Patent ID: 8892390
Filing Date: 2014-11-18
Classification: G01P,G06F,H04W

Abstract:
1. A method performed by a mobile device, the method comprising: receiving accelerometer data from accelerometer sensors onboard the mobile device, wherein the accelerometer data comprises tri-axial accelerometer samples and represents acceleration of the mobile device in three-dimensional space; determining, by one or more processors of the mobile device, an accelerometer signal vector representing at least a force due to gravity on the mobile device; calculating, by the one or more processors of the mobile device, two-dimensional accelerometer data orthogonal to the accelerometer signal vector, including: determining, by the one or more processors of the mobile device, a motion state of the mobile device based on the two-dimensional accelerometer data, wherein determining the motion state includes determining at least one of whether the mobile device has a vertical movement motion state or whether the mobile device has a horizontal movement motion state.