62 results about "Specific absorption rate" patented technology

Methods, systems, and devices for wireless communication are described. The described techniques relate to various scheduling procedures for wireless communications. In some implementations, a user equipment (UE) may estimate transmit power used within a duration for tracking specific absorption rate (SAR) and may indicate the estimated transmit power to a network. The network may schedule UEs based on the estimated transmit power. In some implementations, a UE may receive a control message including an uplink grant and an indication that monitoring of a physical downlink control channel (PDCCH) is skipped during a discontinuous reception cycle (DRX) on duration. The UE may send a message to accept, in part accept, or reject skipping of PDCCH monitoring. In some implementations, a UE may be configured for multi-user multiple-input multiple-output (MU-MIMO) communication with other UEs. A UE may receive a message indicating parameters of other UEs.

The dynamic scheduling request framework reduces the need to reduce peak transmit power when a User Equipment (UE) approaches Specific Absorption Rate (SAR) limits. This preserves the ability of the UE to overcome interference, for example when near the cell edge, reduces dropouts, and maintains the advantages of High Power UEs (HP UEs), such as Power Class 2 (PC2) devices. If a combination of the current buffer status report (BSR), current peak transmit power, and historical average transmit power—indicating more data to transmit—suggests a risk that the UE is violating SAR limits, logic within the UE and / or network reduces the number of resource blocks (RBs) allocated to the UE. Average transmit power is reduced by lowering the transmitter's duty cycle while maintaining the current peak transmit power. Once the risk of SAR violation is mitigated, RB allocation returns to normal.

Disclosed are a transmission power control method and an electronic device for performing the same. The transmission power control method according to various embodiments may comprise: determining whether the magnitude of a reference signal received from a first base station for transmitting and receiving a first signal is greater than or equal to a set magnitude; determining a ratio of a specific absorption rate of the first signal according to a ratio set in the total specific absorption rate margin; and transmitting the first signal on the basis of the ratio of the specific absorption rate of the first signal.

The invention relates to the technical field of radio frequency hyperthermia control, and particularly discloses a radio frequency hyperthermia intelligent control method based on micro-disturbance frequency sweeping and multi-mode perception, which comprises the following steps: applying a micro-disturbance radio frequency scanning signal to a treatment target area, and processing feedback data to dynamically reconstruct a real-time dielectric property map of a tissue; fusing the atlas with real-time temperature distribution data obtained by magnetic resonance, calculating instantaneous specific absorption rate distribution and predicting a thermal field evolution trend; constructing an optimization cost function based on the information, and generating a dynamic adjustment instruction for radio frequency power, frequency, phase and multi-antenna array focus position after solving; evaluating the control efficiency through a closed-loop verification mechanism and adaptively optimizing system parameters; by sensing the dynamic change of the dielectric property of the tissue in real time, feed-forward-feedback composite intelligent control over the radio frequency thermal therapy process is achieved, the problem of thermal field mismatch caused by the change of the tissue property in a traditional method is effectively solved, and the accuracy and safety of treatment are improved.

Disclosed herein are related to a device. The device can include a wireless communication interface and one or more processors. The wireless communication interface can transmit data to a remote device. The one or more processors can determine a particular control state from a plurality of control states according to sensor data received from a plurality of sensors. The control states can be for meeting at least one of a specific absorption rate (SAR) or power density (PD) for operation of the wireless communication interface. The one or more processors can control operation of the at least one wireless communication interface according to the particular control state.

The application discloses a kind of FDTD nonlinear conformal filter methods of inhibiting step error of specific absorption rate, comprising: obtaining grid model;Determine the eighth cube in each grid as material domain;The 3x3x3 three-dimensional grid matrix of using preset is scanned to the grid, determine the step grid on the two sides of human tissue / air interface;Optimize the conductivity and dielectric constant of the material domain of step grid, after all step grid is completed optimization, the first electric field component of all grid is calculated;The first electric field component of each material domain vertex of same tissue is linearly interpolated \ extrapolated, obtain the second electric field component of the center of material domain, and calculate local SAR;After obtaining the local SAR of all material domains of same tissue, the tissue average SAR of this tissue is calculated, after obtaining the local SAR of all material domains of different tissues, the 10-g SAR containing different tissues is calculated.The application can effectively inhibit the step error of the local SAR of the complex structure surface of human body, improve the accuracy of SAR statistical result.

