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Method and system for determining locations of tags

  • US 9,646,298 B2
  • Filed: 07/30/2015
  • Issued: 05/09/2017
  • Est. Priority Date: 08/18/2014
  • Status: Expired due to Fees
First Claim
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1. A method for determining a location of a tag, the method comprising:

  • receiving in a server a message from a device caused to receive a broadcast from a tag, wherein the device is disposed at a location, the tag is attached to a user moving in an establishment deployed with a plurality of devices, the broadcast includes at least one data packet, the message is generated by a client module being executed in the device in responding to the broadcast, and includes an identity of the tag and an estimated distance determined by the client module in reference to a transmission power of the broadcast received in the device;

    updating a profile created for the user in reference to the received message, wherein the profile includes information pertaining to the identity of the tag; and

    requesting an updated message from the device regarding the tag wherein a movement trajectory of the user is formed in the server by receiving respective messages from some of the devices that have received the broadcast from the tag, the profile is updated with the movement trajectory, and wherein the tag comprises;

    a battery;

    an antenna;

    a wake-up timer to turn on and off operations of the tag per a predefined timing, wherein the tag acts as a transmitter to transmit the broadcast in accordance with a wireless standard;

    a state machine controller provided to randomize data; and

    a direct digital synthesizer provided to synthesize signal waveforms based upon the data provided by the state machine controller and generate data packets for broadcasting via the antenna.

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