wlan - 1 Wireless LAN EL536: Principles of Communication...

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Unformatted text preview: 1 Wireless LAN EL536: Principles of Communication Networks Kang Xi, Polytechnic University 2 Overview of Wireless LAN Main Advantage: Freedom Main Challenges: Shared transmission medium Transmission impairments EL536: Principles of Communication Networks Kang Xi, Polytechnic University 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 EL536: Principles of Communication Networks Kang Xi, Polytechnic University 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 EL536: Principles of Communication Networks Kang Xi, Polytechnic University 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 EL536: Principles of Communication Networks Kang Xi, Polytechnic University 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 EL536: Principles of Communication Networks Kang Xi, Polytechnic University 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 EL536: Principles of Communication Networks Kang Xi, Polytechnic University 8 Example Access Point + Router EL536: Principles of Communication Networks Kang Xi, Polytechnic University 9 Protocol Stacks 802.3 PHY 802.3 MAC LLC IP 802.11 PHY 802.11 MAC EL536: Principles of Communication Networks...
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This note was uploaded on 10/10/2011 for the course ECE 536 taught by Professor Sun during the Spring '11 term at NYU Poly.

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wlan - 1 Wireless LAN EL536: Principles of Communication...

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