A user equipment (UE) in a mobile cellular network implements one or more techniques to perform cross-technology specific absorption rate (SAR) budget allocation. The UE computes an individual SAR budget for each radio access technology (RAT) module of a plurality of RAT modules at the UE based on operational context data associated with the UE. The UE sends each individual SAR budget to a corresponding RAT module of the plurality of RAT modules. The UE then adjusts, at one or more RAT modules of the plurality of RAT modules, transmission parameters based on the corresponding individual SAR budget.

The application discloses an antenna specific absorption rate detection method, device and electronic equipment, and belongs to the field of electronic equipment. The antenna specific absorption rate detection method comprises the following steps: determining L detection channels, and M inductive antennas and detection parameters corresponding to each detection channel according to the working state of N inductive antennas; indicating the detection parameters corresponding to each detection channel to the specific absorption rate sensor, and indicating the connection circuit unit to connect the switch circuit between the M inductive antennas; and performing specific absorption rate detection on the L detection channels by the specific absorption rate sensor according to the detection parameters corresponding to each detection channel; wherein, N is a positive integer greater than 1, M is a positive integer less than or equal to N, and L is a positive integer.

The invention relates to a transmitting coil. The transmitting coil comprises two end rings and a plurality of coil crosspieces, wherein the plurality of coil crosspieces are arranged between the two end rings; the structure of each coil crosspiece comprises a first dielectric layer, a plurality of first metal layers and a plurality of second metal layers, the plurality of first metal layers are distributed and attached to one side of the first dielectric layer, and the plurality of second metal layers are distributed and attached to the other side of the first dielectric layer; and each first metal layer and the second metal layer at the corresponding position of the other side of the first dielectric layer form a capacitor. By using the transmitting coil provided by the invention, the specific absorption rate (SAR) in high-field magnetic resonance scanning can be reduced.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may select a first transmit power level associated with a first expected radiation power from antenna(s) of the UE. Selection of the first transmit power level is based at least in part on the first expected radiation power complying with a specific absorption rate (SAR) threshold. The UE may increase the first transmit power level to a second transmit power level associated with a second expected radiation power from the antenna(s) of the UE. The increase to the second transmit power level is based on application of an antenna efficiency metric associated with the antenna(s) of the UE to the second expected radiation power to determine a reduced expected radiation power. The UE may perform transmission(s) from the antenna(s) at the second transmit power level based on the reduced expected radiation power satisfying the SAR threshold.

Embodiments of the present application provide a magnetic resonance scanning and imaging method, and a magnetic resonance imaging system. The method includes: determining a pulse to be adjusted in a scan sequence, the pulse to be adjusted including a first radio-frequency pulse and a first gradient pulse applied along with the first radio-frequency pulse; determining an adjustment factor based on the first gradient pulse and a minimum repetition time related to a specific absorption rate of radio-frequency energy; adjusting the scan sequence based on the adjustment factor; and, using the adjusted scan sequence, performing a diagnostic scan on a site to be examined, to obtain a magnetic resonance image.

The invention discloses a transmitting power adjusting method and device and electronic equipment, and belongs to the technical field of communication. The method comprises the following steps: acquiring sensor data of at least one sensor in the electronic equipment and first transmitting power of an antenna of the electronic equipment; obtaining a predicted specific absorption rate based on the sensor data and the first transmitting power; determining a target power adjustment strategy based on the predicted specific absorption rate; and adjusting the transmitting power of an antenna of the electronic equipment based on the target power adjustment strategy.

