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Locating user equipment in a wireless network

  • US 9,553,639 B2
  • Filed: 08/28/2014
  • Issued: 01/24/2017
  • Est. Priority Date: 12/09/2013
  • Status: Active Grant
First Claim
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1. A method of locating user equipment (UE) in a wireless communication network, the method comprising:

  • detecting signaling of a UE via multiple wireless access points in the wireless communication network while the UE is in an offline phase;

    training the wireless access points with the UE while the UE is in the offline phase;

    storing signatures via said training with the UE, each stored signature comprising signal strength and Multiple Input/Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) channel estimation information for the multiple wireless access points;

    normalizing the MIMO-OFDM channel estimation information of the stored signatures by multiplying antenna orientations of the UE to a ratio of maximum antenna gain of the UE towards each wireless access point;

    detecting that the UE has entered an online phase;

    comparing MIMO-OFDM channel estimation and signal strength information of the UE for each of the wireless access points, while the UE is in the online phase, to the stored signatures; and

    determining a location of the UE in the wireless communication network based on the comparisons.

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