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Positioning systems and methods for determining the location of a mobile communication device

  • US 10,051,409 B2
  • Filed: 01/27/2015
  • Issued: 08/14/2018
  • Est. Priority Date: 01/27/2015
  • Status: Active Grant
First Claim
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1. A method performed by a positioning system for determining a location of a mobile communication device (MCD), the method comprising:

  • determining a cell in which the MCD is located, said determined cell being served by a base station connected to a set of radio heads, wherein each one of the radio heads included in said set of radio heads is connected to the base station via a cable, and one of said radio heads included in said set is serving the MCD;

    calculating a cable loss value (L_cable) representative of signal attenuation caused by the cable connecting the serving radio head to the base station; and

    determining the location of the MCD based on L_cable, whereincalculating L_cable comprises;

    determining an uplink path loss value (L_ul) representative of the uplink path loss between the MCD and the serving radio head,receiving a power measurement report comprising an uplink transmit power value (P_ul_mcd) indicating the transmit power of an uplink signal transmitted by the MCD,obtaining an amplifier gain value (G_amp) representing the gain of an uplink amplifier of the serving radio head,at least one of (a) obtaining a power value (P_ul_mcd_du) representative of the power of said uplink signal transmitted by the MCD as measured by the base station or (b) obtaining the following values;

    i) a signal to noise and interference ratio of the MCD (SINR_mcd_du) as measured by a digital unit of the base station, ii) an inter-cell interference value (I_du), iii) a thermal noise power value (N0), and iv) a noise factor of a radio unit of the base station (NF_ru), andcalculating the L_cable comprises calculating at least one of;

    P_ul_mcd−

    L_ul+G_amp+P_ul_mcd_du or P_ul_mcd−

    L_ul+G_amp−

    (SINR_mcd_du+I_du+N0+NF_ru).

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