By Matthew S. Gast
This can be a nice e-book for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The publication not just talks approximately theoretical stuff but in addition offers sensible points of wireless networking.
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Extra resources for 802.11 Wireless Networks: The Definitive Guide, Second Edition
11 does not support this type of transition, except to allow the station to associate with an access point in the second ESS once it leaves the first. Higher-layer connections are almost guaranteed to be interrupted. 11 supports ESS transitions only to the extent that it is relatively easy to attempt associating with an access point in the new extended service area. Maintaining higher-level connections requires support from the protocol suites in question. In the case of TCP/ IP, Mobile IP is required to seamlessly support an ESS transition.
The distribution system is responsible for tracking where a station is physically located and delivering frames appropriately. When a frame is sent to a mobile station, the distribution system is charged with the task of delivering it to the access point serving the mobile station. As an example, consider the router in Figure 2-5. The router simply uses the MAC address of a mobile station as its destination. The distribution system of the ESS pictured in Figure 2-5 must deliver the frame to the right access point.
In Figure 2-5, the router uses the station's MAC address as the destination to deliver frames to a mobile station; only the access point with which that mobile station is associated delivers the frame. The router remains ignorant of the location of the mobile station and relies on the access points to deliver the frame. 11 radio chips had the ability to create a single basic service set. An AP could have connect users to only one "wireless network," and all users on that network had similar, if not identical, privileges.