TECHNIQUES FOR SIGNALING Maximum allowable exposure FALLBACK INDICATION

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may determine an average energy level radiated by the UE over a period of time. The UE may determine whether an average energy level radiated by the UE over a time period exceeds a maximum allowable exposure (MPE) limit. The UE may transmit a medium access control (MAC) control element (MAC-CE) to the base station based at least in part on an average energy level radiated by the UE over a period of time exceeding the MPE limit, the MAC-CE including information related to a power management maximum power reduction (P-MPR) applied at the UE or an uplink duty cycle effective at the UE. Numerous other aspects are provided.

Description

[0001] This application is a divisional application of a patent application with a filing date of April 9, 2020, entitled “Technology for Signaling Maximum Allowable Exposure Backoff Indication” and application number 202080098934.7. Technical Field

[0002]

[0006] Generally speaking, aspects of the present disclosure relate to wireless communications and to techniques and apparatus for signaling a maximum permitted exposure (MPE) backoff indication. Background Art

[0003] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard released by the Third Generation Partnership Project (3GPP).

[0004] A wireless communication network may include multiple base stations (BSs) that can support communications for multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to a communication link from a BS to a UE, and an uplink (or reverse link) refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0005] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global level. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation, so as to better support mobile broadband Internet access. However, as the demand for mobile broadband access continues to grow, there is a need for further improvement of LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0006] In some aspects, a wireless communication method performed by a user equipment (UE) may include: determining an average energy level radiated by the UE over a time period; determining whether the average energy level radiated by the UE over the time period exceeds a maximum permitted exposure (MPE) limit; and sending a medium access control (MAC) control element (MAC-CE) to a base station based at least in part on the average energy level radiated by the UE over the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at the UE or an uplink duty cycle effective at the UE.

[0007] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: determine an average energy level radiated by the UE over a time period; determine whether the average energy level radiated by the UE over the time period exceeds an MPE limit; and send a MAC-CE to a base station based at least in part on the average energy level radiated by the UE over the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a P-MPR applied at the UE or an uplink duty cycle effective at the UE.

[0008] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a UE, the one or more processors may perform the following operations: determining an average energy level radiated by the UE over a time period; determining whether the average energy level radiated by the UE over the time period exceeds an MPE limit; and sending a MAC-CE to a base station based at least in part on the average energy level radiated by the UE over the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a P-MPR applied at the UE or an uplink duty cycle effective at the UE.

[0009] In some aspects, an apparatus for wireless communication may include: a unit for determining an average energy level radiated by the apparatus over a time period; a unit for determining whether the average energy level radiated by the apparatus over the time period exceeds an MPE limit; and a unit for sending a MAC-CE to a base station based at least in part on the average energy level radiated by the apparatus over the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a P-MPR applied at the apparatus or an uplink duty cycle effective at the apparatus.

[0010] In some aspects, the MAC-CE includes at least one power headroom entry having a separate bit for indicating whether a P-MPR applied at the UE has a zero value or a non-zero value for the corresponding cell.

[0011] In some aspects, the single bit corresponds to the first bit in the first octet of the MAC-CE.

[0012] In some aspects, the MAC-CE includes at least one power headroom entry including two bits for indicating values ​​or states representing a plurality of possible values ​​associated with a P-MPR applied at the UE for the corresponding cell.

[0013] In some aspects, two bits are set to a predefined value to indicate that the P-MPR applied at the UE has a value of zero.

[0014] In some aspects, at least one power headroom entry also includes a field for indicating an uplink duty cycle effective at the UE.

[0015] In some aspects, the MAC-CE includes at least one power headroom entry, the at least one power headroom entry including: a first bit for indicating whether the MAC-CE includes a field for indicating a value of a P-MPR applied at the UE for the corresponding cell, and a second bit for indicating whether the MAC-CE includes a field for indicating an uplink duty cycle valid at the UE for the corresponding cell.

[0016] In some aspects, the MAC-CE includes one or more cell identifiers and one or more P-MPR entries, each P-MPR entry including: a first field for indicating a value of the P-MPR applied at the UE for the corresponding cell, and a second field for indicating an uplink duty cycle effective at the UE for the corresponding cell.

[0017] In some aspects, the MAC-CE includes a bitmap for indicating one or more cell identifiers corresponding to one or more P-MPR entries.

[0018] In some aspects, the MAC-CE explicitly indicates one or more cell identifiers corresponding to one or more P-MPR entries.

[0019] In some aspects, the MAC-CE includes at least one beam failure recovery entry, and the at least one beam failure recovery entry includes a field for indicating a value of a P-MPR applied at the UE or an uplink duty cycle effective at the UE for the corresponding cell.

[0020] In some aspects, at least one beam failure recovery entry also includes a bit having: a first value for indicating that the field indicates a value of the P-MPR applied at the UE, or a second value for indicating that the field indicates an uplink duty cycle effective at the UE for the corresponding cell.

[0021] In some aspects, a MAC-CE is sent according to a periodic P-MPR reporting interval configured by a base station to periodically report information related to a P-MPR applied at a UE or an uplink duty cycle effective at the UE.

[0022] In some aspects, a MAC-CE is sent to a base station to periodically report information related to a P-MPR applied at a UE or an uplink duty cycle effective at the UE according to a P-MPR reporting interval, and the P-MPR reporting interval is at least partially based on the uplink duty cycle effective at the UE.

[0023] In some aspects, the MAC-CE is sent based at least in part on one or more of: a current value of the P-MPR applied at the UE satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the UE satisfies a threshold, or information received from a base station triggers reporting of the P-MPR applied at the UE.

[0024] In some aspects, the MAC-CE is sent based at least in part on expiration of a P-MPR prohibit timer configured by the base station.

[0025] In some aspects, a method performed by a UE may include: sending a request for an uplink grant to a base station based at least in part on determining that the UE does not have an available uplink grant, wherein the request indicates that a P-MPR reporting event has occurred at the UE; and receiving the uplink grant, wherein the MAC-CE is sent using the uplink grant.

[0026] In some aspects, the UE may send a request for an uplink grant to a base station based at least in part on determining that the UE does not have an available uplink grant, wherein the request indicates that a P-MPR reporting event has occurred at the UE; and receive an uplink grant, wherein the MAC-CE is sent using the uplink grant.

[0027] In some aspects, the one or more instructions also cause one or more processors of the UE to perform the following operations: sending a request for an uplink grant to a base station based at least in part on determining that the UE does not have an available uplink grant, wherein the request indicates that a P-MPR reporting event has occurred at the UE; and receiving an uplink grant, wherein the MAC-CE is sent using the uplink grant.

