Method for ranging to a station in power saving mode
First Claim
1. In a wireless network having a server coupled to a plurality of access points (APs) in which one of the APs is currently associated with a wireless station (STA) and one or more of the APs are not currently associated with the STA, a method of performing ranging operations between a non-associated AP and the STA, the method comprising:
- receiving, in the non-associated AP, a request to obtain a timer value of the associated AP and to range the STA from the non-associated AP;
sending a probe request from the non-associated AP to the associated AP, the probe request requesting the timer value of the associated AP;
receiving a probe response from the associated AP, wherein the probe response includes the timer value of the associated AP;
deriving, in the non-associated AP, a beacon transmission schedule of the associated AP from the timer value of the associated AP;
determining, in the non-associated AP, wake-up periods during which the STA is scheduled to wake up from a power save mode based, at least in part, on the derived beacon transmission schedule of the associated AP; and
ranging the STA from the non-associated AP during the wake-up periods.
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Accused Products
Abstract
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.
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Citations
30 Claims
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1. In a wireless network having a server coupled to a plurality of access points (APs) in which one of the APs is currently associated with a wireless station (STA) and one or more of the APs are not currently associated with the STA, a method of performing ranging operations between a non-associated AP and the STA, the method comprising:
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receiving, in the non-associated AP, a request to obtain a timer value of the associated AP and to range the STA from the non-associated AP; sending a probe request from the non-associated AP to the associated AP, the probe request requesting the timer value of the associated AP; receiving a probe response from the associated AP, wherein the probe response includes the timer value of the associated AP; deriving, in the non-associated AP, a beacon transmission schedule of the associated AP from the timer value of the associated AP; determining, in the non-associated AP, wake-up periods during which the STA is scheduled to wake up from a power save mode based, at least in part, on the derived beacon transmission schedule of the associated AP; and ranging the STA from the non-associated AP during the wake-up periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless positioning system having a server coupled to a plurality of access points (APs) in which one of the APs is currently associated with a wireless station (STA) and one or more of the APs are not currently associated with the STA, at least one non-associated AP comprising:
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a first processor; and a first memory storing instructions that, when executed by the first processor, cause the non-associated AP to perform operations comprising; receiving, in the non-associated AP, a request to obtain a timer value of the associated AP and to range the STA from the non-associated AP; sending a probe request from the non-associated AP to the associated AP, the probe request requesting the timer value of the associated AP; receiving a probe response from the associated AP, wherein the probe response includes the timer value of the associated AP; deriving, in the non-associated AP, a beacon transmission schedule of the associated AP from the timer value of the associated AP; determining, in the non-associated AP, wake-up periods during which the STA is scheduled to wake up from a power save mode based, at least in part, on the derived beacon transmission schedule of the associated AP; and ranging the STA from the non-associated AP during the wake-up periods. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An access point (AP) that is not associated with a wireless station (STA), the non-associated AP comprising:
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a processor; and a memory storing instructions that, when executed by the processor, cause the non-associated AP to perform operations comprising; receiving, in the non-associated AP, a request to obtain a timer value of another AP that is associated with the STA and to range the STA from the non-associated AP; sending a probe request from the non-associated AP to the associated AP, the probe request requesting the timer value of the associated AP; receiving a probe response from the associated AP, wherein the probe response includes the timer value of the associated AP; deriving, in the non-associated AP, a beacon transmission schedule of the associated AP from the timer value of the associated AP; determining, in the non-associated AP, wake-up periods during which the STA is scheduled to wake up from a power save mode based, at least in part, on the derived beacon transmission schedule of the associated AP; and ranging the STA from the non-associated AP during the wake-up periods. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification