Transmission energy distribution between different radios

Abstract

Certain aspects of the present disclosure provide techniques for transmit energy distribution. A method executable by a wireless device includes obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio communicating via a radio access technology of a first type and a second radio, and the second radio communicating via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the radios based at least in part on the reservation information and an activity state associated with each of the radios; and transmitting one or more signals at a transmit power using at least one of the radios, the transmit power determined based at least in part on a radio frequency exposure limit associated with each of the radios and the reservation for each of the radios.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. patent application serial number 18 / 325,773 filed on May 30, 2023, which claims the benefit of and priority to U.S. Provisional Application No. 63 / 365,697 filed on June 1, 2022 and U.S. Provisional Application No. 63 / 369,329 filed on July 25, 2022, which applications are hereby expressly incorporated herein by reference in their entirety. Background Art Technical Field

[0003] Aspects of the present disclosure relate to wireless communications and, more particularly, to radio frequency (RF) exposure compliance.

[0004] Related technologies

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, broadcasting, etc. Modern wireless devices, such as cellular phones, are often required to meet radio frequency (RF) exposure limits set by certain government and international standards and regulations. To ensure compliance with the standards, such devices may undergo an extensive certification process before being shipped to the market. In order to ensure that wireless devices comply with RF exposure limits, technologies have been developed that enable wireless devices to assess RF exposure from the wireless device and adjust the transmit power of the wireless device accordingly for compliance. Summary of the invention

[0006] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable characteristics. Without limiting the scope of the present disclosure as expressed in the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description of the Invention," one will understand how the features of the present disclosure provide advantages including improved wireless communication performance and / or efficient energy allocation between radios.

[0007] Certain aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication by a wireless device. The method generally includes obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology. The method also includes: determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and using at least one of the radios to transmit one or more signals at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the radios and the reservation for each of the radios.

[0008] Certain aspects of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus generally includes a memory and a processor coupled to the memory. The processor is configured to: obtain reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determine a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and use at least one of the radios to transmit one or more signals at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the radios and the reservation for each of the radios.

[0009] Certain aspects of the subject matter described in the present disclosure may be implemented in an apparatus for wireless communication. The apparatus generally includes: means for obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; means for determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and means for transmitting one or more signals using at least one of the radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the radios and the reservation for each of the radios.

[0010] Certain aspects of the subject matter described in the present disclosure may be implemented in a computer-readable medium. The computer-readable medium has instructions stored thereon that, when executed by an apparatus, cause the apparatus to perform operations including: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and transmitting one or more signals using at least one of the radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the radios and the reservation for each of the radios.

[0011] To achieve the aforementioned and related purposes, one or more aspects include the features described in full below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain exemplary features of the one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order that the above-mentioned features of the present disclosure can be understood in detail, a more specific description briefly summarized above can be obtained by referring to some aspects illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit to other equally effective aspects.

[0013] Figure 1 is a block diagram conceptually illustrating an example wireless communication network in accordance with certain aspects of the present disclosure.

[0014] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0015] Figure 3 is a block diagram of an example radio frequency (RF) transceiver in accordance with certain aspects of the present disclosure.

[0016] Figure 4A , Figure 4B and Figure 4C is a graph illustrating an example of transmit power over time that complies with time-averaged RF exposure limits in accordance with certain aspects of the present disclosure.

[0017] Figure 5 is a block diagram illustrating an example grouping of multiple antennas for a wireless communication device.

[0018] Figure 6 is a table illustrating example reservations for multiple radios of an antenna group for different transmission scenarios.

[0019] Figure 7 is a flow diagram illustrating example operations for wireless communications by a wireless device in accordance with certain aspects of the present disclosure.

[0020] Figure 8 Illustrated is a communications device (eg, UE) that may include various components configured to perform operations for the techniques disclosed herein in accordance with certain aspects of the present disclosure.

[0021] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0022] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for transmit energy allocation between different radios.A radio may be used for several access technologies (RATs).

[0023] In some cases, a wireless communication device may evaluate radio frequency (RF) exposure compliance for two radios of a particular RAT (e.g., Long Term Evolution (LTE) or Fifth Generation New Radio (5G NR)) or a class of RATs, such as wireless wide area network (WWAN) access technologies (e.g., LTE and 5G NR). The wireless device may be configured with a minimum reservation associated with two radios for WWAN communication and a ratio for splitting the minimum reservation between the radios when the two radios are actively transmitting simultaneously. When the two radios are transmitting simultaneously, the wireless device may divide the minimum reservation between the radios based on the configured ratio. When only one radio is transmitting, the wireless device may allocate at least the entire minimum reservation to the corresponding radio. The wireless device may also support other types of RATs, such as IEEE 802.11, Bluetooth, satellite communications, device-to-device (e.g., sidelink) communications, vehicle-to-everything (V2X) communications, and the like.

[0024] Various aspects of the present disclosure provide apparatus and methods for allocating transmit energy for three or more radios and / or between radios communicating via different RATs. For example, a wireless device may allocate a minimum reservation between radios in an antenna group. The radios in an antenna group may communicate via WWAN (e.g., LTE and 5G NR) and wireless local area network (WLAN) access technologies (e.g., IEEE 802.11). The wireless device may allocate a minimum reservation between radios that will be actively transmitting simultaneously. In some cases, a wireless device may be configured with a reservation dedicated to a specific RAT (such as Bluetooth), where other radios in the antenna group may share the minimum reservation, as further described herein.

[0025] The apparatus and methods described herein for allocating transmit energy between radios may facilitate improved wireless communication performance (e.g., improved signal quality at the receiver, lower latency, higher throughput, etc.). For example, a wireless device may allocate a portion of a minimum reservation to a radio that is actively transmitting, such that other radios that are not transmitting may not be allocated any portion of the reservation. Such allocation may allow the actively transmitting radio to obtain a reservation that facilitates improved wireless communication performance. The energy allocation described herein may allow reservations to be efficiently allocated between radios using different RATs.

[0026] As used herein, a radio may refer to a physical or logical transmission path associated with one or more active frequency bands, transceivers, and / or radio access technologies (RATs) (e.g., code division multiple access (CDMA), LTE, NR, IEEE 802.11, Bluetooth, etc.) for wireless communications. For example, for uplink carrier aggregation in LTE and / or NR, each of the active component carriers used for wireless communications may be considered a separate radio. Similarly, multi-band transmissions for IEEE 802.11 communications may be considered a separate radio for each frequency band (e.g., 2.4 GHz, 5 GHz, or 6 GHz). As used herein, "minimum reservation" or just "reservation" may refer to a minimum level of transmit power allocated to one or more radios within a specific duration (e.g., a transmission opportunity, a time window associated with a (time-averaged) RF exposure limit, or a portion thereof).

[0027] The following description provides an example of RF exposure compliance in a communication system, without limiting the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Each example may ignore, replace or add each process or component as appropriate. For example, the method described may be performed in a different order than described, and various steps may be added, omitted or combined. In addition, the features described for some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functions, or structures and functions that are supplemented or substituted for the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "used as an example, instance, or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having an advantage over other aspects.

[0028] Generally speaking, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as a radio technology, an air interface, etc. Frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs, or may support multiple RATs.

[0029] The techniques described herein can be used for various wireless networks and radio technologies. Although various aspects may be described herein using terms commonly associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, various aspects of the present disclosure may be applied to communication systems based on other generations and / or to wireless technologies such as 802.11, 802.15, etc.

[0030] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or greater), millimeter wave (mmWave) targeting high carrier frequency (e.g., 24 GHz to 53 GHz or greater), massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, and / or mission critical services targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability specifications. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe. NR supports beamforming and can dynamically configure beam directions. Multiple input multiple output (MIMO) transmission using precoding can also be supported as multi-layer transmission. Aggregation of multiple cells can be supported.

[0031] Example Wireless Communications Networks and Devices

[0032] Figure 1 An example wireless communication network 100 is illustrated in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network), an Evolved Universal Terrestrial Radio Access (E-UTRA) system (e.g., a 4G network), a Universal Mobile Telecommunications System (UMTS) (e.g., a 2G / 3G network), or a Code Division Multiple Access (CDMA) system (e.g., a 2G / 3G network), or may be configured for communication according to one or more of the IEEE standards such as the 802.11 standard. Figure 1 As shown, UE 120a includes an RF exposure manager 122 that uses reservations assigned to radios per antenna group to ensure RF exposure compliance, in accordance with aspects of the present disclosure.