[0028] In some aspects, the apparatus may include: a unit for sending a request for an uplink grant to a base station based at least in part on determining that the UE does not have an available uplink grant, wherein the request indicates that a P-MPR reporting event has occurred at the UE; and a unit for receiving the uplink grant, wherein the MAC-CE is sent using the uplink grant.

[0029] In some aspects, the request for an uplink grant is sent using one or more of a physical uplink control channel resource or a random access channel procedure.

[0030] In some aspects, the MAC-CE is sent using one or more of: a pre-scheduled uplink grant, a dynamic uplink grant, or an uplink grant associated with a random access response message received from a base station.

[0031] In some aspects, the method performed by the UE may include incrementing an MPE detection counter based at least in part on an average energy level radiated by the UE over a time period exceeding an MPE limit, wherein the MAC-CE is sent based at least in part on the MPE detection counter satisfying a threshold.

[0032] In some aspects, the UE may increment an MPE detection counter based at least in part on an average energy level radiated by the UE over a time period exceeding an MPE limit, wherein the MAC-CE is sent based at least in part on the MPE detection counter satisfying the threshold.

[0033] In some aspects, the one or more instructions further cause one or more processors of the UE to perform the following operations: increment an MPE detection counter based at least in part on an average energy level radiated by the UE over a time period exceeding an MPE limit, wherein the MAC-CE is sent based at least in part on the MPE detection counter satisfying a threshold.

[0034] In some aspects, the apparatus may include means for incrementing an MPE detection counter based at least in part on an average energy level radiated by the UE over a time period exceeding an MPE limit, wherein the MAC-CE is sent based at least in part on the MPE detection counter satisfying the threshold.

[0035] In some aspects, the method performed by the UE may include: triggering an MPE detection timer based at least in part on incrementing an MPE detection counter; stopping the MPE detection timer based at least in part on one or more of the following: the average energy level radiated by the UE fails to exceed the MPE limit in a subsequent time period, or the base station deactivates a cell in which the average energy level radiated by the UE exceeds the MPE limit; and resetting the MPE detection counter based at least in part on determining that a condition is met.

[0036] In some aspects, the UE may trigger an MPE detection timer based at least in part on incrementing an MPE detection counter; stop the MPE detection timer based at least in part on one or more of: the average energy level radiated by the UE fails to exceed the MPE limit in a subsequent time period, or the base station deactivates a cell in which the average energy level radiated by the UE exceeds the MPE limit; and reset the MPE detection counter based at least in part on determining that a condition is met.

[0037] In some aspects, one or more instructions also cause one or more processors of the UE to perform the following operations: trigger an MPE detection timer based at least in part on incrementing an MPE detection counter; stop the MPE detection timer based at least in part on one or more of the following: the average energy level radiated by the UE fails to exceed the MPE limit in a subsequent time period, or the base station deactivates a cell in which the average energy level radiated by the UE exceeds the MPE limit; and reset the MPE detection counter based at least in part on determining that a condition is met.

[0038] In some aspects, the apparatus may include: a unit for triggering an MPE detection timer based at least in part on incrementing an MPE detection counter; a unit for stopping the MPE detection timer based at least in part on one or more of: an average energy level radiated by the UE failing to exceed the MPE limit in a subsequent time period, or a base station deactivating a cell in which the average energy level radiated by the UE exceeds the MPE limit; and a unit for resetting the MPE detection counter based at least in part on determining that a condition is satisfied.

[0039] In some aspects, the condition includes one or more of: expiration of the MPE detection timer, failure of the average energy level radiated by the UE to exceed the MPE limit in a subsequent time period, deactivation of the cell in which the average energy level radiated by the UE exceeds the MPE limit by the base station, or reconfiguration of the MPE detection timer or the MPE detection counter by the base station.

[0040] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the accompanying drawings and description.

[0041] The foregoing has been fairly broadly outlined according to the features and technical advantages of the examples of the present disclosure, so that the subsequent specific embodiments can be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (both their organization and method of operation) and the associated advantages will be better understood according to the description below. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description, and is not intended to be a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description of the content briefly summarized above may be obtained by referring to various aspects (some of which are shown in the accompanying drawings). However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0043] Figure 1 is a diagram illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0044] Figure 2is a diagram illustrating an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

[0045] Figure 3 is a diagram illustrating an example of a UE adapting transmit power over a moving integration window to meet a maximum permitted exposure (MPE) limit in accordance with various aspects of the present disclosure.

[0046] Figures 4A-4H is a diagram illustrating one or more examples of signaling an MPE fallback indication in accordance with various aspects of the present disclosure.

[0047] Figure 5 is a diagram illustrating example processes performed, for example, by a UE, according to various aspects of the present disclosure.

[0048] Figure 6 is a conceptual data flow diagram illustrating the flow of data between different components in an example apparatus according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0049] The following is a more complete description of various aspects of the present disclosure with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. Specifically, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether the aspect is implemented independently of any other aspect of the disclosure or implemented in combination with any other aspect. For example, using any number of aspects set forth herein, a device can be implemented or a method can be implemented. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions other than the various aspects of the disclosure set forth herein or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0050] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0051] It should be noted that although terms commonly associated with 3G and / or 4G wireless technologies may be used herein to describe various aspects, various aspects of the present disclosure may be applied to communication systems based on other generations, such as 5G and later communication systems (including NR technology).

[0052] Figure 1 1 is a diagram showing a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network (e.g., a 5G or NR network). The wireless network 100 may include a plurality of BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0053] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). 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. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0054] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (e.g., direct physical connections, virtual networks, etc.) using any appropriate transport network.

[0055] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that is capable of relaying transmissions for other UEs. Figure 1 In the example shown in FIG. 1 , a relay station 110 d may communicate with a macro BS 110 a and a UE 120 d to facilitate communication between the BS 110 a and the UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0056] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0057] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0058] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), an entertainment device (e.g., a music or video device, or a satellite radio unit, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0059] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide a connection to or to a network (e.g., a wide area network such as the Internet or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (e.g., processor components, memory components, etc.).

[0060] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0061] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, vehicle-to-infrastructure (V2I) protocol, etc.), mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0062] As indicated above, Figure 1 is provided as an example. Other examples may differ from those described above. Figure 1 As described.

[0063] Figure 2 Base station 110 and UE 120 (which may be Figure 1 1. Block diagram of a design 200 for a base station in a base station and a UE in a UE. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0064] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, a synchronization signal may be generated using position coding to transmit additional information.

