Reporting on maximum permissible exposure

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may: determine that a maximum permitted exposure (MPE) condition is satisfied for the UE; transmit a message to a base station based at least in part on determining that the MPE condition is satisfied; and transmit beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is the 371st national phase of Patent Cooperation Treaty (PCT) Application No. PCT / CN2020 / 074689, entitled “REPORTING FOR MAXIMUM PERMISSIBLE EXPOSURE”, filed on February 11, 2020, which is expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for reporting on maximum permissible exposure (MPE).

[0005] background

[0006] 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 promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BS) that can support communication of several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by 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 known 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 to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) may include: determining that a maximum permitted exposure (MPE) condition is satisfied for the UE; transmitting a message to a base station based at least in part on determining that the MPE condition is satisfied; and transmitting beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE.

[0011] In some aspects, a wireless communication method performed by a base station may include: receiving a message from a UE indicating that an MPE condition of the UE is satisfied; receiving beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; and communicating with the UE based at least in part on the updated transmit beam.

[0012] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine that an MPE condition is satisfied for the UE; transmit a message to a base station based at least in part on determining that the MPE condition is satisfied; and transmit beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE.

[0013] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive a message from a UE indicating that an MPE condition of the UE is satisfied; receive beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; and communicate with the UE based at least in part on the updated transmit beam.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: determine that an MPE condition is satisfied for the UE; transmit a message to a base station based at least in part on determining that the MPE condition is satisfied; and transmit beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: receive a message from a UE indicating that an MPE condition of the UE is satisfied; receive beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; and communicate with the UE based at least in part on the updated transmit beam.

[0016] In some aspects, a device for wireless communication may include: a device for determining that an MPE condition is satisfied for the device; a device for transmitting a message to a base station based at least in part on determining that the MPE condition is satisfied; and a device for transmitting beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the device.

[0017] In some aspects, an apparatus for wireless communication may include: a device for receiving a message from a UE, the message indicating that an MPE condition of the UE is satisfied; a device for receiving beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; and a device for communicating with the UE based at least in part on the updated transmit beam.

[0018] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying figures.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0023] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0024] Figure 3 is a diagram illustrating an example of a first procedure for indicating that an MPE condition is satisfied according to various aspects of the present disclosure.

[0025] Figure 4 is a diagram illustrating an example of a second procedure for indicating that an MPE condition is satisfied according to various aspects of the present disclosure.

[0026] Figure 5 is a diagram illustrating an example process, performed, for example, by user equipment, in accordance with various aspects of the present disclosure.

[0027] Figure 6 is a diagram illustrating example processes performed, for example, by a base station in accordance with various aspects of the present disclosure.

[0028] Detailed Description

[0029] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can 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 supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0030] 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.

[0031] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0032] Figure 1 1 is a diagram illustrating 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, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 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, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a particular 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.

[0033] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, 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 subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. 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. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0034] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0035] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0036] 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).

[0037] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0038] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), 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.

[0039] Some UEs may be considered as machine type communication (MTC) UEs, 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 connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via 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 client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0040] In general, 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 radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may 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 may be deployed.

[0041] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, 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.

[0042] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described herein. Figure 1 Examples described.

[0043] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 One for each base station and one for each UE in the base station 110. 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.

[0044] 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 each UE based at least in part on the MCS selected for the 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, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective 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. The 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, position coding may be used to generate synchronization signals to convey additional information.

[0045] 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. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a 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.

[0046] 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 as well as 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 sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and 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.

[0047] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 5 The process of 500 Figure 6 600, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 5 The process of 500 Figure 6 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0048] In some aspects, UE 120 may include: means for determining that an MPE condition is satisfied for UE 120; means for transmitting a message to a base station based at least in part on determining that the MPE condition is satisfied; means for transmitting beam information to the base station based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; means for selecting an updated transmit beam from a set of transmit beams that do not exceed the MPE condition; means for selecting a beam on which to transmit the message, wherein the beam is different from a beam associated with satisfying the MPE condition for the UE; means for receiving a response associated with the message; and the like. In some aspects, such means may include in conjunction with 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, and the like.

[0049] In some aspects, base station 110 may include: means for receiving a message from a UE indicating that an MPE condition of the UE is satisfied; means for receiving beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE; means for communicating with the UE based at least in part on the updated transmit beam; means for transmitting a response associated with the message; and the like. In some aspects, such means may include in conjunction with Figure 2One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0050] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0051] Regulatory or other guidelines may impose maximum permissible exposure (MPE) limits on devices (such as UEs) transmitting wireless signals. For example, a UE may be associated with a threshold that defines an intensity limit for a radio frequency (RF) field or radiation toward the user. When a UE is subject to an MPE condition, a downlink beam may be suitable for use by the UE for communication with a base station, but a corresponding uplink beam in the same reciprocal beam pair may not be permitted for use due to the MPE condition. In such a situation, the UE may move to an updated uplink beam that does not meet the MPE condition to continue communicating with the base station.

[0052] However, certain beam reselection methods, such as contention-based physical random access (CB-PRACH), contention-free PRACH for beam failure recovery, and indication of updated uplink beams on configured resources, may be unreliable and may negatively impact downlink beam performance and latency. For example, CB-PRACH may have a greater impact on downlink beams and may increase latency. As another example, CF-BFR-PRACH may have a greater impact on downlink beams, increase latency, and may only be applicable to the primary cell (PCell) of the UE. As yet another example, signaling methods on configured resources, such as configured resources of a secondary cell (SCell), may rely on the availability of a configured beam for a physical uplink control channel or a physical uplink shared channel, which may not be consistently available. As a result, these methods may reduce throughput on the downlink, increase latency, and be unreliable.

[0053] Some techniques and apparatus described herein provide for signaling by a UE that an MPE condition is met while reducing (e.g., minimizing, eliminating) the impact on the UE's downlink beam. For example, the UE may transmit a two-step physical random access channel (PRACH) transmission indicating that the MPE condition is met and indicating an updated uplink beam (referred to herein as a two-step scheme and in Figure 4As another example, the UE may transmit a message indicating that the MPE condition is met, and may receive an uplink grant on the active downlink beam for transmitting information indicating an updated uplink beam. By providing the indication using the two-step PRACH transmission or the message, the UE indicates to the base station that the MPE condition is met. In addition, by receiving a response to the two-step PRACH transmission or the message on the active downlink beam, the impact on the downlink is reduced, thereby improving the downlink throughput and reducing the waiting time.

[0054] Figure 3 3 is a diagram illustrating an example 300 of a first procedure for indicating that an MPE condition is satisfied according to various aspects of the present disclosure. The procedure shown in example 300 involves transmitting a two-step RACH message and is referred to herein as a two-step scheme. As shown, example 300 includes UE 120 and BS 110. UE 120 and BS 110 may be associated with a communication link that may be maintained using a transmit beam and a receive beam. For example, a downlink between UE 120 and BS 110 may be maintained by a transmit beam of BS 110 and a receive beam of UE 120, and an uplink between UE 120 and BS 110 may be maintained by a transmit beam of UE 120 and a receive beam of BS 110. From an MPE perspective, only the transmit beam of UE 120 may be problematic because BS 110 is likely far enough away from the user of UE 120 that the transmit beam of BS 110 does not cause significant illumination to the user, and because the receive beam of UE 120 is produced by a spatial filter applied to the set of receive antennas of UE 120 (rather than by energy radiated from the transmit antennas of UE 120).

[0055] As indicated by reference numeral 310, UE 120 may determine that an MPE condition is satisfied. The MPE condition may be related to one or more transmit beams generated by UE 120. For example, UE 120 may determine that a threshold associated with the MPE condition is satisfied. The threshold may be related to, for example, total radiated power, maximum output power, effective isotropic radiated power (EIRP), radiated power on a single beam, radiated power on a beam directed toward a user of UE 120, and the like.

[0056] As indicated by reference numeral 320, in some aspects, UE 120 may select a beam for transmitting a message associated with an MPE condition. For example, UE 120 may select a beam on which to transmit a dedicated message A PRACH (MsgA-PRACH) for MPE. In some aspects, UE 120 may select any transmit beam of UE 120 to transmit the message. For example, UE 120 may select any transmit beam not associated with an MPE condition. As further shown, in some aspects, UE 120 may select an updated transmit beam for a communication link (e.g., uplink) between UE 120 and BS 110. For example, UE 120 may select an updated transmit beam not associated with an MPE condition. As another example, UE 120 may select a beam for any cell and any bandwidth portion of UE 120.

[0057] As indicated by reference numeral 330, UE 120 may transmit the message (e.g., MsgA-PRACH). The message may indicate that the MPE condition is satisfied for UE 120. For example, the message may be transmitted on a beam different from the beam that satisfies the MPE condition. In some aspects, UE 120 may transmit the message on the selected beam even when an uplink grant is available. For example, UE 120 may transmit the message without using an uplink grant. As indicated by reference numeral 340, UE 120 may transmit a payload of MsgA-PRACH. For example, UE 120 may transmit a MsgA physical uplink shared channel (MsgA-PUSCH) in association with the message. As further shown, the payload may include information indicating an updated uplink beam (e.g., an updated transmit beam) selected by UE 120. For example, the payload may include a media access control (MAC) control element (CE) indicating the updated transmit beam or another form of information.

