By Matthew Gast
It is a nice publication for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The ebook not just talks approximately theoretical stuff but additionally provides sensible facets of wireless networking.
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Additional resources for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)
Association Delivery of frames to mobile stations is made possible because mobile stations register, or associate, with access points. The distribution system can then use the registration information to determine which access point to use for any mobile station. Unassociated stations are not "on the network," much like workstations with unplugged Ethernet cables. 11 specifies the function that must be provided by the distribution system using the association data, but it does not mandate any particular implementation.
Figure 3-21. Deferred PS-Poll response example After receiving a data frame, the station must remain awake until the next Beacon is transmitted. Beacon frames only note whether frames are buffered for a station and have no way of indicating the number of frames.
Much of the rest of the world uses 50-Hz current, and interference takes place for 10 ms out of the 20-ms cycle. Wireless LAN stations may attempt to fragment transmissions so that interference affects only small fragments, not large frames. By immediately reducing the amount of data that can be corrupted by interference, fragmentation may result in a higher effective throughput. Fragmentation takes place when a higher-level packet's length exceeds the fragmentation threshold configured by the network administrator.
802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) by Matthew Gast