[0065] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information and system information to controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0066] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0067] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components in the base station 110 may perform one or more techniques associated with signaling a maximum allowed exposure (MPE) back-off indication, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in may perform or direct e.g. Figure 5 The operations of the process 500 and / or other processes as described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when the one or more instructions are executed by one or more processors of the base station 110 and / or the UE 120, the execution or guidance of the instructions may be performed, for example, Figure 5 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0068] In some aspects, UE 120 may include: means for determining an average energy level radiated by UE 120 over a time period; means for determining whether the average energy level radiated by UE 120 over the time period exceeds an MPE limit; means for sending a medium access control (MAC) control element (MAC-CE) to base station 110 based at least in part on the average energy level radiated by UE 120 over the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at UE 120 or an uplink duty cycle effective at UE 120; and the like. In some aspects, such means may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0069] As indicated above, Figure 2 is provided as an example. Other examples may differ from those described above. Figure 2 as described.

[0070] Figure 3 is a diagram illustrating an example 300 of a UE adapting transmit power within a moving integration window to meet a maximum permitted exposure (MPE) limit in accordance with various aspects of the present disclosure.

[0071] Since the UE may emit radio frequency (RF) waves, microwaves, and / or other radiation, the UE is generally subject to regulatory radio frequency safety requirements, which set forth specific guidelines or MPE limits that constrain various operations that the UE may perform. For example, when the UE is transmitting, the RF radiation may generally increase, and may further increase if the UE is performing frequent transmissions, high power transmissions, etc. Therefore, since frequent and / or high power transmissions may result in significant RF radiation, regulatory agencies (e.g., the Federal Communications Commission (FCC) in the United States) may provide information related to acceptable RF radiation exposure when the UE is communicating using different radio access technologies.

[0072] For example, when the UE is communicating using a radio access technology operating in a frequency range below 6 GHz, the applicable RF exposure parameter is the specific absorption rate (SAR), which refers to the rate at which energy is absorbed by a human body when exposed to RF energy (e.g., power absorbed per unit mass, which can be expressed in terms of watts / kilogram (W / kg)). In particular, SAR requirements typically specify that the total radiated power of the UE be kept below a certain level to limit the heating that may occur when absorbing RF energy. In another example, when the UE is communicating using a radio access technology operating in a high frequency range (such as a millimeter wave (mmW) frequency range), the applicable RF exposure parameter is power density, which can be adjusted to limit the heating of the UE and / or nearby surfaces.

[0073] Therefore, the UE must typically meet MPE limits, which are usually regulatory requirements defined in terms of total exposure averaged over a specific time period (e.g., a moving integration window). Figure 3 In the example and as indicated by reference numeral 310, if the UE is to transmit substantially continuously within a moving integration window comprising a time period of N seconds (eg, 100 seconds), the UE may be subject to an average power limitation (P limit ), below which the MPE limit will be met. Thus, as indicated by reference numeral 320, if the average energy level radiated by the UE within the moving integration window remains below the average power limit that meets the MPE limit, the UE may use an instantaneous transmit power that exceeds the average power limit for a period of time. For example, the UE may be allowed to transmit at a maximum transmit power at the beginning of the moving integration window, and the UE may subsequently reduce the instantaneous transmit power until the end of the moving integration window to ensure that the MPE limit on total exposure is met throughout the moving integration window. Typically, as indicated by reference numeral 330, the UE may reduce the instantaneous transmit power to a reserved power level (P reserve ), the reserved power level is the minimum transmit power level required to maintain a link with the base station.

[0074] Therefore, in order to meet the MPE limit, the UE may typically measure the average energy level radiated by the UE over a time period (e.g., a mobile integration window), and if the UE determines that the maximum transmit power needs to be reduced to meet the MPE limit, a power management maximum power reduction (P-MPR) may be applied to reduce the maximum transmit power that the UE can output. However, applying P-MPR to reduce the maximum transmit power that the UE can output may potentially result in degraded uplink performance. For example, since an uplink transmission by the UE may not have enough power to reach the base station, the power reduction may affect coverage for the UE or potentially cause a radio link failure or connection release. In addition, since the wireless network may not be configured to provide an explicit indication from the UE of a reduction in transmit power applied at the UE, the base station communicating with the UE may not know how much remaining energy budget is available to the UE within the mobile integration window and / or the extent to which the UE may have reduced the maximum transmit power. Therefore, the base station cannot take appropriate actions to adapt scheduling to help the UE maintain an uplink connection. These issues may arise even in the case where the UE signals a maximum uplink duty cycle, which is associated with the maximum percentage of symbols that can be scheduled for uplink transmission during a particular time period (e.g., one second) in order to ensure compliance with any applicable electromagnetic power density exposure requirements provided by regulatory agencies. In particular, because the MPE limit may be exceeded at different power levels, even if the base station adapts the scheduling for the UE according to the uplink duty cycle preference signaled by the UE, the UE may still need to apply P-MPR in extreme cases.

[0075] Some aspects described herein relate to techniques and apparatus for implementing signaling of an MPE fallback indication from a UE to a base station. For example, in some aspects, a UE may determine whether an average energy level radiated by the UE over a time period exceeds an MPE limit, and if the average energy level transmitted by the UE over the time period exceeds the MPE limit, the UE may apply a P-MPR to reduce the maximum transmit power, and / or reduce the uplink duty cycle to reduce the frequency at which the UE transmits in a given duration. In addition, in some aspects, the UE may send a medium access control (MAC) control element (MAC-CE) to a base station, the MAC-CE including information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE (e.g., periodically, when a triggering event occurs, etc.). In this manner, the MAC-CE may provide a base station with a dynamic indication of the P-MPR applied at the UE and / or a dynamic indication of the uplink duty cycle effective at the UE, which may enable the base station to adapt scheduling for the UE based at least in part on the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE. In this manner, the base station may schedule the UE more efficiently, which improves performance, saves network resources that may otherwise be wasted on reestablishing an uplink connection that may have been dropped due to the UE reducing the maximum uplink transmit power, and the like.

[0076] As indicated above, Figure 3 is provided as an example. Other examples may differ from those described above. Figure 3 As described.