[0033] like Figure 1 As illustrated in , the wireless communication network 100 may include multiple BSs 110a-110z (each also individually referred to herein as BS 110, or collectively referred to as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which may be stationary or movable depending on the location of a mobile BS. In some examples, BS 110 may use any suitable transport network to interconnect with each other and / or connect to one or more other BSs or network nodes (not shown) in the wireless communication network 100 through various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.). Figure 1In the example shown, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more cells.

[0034] BS 110 communicates with UEs 120a-y (each also individually referred to herein as UE 120 or collectively referred to herein as UE 120) in the wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a relay, etc.) that receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and transmits transmissions of the data and / or other information to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between UEs 120 to facilitate communication between devices.

[0035] The network controller 130 may communicate with a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via backhaul). In some cases, such as in a 5G NR system, the network controller 130 may include a centralized unit (CU) and / or a distributed unit (DU). In various aspects, the network controller 130 may communicate with a core network 132 (e.g., a 5G core network (5GC)), which provides various network functions such as access and mobility management, session management, user plane functions, policy control functions, authentication server functions, unified data management, application functions, network open functions, network repository functions, network slice selection functions, etc.

[0036] Figure 2 1 and 120a (eg, Figure 1 Example components of a wireless communication network 100).

[0037] At BS 110a, transmit processor 220 may receive data from data source 212 and control information from controller / processor 240. Control information may be used for physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GCPDCCH), etc. Data may be used for physical downlink shared channel (PDSCH), etc. Medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. MAC-CE may be carried in a shared channel such as PDSCH, physical uplink shared channel (PUSCH), or physical sidelink shared channel (PSSCH).

[0038] The processor 220 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, and / or reference symbols (where applicable), and may provide an output symbol stream to a modulator (MOD) in a transceiver 232a-232t. Each modulator in transceivers 232a to 232t may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each transceiver in transceivers 232a-232t may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. Downlink signals from transceivers 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0039] At UE 120a, antennas 252a-252r may receive downlink signals from BS110a and may provide received signals to transceivers 254a-254r, respectively. Transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) the corresponding received signals to obtain input samples. Each demodulator (DEMOD) in transceivers 232a-232t may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols (where applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to data sink 260, and provide decoded control information to controller / processor 280.

[0040] On the uplink, at the UE 120a, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for a reference signal (RS) (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by a modulator (MOD) 254a-254r in the transceiver (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At BS 110a, the uplink signal from UE 120a may be received by antenna 234, processed by demodulators in transceivers 232a-232t, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information transmitted by UE 120a. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller / processor 240.

[0041] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0042] The antenna 252, processors 266, 258, 264 and / or controller / processor 280 of the UE 120a and / or the antenna 234, processors 220, 230, 238 and / or controller / processor 240 of the BS 110a may be used to perform the various techniques and methods described herein. Figure 2 As shown, the controller / processor 280 of the UE 120a has an RF exposure manager 281 that represents the RF exposure manager 122, in accordance with aspects described herein. Although shown at the controller / processor, other components of the UE 120a and BS 110a may be used to perform the operations described herein.

[0043] NR can use orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. NR can use time division duplex (TDD) to support half-duplex operation. OFDM and single carrier frequency division multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, frequency bands, etc. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The system bandwidth can also be divided into subbands. For example, one subband can cover multiple resource blocks (RBs).

[0044] Although the reference Figure 1 and Figure 2 UE 120a is described as communicating with a BS and / or within a network, but UE 120a may be configured to communicate / transmit directly to another UE 120 or directly to another wireless device without relaying the communication through a network. Figure 2 The BS 110 a illustrated in FIG. 4 and described above is an example of another UE 120 .

[0045] Example RF Transceiver

[0046] Figure 3 is a block diagram of an example RF transceiver circuit 300 according to certain aspects of the present disclosure. The RF transceiver circuit 300 includes at least one transmit (TX) path 302 (also referred to as a transmit chain) for transmitting signals via one or more antennas 306 and at least one receive (RX) path 304 (also referred to as a receive chain) for receiving signals via antenna 306. When TX path 302 and RX path 304 share antenna 306, these paths can be connected to the antenna via interface 308, which can include any of a variety of suitable RF devices, such as switches, duplexers, diplexers, multiplexers, etc.

[0047] Receiving an in-phase (I) or quadrature (Q) baseband analog signal from a digital-to-analog converter (DAC) 310, the TX path 302 may include a baseband filter (BBF) 312, a mixer 314, a driver amplifier (DA) 316, and a power amplifier (PA) 318. The BBF 312, the mixer 314, and the DA 316 may be included in one or more radio frequency integrated circuits (RFICs). For some implementations, the PA 318 may be external to the RFIC.

[0048] The BBF 312 filters the baseband signal received from the DAC 310, and the mixer 314 mixes the filtered baseband signal with a transmit local oscillator (LO) signal to convert the baseband signal of interest to a different frequency (e.g., upconvert from baseband to radio frequency). This frequency conversion process produces sum and difference frequencies between the LO frequency and the frequency of the baseband signal of interest. The sum and difference frequencies are referred to as beat frequencies. The beat frequencies are typically in the RF range, so that the signal output by the mixer 314 is typically an RF signal, which may be amplified by the DA 316 and / or by the PA 318 before being transmitted through the antenna 306. Although one mixer 314 is illustrated, several mixers may be used to upconvert the filtered baseband signal to one or more intermediate frequencies and thereafter upconvert the intermediate frequency signal to a frequency for transmission.

[0049] The RX path 304 may include a low noise amplifier (LNA) 324, a mixer 326, and a baseband filter (BBF) 328. The LNA 324, the mixer 326, and the BBF 328 may be included in one or more RFICs, which may be the same RFIC as the RFIC that includes the TX path components, or may be a different RFIC. The RF signal received via the antenna 306 may be amplified by the LNA 324, and the mixer 326 mixes the amplified RF signal with a receive local oscillator (LO) signal to convert the RF signal of interest to a different baseband frequency (e.g., down-convert). The baseband signal output by the mixer 326 may be filtered by the BBF 328 before being converted to a digital I or Q signal by an analog-to-digital converter (ADC) 330 for digital signal processing.

[0050] Some transceivers may use a frequency synthesizer with a voltage controlled oscillator (VCO) to generate a stable, tunable LO with a specific tuning range. Thus, the transmit LO may be generated by a TX frequency synthesizer 320, which may be buffered or amplified by an amplifier 322 before being mixed with the baseband signal in a mixer 314. Similarly, the receive LO may be generated by an RX frequency synthesizer 332, which may be buffered or amplified by an amplifier 334 before being mixed with the RF signal in a mixer 326.

[0051] The controller 336 may direct the operation of the RF transceiver circuit 300, such as transmitting signals via the TX path 302 and / or receiving signals via the RX path 304. The controller 336 may be a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof. The memory 338 may store data and program code for operating the RF transceiver circuit 300. The controller 336 and / or the memory 338 may include control logic. In some cases, the controller 336 may determine the transmit power (e.g., a specific gain level at the PA 318) applied to the TX path 302 that complies with RF exposure limits set by country-specific regulations and / or international standards, as further described herein.

[0052] Example RF Exposure Compliance

[0053] RF exposure can be expressed in terms of specific absorption rate (SAR), which measures the energy absorbed per unit mass of human tissue and may have units of watts per kilogram (W / kg). RF exposure can also be expressed in terms of power density (PD), which measures the energy absorbed per unit area and may have units of mW / cm 2 In some cases, a maximum permissible exposure (MPE) limit (in the form of PD) may be imposed on wireless devices using transmit frequencies above 6 GHz. MPE limits are area-based exposure regulatory metrics, such as energy density limits, which are defined as the number of watts per square meter (W / m2) averaged over a defined area and time-averaged over a frequency-dependent time window. 2 )) to prevent hazardous human exposure represented by changes in tissue temperature.