Embodiments of the present application relate to the technical field of antennas, and provide an antenna structure and an electronic device. The antenna structure comprises a first radiator, a second radiator, and a tuning component. The first radiator is configured to be electrically connected to a feed source. A first end of the second radiator is grounded. One end of the tuning component is connected to a second end of the second radiator, and the other end of the tuning component is grounded. The tuning component comprises an inductor. When the antenna structure is in a first operating mode: one end of the inductor is connected to the second end, the other end of the inductor is grounded; an inductance value of the inductor is greater than 0 and less than or equal to 10 nh; the first radiator is coupled to the second radiator; a difference between the frequency of a resonance generated by the first radiator and the frequency of a resonance generated by the second radiator is greater than or equal to 100 MHz and less than or equal to 400 MHz; and a current direction on the first radiator is the same as that of the second radiator. In this way, the strength of signals radiated by antenna structures to the external environment is increased while satisfying specific absorption rate requirements.

According to an embodiment, an electronic device may comprise: a communication circuit; at least one processor including processing circuitry; and a memory for storing instructions, wherein the instructions, when executed individually or collectively by the at least one processor, cause the electronic device to: establish a connection with an external device through the communication circuit (190); in a first transmission mode, during a first subperiod of a first time period configured on the basis of a time averaged specific absorption rate feature operation, transmit a signal to the external device on the basis of configuring a first maximum transmission power higher than a maximum transmission power limit value configured on the basis of the time averaged specific absorption rate feature operation; during a second subperiod of the first time period, transmit a signal to the external device on the basis of configuring a second maximum transmission power lower than the maximum transmission power limit value; switch from the first transmission mode to a second transmission mode on the basis of identifying occurrence of a switching event on the basis of information associated with at least one of a channel state, a data size, and a specific absorption rate budget during the signal transmission to the external device; in the second transmission mode, during a third subperiod of a second time period configured on the basis of the specific absorption rate feature operation, transmit a signal to the external device on the basis of configuring a third maximum transmission power equal to or lower than the first maximum transmission power; and during a fourth subperiod of the second time period, transmit a signal to the external device on the basis of configuring a fourth maximum transmission power different from the second maximum transmission power.

A metamaterial (MTM) slab for a Magnetic Resonance Imaging (MRI) system passively interacts with a field generated by a transmit device to improve homogeneity of the field, specific absorption rate, and / or strength of the field. The MTM slab may also be connected to RF receive circuitry at one or more ports to act as a receiver for the MRI. The MTM slab may comprise a first layer generally defining a surface and a second layer offset from the surface generally defined by the first layer, the first layer and the second layer interacting to form a 2D transmission line supporting radio frequency (RF) current along the surface in a first direction and in a second direction transverse to the first direction, the first layer and the second layer being connected via linking capacitors.

The invention discloses a broadband electromagnetic radiation specific absorption rate SAR probe and a measurement method thereof, and the probe comprises a nonlinear electric field detector at the front end of the probe and used for inducing an incident radio frequency electric field to generate radio frequency oscillation voltage; the nonlinear electric field detector comprises a voltage stabilizing diode; the low-pass filter is connected with the nonlinear electric field detector and is used for filtering high-frequency signals in the radio-frequency oscillation voltage; the broadband high-resistance transmission line is respectively connected with the low-pass filter and the broadband signal receiver and is used for transmitting the filtered radio frequency oscillation voltage to the broadband signal receiver; and the broadband signal receiver at the tail end of the probe is used for receiving the filtered radio frequency oscillation voltage and converting the filtered radio frequency oscillation voltage into an electromagnetic radiation specific absorption rate SAR. By adopting a novel probe circuit design scheme, the problem that visual and effective dose evaluation equipment is lacked in current human body electromagnetic exposure dose evaluation is solved.