[0058] As shown by reference numeral 350, UE 120 may receive a response from BS 110 on a downlink active beam. The response may acknowledge a message transmitted by UE 120 and / or an updated transmit beam. As shown by reference numeral 360, in some aspects, the response may be a random access response (RAR). For example, the response may be scrambled using a random access radio network temporary identifier (RA-RNTI) associated with a response to a message associated with the MPE condition being satisfied. In some aspects, the downlink active beam may not be configured for RAR. For example, the RAR may be provided on any downlink active beam of UE 120 (e.g., a beam with a lowest control resource set identifier or another beam). Thus, BS 110 may provide a response to UE 120 on an already active downlink beam, thereby reducing the interruption and waiting time that would otherwise be incurred by configuring a new downlink beam based at least in part on a PRACH procedure initiated by UE 120.

[0059] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described herein. Figure 3 Examples described.

[0060] Figure 4 4 is a diagram illustrating an example 400 of a second procedure for indicating that an MPE condition is satisfied according to various aspects of the present disclosure. The procedure described in example 400 is referred to herein as a three-step approach. As shown, example 400 includes UE 120 and BS 110. UE 120 and BS 110 may be associated with a communication link, such as in conjunction with Figure 3 Described in more detail.

[0061] As indicated by reference numeral 410, UE 120 may determine that the MPE condition is satisfied. As indicated by reference numeral 420, UE 120 may select a beam for the message and / or select a beam for the updated transmit beam. These operations may be combined with Figure 3 Described in more detail.

[0062] As indicated by reference numeral 430, UE 120 may transmit a message to BS 110 indicating that the MPE condition is satisfied. For example, the message may include a contention-free physical random access channel (CF-PRACH) message, a scheduling request physical uplink control channel (SR-PUCCH) message, and the like. In some aspects, the message may be dedicated to MPE reporting. By receiving the message from UE 110, BS 120 may be indicated that MPE exists at UE 110 and may prepare for a response. In some aspects, the message may be transmitted using any beam, such as the beam selected at reference numeral 420. For example, the message may be transmitted using an uplink transmit beam that is not preconfigured for SR-PUCCH or CF-PRACH. The resources or timing of the SR-PUCCH or CF-PRACH used for the message may be associated with a downlink beam. The downlink beam may also be indicated to BS 110 by UE 120 selecting the resources or timing of the SR-PUCCH or CF-PRACH. The downlink beam may be one of the downlink active beams at UE 120. For example, the downlink active beam may be a beam configured for UE 120 to monitor a set of control resources (eg, a beam of control resources having a lowest identifier).

[0063] As indicated by reference numeral 440, UE 120 may receive a response to the message on the downlink active beam, which in combination with Figure 3Described in more detail. The downlink active beam may be a beam associated with and / or indicated by the resource or timing of the message. As shown by reference numeral 450, the response may include an uplink grant, such as a dedicated uplink grant for information indicating an updated transmit beam. For example, the uplink grant may be transmitted on a control resource set and / or search space (which may be an RRC configured to be specific to UE 120 and / or dedicated to receiving a response to the message). The uplink grant may be associated with a resource allocation for information indicating an updated transmit beam. Thus, UE 120 may monitor an uplink grant (e.g., uplink downlink control information (UL-DCI)) on a control resource set and / or search space to determine that there is a resource allocation for information indicating an updated transmit beam. In some aspects, the UL-DCI may be scrambled by a cell RNTI (C-RNTI) associated with UE 110. As indicated by reference numeral 460, UE 120 may transmit a physical uplink shared channel (PUSCH) based at least in part on the uplink grant. For example, UE 120 may transmit the PUSCH on the same beam as the message. As further shown, the PUSCH may include information identifying the updated transmit beam in MAC-CE signaling, etc. In the case where UE 120 communicates with BS 110 using carrier aggregation, MAC-CE signaling may also be used to indicate one or more updated transmit beams for component carriers other than the component carrier on which the message is transmitted that are associated with the MPE condition. Thus, UE 120 may indicate that the MPE condition is met, and may indicate updated transmit beams for UE 120 for which the MPE condition is not met. BS 110 may acknowledge such indications using uplink grants and / or RARs transmitted on the active downlink beams of UE 120, which may reduce interruptions and latency.

