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Frame formats – Siemens IEEE802.11 User Manual

Page 39

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WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt

Page 39

© Siemens, 2002

Frame
Control

Duration

ID

Addr 1

Addr 2

Addr 3

Addr 4

6HTXHQFH

&RQWURO

CRC

Frame
Body

2

2

6

6

6

6

2

0-2312

4

802.11 MAC Header

Bytes:

Protocol

Version

Type

SubType

To

DS

Retry

Pwr

Mgt

More

Data

WEP

Rsvd

Bits: 2

2

4

1

1

1

1

1

1

1

1

DS

From

More

Frag

Frame Formats

n

MAC Header format differs per Type:
– Control Frames (several fields are omitted)
– Management Frames
– Data Frames

n

Includes Sequence Control Field for filtering of duplicate caused by
ACK mechanism.