80 results about "Rf exposure" patented technology

Methods, systems, and devices for wireless communications are described for radio frequency (RF) exposure limit compliance using uplink duty cycling. A user equipment (UE) may transmit a buffer status report (BSR) that indicates an amount of data that is to be transmitted by the UE, where lower priority data reported in the BSR may be throttled in order to reduce an amount of uplink resources associated with the lower priority data and thereby adjust an uplink duty cycle of the UE. The reduced uplink duty cycle may provide for additional transmit power that is available for higher priority data transmissions.

An electronic device may include radios that transmit signals using antennas. Control circuitry may assign radio-frequency exposure (RFE) budgets to the radios. The control circuitry may classify and predict attributes of application data for transmission over the radios, may generate a per-radio data prediction based on the classified attributes, and may generate the RFE budgets based on the classified attributes. Each radio may transmit application data based on its data prediction and according to its RFE budget. A dynamic portion of the RFE budget may be reserved for control signaling. RFE planning in this way may ensure that the device optimally utilizes its RFE budget, increasing overall RFE during some time periods so sufficient transmit power is available, and ensuring that RFE is distributed across the radios depending on the amount and criticality of the data to be transmitted by each radio.

Techniques and apparatus for radio frequency (RF) exposure compliance based on subband transmit power limits are described. An example method that may be performed by a wireless device includes determining a transmit frequency band of at least one radio of the wireless device for transmission of a signal having an operating transmit frequency in the transmit frequency band. A transmit power limit associated with a subband in the transmit frequency band is determined based at least in part on the transmit frequency band. The operating transmit frequency of the signal is in the subband. The signal is transmitted using the at least one radio at a transmit power determined based at least in part on the transmit power limit in compliance with an RF exposure limit.

Techniques and apparatus for radio frequency (RF) exposure compliance for multiple-input, multiple-output (MIMO) transmissions are described. An example method that may be performed by a wireless device includes determining a respective multiple-input, multiple-output (MIMO) transmit power limit for each of a plurality of antennas of the wireless device. A signal associated with a MIMO transmission is transmitted from each antenna at a respective first transmission power level based on the respective MIMO transmit power limit for the antenna in compliance with a radio frequency (RF) exposure limit. The first transmission power level used for a first antenna of the plurality of antennas is different from the first transmission power level used for a second antenna of the plurality of antennas.

Certain aspects of the present disclosure provide techniques for radio frequency (RF) exposure with antenna grouping. An example method for grouping antennas for RF exposure compliance by a processing system generally includes determining RF exposure distributions per transmit antenna configuration for a plurality of transmit antennas and assigning the plurality of transmit antennas to a plurality of antenna groups based on the RF exposure distributions.

A method for adjusting a transmitting (TX) power ratio of a radio module includes: separating multiple radio modules into multiple radio groups according to a radiofrequency (RF) regulation, wherein the multiple radio modules comprise the radio module; mapping an RF exposure limit to a TX power limit; interacting with at least one other radio module for adjusting the TX power ratio, to obtain at least one adjusted TX power ratio, wherein the radio module and the at least one other radio module are comprised in a same radio group of the multiple radio groups; and adjusting the TX power limit according to the at least one adjusted TX power ratio, to generate an adjusted TX power limit of the radio module.

Methods and apparatus for dynamic transmission power limit adjustment over antenna tuner states with radio frequency (RF) exposure compliance are described. An example method includes determining RF exposure characterizations per (i) transmit scenario supported by a wireless device and (ii) tuner code setting associated with a tuner (s) coupled to a transmit antenna (s) of the wireless device. A respective transmit power limit is determined for the transmit antenna (s) for each transmit scenario and tuner code setting, in compliance with an RF exposure limit, based at least on the RF exposure characterizations. Indications of the transmit power limits are stored. In some example methods, a signal is transmitted from the transmit antenna (s) of a wireless device at a transmission power level based on the indications of the transmit power limits, in compliance with an RF exposure limit.

