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

By Matthew Gast

This can be a nice e-book for wireless method engineers to appreciate 802.11 a\b\g PHY and MAC. The ebook not just talks approximately theoretical stuff but additionally supplies sensible facets of wireless networking.

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

Example text

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. 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.

11 standard. This book uses the more common term unicast. Unicast frames must be acknowledged to ensure reliability, which means that a variety of mechanisms can be used to improve efficiency. All the sequences in this section apply to any unicast frame and thus can apply to management frames and data frames. In practice, these operations are usually observed only with data frames. 1 Basic positive acknowledgment (final fragment) Reliable transmission between two stations is based on simple positive acknowledgments.

Addresses are 48 bits long. If the first bit sent to the physical medium is a 0, the address represents a single station (unicast). When the first bit is a 1, the address represents a group of physical stations and is called a multicast address. If all bits are 1s, then the frame is a broadcast and is delivered to all stations connected to the wireless medium. 48-bit addresses are used for a variety of purposes: Destination address As in Ethernet, the destination address is the 48-bit IEEE MAC identifier that corresponds to the final recipient: the station that will hand the frame to higher protocol layers for processing.

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