Patent ID: 9234965
Filing Date: 2016-01-12
CPC Classification: G01C,G01S,G08B,G09B

Claim Text:
1. A method for position estimation, the method comprising: receiving, by a location server, a request for reference information from a wireless network device located in an indoor environment, wherein the indoor environment also includes a first access point; determining, by the location server, whether the location server is located in a same indoor environment as the first access point and the wireless network device based, at least in part, on a value stored at the location server; in response to determining that the location server is located in the same indoor environment, determining, by the location server, an altitude of the first access point and a pressure at the first access point; and transmitting, by the location server, the altitude of the first access point and the pressure at the first access point to the wireless network device for the wireless network device to determine its altitude in the indoor environment.