50 results about "Rf exposure" patented technology

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.

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 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.

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 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.

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.

Techniques and apparatus are described for generating a compressed radio frequency (RF) exposure map and using such compressed RF exposure map to determine a transmit power that meets RF exposure compliance limits. An exemplary method generally includes obtaining a first RF exposure map associated with at least one antenna of a wireless device and converting the first RF exposure map to a second RF exposure map. The second RF exposure map is compressed relative to the first RF exposure map. Another exemplary method includes accessing an RF exposure map associated with at least one antenna of the wireless device. The RF exposure map includes a representation of maximum RF exposure for a region of the RF exposure map. The method also includes transmitting a signal from the antenna at a transmit power that complies with the RF exposure limits, determined based on the RF exposure map.

A first transmission power level based on a radio frequency exposure limit and a second transmission power level based on the first transmission power level and a probability of detection of a body by a body proximity sensor are determined, where it is ensured that an average usage of the first and second transmission power levels over time does not exceed the transmission power limit, determined based on radio frequency exposure limits. A transmission power gain is determined based on a difference between the first and second transmission power level based on the probability of detection, and a false alarm rate of the body by the body proximity sensor. The transmission power gain may be used as a performance indicator to select from multiple first and second transmission power gains. First and second transmission power gains corresponding to the selected transmission power gain may be stored and applied during transmission.

The present disclosure relates to radio frequency exposure beam management and selection in a communication system. An electronic device can include a set of antenna panels (APs) that transmit and receive signals within a set of signal beams. A proximity sensor, such as a radar sensor, can collect sensor data indicative of a location of an external object. The device can select an AP and a beam that maximizes wireless performance when communicating with a base station while also complying with radio frequency exposure (RFE) requirements. The device can select the AP and the beam based on the sensor data, per-panel and per-beam predicted RFE values, antenna port RFE characteristics, per-panel and per-beam transmit power limits, per-beam transmit power backoff, RFE lookup tables, regulatory RFE limits, and antenna performance metrics. The device can transmit an RFE report to the base station that identifies some or all of this information for use in updating scheduling of the device.

Certain aspects of the present disclosure provide techniques and apparatus for filter-based time-averaged radio frequency (RF) exposure assessment. An example method of wireless communication includes determining, using a filter, an effective time average transmit power associated with one or more past transmissions. The method further includes transmitting the signal in the time interval at a transmit power determined based at least in part on the effective time-averaged transmit power that conforms to the RF exposure limit.

The invention discloses a biological electromagnetic protection method and system based on electromagnetic field space distribution regulation and control, and belongs to the technical field of radio frequency exposure control and electromagnetic compatibility. The method comprises the following steps: acquiring parameters of a radiation source, a target biological area and an ITO metamaterial wave absorber, and setting the layout position of the wave absorber as to-be-optimized parameters; a three-dimensional coupling electromagnetic field distribution model is established, and an optimization problem including wave absorber dissipation and source side performance constraint is established with the purposes of increasing the size of a continuous low-field area and reducing the local specific absorption rate peak value; solving to obtain open layout parameters and carrying out open layout of the unclosed shielding body; and finally, closed-loop verification is carried out through electromagnetic simulation and phantom measurement registration, and a low-field target area is determined to be formed. According to the invention, protection can be realized without depending on a closed continuous conductive shielding body.

The present disclosure relates to systems and methods for configuring a transmit power level based on body proximity. A first transmit power level is determined based on a radio frequency exposure limit value, and a second transmit power level is determined based on the first transmit power level and a detection probability of a body by a body proximity sensor, wherein an average usage of the first transmit power level and the second transmit power level over time is ensured not to exceed a transmit power limit value determined based on the radio frequency exposure limit value. A transmit power gain is determined based on a difference between the first transmit power level and the second transmit power level, based on the detection probability of the body by the body proximity sensor and a false alarm rate. The transmit power gain can be used as a performance indicator to select from a plurality of first transmit power gains and second transmit power gains. The first transmit power gain and the second transmit power gain corresponding to the selected transmit power gain can be stored and applied during transmission.

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 reserve energy allocation among radios of a wireless device based on spatial information of radio frequency (RF) exposure contributions among antennas of the wireless device are described. An example technique includes determining RF exposure contribution information associated with a plurality of antennas for radio(s) of the wireless device. The RF exposure contribution information includes, for each antenna, a respective indication of RF exposure contribution from the antenna on RF exposure contributor(s). A reserve level for each of the radio(s) is determined, based at least in part on the RF exposure contribution information. First signal(s) are transmitted using at least one of the radio(s) at a first transmit power determined based at least in part on an RF exposure limit associated with each of the radio(s) and the reserve level for each of the radio(s).

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 set of antenna panels (APs) that transmit and receive signals within a set of signal beams. A proximity sensor such as a radar sensor may gather sensor data indicative of the position an external object. The device may select an AP and a beam that maximize wireless performance in communicating with a base station while also complying with the radio-frequency exposure (RFE). The device may select the AP and the beam based on the sensor data, per-panel and per-beam projected RFE values, antenna port RFE characteristics, per-panel and per-beam transmit power limits, per-beam transmit power backoffs, an RFE lookup table, regulatory RFE limits, and antenna performance metrics. The device may transmit an RFE report to the base station that identifies some or all of this information for use in updating scheduling for the device.

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

This disclosure relates to radio frequency exposure beam management and selection in a communication system. An electronic device may include a set of antenna panels (APs) that transmit and receive signals within a set of signal beams. A proximity sensor, such as a radar sensor, can collect sensor data indicating the location of an external object. The device can select APs and beams that maximize wireless performance while complying with radio frequency exposure (RFE) requirements when communicating with a base station. The device can select the APs and beams based on the sensor data, predicted RFE values ​​per panel and per beam, antenna port RFE characteristics, transmit power limits per panel and per beam, transmit power backoff per beam, RFE lookup tables, regulatory RFE limits, and antenna performance metrics. The device can transmit an RFE report to the base station that identifies some or all of this information used to update the device's scheduling.