Maximum Permissible Exposure Ancillary Information Report

Abstract

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for handling maximum permitted exposure (MPE) events. In some cases, upon detecting an MPE event, a UE may provide assistance information that a base station may use to adjust uplink scheduling to reduce the impact of the MPE event.

Description

Technical Field

[0001] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for handling maximum permissible exposure (MPE) events. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, and broadcast. These wireless communication systems may employ multiple-access systems that can share available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access systems include the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the LTE-Advanced (LTE-A) system, the Code Division Multiple Access (CDMA) system, the Time Division Multiple Access (TDMA) system, the Frequency Division Multiple Access (FDMA) system, the Orthogonal Frequency Division Multiple Access (OFDMA) system, the Single Carrier Frequency Division Multiple Access (SC FDMA) system, and the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, to name a few.

[0003] In some examples, a wireless multiple access communication system may include multiple base stations (BSs), each of which is capable of simultaneously supporting communication for multiple communication devices (also referred to as user equipment (UE)). In an LTE or LTE-A network, a set of one or more base stations may define an eNodeB (eNB). In other examples (e.g., in next-generation, new radio (NR) or 5G networks), a wireless multiple access communication system may include multiple distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmit receive points (TRPs), etc.) communicating with multiple central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein a set of one or more DUs communicating with a CU may define an access node (e.g., which may be referred to as a BS, 5G NB, next-generation NodeB (gNB or gNodeB), transmit receive point (TRP), etc.). A BS or DU may communicate with a set of UEs on a downlink channel (e.g., for transmission from the BS or DU to the UE) and an uplink channel (e.g., for transmission from the UE to the BS or DU).

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, regional, and even global level. NR (e.g., New Radio or 5G) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0005] However, as demand for mobile broadband access continues to increase, further improvements to NR and LTE technologies are needed. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that adopt them. Summary of the Invention

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

[0007] Certain aspects provide a method for wireless communication by a user equipment. The method generally includes detecting a potential maximum permitted exposure (MPE) event and providing MPE assistance information to a network entity in response to the detection.

[0008] Certain aspects provide a method for wireless communications by a network entity. The method generally includes receiving, from a user equipment (UE), maximum permitted exposure (MPE) assistance information indicating that the UE has detected an MPE event, and using the MPE assistance information to adjust uplink scheduling of the UE to reduce the impact of the MPE event.

[0009] Certain aspects provide components, means, and / or computer-readable media having computer-executable code stored thereon for performing the techniques described herein.

[0010] To accomplish the foregoing and related ends, one or more aspects include the features hereinafter fully described and particularly pointed out in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are indicative of but a few of the various ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order that the manner in which the above-described features of the present disclosure may be understood in detail, a more particular description, briefly summarized above, may be had by reference to various aspects, some of which are illustrated in the accompanying drawings. It should be noted, however, that the drawings illustrate only certain typical aspects of the disclosure and are therefore not to be considered limiting of its scope, as the description may admit to other equally effective aspects.

[0012] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0013] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs), in accordance with certain aspects of the present disclosure.

[0014] Figure 3A-3C An example MPE event is shown.

[0015] Figure 4A-4B Example MPE events in a carrier aggregation (CA) scenario are shown.

[0016] Figure 5 Example operations that may be performed by a user equipment (UE) in accordance with certain aspects of the present disclosure are illustrated.

[0017] Figure 6 Example operations that may be performed by a network entity in accordance with certain aspects of the present disclosure are illustrated.

[0018] Figure 7 An example MPE-assisted configuration is shown in accordance with certain aspects of the present disclosure.

[0019] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0020] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for handling maximum permissible exposure (MPE) events.

[0021] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. The functions and arrangements of the elements discussed may be changed without departing from the scope of this disclosure. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to some examples may be combined in some other examples. For example, a device or method may be implemented using any number of the aspects set forth herein. In addition, the scope of this disclosure is intended to cover devices or methods that are practiced using other structures, functions, or structures and functions in addition to the various aspects of this disclosure set forth herein, or that are practiced using other structures, functions, or structures and functions in addition to the various aspects of this disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects.

[0022] The techniques described herein can be used for various wireless communication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and cdma2000. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers the IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA network can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, and the like. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS).

[0023] New Radio (NR) is an emerging wireless communication technology developed jointly with the 5G Technology Forum (5GTF). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization called the "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, 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 higher, including NR technology.

[0024] New Radio (NR) access (e.g., 5G technology) can support various wireless communication services, such as enhanced mobile broadband (eMBB) for wide bandwidth (e.g., 80 MHz or higher), millimeter wave (mmW) for high carrier frequency (e.g., 25 GHz or higher), massive machine type communication (mMTC) for non-backward compatible MTC technology, and / or mission-critical ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet their respective quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0025] Example Wireless Communication System

[0026] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be implemented. For example, Figure 1 The UE 120 and the BS 110 may be configured to perform the following respective references Figure 5 and Figure 6 Described operations to handle MPE events.

[0027] like Figure 1As shown, the wireless communication network 100 may include multiple base stations (BSs) 110 and other network entities. A BS may be a station that communicates with a user equipment (UE). Each BS 110 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of a NodeB (NB) and / or the coverage area of a NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and next-generation NodeB (gNB or gNodeB), NRBS, 5G NB, access point (AP), or transmit / receive point (TRP) may be interchangeable. In some examples, a cell may not necessarily be stationary, and the geographic area of a cell may move depending on the location of a mobile BS. In some examples, base stations may interconnect with each other and / or with one or more other base stations or network nodes (not shown) in the wireless communication network 100 via various types of backhaul interfaces (such as direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network.

[0028] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (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, subcarrier, channel, tone, subband, 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.

[0029] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) 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 home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown in FIG, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more (e.g., three) cells.

[0030] The wireless communication network 100 may also include a relay station. A relay station is a station that receives transmissions of data and / or other information from an upstream station (e.g., a BS or a UE) and sends transmissions of data and / or other information to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that relays transmissions for other UEs. Figure 1 , a relay station 110r may communicate with the BS 110a and the UE 120r to facilitate communication between the BS 110a and the UE 120r. A relay station may also be referred to as a relay BS, a relay device, etc.

[0031] The wireless communication network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relays, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless communication network 100. For example, a macro BS may have a high transmit power level (e.g., 20 watts), while a pico BS, a femto BS, and a relay may have a lower transmit power level (e.g., 1 watt).

[0032] Wireless communication network 100 may support synchronous or asynchronous operation. For synchronous operation, BSs may have similar frame timing, and transmissions from different BSs may be roughly aligned in time. For asynchronous operation, BSs may have different frame timing, and transmissions from different BSs may not be aligned in time. The techniques described herein may be used for both synchronous and asynchronous operation.

[0033] A network controller 130 may couple to a set of BSs and provide coordination and control of these BSs. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0034] UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE may be fixed or mobile. A UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smartphone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biometric sensor / device, wearable device (e.g., smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired media. Some UEs may be considered machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0035] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing can be 15 kHz, and the minimum resource allocation (called a "resource block" (RB)) can be 12 subcarriers (or 180 kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband may cover 1.08 MHz (ie, 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0036] Although aspects of the examples described herein may be associated with LTE technology, aspects of the present disclosure may be applicable to other wireless communication systems, such as NR. NR can utilize OFDM with CP on both the uplink and downlink and includes support for half-duplex operation using TDD. Beamforming can be supported, and beam directions can be dynamically configured. MIMO transmission with precoding can also be supported. MIMO configurations in the DL can support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE can be supported. Multiple cell aggregation of up to 8 serving cells can be supported.

[0037] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communications between some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entities utilize the resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communications. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, UEs may also communicate directly with each other.

[0038] refer to Figure 1 , a solid line with double arrows represents desired transmission between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and / or uplink. A thin dashed line with double arrows represents interfering transmissions between the UE and the BS.

[0039] Figure 2 Shown is a block diagram illustrating an example base station (BS) and an example user equipment (UE), according to some aspects of the present disclosure.

[0040] At BS 110, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. Data may be for a physical downlink shared channel (PDSCH), etc. The processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, or reference symbols, as applicable, and may provide output symbol streams to modulators (MODs) 232a-232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and frequency upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t can be transmitted via antennas 234a-234t, respectively.

