Systems and Methods for Indicating Buffered Data at an Access Point Using an Embedded Traffic Indication Map
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Abstract
Stations in standby mode periodically wake up to check for buffered data at the access points. Traditionally, the information is available by checking the periodic beacon frame for a traffic indication map (TIM). Unfortunately, the length of beacons has steadily increased with the progression of the various wireless standards requiring stations to wake up for longer periods to merely check for buffered data. Several approaches are disclosed which address this shortcoming, including the broadcast of TIM frames, the partial reception of beacon frames and the use of an embedded TIM frame within a beacon frame.
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Citations
51 Claims
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1-28. -28. (canceled)
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29. A method for retrieving buffered data from an access point, the method comprising:
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waking up from a standby mode at a predetermined time relative to a delivery traffic indication map (DTIM) target beacon transmission time (TBTT); receiving a traffic indication map (TIM) frame not disposed within a beacon frame at the predetermined time; retrieving the buffered data in response to an indication by a partial virtual bitmap within the TIM frame; re-entering the standby mode; wherein the TIM frame is received prior to a DTIM beacon frame. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A wireless device for retrieving buffered data from an access point, the wireless device comprising:
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a processor; a memory comprising instructions causing the processor to; wake up from a standby mode at a predetermined time relative to a delivery traffic indication map (DTIM) target beacon transmission time (TBTT); receive a traffic indication map (TIM) frame not disposed within a beacon frame at the predetermined time; retrieve the buffered data in response to an indication by a partial virtual bitmap within the TIM frame; re-enter the standby mode; wherein the TIM frame is received prior to a DTIM beacon frame. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. An access point comprising:
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a processor; a wireless network interface device; a memory comprising instructions causing the processor to; cause the wireless network interface device to transmit a traffic indication map (TIM) frame at a predetermined time relative to a delivery TIM (DTIM) target beacon transmission time (TBTT); wherein the TIM frame is; not disposed within a beacon frame; and received prior to a DTIM beacon frame. - View Dependent Claims (46, 47, 48, 49, 50, 51)
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Specification