2b_WLAN - Wireless LANs and IEEE 802.11 MAC CSE 6590 Winter...

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CSE 6590 Winter 2012 Wireless LANs and IEEE 802.11 MAC February 14, 2012
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Overview 2
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Applications of Wireless LANs Key application areas: LAN extension cross-building interconnect nomadic access ad hoc networking 3
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Infrastructure Wireless LAN 4
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Ad Hoc Networking temporary peer-to-peer network (no infrastructure) 5
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Wireless LAN Requirements 6
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Wireless LAN Technologies 7
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IEEE 802.11 Standards Standard Scope Medium access control (MAC): One common MAC for WLAN applications Physical layer: Infrared at 1 and 2 Mbps Physical layer: 2.4-GHz FHSS at 1 and 2 Mbps IEEE 802.11 Physical layer: 2.4-GHz DSSS at 1 and 2 Mbps IEEE 802.11a Physical layer: 5-GHz OFDM at rates from 6 to 54 Mbps IEEE 802.11b Physical layer: 2.4-GHz DSSS at 5.5 and 11 Mbps IEEE 802.11c Bridge operation at 802.11 MAC layer IEEE 802.11d Physical layer: Extend operation of 802.11 WLANs to new regulatory domains (countries) IEEE 802.11e MAC: Enhance to improve quality of service and enhance security mechanisms IEEE 802.11f Recommended practices for multivendor access point interoperability IEEE 802.11g Physical layer: Extend 802.11b to data rates >20 Mbps IEEE 802.11h Physical/MAC: Enhance IEEE 802.11a to add indoor and outdoor channel selection and to improve spectrum and transmit power management IEEE 802.11i MAC: Enhance security and authentication mechanisms IEEE 802.11j Physical: Enhance IEEE 802.11a to conform to Japanese requirements IEEE 802.11k Radio resource measurement enhancements to provide interface to higher layers for radio and network measurements IEEE 802.11m Maintenance of IEEE 802.11-1999 standard with technical and editorial corrections IEEE 802.11n Physical/MAC: Enhancements to enable higher throughput IEEE 802.11p Physical/MAC: Wireless access in vehicular environments IEEE 802.11r Physical/MAC: Fast roaming (fast BSS transition) IEEE 802.11s Physical/MAC: ESS mesh networking IEEE 802.11,2 Recommended practice for the Evaluation of 802.11 wireless performance IEEE 802.11u Physical/MAC: Interworking with external networks
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IEEE 802.11 Terminology Access point (AP) Any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations Basic service set (BSS) A set of stations controlled by a single coordination function Coordination function The logical function that determines when a station operating within a BSS is permitted to transmit and may be able to receive PDUs Distribution system (DS) A system used to interconnect a set of BSSs and integrated LANs to create an ESS Extended service set (ESS) A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs MAC protocol data unit (MPDU) The unit of data exchanged between two peer MAC entities using the services of the physical layer MAC service data unit (MSDU) Information that is delivered as a unit between MAC users Station Any device that contains an IEEE 802.11 conformant MAC and physical layer 9
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IEEE 802.11 Architecture 10
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IEEE 802.11 - BSS
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This note was uploaded on 02/14/2012 for the course CSE 6590 taught by Professor Kotakoski during the Winter '12 term at York University.

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2b_WLAN - Wireless LANs and IEEE 802.11 MAC CSE 6590 Winter...

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