126 results about "Rf exposure" patented technology

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may allocate a first amount of power to one or more radios for a time window based on radio frequency (RF) exposure information and one or more other criteria. The UE may allocate a second amount of power to a selected channel or communication utilized by at least one radio of the one or more radios for one or more time frames within the time window based on the first amount of power allocated to the at least one radio for the time window. The UE may transmit the selected channel or communication based on the first amount of power or the second amount of power. Numerous other aspects are described.

A method for performing mapping between one or more radio modules and one or more radiofrequency (RF) groups includes: separating the one or more radio modules into the one or more RF groups according to one or more messages, wherein the one or more messages comprise a previous TX power ratio, a TX power ratio margin, one or more weighting information, one or more TX performance indices, one or more receiving (RX) performance indices, one or more configurations, or one or more usage scenarios; accumulating RF exposure of the one or more radio modules to at least one RF group among the one or more RF groups; and determining at least one transmitting (TX) power limit corresponding to the at least one RF group according to accumulated RF exposure of the at least one RF group.

A method for managing a maximum permissible exposure (MPE) limit that corresponds to a time window is provided. The method includes estimating, based on radar detection information and transmission history information, a previous radio frequency exposure (RFE) for a target that occurred during a previous time period of the time window. The method includes predicting a future RFE on the target to occur during a future time period of the time window such that a sum of the estimated previous RFE and the predicted future RFE does not exceed the MPE limit for the time window. The method includes determining, based on the predicted future RFE, a transmission power budget for a transceiver of an electronic device for transmission during the future time period.

A method for improving transmission power management with compliance to regulations of radiofrequency exposure, which may comprise: at a current time, estimating whether a window average power, which may reflect average power transmitted using a radio technology during a moving time window, will exceed a power limit after the current time; if true, proceeding to at least one of a first handling subroutine and a second handling subroutine to set a power cap, and causing power transmitted to be capped by the power cap after the current time. The first handling subroutine may comprise: scheduling to set the power cap lower at a scheduled time. Estimating whether the window average power will exceed the power limit may involve discarding one of a plurality of power records. The second handling subroutine may comprise: setting the power cap not higher than the discarded one of the plurality of power records.

A method for dynamically allocating radio frequency (RF) exposure across multiple RF groups including a first RF group and a second RF group includes: estimating RF exposure of the first RF group according to at least one message of the first RF group, in order to generate estimated RF exposure; calculating RF exposure of the second RF group according to at least one message of the second RF group, the estimated RF exposure, and one or more equations, in order to generate calculated RF exposure, wherein the one or more equations are associated with a predetermined regulation; and determining a TX power limit corresponding to the first RF group and a TX power limit corresponding to the second RF group according to the estimated RF exposure and the calculated RF exposure, respectively.

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.

Certain aspects of the present disclosure provide techniques and apparatus for determining a transmit power based on a pattern and / or future conditions for a transmission while maintaining radio frequency (RF) exposure compliance. An example method generally includes obtaining a pattern associated with one or more first transmissions, determining a transmit power for one or more second transmissions based at least in part on the pattern and an RF exposure limit, and transmitting the one or more second transmissions at the determined transmit power.

Provided is a method for improving transmission power management according to RF exposure regulations, including: at the current time, estimating whether the window average power (which can reflect the average power transmitted using a radio technology during a moving time window) will exceed a power limit after the current time; if so, performing at least one of a first processing sub - process and a second processing sub - process to set a radio power upper limit, and limiting the power to the power upper limit after the current time. The first processing sub - process includes: scheduling to set the power upper limit lower at a predetermined time. Estimating whether the window average power will exceed the power limit involves discarding a plurality of power records. The second processing sub - process includes: setting the power upper limit to be no higher than one of the discarded power records among the plurality of power records.

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.

An electronic device may include a first set of radios subject to a specific absorption rate (SAR) limit and a second set of radios subject to a maximum permissible exposure (MPE) limit over an averaging period. Control circuitry may dynamically adjust radio-frequency (RF) exposure metric budgets provided to the radios over the averaging period, based on feedback reports from the radios identifying the amount of SAR and MPE consumed by the radios during different subperiods of the averaging period. The control circuitry may distribute and adjust SAR budgets and MPE budgets across the radios based on the feedback reports, distribution policies, radio statuses, transmit activity factors, and / or usage ratios associated with the radios. This may provide efficient utilization of the total available SAR and MPE budget, thereby leading to increased uplink coverage and throughput relative to scenarios where the SAR and MPE budgets remain static.

Certain aspects of the present disclosure provide techniques for exception-robust time-averaged radio frequency (RF) exposure compliance continuity. A method that may be performed by a user equipment (UE) generally includes transmitting a first signal at a first transmission power based on time-averaged RF exposure measurements over a time window and storing RF exposure information associated with the time window. The method may also include detecting that an exception event associated with the UE occurred and transmitting a second signal at a second transmission power based at least in part on the stored RF exposure information in response to the detection of the event.

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.

Techniques and apparatus for enhancing transmission power limits and joint input power limits for transmissions from multiple antenna ports in compliance with radio frequency (RF) exposure limits are described. A method that may be performed by a wireless communication device includes receiving, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas. The uplink grant indicates a transmission mode for the uplink transmission. A respective transmission power limit is determined for each antenna in the set of antennas, based at least in part on the transmission mode and in compliance with an RF exposure limit. The uplink transmission is sent via the set of antennas according to the respective transmission power limits.

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.

The present disclosure relates to systems and methods 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 dynamically adjustable maximum UL duty cycle. When the UE identifies that a user is approaching 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 recommended maximum UL duty cycle that will allow the UE to meet limits on RFE. The base station may limit UL authorization to the UE so that the UE performs subsequent communications using the recommended maximum UL duty cycle or a different maximum UL duty cycle. Coordinating the adjustment of the UL duty cycle in this manner may allow the UE to meet limits on RFE without requiring the UE to perform a maximum transmission power level reduction.

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.

Certain aspects of the present disclosure provide techniques for exception-robust time-averaged radio frequency (RF) exposure compliance continuity. A method that may be performed by a user equipment (UE) generally includes transmitting a first signal at a first transmission power based on time-averaged RF exposure measurements over a time window and storing RF exposure information associated with the time window. The method may also include detecting that an exception event associated with the UE occurred and transmitting a second signal at a second transmission power based at least in part on the stored RF exposure information in response to the detection of the event.

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 for enhancing transmission power limits and joint input power limits for transmissions from multiple antenna ports in compliance with radio frequency (RF) exposure limits are described. A method that may be performed by a wireless communication device includes receiving, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas. The uplink grant indicates a transmission mode for the uplink transmission. A respective transmission power limit is determined for each antenna in the set of antennas, based at least in part on the transmission mode and in compliance with an RF exposure limit. The uplink transmission is sent via the set of antennas according to the respective transmission power limits.

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.