ECE_6610_Chapter_3.pdf - CHAPTER 3 WIRELESS LOCAL AREA NETWORKS I F Akyildiz Ken Byer Chair Professor in Telecommunications Broadband Wireless

ECE_6610_Chapter_3.pdf - CHAPTER 3 WIRELESS LOCAL AREA...

This preview shows page 1 - 11 out of 161 pages.

CHAPTER 3:WIRELESS LOCAL AREA NETWORKSI. F. AkyildizKen Byer Chair Professor in TelecommunicationsBroadband Wireless Networking LaboratorySchool of Electrical and Computer EngineeringGeorgia Institute of TechnologyTel: 404-894-5141; Fax: 404-894-7883 Email: [email protected]
IFA’2020ECE66102WLANs are HOT !!!WiFi(Wireless Fidelity) Compatibility between wireless equipment from different vendorsIEEE 802.11 StandardConnect computers to each other and to the InternetTHE access points to connect to the Internet
IFA’2020ECE66103WLANs: Current UsesHomes, Airports, Convention Centers, Cafes, Train Stations, Airplanes, Malls, everywhere Hospitals Warehouses UniversitiesMeeting roomsRetail storesRestaurants Car rental agencies SIMPLY EVERYWHERE !!
IFA’2020ECE6610WiFi Network TopologiesAP Based Topology (Infrastructure Mode)Peer to Peer Topology (Ad Hoc Mode)4
IFA’2020ECE66105WIRELESS LANs ArchitectureInfrastructureNetworkAd Hoc NetworkAPAPAPAP: Access PointWired NW
IFA’2020ECE66106Detailed Reference Architecture of WirelessLANsStation (STA)Basic Service Set (BSS) (CELL)Group of STAs using the same radio frequencyAccess Point (Bridge)PortalBridge to other (wired) networksExtended Service Set (ESS) consists of two or more BSSs interconnected by a distribution system Distribution System a wired backbone LAN Wired NWDistribution System (Wired)PortalAccessPointBSS2BSS1AccessPointSTA1STA2STA3ESS
IFA’2020ECE66107MOBILITY TYPESNo Transition:Either stationary or moves only within one BSSBSS Transition:Moves from BSS BSS within the same ESS ESS Transition: Moves from BSS/ESS to another BSS/ ESS
IFA’2020ECE6610DETAILED LIST OF IEEE 802.11 STANDARDSIEEE 802.11: 1Mbit/s and 2Mbps; 2.4GHz RF and IR standard (1997) IEEE 802.11a: 54Mbps; 5GHz standard (1999)IEEE 802.11b: Enhancements to 802.11 to support 5.5Mbpsand 11Mbps(1999)IEEE 802.11c: Bridge operation procedures (2001)IEEE 802.11d: International (country-to-country) roaming extensions (2001)IEEE 802.11e: Enhancements: QoS (2005IEEE 802.11g: 54Mbps; 2.4GHz standard (backwards compatible with 802.11 b) (2003)IEEE 802.11h: Dynamic Spectrum Managed 802.11a (5GHz) for EU (2004)IEEE 802.11i: MAC Enhancements for Enhanced Se (2004)IEEE 802.11j: 4.9-5GHz Extensions for Japan (2004) IEEE 802.11k: Radio resource measurement interface to higher layers (2008) IEEE 802.11n: Higher-throughput(100+Mbps) improvements using MIMO (2009) IEEE 802.11p: Inter-Vehicle and Vehicle Road Side Com at 5.8GHz (2010)8
IFA’2020ECE6610DETAILED LIST OF IEEE 802.11 STANDARDSIEEE 802.11r: Fast BSS transition (Romaing) (2008) IEEE 802.11s: Mesh Networking; (ESS) (2011) IEEE 802.11u: Inter-working with External Networks HotSpotsand cellular network offload (2011) IEEE 802.11v: Wireless Network Management (2011) IEEE802.11w: Protected Management Frames (2009)IEEE 802.11y: 36503700MHz Operation in the U.S. (2008) IEEE 802.11z: Extensions to Direct Link Setup (DLS) for Power Save (2010)IEEE 802.11aa: Audio Video Transport Streams (2012)IEEE802.11ac: Very High Throughput < 6GHz; 802.11n extensions (2013)multi user MIMO IEEE 802.11ad: Very High Throughput 60GHz (2012)IEEE 802.11af: TV Whitespace (2014)9
IFA’2020ECE6610IEEE802.11ah: Sub 1GHz for IoT(e.g., sensor network, smart metering)

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture