M hafez 1990 2007 basic service set single cell

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© Copyright Roshdy H. M. Hafez 1990-2007 Basic Service Set Single cell Typically with Access Point (AP) BSS = terminals + AP + A set of signaling rules Other Networks SYSC-5403 WLAN 12 © Copyright Roshdy H. M. Hafez 1990-2007 Extended Service Set AP AP Distribution System Multiple AP’s form what is known as ESS AP ‘s periodically transmit beacons Wireless terminals scan and discover Authentication and association Adjacent AP ‘s use different radio channels
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7 SYSC-5403 WLAN 13 © Copyright Roshdy H. M. Hafez 1990-2007 SSID & BSSID SSID = Service Set Identifier ¾ Each Network has a unique SSID ¾ A network could be ESS or IBSS ¾ The SSID is 32 Octets BSSID = Basic Service Set Identifier ¾ A cell identifier ¾ 6 Octets ¾ Looks like a MAC address SYSC-5403 WLAN 14 © Copyright Roshdy H. M. Hafez 1990-2007 WiFi Protocol Stack Application Presentation Session Transport Network Link Physical Physical [several] Media Access Control MAC Logical Link Control LLC OSI Stack 802 .11 The LLC layer is common to all 802 standards 802.11 specifies only the MAC and PHYSICAL layers 802 .2
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