December 2001
Intermediate to advanced
336 pages
8h 42m
English
Content preview from OFDM Wireless LANs: A Theoretical and Practical Guide
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MAC Frame Structure
The basic MAC frame structure for a single sector system is shown in Figure 7.12 a. Each MAC frame consists of the transport channels BCH, FCH, ACH and at least one RCH. If user data is to be transmitted, a DL phase and/or an UL phase are provided. If direct mode is used and data has to be transmitted, it contains also a DiL phase between the DL and UL phase. The duration of the BCH is fixed. The duration of the FCH, DL phase, DiL phase, UL phase and the number of RCHs are dynamically adapted by the AP/CC depending on the current traffic situation.
Figure 7.12. Basic MAC frame structure for (a) a single sector system, (b) multiple sectors (n=number of sectors used by the AP).
The order of the subcomponents is BCH - FCH - ACH ...
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