| US 7,616,617 B2 | ||
| System and method for communicating beacon transmissions in wireless local area network (WLAN) systems | ||
| Aparna Pandey, Chicago, Ill. (US); Randy L. Ekl, Lake Zurich, Ill. (US); and Christopher G. Ware, Chicago, Ill. (US) | ||
| Assigned to Motorola, Inc., Schaumburg, Ill. (US) | ||
| Filed on Jun. 29, 2006, as Appl. No. 11/427,555. | ||
| Prior Publication US 2008/0002633 A1, Jan. 03, 2008 | ||
| Int. Cl. H04W 4/00 (2009.01) | ||
| U.S. Cl. 370—338 [370/328; 370/329; 455/41.2; 455/41.3; 455/432.1; 455/435.1; 455/435.2] | 15 Claims |
| 1. A method of operation of an access point (AP) for transmitting beacon transmissions to different sectors in a wireless
local area network (WLAN) communications system operating on a plurality of channels comprising:
a) at a first virtual target beacon transmission time (TBTT) transmitting a first beacon signal on a first channel in one
sector, wherein the first virtual TBTT is calculated using a first virtual timing synchronization function (TSF) timer, wherein
the first virtual TSF timer value is calculated using a first channel number of the first channel, an inter-channel offset
and a master TSF timer value, wherein the master TSF timer value comprises a real TSF timer continually recorded at the AP;
b) at a second virtual TBTT transmitting a second beacon signal on at least one second channel in at least one other sector,
wherein the second virtual TBTT is calculated using a second virtual timing synchronization function (TSF) timer, wherein
the second virtual TSF timer value is calculated using a second channel number of the second channel, the inter-channel offset
and the master TSF timer value;
c) repeating a) through b) after a predetermined beacon interval.
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