[0054] SAR may be used to assess RF exposure for transmission frequencies less than 6 GHz, which covers wireless communication technologies such as 2G / 3G (e.g., CDMA), 4G (e.g., LTE), 5G (e.g., NR in the 6 GHz band), IEEE 802.11ac, etc. PD may be used to assess RF exposure for transmission frequencies above 6 GHz, which covers wireless communication technologies such as IEEE 802.11ad, 802.11ay, 5G in the millimeter wave band, etc. Therefore, different metrics may be used to assess RF exposure for different wireless communication technologies.

[0055] A wireless device (e.g., UE 120) may use multiple wireless communication technologies to send signals simultaneously. For example, a wireless device may use a first wireless communication technology (e.g., 3G, 4G, 5G, etc.) operating at or below 6 GHz and a second wireless communication technology (e.g., mmWave 5G in a 24 GHz to 60 GHz band, IEEE 802.11ad or 802.11ay) operating above 6 GHz to send signals simultaneously. In some aspects, a wireless device may use a first wireless communication technology (e.g., 3G, 4G, 5G, IEEE 802.11ac, etc. in a band below 6 GHz) (where RF exposure is measured in SAR) and a second wireless communication technology (e.g., 5G, IEEE 802.11ad, 802.11ay, etc. in a 24 GHz to 60 GHz band) (where RF exposure is measured in PD) to send signals simultaneously. As used herein, sub-6 GHz frequency bands may include frequency bands from 300 MHz to 6,000 MHz in some examples, and may include frequency bands within the range of 6,000 MHz and / or 7,000 MHz in some examples.

[0056] In some cases, compliance with RF exposure limits may be performed as a time-averaged RF exposure assessment over a specified time window (T) associated with the RF exposure limit (e.g., 2 seconds for the 60 GHz band, 100 or 360 seconds for bands ≤ 6 GHz, etc.). Figure 4A 4 is a graph 400A of transmit power (P(t)) over time within a time window (T) associated with RF exposure limits in accordance with certain aspects of the present disclosure. As an example, during certain transmit opportunities within the time window (T), the instantaneous transmit power may exceed the maximum time-averaged transmit power level P(t). limit That is, the transmission power can be greater than the maximum time average transmission power level P limit In some cases, the UE can P max To send, the P max is the maximum transmit power supported by the UE. In some cases, at some transmission opportunities, the UE can be less than or equal to the maximum time-averaged transmit power level P limit The maximum time average transmit power level P limit represents the time-averaged threshold value in terms of transmit power for RF exposure limit within a time window (T), and in some cases, P limit This may be referred to as a maximum time average power level or limit, or in terms of exposure, a maximum time average RF exposure level or limit. Graph 400A also illustrates gaps between transmit bursts, where a gap represents a period during which no transmission is being output from the device.

[0057] In some cases, the transmit power may be maintained at a maximum time-averaged transmit power level (e.g., P) allowed for RF exposure compliance that enables continuous transmission during the time window. limit ).For example, Figure 4B is a graph 400B of transmit power (P(t)) over time, illustrating a case where the transmit power is limited to P in accordance with certain aspects of the present disclosure. limit As shown in the figure, the UE can follow the RF exposure limit to P 限制 Send continuously.

[0058] Figure 4C 400C is a graph of transmit power (P(t)) over time illustrating a time-averaged mode that provides reserved power to enable continuous transmission within a time window (T) in accordance with certain aspects of the present disclosure. As shown, the transmit power may be increased from a maximum instantaneous power (P max ) falls back to the reserved power (P reserve ), so that the UE can continue to operate at a lower power (P reserve ) to maintain continuous transmission (e.g., maintain a radio connection with the receiving entity) during the time window. Figure 4C In P max The duration between P max and P reserve The area between can be equal to the area between P and limit and P reserve The area between Figure 4C The area of ​​the transmitted power (P(t)) in the time window T is equal to P limit This area can be considered to use 100% of the energy (transmitted power or exposure) to maintain compliance with the time-averaged RF exposure limit. reserve In the case of max The transmitter is turned off during the remainder of the time window to ensure compliance with the time-averaged RF exposure limits. reserve A fixed power level set to serve a certain purpose (e.g., reserving power for certain communications). max The transmission duration under P may be referred to as burst transmission time (or high power duration). When more margin is available in the future (after T seconds), the transmitter may be allowed to transmit again at a higher power (e.g., at P max (sent in short bursts below).

[0059] In some respects, Figure 4C In the time average mode illustrated in FIG, the UE can be above the average power level but less than P maxAlthough Figure 4C A single transmit burst is illustrated in FIG. 1 , but it should be understood that the UE may alternatively utilize multiple transmit bursts within the time window (T), such as described herein with respect to Figure 4A The transmit bursts may be maintained at a transmit power equal to or lower than P reserve In addition, it should be understood that the transmit power of each transmit burst may vary (within a burst and / or compared to other bursts), and at least a portion of the burst may be above a maximum average power level (e.g., P limit ) power to send.

[0060] Although FIG. 4A to FIG. 4C Continuous transmission within a window, opportunity, burst, etc. is illustrated, but it should be understood that a duty cycle of transmission can be implemented. In such a specific implementation, the transmission power may be periodically zero and maintained at a higher level during other parts of the duty cycle (e.g., such as FIG. 4A to FIG. 4C As used herein, a duty cycle of a transmission may refer to a portion (e.g., 5 ms) of a particular period (e.g., 500 ms) in which one or more signals are transmitted. In some cases, the duty cycle may be standardized (e.g., predetermined) with a particular RAT and / or may change over time, for example due to changes in radio conditions, mobility, and / or user behavior.

[0061] In some cases, a wireless device may evaluate RF exposure compliance with respect to one or more antenna groups, where an antenna group may be a collection of antennas and / or antenna modules. Antenna groups may be mutually exclusive with respect to RF exposure. For example, a wireless device may evaluate RF exposure compliance of an antenna group independent of RF exposure compliance of another antenna group. Antennas and / or antenna modules may support multiple RATs.

[0062] Figure 5is a block diagram illustrating an example grouping of multiple antennas of a wireless communication device 500 according to certain aspects of the present disclosure. In this example, the wireless communication device 500 (e.g., UE 120, such as a smartphone, or any wireless communication device described herein) includes a first antenna 502a, a second antenna 502b, a third antenna 502c, a fourth antenna 502d, a fifth antenna 502e, a sixth antenna 502f, and a seventh antenna 502g. The antennas 502a-502g are arranged into three antenna groups 504, 506, 508, which generally correspond to the top of the device 500, the bottom of the device 500, and the side of the device 500 when the device 500 is held in an upright position. Those skilled in the art will appreciate that more or less than seven antennas may be implemented, and / or more or less than three antenna groups may be defined. Each of the illustrated antennas 502a-502g may represent a single antenna, an antenna array (e.g., a phased array), or a module including one or more antennas. Antenna groups 504, 506, 508 may each include one or more antennas configured to transmit in a particular frequency band (e.g., very high (e.g., mmWave band), high (e.g., 6 GHz to 7 GHz band), mid (e.g., 3 GHz to 6 GHz band), or low (e.g., 400 MHz to 3 GHz band)), or the antenna groups may each include one or more antennas configured to transmit in multiple frequency bands.

[0063] In various aspects, the antenna groupings described herein may be assigned to various antenna groupings (such as millimeter wave groupings, sub-6 GHz groupings, low-band groupings (e.g., 400 MHz to 3 GHz bands), mixed-mode groupings (e.g., mmWave and sub-6 GHz groupings), multi-RAT groupings (e.g., WWAN and WLAN), groupings for different exposure scenarios and / or device positions relative to the user's body, etc.), for example, for different transmission scenarios. For example, under the millimeter wave grouping, each millimeter wave module (e.g., the first antenna 502a, the third antenna 502c, and the fifth antenna 502e) may be considered as a separate antenna group, where each millimeter wave module may have multiple antenna elements (e.g., 64 dual-polarized antenna elements) arranged in one or more arrays. The millimeter wave modules may be able to transmit various beams via predefined antenna configurations, where the beams may form a codebook. Under the sub-6 GHz grouping, the sub-6 GHz antennas may be grouped into separate groups. For example, the second antenna 502b and the fourth antenna 502d can be assigned to one group, and the sixth antenna 502f and the seventh antenna 502g can be assigned to another group. In some cases, the antennas 502a-502g can be assigned to mixed-mode groupings, such as three antenna groups 504, 506, 508. As illustrated, each antenna can be included in a separate antenna group, or one or more antennas can be included in multiple antenna groups.

