05. Wireless LAN

05. Wireless LAN - 1 Wireless LAN Communication Networks...

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Unformatted text preview: 1 Wireless LAN Communication Networks Kang Xi, Polytechnic Institute of NYU 2 Overview of Wireless LAN Main Advantage: Freedom Main Challenges: Shared transmission medium Transmission impairments Communication Networks Kang Xi, Polytechnic Institute of NYU 3 Infrared, Optics, Radio Infrared Huge spectrum, potential high data rate Line-of-sight Free space optics At the speed of light Line-of-sight Radio (narrow/wide band) Real freedom High speed Limited frequency resource Communication Networks Kang Xi, Polytechnic Institute of NYU 4 Wireless LAN -- IEEE 802.11 Replacement for Ethernet: wireless channel Frequency band: unlicensed radio spectrum of 2.4GHz and 5GHz Data rates: 1, 2, 5.5, 11, 54 Mbps Range: transmission power up to 100mW indoor: 20 - 25 meters outdoor: 50 - 100 meters Communication Networks Kang Xi, Polytechnic Institute of NYU 5 IEEE 802.11 Protocols IEEE 802.11b: 5, 11Mbps IEEE 802.11a: 6, 9, 12, 18, 24, 36, 48, 54Mbps IEEE 802.11g: 54Mbps IEEE 802.11i: security IEEE 802.11f: Inter Access Point Protocol IEEE 802.11e: Quality of Service enhancement Communication Networks Kang Xi, Polytechnic Institute of NYU 6 Basic Service Set (BSS) Architecture Infrastructure Mode No direct communication is allowed between stations An access point (AP) communicate with all the stations and relay messages Ad Hoc Mode Peer-to-peer direct communication Communication Networks Kang Xi, Polytechnic Institute of NYU 7 Extended Service Set ESS: a set of BSSs interconnected by a distribution System ESS and all of its stations appear to be in a single MAC layer AP communicate with each other to forward traffic Station mobility within an ESS is invisible to the higher layers Communication Networks Kang Xi, Polytechnic Institute of NYU 8 Example Access Point + Router Communication Networks Kang Xi, Polytechnic Institute of NYU 9 Protocol Stacks 802.3 PHY 802.3 MAC LLC IP 802.11 PHY 802.11 MAC Communication Networks...
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05. Wireless LAN - 1 Wireless LAN Communication Networks...

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