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Transponder subsystem for supporting location awareness in wireless networks

  • US 7,289,815 B2
  • Filed: 08/06/2003
  • Issued: 10/30/2007
  • Est. Priority Date: 08/15/2002
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising means for determining the geolocation of a wireless communication device within a wireless network, the means for determining comprising:

  • at least two transponder units with a reduced medium access control stack unit being reduced to comprise allowing only acknowledgment of unicast data frames addressed to a particular one of said transponder units to provide location-sensing information, and for communicating with the communication device when the communication device is situated in a coverage area of the wireless network; and

    a processing unit for deriving the geolocation of the communication device within the coverage area in dependence on information received from the transponder units, wherein one transponder unit comprises a reduced a-type medium access (a-type MAC) stack unit implemented with one of a microprocessor and a field programmable gate array, said a-type medium access (a-type MAC) stack unit to filter incoming data frames for error-free reception and correct MAC address, and to pass an acknowledgment frame after a short interframe space to a physical-layer (PHY-layer) for transmission.

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