[0064] Antenna groups may be defined and / or operated so as to be mutually exclusive in terms of RF exposure. In certain aspects, the transmit power of one or more of the antenna groups (or one or more of the antennas within one or more groups) may be reduced so that the (normalized) sum of the exposure or overlapping RF exposure distributions of all antenna groups is less than a certain value (e.g., 1.0).

[0065] In some cases, the wireless device may evaluate the RF exposure compliance of two radios of a particular RAT (e.g., LTE or 5G NR) or a class of RATs, such as WWAN access technologies (e.g., LTE and 5G NR). The wireless device may be configured with a minimum reservation per antenna group associated with two radios for WWAN communication and a ratio for dividing the minimum reservation between the radios when the two radios are actively transmitting at the same time. The minimum reservation may be configured in terms of a normalized exposure level. When the two radios are transmitting at the same time, the wireless device may divide the minimum reservation between the radios based on the configured ratio. When only one radio is transmitting, the wireless device may allocate at least the entire minimum reservation to the corresponding radio.

[0066] In dual radio transmission scenarios (e.g., LTE or NR inter-band carrier aggregation, dual connectivity, etc.), where both radios transmit in the same antenna group simultaneously (or in the same time interval associated with the time averaging time window), the secondary radio may be allocated a portion of the minimum reservation for a specific antenna group, as provided by the following expression:

[0067] Reserve radio2 = secondary_split_ratio AGk *NE totalMinRsv,AGk (1)

[0068] where secondary_split_ratio AGk represents the percentage of the minimum reservation allocated to the secondary radio, and NE totalMinRsv,AGk is the amount of minimum reservation allocated to a particular antenna group (AGk). The primary radio may be allocated the remainder of the minimum reservation given by:

[0069] Reserve radio1 = (1 – secondary_split_ratio AGk ) * NE totalMinRsv,AGk . (2)

[0070] In another dual radio transmission scenario, where two radios transmit simultaneously (or in the same time interval) in different antenna groups, the two radios may be allocated at least the respective minimum reservations (e.g., NE totalMinRsv,AGk ).

[0071] Example transmit energy distribution between different radio access technologies

[0072] A multi-mode / multi-band UE has multiple transmit antennas that can transmit simultaneously in the sub-6 GHz band and the frequency band greater than 6 GHz band (such as the mmWave band). As described herein, RF exposure in the sub-6 GHz band can be evaluated in terms of SAR, and RF exposure in the frequency band greater than 6 GHz can be evaluated in terms of PD. Due to regulations regarding simultaneous exposure, wireless devices can limit the maximum transmit power for both the sub-6 GHz band and the frequency band greater than 6 GHz.

[0073] Various aspects of the present disclosure provide apparatus and methods for allocating transmit energy between radios communicating via different RATs. For example, a wireless device may allocate a minimum reservation between radios in an antenna group. In some cases, the radios in an antenna group may communicate via WWAN (e.g., LTE and 5G NR) and WLAN access technologies (e.g., IEEE 802.11). The wireless device may allocate the minimum reservation between radios that will be actively transmitting at the same time. In some cases, a wireless device may be configured with a reservation dedicated to a specific RAT (such as Bluetooth), where other radios in the antenna group may share the minimum reservation, as further described herein.

[0074] The apparatus and methods described herein for allocating transmit energy between radios may facilitate improved wireless communication performance (e.g., improved signal quality at the receiver, lower latency, higher throughput, etc.). For example, a wireless device may allocate a portion of a minimum reservation to a radio that is actively transmitting, such that other radios that are not transmitting may not be allocated any portion of the reservation. Such allocation may allow the actively transmitting radio to obtain a reservation that facilitates improved wireless communication performance. The energy allocation described herein may allow reservations to be efficiently allocated between radios using different RATs.

[0075] In some aspects, a wireless device may be configured with specific reservation information for each antenna group, such as described herein with respect to Figure 5The antenna groups described herein may be associated with at least one of the antenna groups. At least one of the antenna groups may be associated with three or more radios. In some examples, the radios may communicate via two or more different RATs, where the different RATs may include, for example, a combination of WWAN and WLAN, a combination of WWAN and Bluetooth, or a combination of WWAN, WLAN, and Bluetooth. The reservation information may include a minimum reserved NE shared between the two or more radios. totalMinRsv,AGk and a radio specific split ratio. Each of the radios associated with the shared minimum reservation may be configured with a split ratio for determining the portion of the shared minimum allocated to the respective radio. Such configuration of the antenna group may allow the wireless device to efficiently allocate reservations on radios communicating via different RATs. The minimum reservation may be shared between radios that transmit at the same time as each other or transmit in the same time interval. As an example, if two of the radios in the antenna group transmit at the same time, the wireless device may divide the minimum reservation between the radios, as further described herein.

[0076] The wireless device may be configured with a per-radio split ratio associated with a shared minimum reservation. For an active radio (eg, radio (i)), the minimum reservation for a particular antenna group (NE totalMinRsv,AGk ) can be determined according to the following expression:

[0077]

[0078] Where radio(i).split_ratio is the split ratio for radio(i), ∑radio(active).split_ratio is the sum of the split ratios for radios that are active (e.g., actively transmitting in the same transmit opportunity or time interval of the time window associated with the time-averaged RF exposure limit), and i is the index of each radio that is active. An active radio may refer to a radio that may transmit or will transmit in a particular transmit time or (future) time interval of the time window associated with the time-averaged RF exposure limit. For example, an active radio may correspond to when the radio is (or may or will) actively transmit in a transmit opportunity or time interval of the time window. The portion of the reservation allocated to radios that are not active may be set to the remainder of the minimum reservation (such as zero).

[0079] Figure 66 is a table 600 illustrating example reservations for multiple radios (radio 1, radio 2, and radio 3) of an antenna group (e.g., antenna group 504, where the antennas in antenna group 504 are coupled to a total of three radios in this example) for different transmission scenarios. In this example, the antenna group may be associated with radio 1 (e.g., a sub-6 GHz radio for NR), radio 2 (e.g., a 2.4 GHz radio for IEEE 802.11), and radio 3 (e.g., a 5 GHz radio for IEEE 802.11), where the split ratio for each of radio 1, radio 2, and radio 3 is set to 1 / 3 or 33%. In terms of normalized exposure, the minimum reservation configured for the antenna group is set to 0.6. It should be understood that the split ratio value being the same between all radios is merely an example, and the split ratio value may vary between radios. The split ratio value may be adjusted based on various criteria, such as the priority and / or service associated with a particular radio. For example, services may include voice services, video services, gaming services, augmented or virtual reality services, video conferencing services, Internet-type services, WLAN peer-to-peer (P2P) services, cellular vehicle-to-network (CV2X) services, hotspot WLAN services, and the like. In some aspects, the reservation level assigned to a radio (or each radio) may depend on which services are mapped to the radio and / or the reservation level for such services. In some cases, certain services may be assigned reservations, such as reservation levels for each one or more services, and such service-based reservations may be determined as described herein with respect to radio-based reservations. For example, a first reservation may be assigned to a first service, and a second reservation may be assigned to a second service. Services may be distributed between multiple radios (e.g., a first radio may send a service associated with a first service, a second radio may send a service associated with a second service, etc.) or distributed on a single radio (e.g., a first radio may send a service associated with a first service and a second service).

[0080] In a first transmission scenario, where only radio 1 transmits in the antenna group, the wireless device may allocate at least the entire minimum reservation to radio 1. As described herein, the minimum reservation may correspond to a minimum level of transmit power allocated to a radio for a particular duration. In some cases, the wireless device may allow the radio to transmit at a power higher than the minimum reservation that complies with the time-averaged RF exposure limit (e.g., as Figure 4C P depicted in max ) is sent. According to expression (3), radio(i).split_ratio is equal to the sum of the split ratios for the active radios, so that radio 1 is allocated at least the minimum reserved NE totalMinRsv,AGkFor example, one or more of the radios may be allocated a reservation higher than the minimum reservation if additional margin is available and / or depending on one or more other criteria, such as the characteristics of the transmissions (e.g., possible high variability and / or burst mode) and / or the priority of the radios.