[0077] Figures 4A-4H is a diagram illustrating one or more examples 400 of signaling an MPE fallback indication according to various aspects of the present disclosure. Figure 4A As shown in , example 400 includes a UE (e.g., UE 120) communicating with a base station (e.g., base station 110) in a wireless network (e.g., wireless network 100). In addition, as described herein, the UE can send a MAC-CE to the base station (e.g., at periodic intervals, when a triggering event occurs, etc.) to dynamically indicate one or more communication parameters related to MPE fallback applied at the UE. For example, as described in Figures 4B-4H As shown in , the MAC-CE may have a structure for dynamically indicating an actual P-MPR value applied at the UE and / or an uplink duty cycle effective at the UE (eg, to meet MPE limits).

[0078] As in Figure 4AIn and as shown by reference numeral 410, the UE may determine whether an average energy level radiated by the UE over a time period exceeds an MPE limit. For example, as described above, the UE may measure or otherwise determine an average energy level radiated by the UE over a moving integration window covering a specific duration to determine whether the average energy level radiated by the UE over the moving integration window meets (e.g., is less than or equal to) an MPE limit or exceeds an MPE limit that defines acceptable RF radiation exposure when the UE performs a transmission operation. In some aspects, to determine whether the average energy level radiated by the UE meets or exceeds the MPE limit, the UE may utilize an MPE detection algorithm based at least in part on an MPE detection counter and an MPE detection timer. For example, in the event that the UE detects an MPE problem (e.g., based at least in part on an average energy level radiated by the UE over a specific time period exceeding an MPE limit), the UE may increment an MPE detection counter and trigger (e.g., start or restart) an MPE detection timer. In addition, if the MPE problem is successfully resolved (e.g., the average energy level radiated by the UE within the current integration window does not exceed the MPE limit), or the base station deactivates the cell in which the MPE problem is detected, the UE may stop (e.g., pause) the MPE detection timer. Thus, if the MPE detection counter reaches a maximum value, the UE may trigger an MPE fallback reporting process to indicate a P-MPR value and / or a dynamic uplink duty cycle applied by the UE to ensure compliance with the MPE limit. Additionally or alternatively, if the MPE reset condition is met, the UE may reset the MPE detection counter to zero. For example, in some aspects, the MPE reset condition may be met if the MPE detection timer expires, the MPE problem is successfully resolved by the average energy level radiated by the UE in a subsequent time period not exceeding the MPE limit, the base station deactivates the cell in which the average energy level radiated by the UE exceeds the MPE limit, the base station reconfigures the MPE detection timer and / or the MPE detection counter, and the like.

[0079] As in Figure 4AIn and as further shown by reference numeral 412, the UE may determine a P-MPR value and / or an uplink duty cycle to be applied for each cell configured for the UE in order to meet the MPE limit. For example, in the event that the UE does not detect an MPE problem (e.g., the average radiated power in the current time period does not exceed the MPE limit), the P-MPR applied at the UE may have a zero value (e.g., no P-MPR is applied at the UE), the uplink duty cycle effective at the UE may be configured based at least in part on the maximum uplink duty cycle supported by the UE, etc. Alternatively, in the event that the UE detects an MPE problem, the P-MPR applied at the UE may have a non-zero value, the uplink duty cycle effective at the UE may be reduced, etc., in order to reduce the total radiated power to a level that meets the MPE limit.

[0080] As in Figure 4A 4 and further indicated by reference numeral 414, the UE may send a MAC-CE to the base station to report information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE. For example, in some aspects, the MAC-CE may be sent on a per-cell basis to report the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE, as the MPE problem may vary between cells (e.g., as described below with reference to Figures 4B-4H In addition, as described in more detail in Figure 4A As shown in , the UE may send a MAC-CE based at least in part on determining that a P-MPR reporting condition is met to report information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE. For example, in some aspects, the UE may send a MAC-CE when the MPE detection counter meets a threshold (e.g., reaches a maximum value).

[0081] Additionally or alternatively, the UE may periodically send a MAC-CE to report information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE. For example, the UE may be configured to periodically report the current P-MPR applied at the UE and / or the current uplink duty cycle effective at the UE according to a periodic interval configured by the base station, and the periodic interval may have a different value or the same value as the traditional phr-PeriodicTimer parameter, which defines the interval for the UE to report the power headroom. Additionally or alternatively, the periodic interval may be defined as an applicability period associated with the current uplink duty cycle effective at the UE. For example, the uplink duty cycle may generally define the on and off periods during which the UE performs and does not perform uplink transmissions, whereby the UE may send a MAC-CE only during the on period during which the UE performs uplink transmissions to report information related to the current P-MPR and / or the uplink duty cycle. In this way, the period of MAC-CE for reporting information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE can inform the base station of the applicability period associated with the current uplink duty cycle at the UE.

[0082] Additionally or alternatively, the UE may send a MAC-CE to report information related to the P-MPR applied at the UE and / or the uplink duty cycle effective at the UE based at least in part on one or more triggering events. For example, in some aspects, the UE may send a MAC-CE when the P-MPR has a value that satisfies (e.g., is equal to or exceeds) a threshold, when the difference between the current value of the P-MPR applied at the UE and the previous value of the P-MPR applied at the UE satisfies (e.g., is higher than or lower than) a threshold, when the base station triggers a single report of the current P-MPR value and / or uplink duty cycle from one or more cells (e.g., via downlink control information of a scheduling report), and the like.

[0083] In addition, in some aspects, the UE may send a MAC-CE based at least in part on determining that a prohibit timer (e.g., a hysteresis timer) has expired. For example, in some aspects, the prohibit timer may have a duration configured by the base station to prevent the UE from over-reporting the current P-MPR and / or uplink duty cycle (e.g., reducing network overhead). Therefore, when the UE sends a MAC-CE to report the current P-MPR applied at the UE and / or the current uplink duty cycle valid at the UE, the prohibit timer may be started, and the UE may avoid sending any additional MAC-CEs to report the current P-MPR applied at the UE and / or the current uplink duty cycle valid at the UE when the prohibit timer has not expired. In addition, after the prohibit timer expires, the UE may send periodic and / or event-triggered MAC-CEs to report the current P-MPR applied at the UE and / or the current uplink duty cycle valid at the UE.

[0084] In some aspects, in order to send a MAC-CE including information related to a current P-MPR applied at the UE and / or a current uplink duty cycle effective at the UE, the UE may typically need to have an uplink grant that schedules or otherwise allows uplink transmissions by the UE. In addition, since the current P-MPR applied at the UE and / or the current uplink duty cycle effective at the UE may involve delay-sensitive MPE issues that need to be met in order to comply with regulatory requirements, the UE may be configured to use an immediately available uplink grant and / or immediately initiate a process for obtaining an uplink grant when P-MPR and / or uplink duty cycle reporting conditions are met.

