- WIRELESS MAC ADDRESS VISTA UPDATE
- WIRELESS MAC ADDRESS VISTA 32 BIT
- WIRELESS MAC ADDRESS VISTA FREE
The SA is the address of the MAC entity that initiated the MSDU (or fragment thereof) in the frame body field. The DA is the destination of the MSDU (or fragment thereof) in the frame body field. This ensures that broadcast/multicast is originated from the same BSS.Ī STA uses the contents of the address-2 field to route acknowledgment if an ACK is required. In the cases where in address-1 field contains group address then BSS-ID is validated.
Not all the frames contain these fields some may or may not be present.Ībove address field contents are depicted in the figure below.Ī station uses contents of the address-1 field to perform receive address matching. These fields describe following sub-fields: There are four address fields in the 802.11 WLAN MAC frame.
WIRELESS MAC ADDRESS VISTA UPDATE
If the content of this field is less than 32768, it is used to update NAV (Network Allocation Vector).
WIRELESS MAC ADDRESS VISTA FREE
In all the other frames, this field contains duration value as specified for each of the frame.įor all the frames transmitted during the CFP (contention free time period) this field is set to 32,768. In control type frames of subtype Power Save (PS)-Poll, the Duration/ID 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.ĪID value varies between values from 1 to 2007. This Frame control field composed of following sub-fields :Īll the above sub-fields of Frame Control field is depicted in the following figure. Let us understand these mac header fields below. Each of these fields are defined below.Īs mentioned earlier, wlan mac frame contains mac header, frame body and FCS fields.Ĩ02.11 mac header consists of frame control field, duration/ID field, address fields and sequence control field. The fields Address field 2 and 3, sequence control field, address-4, frame body are present in particular frame types only. The figure below depicts the generic MAC frame format as defined in IEEE 802.11 MAC specifications. The MAC frame format comprises a set of fields that occur in a fixed order in all frames. WIRELESS MAC ADDRESS VISTA 32 BIT
FCS: stands for Frame Check Sequence, this is 32 bit CRC (i.e. Frame body: This field vary in size and consists of information based on frame type to be carried. MAC header: It consists of frame control field, duration, address fields 1-3, sequence control field. All stations should be able to properlyĬonstruct frames for transmission and decode frames upon reception, as specified here.Ĩ02.11 MAC frame is composed of header, body and FCS part. The format of the MAC frames is specified here. The MAC header containsįrame control field, duration field, address fields and sequence control field. The WLAN MAC frame consists of MAC header, body and FCS. This article on WLAN MAC protocol describes WLAN MAC frame format as per IEEE 802.11 wifi MAC WLAN MAC protocol | WLAN MAC frame format | 802.11 wifi MAC
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