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Need Wireless Id Number For Wifi Mac Frame Contains
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Need Wireless Id Number For Wifi Driver Version May

Need Wireless Id Number For Wifi Driver Version May

Driver version may differ depending on the wireless adapter installed.

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If STA is member of an IBSS, then the BSSID is BSSID of IBSS system.

This article on WLAN MAC protocol describes WLAN MAC frame format as per IEEE 802.11 wifi MAC.

MAC header: It consists of frame control field, duration, address fields 1-3, sequence control field.

Frame body: This field vary in size and consists of information based on frame type to be carried.

FCS: stands for Frame Check Sequence, this is 32 bit CRC (i.e.

The MAC frame format comprises a set of fields that occur in a fixed order in all frames.

The figure below depicts the generic MAC frame format as defined in IEEE 802.11 MAC specifications.

The fields Address field 2 and 3, sequence control field, address-4, frame body are present in particular frame types only.

Need Wireless Id Number For Wifi Mac Frame Contains

As mentioned earlier, wlan mac frame contains mac header, frame body and FCS fields.

All the above sub-fields of Frame Control field is depicted in the following figure.

In control type frames of subtype Power Save (PS)-Poll, the DurationID field carries the association identity (AID) of the station that transmitted the frame in the 14 least significant bits (LSB), with the 2 most significant bits (MSB) both set to 1.

In all the other frames, this field contains duration value as specified for each of the frame.

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For all the frames transmitted during the CFP (contention free time period) this field is set to 32,768.

If the content of this field is less than 32768, it is used to update NAV (Network Allocation Vector).

There are four address fields in the 802.11 WLAN MAC frame.

These fields describe following sub-fields: BSSID Source address (SA) Destination address (DA) Transmitting station address (TA) Receiving station address (RA) Not all the frames contain these fields; some may or may not be present.

Above address field contents are depicted in the figure below.

A station uses contents of the address-1 field to perform receive address matching.

In the cases where in address-1 field contains group address then BSS-ID is validated.

This ensures that broadcastmulticast is originated from the same BSS.

A STA uses the contents of the address-2 field to route acknowledgment if an ACK is required.

The SA is the address of the MAC entity that initiated the MSDU (or fragment thereof) in the frame body field.

The RA is address of the station contained in access point in WDS that is the next immediate intended recipient of the frame.

The TA is the address of the station contained in the access point in the WDS that is transmitting the frame.

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