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Efficient generation of radio coverage map of access points in an indoor environment

  • US 9,037,131 B2
  • Filed: 01/23/2013
  • Issued: 05/19/2015
  • Est. Priority Date: 01/23/2013
  • Status: Expired due to Fees
First Claim
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1. A method for generating a radio coverage map for an access point in a wireless environment comprising a plurality of physical levels including a first physical level and a second physical level located above the first physical level, the method comprising:

  • generating, by one of a location assistance server, mobile station, or generation module, a two-dimensional radio coverage map located between the first physical level and the second physical level without taking into account a signal attenuation caused by the second physical level, the access point being located above the second physical level, the two-dimensional radio coverage map being located at a target distance from the access point and comprising a plurality of map points, each of the map points having a predicted received signal strength value;

    determining a projection window located at a same vertical level as the second physical level;

    determining a projected area on the two-dimensional radio coverage map by computing a geometrical projection from the access point through the projection window onto the two-dimensional radio coverage map;

    identifying a plurality of first points in a first area on the two-dimensional radio coverage map, the first area being outside the projected area, each of the first points having a predicted received signal strength value; and

    reducing the predicted received signal strength value of each of the first points by a value equal to the signal attenuation caused by the second physical level.

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