# US 9,521,623 B2 · Dynamic duty-cycling of processor of mobile device based on operating condition of mobile device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,623 B2 - Document ID: US9521623B2 - Status: Granted - Kind: B2 - Application number: 14/524,840 - Filed: 2014-10-27 - Published: 2015-02-12 - Granted: 2016-12-13 - Earliest claimed: 2012-03-09 - Assignees: Facebook, Inc. - Applicants: Facebook, Inc. - Inventors: Matthew Nicholas Papakipos; Lev Popov; Iain Andrew Russell Proctor - Web page: https://patentgrep.com/patent/US9521623B2 ## CPC - H04L 51/222: using geographical location information, e.g. messages transmitted or received in proximity of a certain spot or area - G01S 19/34: Power consumption - G06F 21/629: {to features or functions of an application} - G06F 21/81: by operating on the power supply, e.g. enabling or disabling power-on, sleep or resume operations - H04L 51/52: for supporting social networking services - H04L 67/10: in which an application is distributed across nodes in the network (software deployment G06F8/60; multiprogramming arrangements G06F9/46) - H04L 67/306: User profiles - H04L 67/52: specially adapted for the location of the user terminal - H04W 4/021: Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences - H04W 4/027: {using movement velocity, acceleration information} - H04W 52/0241: {where no transmission is received, e.g. out of range of the transmitter} - H04W 52/0254: {detecting a user operation or a tactile contact or a motion of the device} - H04W 52/0258: {controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day} - G06F 2221/2111: Location-sensitive, e.g. geographical location, GPS - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract In one embodiment, a method includes recording a first location of a mobile device; determining, by 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; determining, by the geographic-positioning component, whether the trajectory is outside a geographic region defined at least in part by the first location; and if the trajectory is outside the geographic region, then transmitting, 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. ## Claims ### Claim 1 A method comprising: recording a first location of a mobile device; determining, 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; determining, 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 sending, 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the message identifies the trajectory. ### Claim 3 (depends on 1) The method of claim 1, wherein the first location is based at least in part on: a global positioning system (GPS) signal; a Wi-Fi signal; or a cellular radio signal. ### Claim 4 (depends on 1) The method of claim 1, wherein the first location or the trajectory is based at least in part on user-submitted location data. ### Claim 5 (depends on 4) The method of claim 4, wherein the user-submitted location data comprises social-networking information submitted by using social-networking functionality. ### Claim 6 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. ### Claim 7 (depends on 6) The media of claim 6, wherein the message identifies the trajectory. ### Claim 8 (depends on 6) The media of claim 6, wherein the first location or the trajectory is based at least in part on user-submitted location data. ### Claim 9 (depends on 8) The media of claim 8, wherein the user-submitted location data comprises social-networking information submitted by using social-networking functionality. ### Claim 10 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. ### Claim 11 (depends on 10) The mobile device of claim 10, wherein the message identifies the trajectory. ### Claim 12 (depends on 10) The mobile device of claim 10, wherein the first location or the trajectory is based at least in part on user-submitted location data. ### Claim 13 (depends on 12) The mobile device of claim 12, wherein the user-submitted location data comprises social-networking information submitted by using social-networking functionality. ### Claim 14 (depends on 1) The method of claim 1, wherein: the geographic region is further defined by one or more entities of a social-networking system; a user of the mobile device is a user of the social-networking system; and the user is associated with one or more entities through the social-networking system. ### Claim 15 (depends on 14) The method of claim 14, wherein the one or more entities comprise geographic locations associated with the user. ### Claim 16 (depends on 14) The method of claim 14, wherein the one or more entities comprise another user of the social-networking system. ### Claim 17 (depends on 6) The media of claim 6, wherein: the geographic region is further defined by one or more entities of a social-networking system; a user of the mobile device is a user of the social-networking system; and the user is associated with one or more entities through the social-networking system. ### Claim 18 (depends on 17) The media of claim 17, wherein the one or more entities comprise: geographic regions associated with the user; or another user of the social-networking system. ### Claim 19 (depends on 10) The device of claim 10, wherein: the geographic region is further defined by one or more entities of a social-networking system; a user of the mobile device is a user of the social-networking system; and the user is associated with one or more entities through the social-networking system. ### Claim 20 (depends on 19) The device of claim 19, wherein the one or more entities comprise: geographic regions associated with the user; or another user of the social-networking system.