WLAN - Beacon                                             Home : www.sharetechnote.com

 

 

 

 

Following is the list of information broadcast by Beacon signal. Not all of these information are broadcast by an AP. Many of these fields are broadcast only in a specific condition (you can find the further details in 802.11 - 8.3.3.2 Beacon frame format).

 

Order

Information

Description

1

Time Stamp  

2

Beacon Interval  

3

Capability Information  

4

SSID  

5

Supported Rates  

6

FH (Frequency Hopping) Parameter Set  

7

DS (Direct Sequence) Parameter Set  

8

CF (Contention Free) Parameter Set  

9

IBSS Parameter Set  

10

TIM(Traffic Indication Map)  

11

Country  

12

FH Parameters

 

13

FH Pattern Table

 

14

Power Constraint

 

15

Channel Switch Announcement

 

16

Quiet  

17

IBSS DFS

 

18

TPC Report

 

19

ERP  

20

Extended Supported Rates

 

21

RSN  

22

BSS Load

 

23

EDCA Parameter Set

 

24

QoS Capability

 

25

AP Channel Report

 

26

BSS Average Access Delay

 

27

Antenna

 

28

BSS Available Admission Capacity

 

29

BSS AC Access Delay

 

30

Measurement Pilot Transmission

 

31

Multiple BSSID

 

32

RM Enabled Capabilities

 

33

Mobility Domain

 

34

DSE registered location

 

35

Extended Channel Switch Announcement

 

36

Supported Operating Classes

 

37

HT Capabilities

 

38

HT Operation

 

39

20/40 BSS Coexistence

 

40

Overlapping BSS Scan Parameters

 

41

Extended Capabilities

 

42

FMS Descriptor

 

43

QoS Traffic Capability

 

44

Time Advertisement

 

45

Interworking

 

46

Advertisement Protocol

 

47

Roaming Consortium

 

48

Emergency Alert Identifier

 

49

Mesh ID

 

50

Mesh Configuration

 

51

Mesh Awake Window

 

52

Beacon Timing

 

53

MCCAOP Advertisement Overview

 

54

MCCAOP Advertisement

 

55

Mesh Channel Switch Parameters

 

Last

Vendor Specific

 

 

Following is an example of Beacon Frame contents.