[0081] In a second transmission scenario, where all radios are active, the wireless device may allocate to each radio a portion of the minimum reservation that is proportional to the split ratio of the corresponding radio. According to expression (3), the sum of the split ratios for the active radios is equal to one (1), so that each of the radios receives a portion of the minimum reservation that is proportional to the split ratio of the corresponding radio.

[0082] In a third transmission scenario, where radio 1 and radio 2 are in active state, the wireless device may divide the minimum reservation between radio 1 and radio 2. According to expression (3), each of the split ratios of radio 1 and radio 2 is equal to half of the sum of the split ratios for the radios in active state, so that the minimum reservation is equally divided between radio 1 and radio 2.

[0083] In a fourth transmission scenario, where radio 2 and radio 3 are active, the wireless device may again divide the minimum reservation between radio 2 and radio 3. In a fifth transmission scenario, where radio 2 is active, the wireless device may divide at least the entire minimum reservation (NE totalMinRsv,AGk ) is assigned to Radio 2.

[0084] If a radio in another antenna group transmits simultaneously with one of Radio 1 -Radio 3, then the example reservation for the transmission scenario may remain the same since the antenna groups are mutually exclusive of each other in terms of exposure.

[0085] In some cases, the wireless device may be configured with specific reservation information for specific radios in the antenna group. For example, specific reservation information may be assigned to a Bluetooth radio in the antenna group. Such configuration may allow the wireless device to provide dedicated reservations for specific radios in certain transmission scenarios. For example, the reservation information may include different reservation levels (e.g., radio.reserve_level) for when a radio in the antenna group transmits alone (e.g., independently) in the antenna group, when two radios in the antenna group are active, and / or when three or more radios in the antenna group are active. AGk or BT.reserve_level AGk). The reservation information may guarantee a specific amount of reservation for a radio, regardless of whether the radio is transmitting. This configuration may allow the wireless device to transmit with the radio at least via the guaranteed reservation level and prevent the guaranteed reservation level from being used by another radio.

[0086] When a radio with dedicated reservation information is transmitting alone, the wireless device may use a specific reservation (e.g., 0.9 or 90%) for the radio associated with such a transmission scenario. When a radio with dedicated reservation information is transmitting with at least one other radio, the wireless device may use a different reservation for the radio. For example, the reservation for the radio may satisfy the following expression:

[0087] BT.reserve_level AGk +NE totalMinRsv,AGk < 1 (4)

[0088] Where BT.reserve_level AGk is a dedicated reservation for the Bluetooth radio, and NE totalMinRsv,AGk is the minimum reservation shared among other radios with different RATs, e.g., as described herein with respect to Figure 6 In some aspects, BT.reserve_level is set when another radio is transmitting via the Bluetooth radio. AGk The value of may be different from the value when two or more radios are transmitting over a Bluetooth radio. It should be understood that dedicated reservations may be configured for other types of radios, such as mmWave, WLAN, satellite communications, etc., and that more than one radio may have dedicated reservations. In addition, the radio with the dedicated reservation need not be a RAT separate from the other radios in the antenna group. For example, a dedicated reservation may be assigned to a radio associated with one or more frequency bands of a RAT, such as a dedicated reservation for a mmWave NR radio or a dedicated reservation for a sub-6 GHz NR radio.

[0089] Figure 7 700 for wireless communications in accordance with certain aspects of the present disclosure. Operations 700 may be performed, for example, by a wireless device (e.g., UE 120a in wireless communication network 100). Operations 700 may be implemented as a processor (e.g., Figure 2 In addition, the signal transmission and / or reception performed by the wireless device in operation 700 may be performed by one or more antennas (e.g., Figure 2In some aspects, the transmission and / or reception of signals by the wireless device may be achieved by obtaining and / or outputting signals via a bus interface of one or more processors (eg, controller / processor 280).

[0090] Operation 700 may optionally begin at block 702, where the wireless device may obtain reservation information associated with an antenna group (e.g., first antenna group 504) associated with a plurality of radios including a first radio and one or more second radios. The wireless device may obtain the reservation information via a memory. For example, the reservation information may be stored in a memory (e.g., memory 282 and / or memory 338), and the wireless device may access the memory to obtain the reservation information. In some cases, the wireless device may determine the reservation information, as further described herein. The first radio may communicate via a first type of RAT (e.g., WWAN), and the second radio may communicate via a second type of RAT (e.g., WLAN) that is different from the first type of RAT. For example, the wireless device may store the reservation information in a memory device (e.g., memory 282) and obtain the reservation information from the memory when determining a reservation for the radio.

[0091] At block 704, the wireless device may determine a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios, e.g., as described herein with respect to Figure 6 In some cases, the wireless device may determine a portion of the minimum reservation for a radio based on a split ratio associated with an active radio. In some cases, such as when a particular radio is not active, the wireless device may determine that the reservation for the particular radio is set to zero.

[0092] At block 706, the wireless device may transmit one or more signals using at least one of the radios at a transmit power determined at least in part based on the RF exposure limits associated with each of the radios and the reservation for each of the radios. For example, the wireless device may determine a transmit power that satisfies the RF exposure limits, wherein the transmit power of the radio corresponds to at least the reservation for the respective radio. In some cases, the RF exposure limits may include a maximum time-averaged RF exposure limit, such as described herein with respect to FIG. 4A to FIG. 4C As described, and / or all transmissions may be allocated a transmit power at or above (greater than or equal to) the reserved transmit power.

[0093] The reservation information may include various parameters associated with determining a reservation for a particular radio, e.g., as described herein with respect to expressions (3) and (4). The wireless device may be configured with reservation information for each antenna group. For example, the wireless device may be configured with specific reservation information for each of a first antenna group (e.g., first antenna group 504), a second antenna group (e.g., second antenna group 508), and a third antenna group (e.g., third antenna group 508).

[0094] In some cases, the reservation information may include a total reservation (e.g., NE totalMinRsv,AGk ). The total reservation may be the minimum reservation shared among the radios in the antenna group, e.g., as described herein with respect to Figure 6 The reservation information may include a split ratio associated with each of the radios sharing the total reservation, wherein the split ratio may be used to determine a portion of the total reservation allocated to the corresponding radio in an active state.

[0095] To determine the reservation for each of the multiple radios, the wireless device may determine the sum of the split ratios for each of the active radios, for example, according to expression (3). For example, according to expression (3), the wireless device may determine the reservation for each of the active radios as the product of the total reservation and the ratio of the split ratio for the corresponding radio to the sum of the split ratios. As an example, when only the radios in the antenna group are active, the wireless device may determine that the reservation for the radio is equal to the total reservation. When more than one of the radios in the antenna group is active, the wireless device may determine that the reservation for the radio is equal to a portion of the total reservation. The portion of the total reservation may be based on the split ratio associated with the particular radio.

[0096] In some aspects, the reservation information may include a reservation dedicated to a particular radio, e.g., as described herein with respect to expression (4). For example, the reservation information may include a first reservation associated with a first radio (e.g., BT.reserve_level AGk ) and a second reservation associated with a second radio (e.g., NE totalMinRsv,AGk). The first reservation and the second reservation may have one or more values ​​associated with a specific transmission scenario. In some aspects, the first reservation may have a certain value (e.g., between zero and one) regardless of whether the first radio is active. Each of the first reservation and the second reservation may include a first value for when only one of the radios is active, a second value for when two of the radios are active, and a third value for when three or more of the radios are active. The second value of the first reservation may be different from the third value of the first reservation, and the same applies to the second reservation. The second value and the third value may satisfy expression (4).

[0097] The reservation for each of the radios in the active state may correspond to a minimum level of transmit power allocated to the corresponding radio over a particular duration (e.g., a transmit occasion, a time window associated with an RF exposure limit, and / or a time interval of the time window). The reservation for a given radio may be allocated by the time average RF exposure algorithm for the entire duration of the operating time window of the active radio (e.g., 2 seconds, 100 seconds, or 360 seconds, depending on the transmit frequency and the corresponding time window of the RF exposure limit). The reservation may be maintained continuously (e.g., indefinitely) over the entire duration of the transmission when evaluating the running time average (the reservation in the time slot of the roll-out time window may be the same as the reservation for the time slot of the roll-in time window). It may be assumed that the transmission may continue indefinitely and the reservation may be provided indefinitely, which may be achieved by allocating the reservation for the entire duration of the time window of the active radio associated with the RF exposure limit.