The application discloses an exponential cell temperature regulation method and system for large-dose electromagnetic irradiation cell non-thermal effect experiment, relates to the technical field of bioelectromagnetics experiment, and solves the problem that a complex air flow temperature change curve required by traditional adaptive temperature control is difficult to realize by using an existing temperature control device. The method comprises the following steps: electromagnetic modeling simulation; temperature modeling simulation; calculation of the upper limit of average specific absorption rate (SAR); calculation of the redundant range of the air flow temperature change curve of exponential temperature control; and realization of exponential temperature control. The application is applied to the large-dose electromagnetic irradiation cell non-thermal effect experiment, uses the air flow temperature change curve of exponential temperature control to replace the air flow temperature change curve of adaptive temperature control, reduces the complexity of the curve, uses the reference temperature utilization coefficient and the temperature change time constant to obtain a certain redundant range of the air flow temperature change curve, and significantly improves the feasibility of temperature control.

The invention relates to the technical field of electromagnetic measurement, and discloses a specific absorption rate evaluation method and device based on a dielectric dummy model in an automobile. The dielectric dummy whole body model comprises a head, a trunk and lower limbs which are internally communicated; the whole body model is filled with tissue fluid; interstitial fluid altimeters are respectively arranged at the navel position and the chest position of the model; measuring assemblies are arranged at the head, the chest and the crotch of the model respectively; the measuring assembly comprises a tapping auxiliary rod arranged on the model, a cylindrical probe detection rod is arranged in the tapping auxiliary rod, and a gasket is arranged between the probe detection rod and the tapping auxiliary rod. Through in-vivo measurement based on the whole-body dielectric dummy, an innovative dynamic sealing structure and intelligent data correction, the accuracy, reliability and scene applicability of automobile electromagnetic safety evaluation in a real driving state are remarkably improved.

An electronic device according to an example embodiment includes: at least one wireless communication module comprising communication circuitry configured to transmit and receive a wireless signal, at least one processor operatively connected to the at least one wireless communication module, and a memory electrically connected to the processor and configured to store instructions executable by the processor, wherein, in response to the instructions being executed by the processor, the processor may be configured to: determine whether there is a target wake time (TWT) parameter for a TWT service, determine a time-averaged specific absorption rate (TAS) backoff regulation value for a time window based on the TWT parameter, and control the at least one wireless communication module to perform communication during the time window based on the TAS backoff regulation value and the TWT parameter.

The present application relates to the electromagnetic protection field, and relates to a kind of human body electromagnetic protection efficiency evaluation method and system based on full-wave electromagnetic simulation.It establishes the high-precision three-dimensional human body model containing multiple internal organs of human body, gives the relevant electromagnetic parameters of human body and organ tissue, establishes the protective clothing model to be measured outside human body model and gives the electromagnetic parameters of its material, establishes the radiation source model to simulate the radiation situation received in daily life and sets the boundary condition of radiation to simulate the test situation of microwave darkroom, can obtain the electromagnetic field and specific absorption rate of human body surface and internal organ, and the size and distribution situation can be directly observed that the protection effect of electromagnetic protective clothing to human body and the shielding efficiency of protective clothing is calculated.The present application overcomes the defects of high cost, long cycle and difficult to obtain comprehensive data of traditional experimental method, realizes the rapid, accurate and intuitive quantitative evaluation and optimization design of the shielding efficiency of electromagnetic protective clothing.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a traffic type of an uplink communication. The UE may identify one or more specific absorption rate (SAR) or maximum permissible exposure (MPE) parameters for a time window. The UE may identify, from among a plurality of candidate numbers of transmit ports, based at least in part on the traffic type and the one or more SAR or MPE parameters, a number of transmit ports for transmission of the uplink communication. The UE may transmit the uplink communication using the number of transmit ports. Numerous other aspects are described.

A method comprising: retrieving a predefined power threshold; determining a transmission power of a transmitting antenna, wherein the transmitting antenna is actively transmitting a signal; retrieving a predefined transmission time interval; determining that the transmission power exceeds the predefined power threshold; determining a duration of transmitting the signal; comparing the duration with the predefined transmission time interval; and switching transmitting the signal from the transmitting antenna to a further antenna when the duration equals the predefined transmission time interval.

