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Method and system for determining the existence of broadcast and multicast frames buffered in an access point

  • US 9,363,648 B2
  • Filed: 12/17/2014
  • Issued: 06/07/2016
  • Est. Priority Date: 01/12/2007
  • Status: Active Grant
First Claim
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1. A method for transmitting a frame in a wireless local area Network (WLAN), the method comprising:

  • in an access point (AP) shared by multiple virtual APs wherein each of the multiple virtual APs is associated with one of multiple Basic Service Set Identities (BSSIDs), or, the AP is associated with the multiple BSSIDs;

    setting, by the AP, an element corresponding to each of the multiple BSSIDs and a Partial Virtual Bitmap in a Beacon frame;

    wherein the Partial Virtual Bitmap includes a plurality of broadcast/multicast indication bits, each broadcast/multicast indication bit corresponding to a respective BSSID of the multiple BSSIDs, and each broadcast/multicast indication bit is used to indicate whether there is a group addressed broadcast/multicast frame buffered in the AP for a Station (STA), which is associated with the respective BSSID of the multiple BSSIDs; and

    wherein an element in the beacon frame includes an index field and a delivery traffic indication message (DTIM) Count field, the index field is configured to identify a BSSID among the multiple BSSIDs, the DTIM Count field is associated with the BSSID identified by the index field, and the DTIM Count field is configured to notify the STA whether the Beacon frame is a DTIM Beacon, which is used to notify the STA when to wake up to receive the buffered broadcast/multicast frame; and

    sending out the Beacon frame.

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