[0098] In some aspects, the wireless device may determine the reservation information periodically or in response to one or more events. For example, the reservation information may be periodically determined in each time window associated with the time average RF exposure limit. In some cases, the reservation information may be determined in response to detecting the occurrence of a specific event, such as when the wireless device is powered on, when the wireless device detects a change in radio conditions, when the wireless device detects a change in the number of active radios, etc. In some cases, the reservation information may be preconfigured.

[0099] In certain aspects, the wireless device may determine the total reservation based on one or more criteria. For example, the total reservation may be determined based on past RF exposure associated with the radio, path loss associated with the radio, scheduling rate associated with the radio, duty cycle associated with the radio, expected transmission duration associated with the radio, data buffer associated with the radio, or any combination thereof. For example, a high duty cycle associated with the radio may allow the wireless device to increase the total reservation. As another example, the data buffer may indicate the expected transmission duration associated with the radio, and the wireless device may adjust the total reservation in response to the expected transmission duration. A data buffer with a large amount of data may indicate a long transmission time, and the wireless device may increase the total reservation in response to the transmission time based on the size of the data in the buffer. The wireless device may dynamically adjust the total reservation periodically and / or in response to certain events (such as changes associated with one or more criteria). It should be understood that alternative or additional criteria may be used to determine the total reservation allocated between radios. Each criterion may be associated with a separate radio or evaluated separately for several radios, and / or may be evaluated cumulatively for multiple radios.

[0100] For certain aspects, the wireless device may allocate reservations between radios associated with the antenna groups based on one or more criteria. As an example, the wireless device may allocate reservations between radios based on: limit , past RF exposure usage associated with the radio, path loss associated with the radio, data bandwidth associated with the radio, scheduling rate or duty cycle associated with the radio, network load, energy per byte (or performance per watt) associated with the radio, link quality (or channel quality) of each radio link, expected transmission duration associated with the radio, data buffer associated with the radio, radio conditions, or any combination thereof. As an example, the wireless device may allocate a larger reservation to a radio with a stronger link quality or lower path loss than other radios. As another example, the wireless device may allocate a larger reservation to a radio with a longer expected transmission duration than other radios, where the size of the data buffer may represent the expected transmission duration of a particular radio. For example, reservations may be allocated based on a service or priority associated with each radio. In some such examples, the allocation of reservations is dynamic and may change over time based on the service used by the wireless device (e.g., as negotiated with the network or assigned by the network). The allocation of reservations between radios may be performed periodically and / or in response to certain events (such as changes associated with one or more standards). As another example, a radio associated with a high priority may be allocated more reservations than another radio associated with a low priority.It should be appreciated that additional or alternative criteria may be used to determine the reservations allocated between radios.

[0101] The allocation of reservations may be performed by adjusting the split ratio associated with the radio. For example, the split ratio may favor links with more efficient links (e.g., with lower energy per byte, lower path loss, higher P limit In some cases, the split ratio may favor radios with less efficient links (e.g., higher path loss) to balance performance between radios.

[0102] Operation 700 may be performed for each antenna group. The wireless device may be configured with reservation information for each antenna group and apply the corresponding reservation information to the antenna group when the particular antenna group is actively transmitting. Since the antenna groups may be configured to be mutually exclusive with respect to RF exposure, operation 700 may be performed separately for each antenna group. For example, operation 700 may be performed simultaneously for another antenna group.

[0103] The wireless device may be configured with multiple antenna group sets, and the wireless device may have different reservation information configured for each antenna group in the multiple antenna group sets. For example, the wireless device may have an antenna group (or antenna group set) configured for a specific exposure scenario (e.g., head exposure), and another antenna group (or another antenna group set) configured for a different exposure scenario (e.g., hand and body exposure). The wireless device may select an antenna group for the corresponding exposure scenario, and the wireless device may select the reservation information associated with the corresponding antenna group.

[0104] although Figures 1 to 7 The examples depicted in the are described herein with respect to a UE that performs various methods for providing RF exposure compliance to facilitate understanding, but aspects of the present disclosure may also be applied to other wireless devices that perform the RF exposure compliance described herein, such as wireless stations, access points, base stations, and / or customer premises equipment (CPE). In addition, although these examples are described with respect to communications between a UE (or other wireless device) and a network entity, a UE or other wireless device may communicate with a device other than a network entity (e.g., another UE) or with another device in a user's home that is not a network entity.

[0105] It will be appreciated that the allocation of transmit energy among radios described herein may achieve desired wireless communication performance, such as reduced latency, increased uplink data rates, and / or uplink connectivity at the cell edge.

[0106] Example Communication Device

[0107] Figure 8 Examples include operations that may be configured to perform the techniques disclosed herein (such as Figure 7800 (e.g., UE 120) includes various components (e.g., corresponding to means plus function components) of the communication device 800 (e.g., the operations illustrated in the figure). The communication device 800 includes a processing system 802 that can be coupled to a transceiver 808 (e.g., a transmitter and / or a receiver). The transceiver 808 is configured to send and receive signals for the communication device 800 via an antenna 810, such as various signals as described herein. The processing system 802 can be configured to perform processing functions of the communication device 800, including processing signals received and / or to be transmitted by the communication device 800.

[0108] The processing system 802 includes a processor 804 coupled to a computer readable medium / memory 812 via a bus 806. In certain aspects, the computer readable medium / memory 812 is configured to store instructions that, when executed by the processor 804, cause the communication device 800 to execute Figure 7 The illustrated operations 700 or instructions (e.g., computer executable code) for performing other operations of the various techniques discussed herein for providing RF exposure compliance. In some aspects, the computer readable medium / memory 812 stores code 814 for obtaining, code 816 for determining, code 818 for sending (or outputting), or any combination thereof.

[0109] In some aspects, the processing system 802 has circuitry 820 configured to implement code stored in the computer-readable medium / memory 812. In some aspects, the circuitry 820 is coupled to the processor 804 and / or the computer-readable medium / memory 812 via the bus 806. For example, the circuitry 820 includes circuitry 822 for obtaining, circuitry 824 for determining, circuitry 826 for sending (or outputting), or any combination thereof.

[0110] In some examples, means for sending or transmitting (or means for outputting for sending) may include Figure 2 The transceiver 254 and / or antenna 252 and / or Figure 8 8 and antenna 810 of the communication device 800.

[0111] In some cases, a device may not actually send, for example, signals and / or data, but may have an interface (components for outputting) signals and / or data for transmission. For example, a processor may output signals and / or data to a radio frequency (RF) front end via a bus interface for transmission. Similarly, a device may not actually receive signals and / or data, but may have an interface (components for obtaining) for obtaining signals and / or data received from another device. For example, a processor may obtain (or receive) signals and / or data from an RF front end via a bus interface for reception. In various aspects, the RF front end may include various components, including transmit and receive processors, transmit and receive MIMO processors, modulators, demodulators, etc., such as Figure 2 as depicted in the example.

[0112] In some examples, the means for obtaining and / or the means for determining may include various processing system components, such as: Figure 8 or in the processor 804; or Figure 2 1 , including a receive processor 258, a transmit processor 264, a TX MIMO processor 266, and / or a controller / processor 280.

[0113] Example aspects

[0114] Specific implementation examples are described in the following numbered clauses:

[0115] Clause 1: A method for wireless communications by a wireless device, the method comprising: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and transmitting one or more signals using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios.

[0116] Clause 2: The method of clause 1, wherein the reservation information comprises a total reservation associated with all of the plurality of radios in the antenna group.

[0117] Clause 3: The method of clause 1 or 2, wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios.

[0118] Clause 4: A method according to clause 3, wherein each of the first reservation and the second reservation includes: a first value for when only one of the multiple radios is in the active state, a second value for when only two of the multiple radios are in the active state, and a third value for when three or more of the multiple radios are in the active state.

