Components of A Beacon Frame
Beacon frame consist of MAC header, Frame body and FCS. Some of the fields are listed below.
- Timestamp
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- After receiving the beacon frame all the stations change their local clocks to this time. This helps with synchronization.
- Beacon interval
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- This is the time interval between beacon transmissions. The time at which a node (AP or station when in Ad-hoc) must send a beacon is known as Target Beacon Transmission Time (TBTT). Beacon interval expressed in Time Unit (TU). It is a configurable parameter in the AP and typically configured as 100 TU.
- Capability information
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- Capability information field spans to 16 bits and contain information about capability of the device/network. Type of network such as AdHoc or Infrastructure network is signaled in this field. Apart from this information, it announce the support for polling, encryption details also.
- SSID
- Supported rates
- Frequency-hopping (FH) Parameter Set
- Direct-Sequence (DS) Parameter Set
- Contention-Free (CF) Parameter Set
- IBSS Parameter Set
- Traffic indication map (TIM)
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