[0064] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described herein. Figure 4 Examples described.

[0065] 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 of a UE (eg, UE 120, etc.) performing operations associated with reporting for a maximum permitted exposure.

[0066] like Figure 5As shown in , in some aspects, process 500 may include determining that an MPE condition is satisfied for the UE (block 510). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may determine that an MPE condition is satisfied for the UE, as described above.

[0067] like Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include transmitting a message to a base station based at least in part on determining that the MPE condition is satisfied (block 520). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit a message to a base station based at least in part on determining that the MPE condition is satisfied, as described above.

[0068] like Figure 5 As further shown in FIG. 5 , in some aspects, process 500 may include transmitting beam information to a base station based at least in part on an MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE (block 530). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit beam information to a base station based at least in part on an MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, as described above. The beam information may be included in a payload of the message, or may be transmitted separately from the message on an uplink grant.

[0069] Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0070] In a first aspect, the message includes a preamble of a random access channel message, and the beam information indicating the updated transmit beam for the UE is carried in a physical uplink shared channel of the random access channel message.

[0071] In a second aspect, alone or in combination with the first aspect, process 500 includes selecting the updated transmit beam from a set of transmit beams that do not exceed the MPE condition.

[0072] In a third aspect, either alone or in combination with one or more of the first and second aspects, process 500 includes selecting a beam on which to transmit the message, wherein the beam is different from a beam associated with satisfying the MPE condition for the UE.

[0073] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 500 includes receiving a response associated with the message.

[0074] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the response is received on an active downlink beam of the UE.

[0075] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the active downlink beam is associated with a lowest control resource set identifier of an active beam group associated with the UE.

[0076] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the active downlink beam is not changed in association with receiving the response.

[0077] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the response includes a grant for resources for transmitting the beam information indicating the updated transmit beam.

[0078] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the response is associated with a specific set of control resources or a specific search space indicating that the response is associated with the grant for the resource.

[0079] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the message and the beam information indicating the updated transmit beam for the UE are transmitted on the same beam.

[0080] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the beam information indicating the updated transmit beam is a medium access control (MAC) control element (CE).

[0081] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the message is transmitted without using an existing uplink grant for the UE.

[0082] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the message is transmitted using a contention-free physical random access channel (CF-PRACH) resource or a scheduling request physical uplink control channel (SR-PUCCH) resource.

[0083] although Figure 5 An example block diagram of process 500 is shown, but in some aspects, process 500 may include Figure 5Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 500. Additionally or alternatively, two or more blocks of the process 500 may be executed in parallel.

[0084] Figure 6 is a diagram illustrating an example process 600, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 600 is an example of a base station (eg, base station 110, etc.) performing operations associated with reporting for a maximum permitted exposure.

[0085] like Figure 6 As shown in , in some aspects, process 600 may include: receiving a message from a UE indicating that an MPE condition of the UE is satisfied (block 610). For example, a base station may receive a message from a UE indicating that an MPE condition of the UE is satisfied, as described above.

[0086] like Figure 6 As further shown in FIG. 6 , in some aspects, process 600 may include receiving beam information from a UE based at least in part on an MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE (block 620). For example, a base station (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may receive beam information from a UE based at least in part on an MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, as described above.

[0087] like Figure 6 As further shown in FIG. 6 , in some aspects, process 600 may include communicating with the UE based at least in part on the updated transmit beam (block 630). For example, the base station (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may communicate with the UE based at least in part on the updated transmit beam, as described above.

[0088] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0089] In a first aspect, the message comprises a preamble of a random access channel message, and wherein the beam information indicating the updated transmit beam for the UE is carried in a physical uplink shared channel of the random access channel message.

[0090] In a second aspect, either alone or in combination with the first aspect, the beam on which the message is received is different from the beam associated with satisfying the MPE condition for the UE.

[0091] In a third aspect, either alone or in combination with one or more of the first and second aspects, process 600 includes transmitting a response associated with the message.

[0092] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the response is transmitted for an active downlink beam of the UE.

[0093] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the active downlink beam is associated with a lowest control resource set identifier of an active beam group associated with the UE.

[0094] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the response includes a grant for resources for transmitting the beam information indicating the updated transmit beam.

[0095] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the response is associated with a specific set of control resources or a specific search space indicating that the response is associated with the grant for the resource.

[0096] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the message and the beam information indicating the updated transmit beam for the UE are received on the same beam.

[0097] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the beam information indicating the updated transmit beam is a medium access control (MAC) control element (CE).