[0041] At the UE 120, antennas 252a-252r can receive downlink signals from the BS 110 and can provide received signals to demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 can obtain received symbols from all demodulators 254a-254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information to a controller / processor 280.

[0042] On the uplink, at UE 120, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by a demodulator in the transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the BS 110. At the BS 110, the uplink signal from the UE 120 may be received by the antenna 234, processed by the modulator 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. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller / processor 240 .

[0043] Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively. A scheduler 244 may schedule UEs for data transmission on the downlink or uplink.

[0044] The controller / processor 280 (and / or other processors and modules) at the UE 120 and / or the controller / processor 240 (and / or other processors and modules) at the BS 110 may directly execute or direct the execution of the instructions for use herein (e.g., with reference to Figure 5 and Figure 6 ) described in [1].

[0045] Example MPE Ancillary Information Report

[0046] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for handling maximum permitted exposure (MPE) events. As described below, a UE may be configured to report MPE assistance information upon detecting an MPE event. The MPE assistance information may allow the gNB to adjust uplink scheduling to mitigate the impact of an MPE event detected by the UE.

[0047] Upon detecting that the signal path is at least partially blocked, for example, by a user's hand, the UE may be configured to switch antenna panels and / or increase transmit power to compensate for the higher path loss caused by the blockage. However, transmission at millimeter wave frequencies may have potential health effects on the human body. Therefore, certain regulatory organizations, such as the Federal Communications Commission (FCC) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP), impose maximum permissible exposure (MPE) limits on transmitters at various carrier frequencies. The MPE constraints are typically specified in terms of a short-term time average of the radiated power, a medium-term time average of the radiated power, a local spatial average of the radiated power, and / or a medium spatial average of the radiated power. Therefore, although the UE may increase the transmit power at the blocked antenna or panel, the UE may be required to comply with the MPE constraints imposed by the regulatory organization. Therefore, the UE may not be able to increase the transmit power by an amount sufficient to overcome the high path loss caused by the user's hand.

[0048] Figure 3A An example scenario before an MPE event is shown, where downlink and uplink transmissions are not affected. Figure 3A As shown, the uplink transmission from the UE may not exceed the MPE constraint, so no MPE event is detected. Figure 3B As shown, the downlink transmission still complies with the MPE constraints, but due to the blocked signal path, in order to successfully transmit on the uplink, the UE may need to use transmission parameters that do not comply with one or more MPE constraints. Figure 3B In , an MPE event is detected for uplink transmission. Figure 3C In this case, the uplink transmission parameters have been modified, so no MPE event is detected.

[0049] In some cases, the modification of uplink transmission parameters may be based on MPE assistance information, as described herein. Figure 3B and Figure 3C (as well as Figure 4A The example shown in ) shows a person blocking the signal path, but detection of an MPE event typically only requires determining that a transmission with certain parameters would exceed the MPE constraints and does not require detection of a person.

[0050] Figure 4A and Figure 4B An example carrier aggregation (CA) and handover scenario is shown, where MPE events may also occur. In this case, all radios need to meet the MPE constraint. For example, for sub-6 GHz (3G, 4G, 5G, WiFi, and Bluetooth) and 5G NR mmWave (e.g., 28 GHz, 39 GHz, etc.), as well as for simultaneous transmission scenarios, the MPE constraint also needs to be met. For example, in an inter-band CA scenario (e.g., 28 GHz + 39 GHz or 28 GHz + 60 GHz), the total MPE from the frequency bands needs to meet the MPE constraint.

[0051] exist Figure 4A In , a clear path to cell 0 may mean that no MPE event is detected for that cell. However, for cells 1 and 2, due to the obstructed signal paths, in order to successfully transmit on the uplink, the UE may need to use transmission parameters that do not comply with one or more MPE constraints. Figure 4A In FIG, an MPE event is detected for uplink transmissions of cell 1 and cell 2.

[0052] Figure 4B An example handover scenario is shown. Although no MPE event is shown in this example, handover from one cell to another is an example of an action that can be taken in response to detecting (or to avoid) an MPE event. In some cases, such handover can be based on MPE assistance information, as described herein.

