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    • 2. 发明申请
    • REFERENCE TBTT ESTIMATION ALGORITHM FOR SMART POWER SAVING ON WLAN CLIENT
    • 参考TBTT估计算法,用于WLAN客户端上的智能节电
    • WO2013019886A1
    • 2013-02-07
    • PCT/US2012/049202
    • 2012-08-01
    • QUALCOMM INCORPORATEDMANNEMALA, ChaitanyaFREDERIKS, GuidoKONDA, SudheerCHILLARIGA, Gopal
    • MANNEMALA, ChaitanyaFREDERIKS, GuidoKONDA, SudheerCHILLARIGA, Gopal
    • H04W52/02
    • H04W52/0216H04W52/0229Y02D70/142
    • A WLAN client receives a plurality of beacons that include timestamp values that indicate when the beacons were sent by an access point (AP). The WLAN client calculates a beacon drift value for each of the plurality of received beacons in response to the timestamp values and known physical layer characteristics associated with the WLAN client. The WLAN client selects one of the calculated beacon drift values that represents a minimum beacon drift, and uses this selected beacon drift value (i.e., golden reference target beacon transmission time (RTBTT) estimate) to control the wakeup timing of the WLAN client. The golden RTBTT estimate is updated if a subsequently received beacon exhibits a shorter beacon drift value. If the wakeup wait period of the WLAN client exceeds a predetermined threshold for each of a plurality of received beacons, the golden RTBTT is recalculated to account for the associated increased beacon drift.
    • WLAN客户端接收多个信标,其包括指示信标何时由接入点(AP)发送的时间戳值。 WLAN客户端响应于与WLAN客户端相关联的时间戳值和已知物理层特性,计算多个接收的信标中的每一个的信标漂移值。 WLAN客户端选择表示最小信标漂移的所计算的信标漂移值中的一个,并且使用该选择的信标漂移值(即,黄金参考目标信标发送时间(RTBTT)估计)来控制WLAN客户端的唤醒定时。 如果随后接收到的信标呈现较短的信标漂移值,则更新黄金RTBTT估计。 如果WLAN客户端的唤醒等待时间段对于多个接收到的信标中的每一个超过了预定阈值,则重新计算黄金RTBTT以考虑相关联的增加的信标漂移。