Dynamic duty-cycling of processor of mobile device based on operating condition of mobile device

One or more computer-readable non-transitory storage media embodying software that is operable when executed by one or more processors to:

• record a first location of a mobile device;
• determine, by one or more processors of a geographic-positioning component of the mobile device, on a periodic basis, a trajectory of the mobile device, wherein the trajectory is calculated based on present and past user locations;
• determine, by the processors of the geographic-positioning component, whether the trajectory is outside a geographic region defined at least in part by the first location and a radius, wherein the radius is adjusted from a pre-determined value based on:
• a detected velocity of the mobile device;
• time of day information;
• a battery level of the mobile device;
• or
• an error of the first location measurement or the trajectory measurement;
• and
• if the trajectory is outside the geographic region, then send, by the processors of the geographic-positioning component, a message to one or more other processors of the mobile device, the message causing one or more of the other processors to transition from a sleep state to an active state.

A mobile device comprising:

• one or more processors;
• and
• a memory coupled to the processors comprising instructions executable by the processors, the processors being operable when executing the instructions to:
• record a first location of the mobile device;
• determine, by one or more processors of a geographic-positioning component of the mobile device, on a periodic basis, a trajectory of the mobile device, wherein the trajectory is calculated based on present and past user locations;
• determine, by the processors of the geographic-positioning component, whether the trajectory is outside a geographic region defined at least in part by the first location and a radius, wherein the radius is adjusted from a pre-determined value based on:
• a detected velocity of the mobile device;
• time of day information;
• a battery level of the mobile device;
• or
• an error of the first location measurement or the trajectory measurement;
• and
• if the trajectory is outside the geographic region, then send, by the processors of the geographic-positioning component, a message to one or more other processors of the mobile device, the message causing one or more of the other processors to transition from a sleep state to an active state.