[0085] For example, in the case where the UE has an available uplink grant, the UE may use the available uplink grant without any additional signaling to send a MAC-CE including information related to the current P-MPR applied at the UE and / or the current uplink duty cycle effective at the UE. For example, in some aspects, the available uplink grant may be a pre-scheduled uplink grant (e.g., a grant of type 1 or type 2 configuration), a dynamic grant received via a physical downlink control channel (PDCCH), an uplink grant provided in a random access response (RAR) message associated with a two-step or four-step random access channel (RACH) procedure, etc. Otherwise, in the case where the UE does not have an available uplink grant, the UE may send a request for an uplink grant to the base station in order to send a MAC-CE, instead of passively waiting for an uplink grant, the MAC-CE including information related to the current P-MPR applied at the UE and / or the current uplink duty cycle effective at the UE. In particular, the request may typically notify the base station that a P-MPR and / or uplink duty cycle reporting event has occurred and that the UE requires an uplink grant to send a MAC-CE to provide the base station with information related to the P-MPR and / or uplink duty cycle at the UE. For example, in some aspects, the request may be a shared scheduling request sent using a physical uplink control channel (PUCCH) resource configured for the UE, a dedicated scheduling request configured by the base station, etc., or the request may be sent by initiating a two-step or four-step RACH process (e.g., if PUCCH resources and / or scheduling request resources are not configured for the UE). For example, as described above, a RAR message associated with a RACH process (e.g., msgB in a two-step RACH process or msg2 in a four-step RACH process) typically includes an uplink grant, whereby the UE may send the UE in an uplink message associated with the RACH process (e.g., msgA payload in a two-step RACH process, Msg3 in a four-step RACH process, etc.).

[0086] Therefore, based on the P-MPR value applied at the UE (if any) and / or the current uplink duty cycle effective at the UE, the MAC-CE sent by the UE may generally indicate information related to the current energy budget at the UE, which may enable the base station to mitigate the MPE problem experienced at the UE. For example, in some aspects, the base station may avoid scheduling uplink transmissions in one or more cells in which the UE is experiencing MPE problems, may schedule the UE to transmit less frequently, may modify the uplink grant to reduce the uplink transmit power to be used by the UE (for example, by scheduling a narrower uplink bandwidth or a lower modulation order), and so on. Generally, in order to enable the base station to perform more efficient scheduling and / or MPE mitigation, the MAC-CE may include: information indicating whether P-MPR is applied at the UE, the value of the P-MPR applied at the UE (if any), the current uplink duty cycle effective at the UE, and the like. Therefore. As described below with reference to Figures 4B-4H As described in more detail, the MAC-CE may be configured in various ways to convey the information needed to enable a base station to perform more efficient scheduling and / or MPE mitigation.

[0087] For example, as in Figure 4B In the example and as indicated by reference numeral 420, the UE may configure the MAC-CE as a power headroom (PHR) MAC-CE, the PHR MAC-CE including a one-bit field for indicating whether P-MPR is applied at the UE on a per-cell basis. Figure 4B As shown, the PHR MAC-CE may include a maximum configured power (P cmax ), a single entry PHR MAC-CE that may be used when there are less than eight serving cells with uplinks configured for the UE, or a multiple entry PHR MAC-CE that may be used when there are eight or more (up to thirty-two) serving cells with uplinks configured for the UE. Figure 4B As shown in , the single-entry PHR MAC-CE and multi-entry PHR MAC-CE formats may be configured to include indicator bits (e.g., Figure 4B), the indicator bit may indicate whether the UE has applied P-MPR on a per-cell basis. For example, the PHR MAC-CE format each includes one or more power headroom entries corresponding to the corresponding serving cell, and each power headroom entry may include a separate bit for indicating whether the UE has applied P-MPR to the corresponding serving cell. For example, the separate bit may be set to a first value (e.g., one) to indicate that the UE has applied a non-zero P-MPR to the corresponding serving cell, or the separate bit may be set to a second value (e.g., zero) to indicate that the P-MPR for the corresponding serving cell has a zero value (e.g., P-MPR is not applied for the corresponding serving cell). Thus, the separate bit may be set to a first value to indicate that the UE is experiencing an MPE problem in the corresponding serving cell, or to a second value to indicate that the UE is not experiencing an MPE problem in the corresponding serving cell. In addition, as shown, in the case of a single-entry PHR MAC-CE, the separate indicator bit may correspond to the first bit in the first octet.

[0088] Additionally or alternatively, such as Figure 4C As shown in Figure 4B The PHR MAC-CE format shown in can be extended to transmit additional information related to the P-MPR value applied at the UE on a per-cell basis. For example, as shown by reference numeral 422, the extended PHR MAC-CE may include a two-bit P-MPR field for indicating the actual P-MPR value or P-MPR state for each cell. In this case, the two reserved (R) bits in each power headroom entry can be used as a two-bit P-MPR field, which can represent four possible values ​​of the P-MPR applied for each cell at the UE. In addition or alternatively, the four possible values ​​of the two-bit P-MPR field can each correspond to a P-MPR state that groups multiple P-MPR values. For example, eight P-MPR values ​​can be grouped into four states, each state including two P-MPR values, and the two-bit P-MPR field can represent one of the four states. Additionally or alternatively, one possible value of the P-MPR field (e.g., "00") may be used to indicate that the UE has not yet applied P-MPR (or has applied P-MPR with a zero or null value) to the corresponding cell, and the other three values ​​of the P-MPR field may represent an actual P-MPR value or a P-MPR state including multiple P-MPR values.

[0089] Additionally or alternatively, such as Figure 4D As shown in Figure 4B-4CThe PHR MAC-CE format shown in FIG. 4 may be further extended to convey information related to the current uplink duty cycle applied at the UE on a per-cell basis. For example, as shown by reference numeral 424, the extended PHR MAC-CE may include information for indicating the actual P-MPR value or P-MPR state for each cell (e.g., in the same format as Figure 4C The two-bit P-MPR field of the extended PHR MAC-CE may include an additional field for indicating the current uplink duty cycle effective at the UE for each cell. Figure 4D As shown in FIG. 1 , the field for the current uplink duty cycle may be in the P-MPR field and the P-MPR field for the corresponding cell. cmax In this way, when Figure 4D When the PHR MAC-CE is configured as shown in , the PHR MAC-CE can be used to simultaneously transmit the actual P-MPR value and the current uplink duty cycle for each cell, and thus efficiently report all relevant power information to the base station in a single MAC-CE transmission.

