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Method for ranging to a station in power saving mode

  • US 8,982,774 B2
  • Filed: 06/27/2012
  • Issued: 03/17/2015
  • Est. Priority Date: 06/27/2012
  • Status: Expired due to Fees
First Claim
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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:

  • 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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