Techniques for wireless communication are disclosed. In one aspect, a user equipment (UE) transmits one or more reference signals on one or more transmit beams in at least one direction or according to at least one characteristic, the at least one direction or the at least one characteristic reducing radio frequency exposure to one or more body regions of one or more users within a threshold distance of the UE, wherein each of the one or more body regions corresponds to a three-dimensional space estimated to contain at least a portion of the body of one or more users.

Techniques and apparatus for radio frequency (RF) exposure compliance based on subband transmit power limits are described. An example method that may be performed by a wireless device includes determining a transmit frequency band of at least one radio of the wireless device for transmission of a signal having an operating transmit frequency in the transmit frequency band. A transmit power limit associated with a subband in the transmit frequency band is determined based at least in part on the transmit frequency band. The operating transmit frequency of the signal is in the subband. The signal is transmitted using the at least one radio at a transmit power determined based at least in part on the transmit power limit in compliance with an RF exposure limit.

In certain aspects, a method for wireless communication includes transmitting a first transmission with a first transmitter operable according to a first radio technology, and transmitting a second transmission with a second transmitter after completion of the first transmission, the second transmitter operable according to a second radio technology. The method may also include delaying transmission of the second transmission by a predetermined wait time after completion of the first transmission if the first radio technology is a radio frequency (RF) exposure time-averaged technology and the second radio technology is a non-time-averaged RF exposure technology. The method may also include transmitting the second transmission with a limited peak power for a predetermined time period for at least a portion of the second transmission if the first radio technology is a non-time-averaged RF exposure technology and the second radio technology is a time-averaged RF exposure technology.

The invention relates to a system and method for controlling radio frequency exposure. A wireless network may include a base station and a user equipment (UE). The UE may transmit an uplink (UL) signal to the base station using a maximum UL duty cycle that may be dynamically adjusted. When the UE identifies that a user is in proximity to the UE, the UE may transmit an indicator to the base station. The indicator may identify that a radio frequency exposure (RFE) event has occurred and / or a suggested maximum UL duty cycle that will allow the UE to meet a limit for RFE. The base station may limit UL grants for the UE such that the UE performs subsequent communications using the suggested maximum UL duty cycle or a different maximum UL duty cycle. Coordinating adjustments of UL duty cycle in this manner may allow the UE to meet limits for RFE without requiring the UE to perform maximum transmission power level reduction.

Techniques and apparatus for radio frequency (RF) exposure compliance based on spatial information of RF exposure contributions among antennas of a wireless device are described. An example method generally includes accessing RF exposure contribution information associated with a plurality of antennas of the wireless device. At least one time-averaging operation is performed for at least a first antenna, based on the RF exposure contribution information. A transmit power limit is determined for the first antenna, based on the at least one time-averaging operation. A signal is transmitted from the first antenna at a transmission power level determined based at least in part on the transmit power limit in compliance with an RF exposure limit.

Certain aspects of the present disclosure provide techniques and apparatus for multi-connection radio frequency (RF) exposure compliance. An example method of wireless communication includes obtaining a transmit power budget associated with a time interval. The method also includes determining transmit power in a connection-by-connection manner among a plurality of connections based at least in part on the transmit power budget and one or more characteristics associated with the plurality of connections. The method also includes transmitting signals associated with the connections at respective transmit powers within the time interval.

Methods and apparatus for radio frequency (RF) exposure compliance across antenna grouping transitions are described. An example method includes transitioning, during a run-time of a wireless device, from operating according to a first transmit scenario with a first set of antenna groups for a plurality of transmit antennas to operating according to a second transmit scenario with a second set of antenna groups, while maintaining compliance with an RF exposure limit across the transition. The transitioning includes determining the second set of antenna groups, such that an RF exposure history associated with the first set of antenna groups for the plurality of transmit antennas is maintained for the second set of antenna groups across the transition. The method also includes transmitting, from at least one transmit antenna in the second set of antenna groups, while operating according to the second transmit scenario.