The application provides a magnetic resonance radio frequency transmitting system and a magnetic resonance system radio frequency safety monitoring method, wherein the forward power and / or the reverse power of each coil loop of a transmitting coil is measured through a directional coupler, the coupling current of each coil loop of the transmitting coil is measured through a coupling probe, and the power loss of the transmitting coil is determined according to the forward power, the reverse power and the coupling current of each coil loop, so that the specific absorption rate corresponding to a scanning sequence is determined, and the accuracy of radio frequency safety monitoring of the magnetic resonance radio frequency transmitting system is improved. In addition, the application solves the problem that the power loss of the transmitting coil in the magnetic resonance radio frequency transmitting system is difficult to measure due to the change of the transmitting amplitude and phase of each coil loop, and the real patient absorption power is more accurately obtained, so that the radio frequency safety of the patient in the super-high field multi-channel transmitting magnetic resonance system is ensured.

The application discloses an electronic device, comprising: an antenna module, a filter unit and a specific absorption rate (SAR) processing unit, the antenna module comprising a first antenna radiator and a second antenna radiator; the first antenna radiator is connected in series with the second antenna radiator through the filter unit; the SAR processing unit is connected with the first antenna radiator, and the filter unit supports the passage of a SAR signal; or, the SAR processing unit is connected with the first antenna radiator and the second antenna radiator respectively, and the filter unit blocks the passage of the SAR signal.

An electronic device may comprise: a first antenna, a second antenna disposed at a location different from a location in which the first antenna is disposed, and a processor. The processor may, on the basis of the magnitude of the maximum average power of a signal output through the first antenna to satisfy a time average specific absorption rate (SAR) configured in the electronic device and the maximum transmit power limit of a signal output through at least one of the first antenna and the second antenna configured by a cellular network, select an antenna to output the signal, from among the first antenna and the second antenna. The processor may select an antenna to output a signal on the basis of a difference between the magnitude of the maximum average power of a signal output through the first antenna and the magnitude of the maximum average power of a signal output through the second antenna.

A dynamic scheduling request framework reduces the need of a user equipment (UE) to reduce peak transmit power when approaching the specific absorption rate (SAR) limit. This preserves the ability of UEs to overcome interference (e.g., when near a cell edge), reducing dropped calls, and retains the advantages of high power UEs (HP UEs), such as power class 2 (PC2) devices. When the combination of the current buffer status report (BSR), indicating more data to transmit, with the current peak transmit power and historical average transmitted power indicates a risk that the UE will violate the SAR limit, logic in the UE and / or the network reduces the number of resource blocks (RBs) allocated to the UE. By dropping the duty cycle of the transmitter, even while retaining the current peak transmit power, the average transmitted power will drop. Upon the SAR violation risk abating, the RB allocation returns to normal.

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.

Methods, systems, and devices for wireless communications are described. An access point (AP) and a station (STA) may communicate frames in accordance with a specific absorption rate (SAR) limit. An AP or STA may suspend or modify an SAR limit to support communicating frames having relatively higher transmission powers. For example, the AP or STA may modify an SAR limit for a time interval (for example, a time-averaged SAR limit) such that the AP or STA may increase a transmission power of a data frame. In some examples, the AP or STA may modify a duty cycle associated with the data frame based on modifying the SAR limit for the time interval. Additionally or alternatively, the AP or STA may suspend an SAR limit (for example, a transmission power threshold associated with the SAR limit) such that the AP or STA may increase a transmission power of a control frame.

The present disclosure relates to an earphone. The earphone includes an antenna including a radiator arranged in a ring shape and a feed point disposed on the radiator, the feed point being configured to receive a feed current, wherein the feed current forms a first transmission current and a second transmission current that are transmitted in opposite directions along a circumferential direction of the radiator on two sides of the feed point, and the first transmission current and the second transmission current converge in the radiator. In this way, a SAR value can be reduced, and an impact of electromagnetic wave in the earphone on a human body can be reduced.