# US 9,521,630 B2 · Low power chaining > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,630 B2 - Document ID: US9521630B2 - Status: Granted - Kind: B2 - Application number: 15/045,702 - Filed: 2016-02-17 - Published: 2016-06-09 - Granted: 2016-12-13 - Earliest claimed: 2014-11-06 - Assignees: AT&T Mobility II LLC; AT&T Intellectual Property I, L.P. - Applicants: AT&T Mobility II, LLC; AT&T Intellectual Property I, LP - Inventors: Jeremy Fix; Sheldon Kent Meredith; Rudolph Louis Mappus, IV - Web page: https://patentgrep.com/patent/US9521630B2 ## CPC - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 52/283: {Power depending on the position of the mobile} - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 52/383: {power control in peer-to-peer links} - H04B 17/23: Indication means, e.g. displays, alarms, audible means - H04B 17/27: for locating or positioning the transmitter - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A group of low power transceiver devices may create a private wireless network. In a private communication network, each device may monitor neighboring devices and transmit a low power signal on a periodic basis. At any time, if a device breaks away from the private communication network, the device determines its location and then transmits its location to one or more devices in the group at a high transmit power level. ## Claims ### Claim 1 A computer readable storage medium comprising computer executable instructions that when executed by a computing device cause said computing device to effectuate operations comprising: searching, by a first device, for a signal, the signal indicative of a status of a second device; determining that the signal has not been detected within a first period; and responsive to the determining that the signal has not been detected within the first period, determining a location of the first device, and transmitting, at a first transmit power, an alert comprising the location to the second device, the first transmit power greater than a second transmit power of the first period. ### Claim 2 (depends on 1) The computer readable storage medium of claim 1, wherein the first transmit power is approximately a maximum transmit power of the first device. ### Claim 3 (depends on 1) The computer readable storage medium of claim 1, wherein the first transmit power is substantially higher than the second transmit power. ### Claim 4 (depends on 1) The computer readable storage medium of claim 1, wherein determining of the location of the first device is based on a global positioning system of the first device, the global positioning system of the first device is activated responsive to the determining that the signal from the second device has not been detected within the first period, wherein the global positing system is not active during the first period. ### Claim 5 (depends on 1) The computer readable storage medium of claim 1, the operations further comprising: detecting, by the first device, the signal from the second device; and deactivating a global position system on the first device responsive to the detecting the signal from the second device. ### Claim 6 (depends on 1) The computer readable storage medium of claim 1, wherein the determining of the location of the first device is based on a global positioning system of a third device. ### Claim 7 (depends on 1) The computer readable storage medium of claim 1, the operations further comprising: broadcasting the alert to a plurality of devices, the plurality of devices comprising the second device. ### Claim 8 A mobile device comprising: a processor; and a memory coupled with the processor, the memory having stored thereon executable instructions that when executed by the processor cause the processor to effectuate operations comprising: searching for a signal, the signal indicative of a status of a first device; determining that the signal has not been detected within a first period; and responsive to the determining that the signal from the first device has not been detected within the first period, determining a location of the mobile device, and transmitting, at a first transmit power, an alert comprising the location to the first device, the first transmit power greater than a second transmit power of the first period. ### Claim 9 (depends on 8) The mobile device of claim 8, wherein the second transmit power is approximately a maximum transmit power of the mobile device. ### Claim 10 (depends on 8) The mobile device of claim 8, wherein the second transmit power is substantially higher than the first transmit power. ### Claim 11 (depends on 8) The mobile device of claim 8, wherein determining of the location of the mobile device is based on a global positioning system of the mobile device, the global positioning system of the mobile device is activated responsive to the determining that the signal from the first device has not been detected within the first period. ### Claim 12 (depends on 8) The mobile device of claim 8, wherein the operations further comprise: detecting the signal from the first device; and deactivating a global position system on the mobile device based on the signal from the first device. ### Claim 13 (depends on 8) The mobile device of claim 8, wherein the determining of the location of the mobile device is based on a global positioning system of a third device. ### Claim 14 (depends on 8) The mobile device of claim 8, wherein the operations further comprise: broadcasting the alert to a plurality of devices, the plurality of devices comprising the first device. ### Claim 15 A method comprising: searching, by a first device, for a signal, the signal indicative of a status of a second device; determining, by the first device, that the signal has not been detected within a first period; and responsive to the determining that the signal has not been detected within the first period, determining, by the first device, a location of the first device, and transmitting, at a first transmit power by the first device, an alert comprising the location to the second device, the first transmit power greater than a second transmit power of the first period. ### Claim 16 (depends on 15) The method of claim 15, wherein the first transmit power is approximately a maximum transmit power of the first device. ### Claim 17 (depends on 15) The method of claim 15, wherein the first transmit power is substantially higher than the second transmit power. ### Claim 18 (depends on 15) The method of claim 15, wherein determining of the location of the first device is based on a global positioning system of the first device, the global positioning system of the first device is activated responsive to the determining that the signal from the second device has not been detected within the first period, wherein the global positing system is not active during the first period. ### Claim 19 (depends on 15) The method of claim 15, further comprising: detecting, by the first device, the signal from the second device; and deactivating a global position system on the first device responsive to the detecting the signal from the second device. ### Claim 20 (depends on 15) The method of claim 15, further comprising: broadcasting the alert to a plurality of devices, the plurality of devices comprising the second device.