[0053] Aspects of the present disclosure provide techniques that may configure a UE to detect an MPE event and report MPE assistance information measurements, which may help a gNB reduce the impact of an MPE event detected by the UE.

[0054] Figure 5 5 illustrates example operations 500 that may be performed by a UE in accordance with certain aspects of the present disclosure. For example, operations 500 may be performed by Figure 1 or Figure 2 UE 120 performs.

[0055] Operations 500 begin with detecting a potential maximum permitted exposure (MPE) event, at 502. At 504, the UE provides MPE assistance information to a network entity in response to the detection.

[0056] Figure 6 Example operations 600 are shown that may be performed by a network entity (e.g., a gNB) in accordance with certain aspects of the present disclosure and may be considered as an example of Figure 5 For example, operation 600 may be performed by the gNB to configure the UE to Figure 5Operation 500 detects MPE events and reports MPE assistance information.

[0057] Operations 600 begin by receiving maximum permitted exposure (MPE) assistance information from a user equipment (UE) indicating that the UE has detected an MPE event at 602. At 604, the network entity uses the MPE assistance information to adjust uplink scheduling of the UE to reduce the impact of the MPE event.

[0058] As described above, the UE may be configured to detect various MPE events and report MPE assistance information. For example, the MPE assistance information may be reported via a message in a Radio Resource Control (RRC) Information Element (IE), which is referred to as the MPEAssistance IE in the RRC signaling. Figure 7 As shown in , in some cases, the configuration may include a timer designed to limit how often the UE reports MPE assistance information. The value of the timer may be configured to conserve resources while still providing relatively fast and efficient reporting.

[0059] Various types of information may be included in the MPE assistance information. Generally speaking, any type of information that can be used by the gNB to adjust uplink communications to reduce the impact of a detected MPE event may be included.

[0060] Examples of such information include one or more of the following: the preferred number of UL secondary cells (Scells), the preferred number of simultaneous UL Scells, the preferred total UL bandwidth, the preferred number of UL MIMO layers, and the preferred number of frequency bands. The information may also include one or more preferred power-related parameters, such as target received power (P0), path loss compensation factor (α), and bits per resource element (BPRE). The information may also include one or more of the following: the preferred minimum UL period, the preferred multiplexing mode, the preferred number of simultaneous UL beams, and the preferred UL repetition interval.

[0061] Exactly which parameters are reported as MPE assistance information and the specific values may depend on the specific event detected and the goals / preferences of the UE.

[0062] For example, in the case where the UE experiences an MPE event, if the UE prefers to temporarily reduce the maximum number of secondary component carriers for the UL, the UE may:

[0063] Include reducedULCCs in the MPEAssistance IE;

[0064] Set reducedULCCs to the maximum number of UL SCells that the UE prefers to be temporarily configured in the uplink; and

[0065] Set suggestedCCstoReduce to the list of UL SCells that the UE prefers not to be configured temporarily in the uplink.

[0066] If the UE prefers to temporarily reduce the number of simultaneous UL transmissions, the UE may:

[0067] Include reducedMaxSimULs in the MPEAssistance IE; and

[0068] Set reducedMaxSimULs to the maximum number of simultaneous ULs that the UE prefers to be temporarily scheduled in the uplink.

[0069] If the UE prefers to temporarily reduce the maximum aggregate UL bandwidth, the UE may:

[0070] Include reducedMaxULBW in the MPEAssistance IE;

[0071] Set reducedMaxULBW to the maximum aggregate bandwidth that the UE would like to be temporarily configured with across all uplink carriers; and

[0072] reduceMaxRBs is set to the maximum scheduled RBs that the UE prefers to be temporarily scheduled in the uplink carrier.

[0073] If the UE prefers to temporarily reduce the maximum number of UL MIMO layers per serving cell:

[0074] Including reducedMaxULMIMO-Layers in the MPEAssistance IE; and

[0075] Set reducedMaxULMIMO-Layers to the maximum number of MIMO layers per serving cell that the UE prefers to be temporarily configured with in the uplink;

[0076] If the UE prefers to temporarily reduce the number of frequency bands, the UE may:

[0077] Including reducedULfrequency-bands in the MPEAssistance IE; and

[0078] Set reducedULfrequency-bandlist to the list of frequency bands that the UE prefers to be temporarily configured for the uplink.

