Microsoft Technology Licensing, LLC

Mahesh M Pai

Sean Russell Mercer

Charbel Khawand

Radio Frequency (RF) power back-off optimization techniques are described for specific absorption rate (SAR) compliance. A mobile device may be configured to intelligently modify antennas and radio device transmission levels to maintain compliance with SAR limits while minimally perturbing radio operations. The mobile device may implement a SAR optimization scheme that accounts for user presence and signal conditions to maintain compliance. Rather than setting a fixed back-off, user presence detectors may be employed along with information on current signal conditions to determine potential for excessive SAR exposure and selectively apply variable adjustments to RF transmission power (e.g., 'back-offs'), accordingly. The mobile device may also be configured to report SAR conditions and/or mitigation actions to a base station to enable the base station to manage a connection to services based at least in part upon knowledge of SAR actions taken by the mobile computing device.

Radio frequency (RF) power back-off optimization for specific absorption rate (SAR) compliance

Specific Absorption Rate (SAR) mitigation techniques are described herein. In one or more embodiments, a host device is configured to implement a SAR mitigation algorithm to maintain compliance with regulatory requirements. The SAR mitigation algorithm may be configured to control radio frequency transmissions (e.g., output levels) for one or more antennas of the host device based at least in part upon an arrangement of an accessory device relative to the host device. By so doing, the SAR mitigation algorithm accounts for adverse influences that accessory devices may have upon radio frequency (RF) emissions from the antennas in some arrangements. The SAR mitigation algorithm may be further configured to account for user presence indications along with accessory device arrangements and adapt transmission power levels accordingly.

Specific absorption rate mitigation

Devices, systems, and methods of locating a misplaced electronic device using a mobile computer are disclosed herein. In certain examples, the misplaced device is configured to transmit a first plurality of beacons at a first rate, operate in a receive mode between at least one pair of adjacent beacons, receive a wake-up message from the mobile computer over a wireless communication network during the operation in the receive mode, and transmit a second plurality of beacons following receipt of the wake-up message, wherein each beacon in the second plurality of beacons is transmitted at a second rate, the second rate being faster than the first rate. The mobile computing device is configured to receive the first plurality of beacons from the misplaced electronic device, transmit the wake-up message, and receive the second plurality of beacon signals in order to assist in locating the misplaced device.

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Sammamish, WA, United States of America

Mahesh M Pai