In some aspects, a method for wireless communication includes transmitting a first transmission using a first transmitter operable according to a first radio technology and, after completion of the first transmission, transmitting a second transmission using a second transmitter operable according to a second radio technology. The method may also include, if the first radio technology is a radio frequency (RF) exposure time-averaged technology and the second radio technology is a non-time-averaged RF exposure technology, delaying transmission of the second transmission by a predetermined wait time after completion of the first transmission. The method may also include, if the first radio technology is a non-time-averaged RF exposure technology and the second radio technology is a time-averaged RF exposure technology, transmitting the second transmission using limited peak power for a predetermined time period of at least a portion of the second transmission.

An apparatus receives at least one scheduling grant scheduling transmission on a first data channel and further scheduling a second data channel. The apparatus reduces a transmit power for the transmission on the first data channel with a first beam when a radio frequency (RF) exposure event occurs. The apparatus increases, after the RF exposure event occurs, a transmit power for the transmission on the second data channel with a second beam. The apparatus transmits an RF exposure report associated with at least one of the first data channel or the first beam to the base station.

Techniques and apparatus are provided for operating a wireless device in accordance with RF exposure compliance. One example method generally includes, when an RFECS1 of a wireless device is in an online state, determining whether the wireless device is in an online state, if the RF exposure limit is met and based on at least one of first RF exposure information associated with one or more first radio components associated with a first RAT or second RF exposure information associated with one or more second radio components associated with a second RAT, the RF exposure limit is determined based on the at least one of the first RF exposure information associated with the one or more first radio components associated with the first RAT or the second RF exposure information associated with the one or more second radio components associated with the second RAT. Controlling at least one of the one or more first radio components or the one or more second radio components via RFECS1; and when the RFECS1 is unavailable, controlling one or more second radio components associated with a second RAT via a second RF exposure control scheme in the event that the RF exposure limit is met and based on third RF exposure information associated with the one or more second radio components.

Methods and apparatus for dynamic transmission power limit adjustment over antenna tuner states with radio frequency (RF) exposure compliance are described. An example method includes determining RF exposure characterizations per (i) transmit scenario supported by a wireless device and (ii) tuner code setting associated with a tuner (s) coupled to a transmit antenna (s) of the wireless device. A respective transmit power limit is determined for the transmit antenna (s) for each transmit scenario and tuner code setting, in compliance with an RF exposure limit, based at least on the RF exposure characterizations. Indications of the transmit power limits are stored. In some example methods, a signal is transmitted from the transmit antenna (s) of a wireless device at a transmission power level based on the indications of the transmit power limits, in compliance with an RF exposure limit.

A method for adjusting a transmitting (TX) power ratio of a radio module includes: mapping a radiofrequency (RF) exposure limit to a TX power limit; interacting with at least one other radio module for adjusting the TX power ratio, to obtain an adjusted TX power ratio; and adjusting the TX power limit according to the adjusted TX power ratio, to generate an adjusted TX power limit of the radio module.

Certain aspects of the present disclosure provide techniques and apparatus for antenna-aware energy reservation for radio frequency (RF) exposure compliance. An example method of wireless communication includes obtaining information associated with a plurality of antenna ports. The method further includes determining one or more reserves based at least in part on the information. The method further includes transmitting a first signal via a first antenna port at a first transmit power determined based at least in part on the one or more reserves while maintaining at least a portion of the one or more reserves for a future transmission via a second antenna port.

The present disclosure relates to an electronic device that can include a wireless circuit with a radio having an antenna that transmits wireless data with a wireless base station according to a communication schedule and performs sensing using the antenna. The sensing can involve transmitting a sensing signal and receiving a reflected signal during a sensing period. A control circuit can adjust timing of the sensing period to align with a scheduled inactive time for the radio based on network configuration information and current sensing requirements of the device. In this way, the radio can perform radio frequency sensing for adjusting wireless transmissions to meet radio frequency exposure requirements without substantially disrupting wireless data communications.

Certain aspects of the present disclosure provide techniques and apparatus for multi-radio transmission scaling. A method that may be performed by a wireless device includes obtaining scaling information indicative of a relationship between a first radio frequency (RF) exposure associated with a plurality of first radios and a second RF exposure associated with a single second radio, and transmitting signals using a plurality of radios at one or more transmit powers determined based at least in part on a time-averaged RF exposure limit and the scaling information.

