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

By Matthew Gast

ISBN-10: 0596001835

ISBN-13: 9780596001834

It is a nice e-book for wireless process engineers to appreciate 802.11 a\b\g PHY and MAC. The e-book not just talks approximately theoretical stuff but in addition supplies useful facets of wireless networking.

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Additional info for 802.11 Wireless Networks: The Definitive Guide (O'Reilly Networking)

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However, there is a longer congestion window when transmissions are retried (see next section). 2. Multiframe sequences may update the NAV with each step in the transmission procedure. When a station receives a medium reservation that is longer than the current NAV, it updates the NAV. Setting the NAV is done on a frame-by-frame basis and is discussed in much more detail in the next chapter. 3. The following types of frames can be transmitted after the SIFS and thus receive maximum priority: acknowledgments, the CTS in an RTS/CTS exchange sequence, and fragments in fragment sequences.

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. Figure 3-21 illustrates this process. In this figure, the station has recently changed from a low-power mode to an active mode, and it notes that the access point has buffered frames for it.

Therefore, the frame type is the third bit in the frame control field followed by the second bit (b3 b2), and the subtype is the seventh bit, followed by the sixth, fifth, and fourth bits (b7 b6 b5 b4). Table 3-1. Type and subtype identifiers Subtype value Subtype name [a] Management frames (type=00) 0000 Association request 0001 Association response 0010 Reassociation request 0011 Reassociation response 0100 Probe request 0101 Probe response 1000 Beacon 1001 Announcement traffic indication message (ATIM) 1010 Disassociation 1011 Authentication 1100 Deauthentication [b] Control frames (type=01) 1010 Power Save (PS)-Poll 1011 RTS 1100 CTS 1101 Acknowledgment (ACK) 1110 Contention-Free (CF)-End 1111 CF-End+CF-Ack [c] Data frames (type=10) 0000 Data 0001 Data+CF-Ack 0010 Data+CF-Poll 0011 Data+CF-Ack+CF-Poll Table 3-1.

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


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