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APPENDIX E: IEEE 802.11 Technical Tutorial
•
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.
Figure E-5. MAC Frame Format.
Frame Control Field
The Frame Control field contains the following information:
Figure E-6. Frame Control Field.
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.
Protocol
Version
B0
2
Bits:
2
4
1
1
1
1
1
1
1
1
B1
Type
To
DS
From
DS
More
Frag
Retry
Pwr
Mgt
More
Data
WEP Order
Subtype
B2
B7 B8
B9
B10
B11 B12 B13 B14 B15
B3B4
Frame
Control
2
Octets:
2
2
6
MAC Header
6
6
6
0 to 2312
4
Duration/
ID
Address 1 Address 2 Address 3
Sequence
Control
Address 4
Frame
Body
CRC
Summary of Contents for LW0050A
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