ DSSS and Bluetooth coexistence: http://www. wi - fi .org/downloads/Coexistence_Paper_ Intersil _Aug18.pdf
Wrapup Terms CDMA- “Code Division Multiple Access” Spread spectrum technology for managing multiple access by assigning digital codes and broadcasting the signal across a broader spectrum. TDMA- “Time Division Multiple Access” Technology for managing multiple access by dividing channels (available radio spectrum) into time slots with access in a round-robin fashion. CDMA advantages over TDMA- call clarity, network capacity, more service provisioning, improved privacy, fewer dropped calls, fewer upgrades at the tower.
Wrapup Terms GSM- “Global System for Mobile telecommunications” Designed as international digital cellular service based upon TDMA. European version operates in 900 and 1800 MHz band and is not compatible with North American 1900 MHz version. Multi-band GSM phones can overcome this problem. GPRS- “General Packet Radio Service” GPRS for GSM provides higher-speed data services for mobile users. It is a packet-switching technology better suited to the “bursty” nature of data communications.
Wrapup Terms EDGE - “Enhanced Data for Global Evolution” EDGE for GSM offers 300Kbps (or better) and both circuit-switched and packet-switched data communications. Use an adaptive modulation scheme and is designed for GSM operators that do not have third-generation licenses but wish to remain competitive with wideband services. “ True” 3G Technologies: Wideband cdmaOne, W-CDMA, and W-CDMA/NA are three competing wideband CDMA technologies for “true” 3G services. A TDMA solution for 3G is also being considered.