Patent ID: 7359713
Filing Date: 2008-04-15
Classification: G01S,H04M,H04W,Y02D

Abstract:
1. A mobile communication device comprising: a communication system adapted to receive, over a wireless network, ranging signals for determining a geographical position of the mobile communication device; a location determination system coupled with the communication system, the location determination system adapted to receive the ranging signals and determine a geographical location of the mobile communication device; a battery coupled with the location determination system, the battery adapted to provide power to the mobile communication device; and a state machine coupled with the location determination system, the state machine adapted to (a) determine whether the mobile communication device is in a stopped state or a moving state based on a change in the geographical location of the mobile communication device, as determined by the location determination system; and (b) control a frequency at which the location determination system determines the geographical location based on (i) whether the mobile communication device is in the stopped state or the moving state and (ii) a level of charge stored in the battery, wherein the frequency comprises a first rate, a second rate, and a third rate of determining the geographical location.