[0098] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the message is transmitted using a contention-free physical random access channel (CF-PRACH) resource or a scheduling request physical uplink control channel (SR-PUCCH) resource.

[0099] although Figure 6 An example block diagram of process 600 is shown, but in some aspects, process 600 may include Figure 6 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in process 600. Additionally or alternatively, two or more blocks of process 600 may be executed in parallel.

[0100] 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 may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0101] 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.

[0102] 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.

[0103] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0104] Although specific feature combinations are described 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 not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items refers to any combination of these items, including a single member. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0105] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items, 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 items (e.g., related items, non-related items, combinations of related items and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: determining that a maximum permissible exposure (MPE) condition is satisfied for the UE; selecting a beam on which to transmit a message indicating that the MPE condition is satisfied, wherein the beam is different from a beam associated with satisfying the MPE condition for the UE; transmitting the message to a network entity using the selected beam; as well as Transmitting beam information to the network entity based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, wherein the message and the beam information indicating the updated transmit beam for the UE are transmitted on the same beam.

2. The method of claim 1, further comprising: The updated transmit beam is selected from a set of transmit beams that do not exceed the MPE condition.

3. The method of claim 1, further comprising: A response associated with the message is received.

4. The method of claim 3, wherein the response is received on an active downlink beam of the UE.

5. The method of claim 4, wherein the active downlink beam is associated with a lowest control resource set identifier of an active beam group associated with the UE. The method of claim 4 , wherein the active downlink beam is not changed in association with receiving the response.

7. The method of claim 3, wherein the response comprises a grant for resources for transmitting the beam information indicating the updated transmit beam.

8. The method of claim 7, wherein the response is associated with a specific set of control resources or a specific search space indicating that the response is associated with the grant for the resource.

9. The method of claim 1, wherein the beam information indicating the updated transmit beam is a medium access control (MAC) control element (CE).

10. The method of claim 1, wherein the message is transmitted without using an existing uplink grant for the UE.

11. The method of claim 1, wherein the message is transmitted using a contention-free physical random access channel (CF-PRACH) resource or a scheduling request physical uplink control channel (SR-PUCCH) resource.

12. A wireless communication method performed by a network entity, comprising: receiving a message from a user equipment (UE) indicating that a maximum permitted exposure (MPE) condition for the UE is satisfied, wherein a beam on which the message is received is different than a beam associated with satisfying the MPE condition for the UE; receiving beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, wherein the message and the beam information indicating the updated transmit beam for the UE are received on the same beam; as well as Communicate with the UE based at least in part on the updated transmit beam.

13. The method of claim 12, wherein the message comprises a preamble of a random access channel message, and wherein the beam information indicating the updated transmit beam for the UE is carried in a physical uplink shared channel of the random access channel message.

14. The method of claim 12, further comprising: A response associated with the message is transmitted.

15. The method of claim 14, wherein the response is transmitted for an active downlink beam of the UE.

16. The method of claim 15, wherein the active downlink beam is associated with a lowest control resource set identifier of an active beam group associated with the UE.

17. The method of claim 14, wherein the response comprises a grant for resources for transmitting the beam information indicating the updated transmit beam.

18. The method of claim 17, wherein the response is associated with a specific set of control resources or a specific search space indicating that the response is associated with the grant for the resource.

19. The method of claim 12, wherein: The beam information indicating the updated transmit beam is a medium access control (MAC) control element (CE).

20. The method of claim 12, wherein the message is transmitted using a contention-free physical random access channel (CF-PRACH) resource or a scheduling request physical uplink control channel (SR-PUCCH) resource.

21. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining that a maximum permissible exposure (MPE) condition is satisfied for the UE; selecting a beam on which to transmit a message indicating that the MPE condition is satisfied, wherein the beam is different from a beam associated with satisfying the MPE condition for the UE; transmitting the message to a network entity using the selected beam; as well as Transmitting beam information to the network entity based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, wherein the message and the beam information indicating the updated transmit beam for the UE are transmitted on the same beam.

22. A network entity for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receiving a message from a user equipment (UE) indicating that a maximum permitted exposure (MPE) condition for the UE is satisfied, wherein a beam on which the message is received is different than a beam associated with satisfying the MPE condition for the UE; receiving beam information from the UE based at least in part on the MPE condition being satisfied, the beam information indicating an updated transmit beam for the UE, wherein the message and the beam information indicating the updated transmit beam for the UE are received on the same beam; as well as Communicate with the UE based at least in part on the updated transmit beam.

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