[0090] Additionally or alternatively, such as Figure 4E As shown in Figures 4B-4D The illustrated PHR MAC-CE format may be further extended to include separate P-MPR and uplink duty cycle fields and separate indication bits for indicating whether corresponding values ​​are reported in the P-MPR and / or uplink duty cycle fields. For example, as indicated by reference numeral 426, the extended PHR MAC-CE format may include a P-MPR field for the corresponding cell. cmax The P-MPR field and the uplink duty cycle field are included in a single octet following the octet of the value. Figure 4E As shown in FIG. , it includes P for the corresponding cell cmaxThe eight-bit byte of the value includes two indication bits, which can indicate whether the corresponding values ​​are reported in the P-MPR and / or uplink duty cycle fields. For example, the indication bits may include a C bit, which is set to zero (0) to indicate that the UE is not applying P-MPR to the corresponding cell, or is set to one (1) to indicate that the UE is applying P-MPR to the corresponding cell, so that the P-MPR field includes the actual P-MPR value applied at the UE for the corresponding cell. In a similar aspect, the indication bits may include a U bit, which is set to zero to indicate that the UE is not reporting an uplink duty cycle for the corresponding cell, or is set to one to indicate that the UE is reporting an uplink duty cycle effective for the corresponding cell in the uplink duty cycle field. In this way, the PHR MAC-CE may include actual P-MPR values ​​and / or uplink duty cycles for one or more cells, and the UE may avoid including actual P-MPR values ​​and / or uplink duty cycles for one or more other cells in the PHR MAC-CE (e.g., based at least in part on configuration information received from a base station indicating whether to report actual P-MPR values ​​and / or uplink duty cycles for one or more cells).

[0091] In some aspects, such as Figure 4F-4G As shown in , the MAC-CE for reporting information related to the P-MPR applied at the UE and / or the current uplink duty cycle effective at the UE can be formatted as a MAC-CE dedicated to P-MPR reporting. Figure 4F In the embodiment and as shown by reference numeral 430, the dedicated P-MPR MAC-CE may include a one-byte bitmap indicating one or more (up to 8) serving cell identifiers, and each eight-bit byte following the bitmap may include a four-bit P-MPR field and a four-bit uplink duty cycle field to represent up to sixteen different values ​​for the P-MPR value and the uplink duty cycle for the corresponding serving cell. Alternatively, as shown by reference numeral 432, the dedicated P-MPR MAC-CE may include a four-byte bitmap indicating one or more serving cell identifiers, and the dedicated P-MPR MAC-CE may also include a separate eight-bit field to represent up to 2 different values ​​for the P-MPR value and the uplink duty cycle for each serving cell. 8 different values. Alternatively, as in Figure 4G In the embodiment and as indicated by reference numeral 434, the dedicated P-MPR MAC-CE may include one or more explicit serving cell identifiers and separate P-MPR and uplink duty cycle fields for each serving cell identifier. For example, the separate P-MPR and uplink duty cycle fields may be eight-bit fields (e.g., in separate octets, such as Figure 4G), a separate four-bit field in the same octet, etc.

[0092] Additionally or alternatively, as in Figure 4H In the embodiment and as indicated by reference numeral 440, the UE may configure a beam failure recovery (BFR) MAC-CE to report information related to the MPE fallback indication. Figure 4H As shown in , the BFR MAC-CE may include a one-byte bitmap or a four-byte bitmap to identify one or more serving cells for which the UE is reporting information via the BFR MAC-CE. In addition, the BFR MAC-CE may include one or more BFR entries, each of which includes an indication bit pair and an information field, and the information field may include a candidate reference signal identifier, a P-MPR value, or an uplink duty cycle value for the corresponding serving cell, depending on the state of the indication bit pair. For example, in the case where the first (e.g., "AC") indication bit is set to a first value (e.g., one), the information field may include a candidate reference signal identifier with the best beam measurement (e.g., the highest reference signal received power), so that the base station can use the information in the BFR MAC-CE to implement beam failure recovery for the UE. Alternatively, in the case where the first indication bit is set to a second value (e.g., zero), the information field may include a P-MPR value or an uplink duty cycle value for the corresponding serving cell, depending on the value of the second (e.g., "C") indication bit. For example, if the second indication bit is set to the first value, the information field may include the P-MPR value, or if the second indication bit is set to the second value, the information field may include the uplink duty cycle value. In this way, the UE can flexibly use the BFR MAC-CE to report the P-MPR value and / or uplink duty cycle value for one or more serving cells with relatively small overhead (e.g., one byte per serving cell).

[0093] As indicated above, Figures 4A-4H is provided as one or more examples. Other examples may differ from Figures 4A-4H As described.

[0094] Figure 5 is a diagram illustrating an example process 500, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 500 is an example in which a UE (eg, UE 120, etc.) performs operations associated with signaling an MPE fallback indication.

[0095] like Figure 5As shown in , in some aspects, process 500 may include: determining an average energy level radiated by the UE over a period of time (block 510). For example, the UE may determine (e.g., using controller / processor 280, memory 282, etc.) an average energy level radiated by the UE over a period of time, as described above.

[0096] like Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include determining whether an average energy level radiated by the UE during the time period exceeds an MPE limit (block 520). For example, the UE may determine (e.g., using controller / processor 280, memory 282, etc.) whether an average energy level radiated by the UE during the time period exceeds an MPE limit, as described above.

[0097] like Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include: sending a MAC-CE to a base station based at least in part on an average energy level radiated by the UE during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a P-MPR applied at the UE or an uplink duty cycle effective at the UE (block 530). For example, the UE may send (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, memory 282, etc.) a MAC-CE to a base station based at least in part on an average energy level radiated by the UE during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a P-MPR applied at the UE or an uplink duty cycle effective at the UE, as described above.

[0098] Process 500 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0099] In a first aspect, a MAC-CE comprises at least one power headroom entry having a separate bit for indicating whether a P-MPR applied at the UE has a zero value or a non-zero value for a corresponding cell.

[0100] In a second aspect, alone or in combination with the first aspect, the single bit corresponds to the first bit in the first octet of the MAC-CE.

[0101] In a third aspect, alone or in combination with one or more of the first and second aspects, the MAC-CE includes at least one power headroom entry, the at least one power headroom entry including two bits for indicating values ​​or states representing multiple possible values ​​associated with the P-MPR applied at the UE for the corresponding cell.

[0102] In a fourth aspect, alone or in combination with one or more of the first to third aspects, two bits are set to a predefined value to indicate that the P-MPR applied at the UE has a value of zero.