Certain aspects of the present disclosure provide techniques and apparatus for following radio frequency (RF) exposure limits via device positioning relative to a human body. An example method of wireless communication includes obtaining first information associated with one or more sensors. The method also includes obtaining second information associated with a mode of using the wireless device. The method further includes determining a location of the wireless device relative to the human body based at least in part on the first information and the second information. The method further includes transmitting a signal at a transmit power that follows an RF exposure limit based at least in part on the determined location of the wireless device.

Certain aspects of the present disclosure provide techniques and apparatus for operating a wireless communication device pursuant to radio frequency (RF) exposure compliance. An example method of wireless communication includes monitoring transmit power usage of a radio of the wireless device during a time interval in which the wireless device is in a reduced power mode. The transmit power usage over a first portion of the time interval is determined to satisfy one or more first criteria associated with lack of compliance with an RF exposure limit, based on the monitoring. Responsive to the determination, the radio is controlled during a second portion of the time interval in compliance with the RF exposure limit based at least in part on the transmit power usage over the first portion of the time interval.

Certain aspects of the present disclosure provide techniques and apparatus for operating a wireless communication device pursuant to radio frequency (RF) exposure compliance. A method that may be performed by a wireless device includes determining a base reserve and a dynamic reserve for each of a plurality of radios; and transmitting a signal with at least one of the radios at a transmit power determined based at least in part on one or more maximum time-averaged RF exposure limits associated with each of the radios and on the base reserve and the dynamic reserve for each of the radios.

Certain aspects of the present disclosure provide techniques for operating a wireless device pursuant to radio frequency (RF) exposure compliance. A method that may be performed by a wireless device includes switching sensing circuitry to a first mode in response to one or more first criteria being satisfied; switching the sensing circuitry to a second mode in response to one or more second criteria being satisfied; and transmitting a signal at a transmit power determined based at least in part on a radio frequency (RF) exposure limit, and if the sensing circuitry is operating in the second mode, on one or more measurements associated with the sensing circuitry.

Certain aspects of the present disclosure provide techniques and apparatus for antenna aware energy reservation for radio frequency (RF) exposure compliance. An example method of wireless communication includes obtaining information associated with a plurality of antenna ports. The method also includes determining one or more reserves based at least in part on the information. The method also includes transmitting a first signal via the first antenna port at a first transmit power determined based at least in part on the one or more reserves while maintaining at least a portion of the one or more reserves for future transmission via the second antenna port.

Techniques and apparatus for beam selection in compliance with radio frequency (RF) exposure limits. A method that may be performed by a wireless device includes receiving, from another wireless device, a plurality of signals via a plurality of beams; measuring a received signal power for each of the beams, based on the received plurality of signals; determining a transmit power limit for each of the beams based at least in part on an RF exposure limit; determining an estimation of a signal quality at the other wireless device for each of the beams based at least in part the received signal powers and the transmit power limits; selecting one of the beams based on the estimations of the signal qualities for the beams; and transmitting a signal via the selected beam.

The present invention provides an apparatus and method for determining transmit power based on a pattern and / or future conditions for transmission while maintaining radio frequency (RF) exposure compliance. [Solution] The method involves acquiring a pattern associated with one or more first transmissions, determining a transmission power for one or more second transmissions based at least partially on the pattern and radio frequency (RF) exposure limits, determining a first transmission power, determining a second transmission power based at least partially on the average transmission power over a certain time interval, selecting a third transmission power as the minimum of the first and second transmission powers, determining a transmission power for one or more second transmissions such that the transmission power is less than or equal to the third transmission power, and transmitting the one or more second transmissions with the determined transmission powers.

Certain aspects of the present disclosure provide techniques and apparatus for priority aware transmit power control following radio frequency (RF) exposure limits. An example method of wireless communication includes obtaining a transmit power budget for a time interval. The method further includes obtaining at least a first packet having a first priority and a second packet having a second priority for transmission in the time interval, the second priority being lower than the first priority. The method further includes determining a first transmit power for a first signal representing at least the first packet based at least in part on the transmit power budget, the first priority, and a time elapsed in the time interval. The method further includes transmitting the first signal representing at least the first packet at the determined first transmission power.