New PDF release: 802.11 Wireless Networks: The Definitive Guide (O'Reilly

By Matthew Gast

ISBN-10: 0596001835

ISBN-13: 9780596001834

It is a nice e-book for wireless procedure engineers to appreciate 802.11 a\b\g PHY and MAC. The e-book not just talks approximately theoretical stuff but additionally supplies sensible elements of wireless networking.

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Extra resources for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)

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Once a frame has been accepted by an access point, it uses the distribution service to deliver the frame to its destination. Any communication that uses an access point travels through the distribution service, including communications between two mobile stations associated with the same access point. 11 network. 11, except in terms of the services it must offer. Association Delivery of frames to mobile stations is made possible because mobile stations register, or associate, with access points.

Figure 3-20. 2 Deferred response Instead of an immediate response, access points can also respond with a simple acknowledgment. This is called a deferred response because the access point acknowledges the request for the buffered frame but does not act on it immediately. A station requesting a frame with a PS-Poll must stay awake until it is delivered. Under contention-based service, however, the access point can deliver a frame at any point. A station cannot return to a low-power mode until it receives a Beacon frame in which its bit in the traffic indication map (TIM) is clear.

Fragmentation is controlled by the fragmentation threshold parameter in the MAC. Most network card drivers allow you to configure this parameter. Any frames larger than the fragmentation threshold are fragmented in an implementation-dependent way. Network administrators can change the fragmentation threshold to tune network behavior. Higher fragmentation thresholds mean that frames are delivered with less overhead, but the cost to a lost or damaged frame is much higher because more data must be discarded and retransmitted.

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802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking) by Matthew Gast


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