Changes between Version 7 and Version 8 of 802.11/MAC/Upper/AP


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Timestamp:
Nov 22, 2013, 10:56:37 AM (10 years ago)
Author:
chunter
Comment:

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  • 802.11/MAC/Upper/AP

    v7 v8  
    2222||  '''MPDU Reception States'''  ||
    2323
    24 When receiving a wireless MPDU, an 802.11 AP must filter on the type of packet and where it came from (i.e. transmitter address TA). In the event that the received MPDU is a data frame intended to be delivered to the wired Ethernet portal, it is passed off to the MAC High Framework's [wiki:../MACHighFramework/EthEncap Ethernet de-encapsulation] function before being transmitted via the Ethernet MAC and PHY. When a received frame is one of the many [http://en.wikipedia.org/wiki/IEEE_802.11#Management_Frames management frametypes], the AP honors the 802.11 standard's protocol for handshakes during the association process. This handshake is visualized in the above state diagram.
     24When receiving a wireless MPDU, an 802.11 AP must filter on the type of packet and where it came from (i.e. transmitter address TA). In the event that the received MPDU is a data frame intended to be delivered to the wired Ethernet portal, it is passed off to the MAC High Framework's [wiki:../MACHighFramework/EthEncap Ethernet de-encapsulation] function before being transmitted via the Ethernet MAC and PHY. When a received MPDU is one of the many [http://en.wikipedia.org/wiki/IEEE_802.11#Management_Frames management frametypes], the AP honors the 802.11 standard's protocol for handshakes during the association process. This handshake is visualized in the above state diagram.
    2525
    2626== Ethernet Frame Receptions ==
    … …  
    2828||  '''Ethernet Reception States'''  ||
    2929
     30Ethernet frame receptions come from the Ethernet portal and are delivered to some subset of the wireless stations associated with the AP. If the received Ethernet frame is destined for a broadcast hardware address, the AP sends the frame with a broadcast receiver address (RA) such that all associated nodes can decode it. When the Ethernet frame is destined for a unicast address, the AP only forwards the packet if that address has been associated with the AP. If not, it will throw the packet away.
     31
    3032== Scheduled Event ==
    3133||  [[Image(wiki:802.11/files:AP_sched.png, width=600)]]  ||
    3234||  '''Scheduled Events'''  ||
     35
     36In addition to processing wired and wireless receptions, the AP must also deal with scheduled events. For example, at boot, the AP sets up a schedule to periodically transmit a beacon frame. Additionally, it periodically culls through the current list of associated devices and manually removes and deauthenticates any devices that have been idle for too long.