Patent ID: 8428098
Filing Date: 2013-04-23
Classification: G01S,H04W

Abstract:
1. A method for determining the geographical location of a user device coupled to a communication network, comprising: obtaining a network path to the user device; obtaining a first last hop network device in the network path to the user device; obtaining a first geographical location of the first last hop network device; obtaining a plurality of pairs of ping times to the user device and corresponding ping times to the first last hop network device; obtaining a smallest time difference among the plurality of pairs of ping times to the user device and corresponding ping times to the first last hop network device; determining a distance for a last leg path between the first last hop network device and the user device using, at least in part, the smallest time difference obtained; and determining a first user device geographical location for the user device based on the geographical location of the first last hop network device and the last leg path distance.