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IEEE 802.11
IEEE 802.11
Architecture
Physical Layer
MAC Layer
Addressing Mechanism
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The McGraw-Hill Companies, Inc., 2004
Figure 15.1 BSSs
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Figure 15.2 ESS
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Figure 15.3 Physical layer specifications
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Figure 15.6 MAC layers in IEEE 802.11 standard
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Figure 15.8 CSMA/CA and NAV
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Figure 15.9 Frame format
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Table 15.1 Subfields in FC field
Table 15.1 Subfields in FC field
Field Explanation
Version
Version
The current version is 0.
The current version is 0.
Type
Type
Type of information: management (00), control (01), or data
Type of information: management (00), control (01), or data
(10).
(10).
Subtype
Subtype
Defines the subtype of each type (see ).
Defines the subtype of each type (see ).
To DS
To DS
Defined later.
Defined later.
From DS
From DS
Defined later.
Defined later.
More flag
More flag
When set to 1, means more fragments.
When set to 1, means more fragments.
Retry
Retry
When set to 1, means retransmitted frame.
When set to 1, means retransmitted frame.
Pwr mgt
Pwr mgt
When set to 1, means station is in power management mode.
When set to 1, means station is in power management mode.
More data
More data
When set to 1, means station has more data to send.
When set to 1, means station has more data to send.
WEP
WEP
Wired equivalent privacy. When set to 1, means encryption
Wired equivalent privacy. When set to 1, means encryption
implemented.
implemented.
Rsvd
Rsvd
Reserved.
Reserved.
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Control Frame
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Control frames
. 0.
The current version is 0.
Type
Type
Type of information: management (00), control (01), or data
Type of information: management (00), control (01), or. NAV
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Figure 15.9 Frame format
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Table 15.1 Subfields
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