[0119] Clause 5: The method of any of clauses 1 to 4, wherein the reservation information comprises a split ratio associated with each of the plurality of radios that share a total reservation.

[0120] Clause 6: A method according to clause 5, wherein determining the reservation for each of the multiple radios includes: determining the sum of the split ratios for each of the radios in the active state; and determining the reservation for each of the radios in the active state as the product of the total reservation and the ratio of the split ratio for the corresponding radio to the sum of the split ratios.

[0121] Clause 7: The method of any of clauses 1 to 5, wherein determining the reservation for each of the plurality of radios comprises determining that the reservation for a radio is equal to a total reservation when only the radios in the antenna group are in the active state.

[0122] Clause 8: A method as described in any of clauses 1 to 5, wherein determining the reservation for each of the multiple radios includes determining that the reservation for a radio is equal to a portion of a total reservation when more than one of the radios in the antenna group is in the active state.

[0123] Clause 9: The method of any preceding clause, wherein the reservation for each of the plurality of radios is a minimum level of transmit power allocated to the respective radio within a time window associated with the RF exposure limit.

[0124] Clause 10: The method of any preceding clause, wherein the RF exposure limit comprises a maximum time-averaged RF exposure limit.

[0125] Clause 11: The method of any preceding clause, wherein determining the reservation for each of the plurality of radios comprises determining the reservation for each of the plurality of radios based further at least in part on one or more criteria.

[0126] Clause 12: A method according to clause 11, wherein the one or more criteria include: a maximum time-averaged transmit power level associated with the multiple radios, past RF exposure associated with the multiple radios, a path loss associated with the multiple radios, a data bandwidth associated with the multiple radios, a scheduling rate or duty cycle associated with the multiple radios, a network load, energy per byte associated with the multiple radios, a link quality associated with the multiple radios, an expected transmit duration associated with the multiple radios, a data buffer associated with the multiple radios, or any combination thereof.

[0127] Clause 13: A method as described in any preceding clause, wherein the reservation information is based on reservation levels of services mapped to the plurality of radios.

[0128] Clause 14: An apparatus for wireless communications, the apparatus comprising: a memory; and at least one processor coupled to the memory, the at least one processor configured to: obtain reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determine a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and transmit one or more signals using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios.

[0129] Clause 15: The apparatus of clause 14, wherein the reservation information comprises a total reservation associated with all of the plurality of radios in the antenna group.

[0130] Clause 16: An apparatus as recited in clause 14 or 15, wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios.

[0131] Clause 17: An apparatus according to clause 16, wherein each of the first reservation and the second reservation includes: a first value for when only one of the multiple radios is in the active state, a second value for when only two of the multiple radios are in the active state, and a third value for when three or more of the multiple radios are in the active state.

[0132] Clause 18: An apparatus as recited in any of clauses 14 to 17, wherein the reservation information comprises a split ratio associated with each of the plurality of radios that share a total reservation.

[0133] Clause 19: An apparatus according to clause 18, wherein in order to determine the reservation for each of the multiple radios, the at least one processor is further configured to: determine the sum of the split ratios for each of the radios in the active state, and determine the reservation for each of the radios in the active state as the product of the total reservation and the ratio of the split ratio for the corresponding radio to the sum of the split ratios.

[0134] Clause 20: An apparatus according to any one of clauses 14 to 19, wherein to determine the reservation for each of the plurality of radios, the at least one processor is further configured to determine that the reservation for a radio is equal to a total reservation when only the radio in the antenna group is in the active state.

[0135] Clause 21: An apparatus according to any of clauses 14 to 19, wherein in order to determine the reservation for each of the plurality of radios, the at least one processor is further configured to determine that the reservation for a radio is equal to a portion of a total reservation when more than one of the radios in the antenna group is in the active state.

[0136] Clause 22: An apparatus as recited in any of clauses 14 to 21, wherein the reservation for each of the plurality of radios is a minimum level of transmit power allocated to the respective radio within a time window associated with the RF exposure limit.

[0137] Clause 23: The apparatus of any of clauses 14 to 22, wherein the RF exposure limit comprises a maximum time-averaged RF exposure limit.

[0138] Clause 24: An apparatus according to any one of clauses 14 to 23, wherein in order to determine the reservation for each of the plurality of radios, the at least one processor is further configured to further determine the reservation for each of the plurality of radios based at least in part on one or more criteria.

[0139] Clause 25: An apparatus according to clause 24, wherein the one or more criteria include: a maximum time-averaged transmit power level associated with the multiple radios, past RF exposure associated with the multiple radios, a path loss associated with the multiple radios, a data bandwidth associated with the multiple radios, a scheduling rate or duty cycle associated with the multiple radios, a network load, energy per byte associated with the multiple radios, a link quality associated with the multiple radios, an expected transmit duration associated with the multiple radios, a data buffer associated with the multiple radios, or any combination thereof.

[0140] Clause 26: An apparatus according to any one of clauses 14 to 25, wherein in order to determine the reservation for each of the multiple radios, the at least one processor is configured to further determine the reservation for each of the multiple radios based on a service or priority associated with each of the multiple radios.

[0141] Clause 27: A non-transitory computer-readable medium having stored thereon instructions for: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; and transmitting one or more signals using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios.

[0142] Clause 28: The non-transitory computer-readable medium of clause 27, wherein the reservation information comprises a total reservation associated with all of the plurality of radios in the antenna group.

[0143] Clause 29: The non-transitory computer-readable medium of clause 27 or 28, wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios.

[0144] Clause 30: A non-transitory computer-readable medium as described in clause 29, wherein each of the first reservation and the second reservation includes: a first value for when only one of the multiple radios is in the active state, a second value for when only two of the multiple radios are in the active state, and a third value for when three or more of the multiple radios are in the active state.

[0145] Clause 31: The non-transitory computer-readable medium of any of clauses 27 to 30, wherein the reservation information comprises a split ratio associated with each of the plurality of radios that share a total reservation.

[0146] Clause 32: A non-transitory computer-readable medium as described in clause 31, wherein determining the reservation for each of the plurality of radios comprises: determining a sum of split ratios for each of the plurality of radios in the active state; and determining the reservation for each of the plurality of radios in the active state as the product of the total reservation and the ratio of the split ratio for the corresponding radio to the sum of the split ratios.

[0147] Clause 33: An apparatus comprising: a memory comprising executable instructions; and one or more processors, the one or more processors configured to execute the executable instructions and cause the apparatus to perform a method according to any one of clauses 1 to 13.

[0148] Clause 34: An apparatus comprising means for performing the method of any one of clauses 1 to 13.

[0149] Clause 35: A non-transitory computer-readable medium comprising: executable instructions that, when executed by one or more processors of a device, cause the device to perform the method of any one of clauses 1 to 13.

[0150] Clause 36: A computer program product embodied on a computer readable storage medium, the computer program product comprising: code for performing the method according to any one of clauses 1 to 13.

[0151] The techniques described herein may be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks may implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are parts of Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). NR is an emerging wireless communication technology under development.

[0152] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow restricted access by UEs associated with a femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS.

[0153] UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.)), an entertainment device (e.g., a music device, a video device, a satellite radio, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered as machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that can communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0154] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. A scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities use resources allocated by the scheduling entity. The base station is not the only entity that acts as a scheduling entity. In some examples, a UE may be used as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communications. In some examples, a UE may be used as a scheduling entity in a peer-to-peer (P2P) network or in a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0155] The methods disclosed herein include one or more steps or actions for implementing the methods. The method steps and / or actions may be interchangeable with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions may be modified without departing from the scope of the claims.

[0156] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items (including single members). As an example, "at least one of a, b, or c" is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0157] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, generating, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Furthermore, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0158] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but should be given the full scope consistent with the language of the claims, where, unless otherwise specified, references to elements in the singular form are not intended to mean "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure that are known or will be known to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, whether or not such disclosure is explicitly stated in the claims. Any claim element should not be interpreted according to the provisions of 35 U.S.C. §112 (f), unless the element is explicitly stated using the phrase "member for...", or in the case of a method claim, the element is stated using the phrase "step for...".