[0103] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, at least one power headroom entry further comprises a field for indicating an uplink duty cycle effective at the UE.

[0104] In the sixth aspect, alone or in combination with one or more aspects of the first to fifth aspects, the MAC-CE includes at least one power headroom entry, and the at least one power headroom entry includes: a first bit for indicating whether the MAC-CE includes a field for indicating the value of the P-MPR applied at the UE for the corresponding cell, and a second bit for indicating whether the MAC-CE includes a field for indicating the uplink duty cycle valid at the UE for the corresponding cell.

[0105] In the seventh aspect, alone or in combination with one or more aspects of the first to sixth aspects, the MAC-CE includes one or more cell identifiers and one or more P-MPR entries, each P-MPR entry including: a first field for indicating the value of the P-MPR applied at the UE for the corresponding cell, and a second field for indicating the uplink duty cycle effective at the UE for the corresponding cell.

[0106] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the MAC-CE includes a bitmap for indicating one or more cell identifiers corresponding to one or more P-MPR entries.

[0107] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the MAC-CE explicitly indicates one or more cell identifiers corresponding to the one or more P-MPR entries.

[0108] In the tenth aspect, alone or in combination with one or more aspects from the first to the ninth aspects, the MAC-CE includes at least one beam failure recovery entry, and the at least one beam failure recovery entry includes a field for indicating the value of the P-MPR applied at the UE or the uplink duty cycle effective at the UE for the corresponding cell.

[0109] In the eleventh aspect, alone or in combination with one or more aspects of the first to tenth aspects, at least one beam failure recovery entry also includes a bit having: a first value for indicating a field indicating a value of a P-MPR applied at the UE, or a second value for indicating a field indicating an uplink duty cycle effective for a corresponding cell at the UE.

[0110] In the twelfth aspect, alone or in combination with one or more aspects of the first to eleventh aspects, a MAC-CE is sent according to a periodic P-MPR reporting interval configured by the base station to periodically report information related to the P-MPR applied at the UE or the uplink duty cycle effective at the UE.

[0111] In the thirteenth aspect, alone or in combination with one or more aspects of the first to twelfth aspects, a MAC-CE is sent to a base station according to a P-MPR reporting interval to periodically report information related to the P-MPR applied at the UE or the uplink duty cycle effective at the UE, and the P-MPR reporting interval is at least partially based on the uplink duty cycle effective at the UE.

[0112] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the MAC-CE is sent based at least in part on one or more of the following: a current value of the P-MPR applied at the UE satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the UE satisfies a threshold, or information received from the base station triggers a report of the P-MPR applied at the UE.

[0113] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the MAC-CE is sent based at least in part on the expiration of a P-MPR prohibit timer configured by the base station.

[0114] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, process 500 includes: sending a request for an uplink grant to a base station based at least in part on determining that the UE does not have an available uplink grant, wherein the request indicates that a P-MPR reporting event has occurred at the UE; and receiving an uplink grant, wherein the MAC-CE is sent using the uplink grant.

[0115] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the request for uplink grant is sent using one or more of PUCCH resources or RACH procedures.

[0116] In the eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the MAC-CE is sent using one or more of: a pre-scheduled uplink grant, a dynamic uplink grant, or an uplink grant associated with a RAR message received from a base station.

[0117] In the nineteenth aspect, alone or in combination with one or more aspects of the first to eighteenth aspects, process 500 includes: incrementing an MPE detection counter based at least in part on an average energy level radiated by the UE over a time period exceeding an MPE limit, wherein the MAC-CE is sent based at least in part on the MPE detection counter satisfying a threshold.

[0118] In the twentieth aspect, alone or in combination with one or more of aspects one to nineteen, process 500 includes: triggering an MPE detection timer based at least in part on incrementing an MPE detection counter; stopping the MPE detection timer based at least in part on one or more of the following: the average energy level radiated by the UE fails to exceed the MPE limit in a subsequent time period, or the base station deactivates a cell in which the average energy level radiated by the UE exceeds the MPE limit; and resetting the MPE detection counter based at least in part on determining that a condition is met.

[0119] In aspect 21, alone or in combination with one or more of aspects 1 to 20, the conditions include one or more of the following: expiration of the MPE detection timer, failure of the average energy level radiated by the UE to exceed the MPE limit in a subsequent time period, deactivation of the cell in which the average energy level radiated by the UE exceeds the MPE limit by the base station, or reconfiguration of the MPE detection timer or the MPE detection counter by the base station.

[0120] Although Figure 5 Example blocks of process 500 are shown, but in some aspects, process 500 may include Figure 5 The blocks depicted in the process 500 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 500. Additionally or alternatively, two or more blocks in the blocks of process 500 may be executed in parallel.

[0121] Figure 6 6 is a conceptual data flow diagram 600 illustrating the flow of data between different components in an example apparatus 602. The apparatus 602 may be a UE (e.g., UE 120). In some aspects, the apparatus 602 includes a receiving component 604, an MPE detecting component 606, a sending component 608, etc. Figure 6 As shown, the device 602 can use the receiving component 604 and / or the sending component 608 to communicate with another device 650 (e.g., a base station).

[0122] The receiving component 604 can receive one or more downlink communications from the device 650. For example, the receiving component 604 can receive a RAR message, a radio resource control (RRC) signal, a downlink control information (DCI), and / or other suitable downlink information from the device 650, and the device 650 can configure an uplink grant for the device 602. Additionally or alternatively, the receiving component 603 can receive from the device 650: information related to one or more scheduled uplink transmissions for the device 602, a configuration for reporting a P-MPR and / or an uplink duty cycle for one or more cells (e.g., information triggering a single report of a P-MPR and / or an uplink duty cycle for one or more cells, information configuring one or more prohibition timers for P-MPR and / or uplink duty cycle reporting, etc.). In some aspects, the receiving component 604 can include an antenna (e.g., the antenna 252), a receiving processor (e.g., the receiving processor 258), a controller / processor (e.g., the controller / processor 280), a transceiver, a receiver, etc.

[0123] The MPE detection component 606 can detect one or more MPE problems that may occur when the device 602 is transmitting information (e.g., on an uplink). For example, the MPE detection component 606 can determine an average energy level radiated by the device 602 over a period of time, can determine whether the average energy level radiated by the device 602 over the period of time exceeds an MPE limit, etc. In some aspects, the MPE detection component 606 can include a processor (e.g., the transmit processor 264, the receive processor 258, the controller / processor 280, etc.).

