# US 2012/0084587 A1 · Automated Power Management of a Peripheral Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0084587 A1 - Document ID: US20120084587A1 - Status: Published application - Kind: A1 - Application number: 13/325,211 - Filed: 2011-12-14 - Published: 2012-04-05 - Earliest claimed: 2008-02-19 - Assignees: Research In Motion Limited - Inventors: Neil Patrick Adams; Herbert A. Little; Michael McCallum - Web page: https://patentgrep.com/patent/US20120084587A1 ## CPC - G06F 1/266: {Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips} - G06F 1/3203: Power management, i.e. event-based initiation of a power-saving mode - G06F 1/3246: by software initiated power-off - G06F 1/325: {Power saving in peripheral device} - H04L 12/12: Arrangements for remote connection or disconnection of substations or of equipment thereof - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - Y02D 30/70: in wireless communication networks - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 Based on bounds of a period of reduced operation for a base device, a base device generates a power management message for transmission to a peripheral device. In the power management message, the base device inserts bounds of a period of reduced operation for the peripheral device. As a result, the periods of reduced operation conserve battery power in both devices and the two devices may reestablish a communications channel upon reaching the end of the period of reduced operation and resuming normal operations. ## Claims ### Claim 1 A method of managing power at a peripheral device, said method comprising: receiving, from a base device, a power management message, said power management message including an indication of bounds of a period of reduced operation for said peripheral device; according to said indication: reducing operation of said peripheral device at a first time; and resuming operation of said peripheral device at a second time. ### Claim 2 (depends on 1) The method of claim 1 wherein said first time and said second time are included in said power management message as said bounds of said period of reduced operation for said peripheral device. ### Claim 3 (depends on 1) The method of claim 1, wherein said first time closely follows a time of receipt of said power management message; wherein said second time comprises a future time determined by adding a duration to said first time; and wherein an indication of said duration is included in said power management message as one of said bounds of said period of reduced operation for said peripheral device. ### Claim 4 (depends on 1) The method of claim 1 wherein said peripheral device comprises a smart card reader. ### Claim 5 (depends on 1) The method of claim 1 wherein said receiving said power management message occurs over a wireless communication channel. ### Claim 6 (depends on 5) The method of claim 5 wherein said wireless communication channel comprises a Bluetooth™ communication channel. ### Claim 7 (depends on 5) The method of claim 5 wherein implementing said reduced operation comprises terminating maintenance of said wireless communication channel. ### Claim 8 (depends on 1) The method of claim 1 further comprising, subsequent to said resuming operation, reestablishing a previously established communication channel with said second device. ### Claim 9 (depends on 1) The method of claim 1 further comprising, at said first time, suspending a timer related to a cryptographic key. ### Claim 10 (depends on 9) The method of claim 9 further comprising, at said second time, restarting said timer related to said cryptographic key. ### Claim 11 A peripheral device comprising: a processor adapted to: receive, from a base device, said power management message, said power management message including an indication of bounds of a period of reduced operation for said peripheral device; and according to said indication: reduce operation of said peripheral device at a first time; and resume operation of said peripheral device at a second time. ### Claim 12 (depends on 11) The peripheral device of claim 11 wherein said peripheral device comprises a smart card reader. ### Claim 13 (depends on 11) The peripheral device of claim 11 wherein said first time and said second time are included in said power management message as said bounds of said period of reduced operation for said peripheral device. ### Claim 14 (depends on 11) The peripheral device of claim 11, wherein said first time closely follows a time of receipt of said power management message; wherein said second time comprises a future time determined by adding a duration to said first time; and wherein an indication of said duration is included in said power management message as one of said bounds of said period of reduced operation for said peripheral device. ### Claim 15 (depends on 11) The peripheral device of claim 11 further comprising a communication module adapted to receive said power management message over a wireless communication channel. ### Claim 16 (depends on 15) The peripheral device of claim 15 wherein said wireless communication channel comprises a Bluetooth™ communication channel. ### Claim 17 (depends on 15) The peripheral device of claim 15 wherein implementing said reduced operation comprises terminating maintenance of said wireless communication channel. ### Claim 18 (depends on 11) The peripheral device of claim 11 further comprising a communication module adapted to reestablish a previously established communication channel with said second device. ### Claim 19 (depends on 11) The peripheral device of claim 11 wherein said processor is adapted to suspend a timer related to a cryptographic key at said first time. ### Claim 20 (depends on 19) The peripheral device of claim 19 wherein said processor is adapted to restart said timer related to said cryptographic key at said second time. ### Claim 21 A computer readable medium containing computer-executable instructions that, when performed by processor in a peripheral device, cause said processor to: receive, from a base device, a power management message, said power management message including an indication of bounds of a period of reduced operation for said peripheral device; said instructions causing said processor to, according to said indication: reduce operation of said peripheral device at a first time; and resume operation of said peripheral device at a second time.