[0159] The various operations of the above method can be performed by any suitable member capable of performing the corresponding function. The member may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Typically, where there are operations illustrated in the accompanying drawings, those operations may have corresponding corresponding members plus functional components with similar numbers.

[0160] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0161] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application of the processing system and the overall design constraints, the bus may include any number of interconnecting buses and bridges. The bus may link various circuits together, including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement signal processing functions at the physical (PHY) layer. In the UE (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art and therefore will not be described further. The processor may be implemented using one or more general purpose processors and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how best to implement the described functionality of the processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0162] If implemented in software, each function may be stored on or sent through a computer-readable medium as one or more instructions or codes. Software should be broadly interpreted as meaning instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include both computer storage media and communication media, including any media that facilitates the transfer of computer programs from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium may be integral with the processor. For example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or in addition thereto, a machine-readable medium or any part thereof may be integrated into a processor, such as in the case of having a cache and / or a general register stack. By way of example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read only memory), PROM (programmable read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be implemented in a computer program product.

[0163] A software module may include a single instruction, perhaps multiple instructions, and may be distributed over several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or may be distributed across multiple storage devices. By way of example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some of the instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register stack for execution by the processor. When the functionality of a software module is mentioned below, it will be understood that such functionality is implemented by the processor when executing instructions from the software module.

[0164] Additionally, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared (IR), radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology such as infrared, radio, and microwave are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks use lasers to reproduce data optically. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0165] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, such as for performing the operations described herein and in Figure 7 Instructions for the operations illustrated in .

[0166] In addition, it should be understood that the modules and / or other appropriate components for executing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transfer of components for executing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, or a physical storage medium such as a compact disc (CD) or a floppy disk) so that the user terminal and / or base station can obtain the various methods when the storage component is coupled to or provided to the device. In addition, any other appropriate technology for providing the methods and techniques described herein to the device can be used.

[0167] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a wireless device, the method comprising: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; as well as One or more signals are transmitted using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios. 2 . The method of claim 1 , wherein the reservation information comprises a total reservation associated with all of the plurality of radios in the antenna group. 3 . The method of claim 1 , wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios.

4. The method of claim 3, wherein each of the first reservation and the second reservation comprises: a first value for when only one of the plurality of radios is in the active state, a second value for when only two of the plurality of radios are in the active state, and A third value is for when three or more of the plurality of radios are in the active state. 5 . The method of claim 1 , wherein the reservation information comprises a split ratio associated with each of the plurality of radios that share a total reservation.

6. The method of claim 5, wherein determining the reservation for each of the plurality of radios comprises: determining a sum of the split ratios for each of the radios in the active state; as well as The reservation for each of the radios in the active state is determined as a product of the total reservation and a ratio of the partition ratio for the respective radio to the sum of the partition ratios.

7. The method of claim 1, wherein determining the reservation for each of the plurality of radios comprises determining that the reservation for a radio is equal to a total reservation when only the radio in the antenna group is in the active state.

8. The method of claim 1, wherein determining the reservation for each of the plurality of radios comprises determining that the reservation for a radio is equal to a portion of a total reservation when more than one of the radios in the antenna group is in the active state.

9. The method of claim 1, wherein the reservation for each of the plurality of radios is a minimum level of transmit power allocated to the respective radio within a time window associated with the RF exposure limit.

10. The method of claim 1, wherein the RF exposure limit comprises a maximum time-averaged RF exposure limit.

11. The method of claim 1 , wherein determining the reservation for each of the plurality of radios comprises determining the reservation for each of the plurality of radios based further at least in part on one or more criteria.

12. The method of claim 11, wherein the one or more criteria include: a maximum time-averaged transmit power level associated with the plurality of radios, past RF exposures associated with the plurality of radios, path losses associated with the plurality of radios, a data bandwidth associated with the plurality of radios, a scheduling rate or duty cycle associated with the plurality of radios, Network load, an energy per byte associated with the plurality of radios, link qualities associated with the plurality of radios, expected transmission durations associated with the plurality of radios, data buffers associated with the plurality of radios, or Any combination of them.

13. The method of claim 1, wherein the reservation information is based on reservation levels of services mapped to the plurality of radios.

14. An apparatus for wireless communication, the apparatus comprising: Memory; and at least one processor coupled to the memory, the at least one processor configured to: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology, determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios, and One or more signals are transmitted using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios.

15. The apparatus of claim 14, wherein the reservation information comprises a total reservation associated with all of the radios in the antenna group.

16. The apparatus of claim 14, wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios.

17. The apparatus of claim 16, wherein each of the first reservation and the second reservation comprises: for a first value when only one of the plurality of radios is in the active state, a second value for when only two of the plurality of radios are in the active state, and A third value is for when three or more of the plurality of radios are in the active state.

18. The device of claim 14, wherein the reservation information comprises a partition ratio associated with each of the plurality of radios that share a total reservation.

19. The apparatus of claim 18, wherein to determine the reservation for each of the plurality of radios, the at least one processor is further configured to: determining a sum of the split ratios for each of the radios in the active state, and The reservation for each of the radios in the active state is determined as a product of the total reservation and a ratio of the partition ratio for the respective radio to the sum of the partition ratios.

20. The apparatus of claim 14, wherein to determine the reservation for each of the plurality of radios, the at least one processor is further configured to determine that the reservation for a radio is equal to a total reservation when only the radio in the antenna group is in the active state.

21. The apparatus of claim 14, wherein to determine the reservation for each of the plurality of radios, the at least one processor is further configured to determine that the reservation for a radio is equal to a portion of a total reservation when more than one of the radios in the antenna group is in the active state.

22. The apparatus of claim 14, wherein the reservation for each of the plurality of radios is a minimum level of transmit power allocated to the respective radio within a time window associated with the RF exposure limit.

23. The apparatus of claim 14, wherein the RF exposure limit comprises a maximum time-averaged RF exposure limit.

24. The apparatus of claim 14, wherein to determine the reservation for each of the plurality of radios, the at least one processor is further configured to determine the reservation for each of the plurality of radios based further at least in part on one or more criteria.

25. The apparatus of claim 24, wherein the one or more criteria include: a maximum time-averaged transmit power level associated with the plurality of radios, past RF exposures associated with the plurality of radios, path losses associated with the plurality of radios, a data bandwidth associated with the plurality of radios, a scheduling rate or duty cycle associated with the plurality of radios, Network load, an energy per byte associated with the plurality of radios, link qualities associated with the plurality of radios, expected transmission durations associated with the plurality of radios, data buffers associated with the plurality of radios, or Any combination of them.

26. The apparatus of claim 14, wherein to determine the reservation for each of the plurality of radios, the at least one processor is configured to determine the reservation for each of the plurality of radios further based on a service or priority associated with each of the plurality of radios.

27. A computer readable medium having stored thereon instructions for: obtaining reservation information associated with an antenna group associated with a plurality of radios including a first radio and one or more second radios, wherein the first radio communicates via a first type of radio access technology, and wherein the one or more second radios communicate via a second type of radio access technology different from the first type of radio access technology; determining a reservation for each of the plurality of radios based at least in part on the reservation information and an activity state associated with each of the plurality of radios; as well as One or more signals are transmitted using at least one of the plurality of radios at a transmit power determined at least in part based on a radio frequency (RF) exposure limit associated with each of the plurality of radios and the reservation for each of the plurality of radios.

28. The computer-readable medium of claim 27, wherein the reservation information comprises a total reservation associated with all of the plurality of radios in the antenna group.

29. The computer-readable medium of claim 27, wherein the reservation information comprises a first reservation associated with the first radio and a second reservation associated with the one or more second radios, and wherein each of the first reservation and the second reservation comprises: a first value for when only one of the plurality of radios is in the active state, a second value for when only two of the plurality of radios are in the active state, and A third value is for when three or more of the plurality of radios are in the active state.

30. The computer-readable medium of claim 27, wherein the reservation information comprises a split ratio associated with each of the plurality of radios that share a total reservation, and wherein determining the reservation for each of the plurality of radios comprises: determining a sum of split ratios for each of the plurality of radios in the active state; as well as The reservation for each of the plurality of radios in the active state is determined as a product of the total reservation and a ratio of the partition ratio for the respective radio to the sum of the partition ratios.

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