[0124] The transmitting component 608 may transmit one or more uplink communications to the apparatus 650. For example, the transmitting component 608 may transmit a MAC-CE to the apparatus 650, the MAC-CE including information related to the P-MPR applied for one or more cells at the apparatus 602, the uplink duty cycle effective for the one or more cells at the apparatus 602, etc. In some aspects, the transmitting component 608 may include an antenna (e.g., antenna 252), a transmit processor (e.g., transmit processor 264), a controller / processor (e.g., controller / processor 280), a transceiver, a transmitter, etc.

[0125] The apparatus may include performing the above Figure 5 Each block of the algorithm in the process 500 and the like may be additionally configured as a component. Figure 5Each block in the process 500, etc. of the embodiment of the present invention may be included in the process 500, and the device may include one or more of those components. The component may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium to be implemented by a processor, or some combination thereof.

[0126] exist Figure 6 The number and arrangement of components shown in the figure are provided as examples. Figure 6 There may be additional components, fewer components, different components, or components arranged in a different manner than those components shown in FIG. Figure 6 Two or more components shown in may be implemented in a single component, or in Figure 6 A single component shown in may be implemented as multiple distributed components. Additionally or alternatively, Figure 6 A set of components (e.g., one or more components) shown in can perform the operations described in Figure 6 One or more functions performed by another set of components shown in FIG.

[0127] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the various aspects.

[0128] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0129] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0130] It will be apparent that the systems and / or methods described herein may be implemented with various forms of hardware, firmware, and / or combinations of hardware and software. The actual specialized control hardware or software code used to implement these systems and / or methods is not a limitation of the various aspects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, it being understood that software and hardware may be designed to implement the systems and / or methods based, at least in part, on the description herein.

[0131] Even if the specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically recorded in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below can only directly depend on one claim, the disclosure of various aspects includes the combination of each dependent claim with each other claim in the claim set. The phrase "at least one of" referring to the list of items refers to any combination of those items, including a single member. For example, "at least one of a, b or c" is intended to cover any combination of a, b, c, ab, ac, bc and abc, and with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other ordering of a, b and c).

[0132] Elements, actions or instructions used herein should not be interpreted as being critical or necessary unless clearly described as such. In addition, as used herein, the articles "a" and "an" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more projects (e.g., related projects, unrelated projects, combinations of related projects and unrelated projects, etc.), and can be used interchangeably with "one or more". In the case of only expecting one project, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "containing", etc. are intended to be open terms. In addition, unless otherwise expressly stated, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: determining an average energy level radiated by the UE over a period of time; determining whether the average energy level radiated by the UE during the time period exceeds a maximum permissible exposure (MPE) limit; as well as A medium access control (MAC) control element (MAC-CE) is sent to a base station based at least in part on the average energy level radiated by the UE during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at the UE or an uplink duty cycle effective at the UE.

2. The method according to claim 1, wherein: The MAC-CE includes at least one power headroom entry including two bits for indicating values ​​or states representing a plurality of possible values ​​associated with the P-MPR applied at the UE for the corresponding cell.

3. The method according to claim 1, wherein: The MAC-CE is sent based at least in part on one or more of: a current value of the P-MPR applied at the UE satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the UE satisfies a threshold, or information received from the base station triggers reporting of the P-MPR applied at the UE.

4. The method according to claim 1, wherein: The MAC-CE is sent based at least in part on expiration of a P-MPR prohibit timer configured by the base station.

5. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the memory and the one or more processors being configured to: determining an average energy level radiated by the UE over a period of time; determining whether the average energy level radiated by the UE during the time period exceeds a maximum permissible exposure (MPE) limit; as well as A medium access control (MAC) control element (MAC-CE) is sent to a base station based at least in part on the average energy level radiated by the UE during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at the UE or an uplink duty cycle effective at the UE.

6. The UE according to claim 5, wherein: The MAC-CE includes at least one power headroom entry including two bits for indicating values ​​or states representing a plurality of possible values ​​associated with the P-MPR applied at the UE for the corresponding cell.

7. The UE according to claim 5, wherein: The MAC-CE is sent based at least in part on one or more of: a current value of the P-MPR applied at the UE satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the UE satisfies a threshold, or information received from the base station triggers reporting of the P-MPR applied at the UE.

8. The UE according to claim 5, wherein: The MAC-CE is sent based at least in part on expiration of a P-MPR prohibit timer configured by the base station.

9. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: determining an average energy level radiated by the UE over a period of time; determining whether the average energy level radiated by the UE during the time period exceeds a maximum permissible exposure (MPE) limit; as well as A medium access control (MAC) control element (MAC-CE) is sent to a base station based at least in part on the average energy level radiated by the UE during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at the UE or an uplink duty cycle effective at the UE.

10. The non-transitory computer readable medium of claim 9, wherein: The MAC-CE includes at least one power headroom entry including two bits for indicating values ​​or states representing a plurality of possible values ​​associated with the P-MPR applied at the UE for the corresponding cell.

11. The non-transitory computer readable medium of claim 9, wherein: The MAC-CE is sent based at least in part on one or more of: a current value of the P-MPR applied at the UE satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the UE satisfies a threshold, or information received from the base station triggers reporting of the P-MPR applied at the UE.

12. The non-transitory computer readable medium of claim 9, wherein: The MAC-CE is sent based at least in part on expiration of a P-MPR prohibit timer configured by the base station.

13. An apparatus for wireless communication, comprising: means for determining an average energy level radiated by the device over a period of time; means for determining whether said average energy level radiated by said device during said time period exceeds a maximum permissible exposure (MPE) limit; as well as A unit for sending a medium access control (MAC) control element (MAC-CE) to a base station based at least in part on the average energy level radiated by the device during the time period exceeding the MPE limit, the MAC-CE including information related to one or more of a power management maximum power reduction (P-MPR) applied at the device or an uplink duty cycle effective at the device.

14. The device according to claim 13, wherein: The MAC-CE includes at least one power headroom entry including two bits for indicating values ​​or states representing a plurality of possible values ​​associated with the P-MPR applied at the apparatus for the corresponding cell.

15. The device according to claim 13, wherein: The MAC-CE is sent based at least in part on one or more of: a current value of the P-MPR applied at the device satisfies a threshold, a difference between the current value and a previous value of the P-MPR applied at the device satisfies a threshold, or information received from the base station triggers reporting of the P-MPR applied at the device.

16. The device according to claim 13, wherein: The MAC-CE is sent based at least in part on expiration of a P-MPR prohibit timer configured by the base station.

Images