Lecture7 - Chapter7:WirelessLANs Characteristics...

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7.1 Prof. Dr.-Ing. Jochen H. Schillerwww.jochenschiller.deMC - 2008 Mobile Communications  Chapter 7: Wireless LANs  Characteristics  IEEE 802.11 (PHY, MAC, Roaming)  Bluetooth  Bianchi Model  IEEE 802.15.x (Zigbee)
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Prof. Dr.-Ing. Jochen H. Schillerwww.jochenschiller.deMC - 2008 7.2 Mobile Communication Technology  according to IEEE (examples) Local wireless networks WLAN  802.11 802.11a 802.11b 802.11i/e/…/n/…/z 802.11g WiFi 802.11h Personal wireless nw WPAN  802.15 802.15.4 802.15.1 802.15.2 Bluetooth 802.15.4a/b/c/d/e ZigBee 802.15.3 Wireless distribution networks WMAN  802.16 (Broadband Wireless Access) [802.20 (Mobile Broadband Wireless Access)] 802.16e (addition to .16 for mobile devices) + Mobility WiMAX 802.15.3b/c 802.15.5, .6 (WBAN)
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Prof. Dr.-Ing. Jochen H. Schillerwww.jochenschiller.deMC - 2008 7.3 Characteristics of wireless LANs Advantages very flexible within the reception area  Ad-hoc networks without previous planning possible (almost) no wiring difficulties (e.g. historic buildings, firewalls) more robust against disasters like, e.g., earthquakes, fire - or users  pulling a plug...  Disadvantages typically very low bandwidth compared to wired networks  (1-10 Mbit/s) due to shared medium many proprietary solutions, especially for higher bit-rates, standards  take their time (e.g. IEEE 802.11n) products have to follow many national restrictions if working wireless,  it takes a vary long time to establish global solutions like, e.g., IMT- 2000
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Prof. Dr.-Ing. Jochen H. Schillerwww.jochenschiller.deMC - 2008 7.4 Design goals for wireless LANs global, seamless operation low power for battery use  no special permissions or licenses needed to use the LAN  robust transmission technology simplified spontaneous cooperation at meetings  easy to use for everyone, simple management  protection of investment in wired networks  security (no one should be able to read my data), privacy (no one  should be able to collect user profiles), safety (low radiation) transparency concerning applications and higher layer protocols,  but also location awareness if necessary
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Prof. Dr.-Ing. Jochen H. Schillerwww.jochenschiller.deMC - 2008 7.5 Comparison: infrared vs. radio  transmission Infrared uses IR diodes, diffuse light, multiple  reflections (walls, furniture etc.) Advantages simple, cheap, available in many  mobile devices no licenses needed simple shielding possible Disadvantages interference by sunlight, heat sources  etc.
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  • Spring '09
  • SALMAN
  • Jochen H. Schillerwww.jochenschiller.deMC, Prof. Dr.­Ing. Jochen H., Prof. Dr.­Ing. Jochen, Dr.­Ing. Jochen H.

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