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    • 82. 发明申请
    • ACCESS POINT-ASSISTED POSITIONING FRAMEWORK
    • 访问点辅助定位框架
    • US20140334401A1
    • 2014-11-13
    • US14267717
    • 2014-05-01
    • QUALCOMM Incorporated
    • Xiaoxin ZhangSandip HomchaudhuriCarlos Horacio Aldana
    • H04W72/12
    • G01S5/0236G01S5/0226H04W56/002H04W64/00
    • Methods, systems, and devices are described for a wireless positioning framework in which an access point (AP) broadcasts a message within a beacon interval that identifies a transmission schedule for a set of stations. The message may include an information element identifying the stations in the set. The set may be determined based on station clock drifts and/or a ranging accuracy sought by the AP. The AP may also provide a station identifier, and frame spacing and delay parameters, which may be used to determine a distinct backoff for each station. Using distinct backoffs allow the stations to avoid collisions when sending the transmissions. The AP may receive the transmissions according to the identified schedule and may determine a range (e.g., round-trip time) for each station in the set based at least on a time at which the respective transmission is received.
    • 对于无线定位框架描述了方法,系统和设备,其中接入点(AP)在标识一组站的传输调度的信标间隔内广播消息。 消息可以包括识别集合中的站的信息元素。 该集合可以基于AP所寻求的站时钟漂移和/或测距精度来确定。 AP还可以提供站标识符和帧间隔和延迟参数,其可以用于确定每个站的不同的退避。 使用不同的后退允许站点在发送传输时避免冲突。 AP可以根据所识别的调度接收传输,并且可以至少基于接收相应传输的时间来确定该组中每个站的范围(例如,往返时间)。