802.11 - cps750 wireless networking 6-1 Chapter 6: Wireless...

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Unformatted text preview: cps750 wireless networking 6-1 Chapter 6: Wireless and Mobile Networks and materials from book by W. Stallings Background: ❒ # wireless (mobile) phone subscribers now exceeds # wired phone subscribers! ❒ computer nets: laptops, palmtops, PDAs, Internet-enabled phone promise anytime untethered Internet access ❒ two important (but different) challenges ❍ communication over wireless link ❍ handling mobile user who changes point of attachment to network cps750 wireless networking 6-2 Characteristics of selected wireless link standards Indoor 10-30m Outdoor 50-200m Mid-range outdoor 200m – 4 Km Long-range outdoor 5Km – 20 Km .056 .384 1 4 5-11 54 IS-95, CDMA, GSM 2G UMTS/WCDMA, CDMA2000 3G 802.15 802.11b 802.11a,g UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 3G cellular enhanced 802.16 (WiMAX) 802.11a,g point-to-point 200 802.11n Data rate (Mbps) data cps750 wireless networking 6-3 Wireless network taxonomy single hop multiple hops infrastructure (e.g., APs ) no infrastructure host connects to base station (WiFi, WiMAX, cellular) which connects to larger Internet no base station, no connection to larger Internet (Bluetooth, ad hoc nets) host may have to relay through several wireless nodes to connect to larger Internet: mesh net no base station, no connection to larger Internet. May have to relay to reach other a given wireless node MANET, VANET cps750 wireless networking 6-4 IEEE 802.11 Wireless LAN ❒ 802.11b ❍ 2.4-5 GHz unlicensed radio spectrum ❍ up to 11 Mbps ❍ direct sequence spread spectrum (DSSS) in physical layer • all hosts use same chipping code ❍ widely deployed, using base stations ❒ 802.11n multiple antennae ❍ 2.4-5 GHz range ❍ up to 200 Mbps ❒ 802.11a ❍ 5-6 GHz range ❍ up to 54 Mbps ❒ 802.11g ❍ 2.4-5 GHz range ❍ up to 54 Mbps ❒ 802.11e ❍ QoS upgrade of 802.11 ❒ 802.11p ❍ Vehicular communications ❒ All use CSMA/CA for multiple access ❒ All have base-station and ad-hoc network versions cps750 wireless networking 6-5 Making the Data Network Go Mobile Cellular Systems GSM, TDMA, CDMA GPRS, EDGE W-CDMA, 3G Personal Area Local Area Wide Area PAN Bluetooth ❒ Wireless LAN IEEE.802.11, HiperLAN/2 cps750 wireless networking 6-6 Complementing wireless datacom solutions Mbps 1 10 100 0,1 Outdoor Fixed Walk Vehicle Indoor Fixed/ Desktop Walk Mobility Wideband Cellular W-LAN User Bitrate, Datacom services Bluetooth G S M , I S- 9 5 , D- A M P S LAN Wide Area Network (WAN)- Coverage Local Area Network (LAN)- Hot Spots - high speed Personal Area Network (PAN)- Connectivity, cable replacement cps750 wireless networking 6-7 Crowd in ISM cps750 wireless networking 6-8 802.11 LAN architecture ❒ wireless host communicates with base station ❍ base station = access point (AP)...
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This note was uploaded on 01/20/2012 for the course CPS 125 taught by Professor Panzer during the Spring '11 term at Ryerson.

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802.11 - cps750 wireless networking 6-1 Chapter 6: Wireless...

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