Patent ID: 8738043
Filing Date: 2014-05-27
Classification: H04W

Abstract:
1. A method for constructing a wireless AP (Access Point) map at a server connected over a network with a user terminal, the method comprising: receiving wireless signal information collected from each of a plurality of user terminals, the wireless signal information including a signal strength of each of a plurality of wireless AP's received by each user terminal; estimating a distance of each of the plurality of wireless AP's by using the wireless signal information; and constructing a wireless AP map by using the estimated distances, wherein the estimating the distance of each of the plurality of wireless AP's includes: wherein the estimating of the distance between the first wireless AP and the second wireless AP includes: wherein the estimating of the first distance includes assuming that the first wireless AP is positioned on a first circle having the first distance as a radius and the first user terminal as a center to estimate the first distance, the estimating of the second distance includes assuming that the second wireless AP is positioned on a second circle having the second distance as a radius and the first user terminal as a center to estimate the second distance, wherein the estimating of the distance between the first and second wireless AP's includes: