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• PLCP Signaling Field, which currently contains only the rate information,
encoded in 0.5-Mbps increments from 1 Mbps to 4.5 Mbps.
• Header Error Check Field, which is a 16-bit CRC error-detection field.
E.10.3 MAC D
ATA
The following figure shows the general MAC Frame Format. Part of the fields are
only present in part of the frames as described later.
Octets:
2
2
Frame
Duration/
Control
ID
Frame Control Field
The Frame Control field contains the following information:
B0
B1
B2
Protocol
Type
Version
Bits:
2
2
Protocol Version
This field consists of 2 bits which are unvarying in size and placement across
following versions of the 802.11 Standard, and will be used to recognize possible
future versions. In the current version of the standard, the value is fixed as 0.
6
6
Address 1 Address 2 Address 3
MAC Header
Figure E-5. MAC Frame Format.
B3B4
Subtype
4
Figure E-6. Frame Control Field.
APPENDIX E: IEEE 802.11 Technical Tutorial
6
2
Sequence
Control
B7 B8
B9
To
From
DS
DS
1
1
6
0 to 2312
Frame
Address 4
Body
B10 B11 B12 B13 B14 B15
More
Pwr
More
Retry
Frag
Mgt
Data
1
1
1
1
4
CRC
WEP Order
1
1
137
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