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公开(公告)号：US08982774B2
公开(公告)日：2015-03-17
申请号：US13534837
申请日：2012-06-27
CPC分类号： G01S1/20 , G01S5/0205 , G01S5/14 , H04W48/16 , H04W52/00 , H04W52/02 , H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/164
摘要： A network based positioning (NBP) system is disclosed that allows any of its access points (APs) to initiate ranging operations with a station device (STA), regardless of whether the STA is in power save mode and regardless of whether a particular AP is currently associated with the STA. For example, to initiate ranging operations with the STA from a non-associated AP, the non-associated AP obtains the TSF timer of the associated AP, and then uses the obtained TSF timer to derive the associated AP's beacon transmission schedule and thereby determine when the STA's corresponding wake-up periods occur. Thereafter, the non-associated AP can initiate ranging operations with the STA during the STA wake-up periods, thereby ensuring that probes sent from the non-associated AP will arrive at the STA while the STA is awake from power save mode.
摘要翻译： 公开了一种基于网络的定位（NBP）系统，其允许其任何接入点（AP）与站设备（STA）发起测距操作，而不管STA是否处于省电模式，并且不管特定AP是否是 目前与STA相关联。 例如，为了从非关联AP发起与STA的测距操作，非关联AP获取相关AP的TSF定时器，然后使用获得的TSF定时器来导出相关联的AP的信标传输调度，从而确定何时 STA的相应的唤醒周期发生。 此后，非关联AP可以在STA唤醒周期期间与STA发起测距操作，从而确保从非关联AP发送的探测将到达STA，同时STA从节电模式唤醒。
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2.发明授权公开(公告)号：US08743727B2
公开(公告)日：2014-06-03
申请号：US13474284
申请日：2012-05-17
IPC分类号： H04W24/00
CPC分类号： G01S5/0236 , G01S5/14 , G01S13/876
摘要： A wireless local area network (WLAN) positioning system is disclosed that allows the WLAN system to determine the location attributes of a client device operating in a power save mode, operating on a different channel than the WLAN's access points, and/or operating in an ad-hoc mode. The client device periodically performs scanning operations during which beacon frames broadcast by a selected AP(s) can be received. The client device parses information embedded in the beacon frames, and in response thereto selectively initiates ranging operations to determine its location attributes. After determining its location attributes, the client devices sends the location attributes back to the selected AP(s).
摘要翻译： 公开了一种无线局域网（WLAN）定位系统，其允许WLAN系统确定在节电模式下操作的客户端设备的位置属性，其操作在与WLAN的接入点不同的信道上，和/或以 特设模式。 客户端设备周期性地执行扫描操作，由此可以接收由所选择的AP广播的信标帧。 客户端设备解析嵌入在信标帧中的信息，响应于此，有选择地启动测距操作以确定其位置属性。 在确定其位置属性之后，客户端设备将位置属性发送回所选择的AP。
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公开(公告)号：US20140003310A1
公开(公告)日：2014-01-02
申请号：US13534837
申请日：2012-06-27
IPC分类号： G01S1/20
CPC分类号： G01S1/20 , G01S5/0205 , G01S5/14 , H04W48/16 , H04W52/00 , H04W52/02 , H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/164
摘要： A network based positioning (NBP) system is disclosed that allows any of its access points (APs) to initiate ranging operations with a station device (STA), regardless of whether the STA is in power save mode and regardless of whether a particular AP is currently associated with the STA. For example, to initiate ranging operations with the STA from a non-associated AP, the non-associated AP obtains the TSF timer of the associated AP, and then uses the obtained TSF timer to derive the associated AP's beacon transmission schedule and thereby determine when the STA's corresponding wake-up periods occur. Thereafter, the non-associated AP can initiate ranging operations with the STA during the STA wake-up periods, thereby ensuring that probes sent from the non-associated AP will arrive at the STA while the STA is awake from power save mode.
摘要翻译： 公开了一种基于网络的定位（NBP）系统，其允许其任何接入点（AP）与站设备（STA）发起测距操作，而不管STA是否处于省电模式，并且不管特定AP是否是 目前与STA相关联。 例如，为了从非关联AP发起与STA的测距操作，非关联AP获取相关AP的TSF定时器，然后使用获得的TSF定时器来导出相关联的AP的信标传输调度，从而确定何时 STA的相应的唤醒周期发生。 此后，非关联AP可以在STA唤醒周期期间与STA发起测距操作，从而确保从非关联AP发送的探测将到达STA，同时STA从节电模式唤醒。
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