[0079] If the UE prefers to temporarily reduce P0, α and BPRE in power control, the UE may:

[0080] including reducedmaxP0AlphaandBPRE in the MPEAssistance IE; and

[0081] ReducedmaxP0AlphaandBPRE is set to the maximum value of P0, α and BPRE that the UE prefers to be temporarily configured for uplink.

[0082] If the UE prefers to temporarily increase the minimum periodicity of periodic or semi-periodic uplink transmissions, the UE may:

[0083] Include increaseMinPeriodicity in the MPEAssistance IE; and

[0084] Set increasePeriodicity to the minimum value of the period that the UE prefers to be temporarily configured for uplink transmission.

[0085] The periodic or semi-periodic uplink transmission may include a sounding reference signal (SRS), a physical uplink shared channel (PUSCH), and a physical uplink control channel (PUCCH).

[0086] If the UE prefers to temporarily reduce the number of simultaneous uplink transmissions, the UE may:

[0087] Including reducedMultiplexingMode in the MPEAssistance IE; and

[0088] Set reducedMultiplexingMode to the non-FDM or non-SDM uplink scheme that the UE prefers to be temporarily scheduled in the uplink,

[0089] Among them, the non-FDM or non-SDM uplink scheme can be time division multiplexing (TDM) uplink transmission.

[0090] If the UE prefers to temporarily reduce the number of simultaneous uplink transmissions, the UE may:

[0091] Include reducedMaxSimULBeams in the MPEAssistance IE; and

[0092] reducedSimULBeams is set to the maximum value of simultaneous uplink beams that the UE prefers to be temporarily scheduled in the uplink.

[0093] If the UE prefers to temporarily increase the interval between uplink repetition transmissions, the UE may:

[0094] Include increasedRepetitionInterval in the MPEAssistance IE; and

[0095] The increasedMinRepetitionInterval is set to the minimum interval between repetitions of uplink transmissions that the UE prefers to be temporarily scheduled in the uplink.

[0096] The repetition of uplink transmission may include repetition of SRS, PUSCH, and PUCCH.

[0097] As described above, the UE can be configured to limit how often it reports MPE assistance information. For example, when reporting MPE assistance information, the UE can start a timer (e.g., T346 timer), where the timer value is set to MPEIndicationProhibitTimer in the MPE assistance configuration. The UE will not send another MPE assistance information before the timer expires.

[0098] If and when the UE is no longer experiencing an MPE event, it may report in a manner indicating that no MPE event is currently detected (e.g., omitting certain parameters). For example, to indicate that the UE is no longer experiencing an MPE event, the UE may not include reducedMaxULCCs, reducedMaxSimULs, reducedMaxULBW, reducedMaxULMIMO-Layers, reducedULfrequency-bands, reducedmaxP0andBPRE, increasedMinPeriodicity, reducedMultiplexingMode, reducedMaxSimULBeams, or increasedMinRepetitionInterval in the MPEAssistance information element (IE). Even in this case, the UE may start a timer (e.g., timer T346) with the timer value set to MPEIndicationProhibitTimer. The UE shall not send another MPE assistance information until the timer expires.

[0099] The methods disclosed herein include one or more steps or actions for implementing these methods. Without departing from the scope of the claims, the method steps and / or actions may be interchangeable with each other. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions may be modified without departing from the scope of the claims.

[0100] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including individual members. For example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0101] As used herein, the term "determining" includes a variety of actions. For example, "determining" may include calculating, estimating, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), confirming, etc. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. Furthermore, "determining" may include resolving, selecting, choosing, establishing, etc.

[0102] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are to be given the full scope consistent with the language of the claims, wherein, unless otherwise expressly stated, elements mentioned in the singular are not intended to mean "one and only one", but rather "one or more". Unless otherwise expressly stated, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described in this disclosure are known or will later become known to those of ordinary skill in the art and are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is expressly stated in the claims. No claim element shall be interpreted under the provisions of 35 USC § 112 (f) unless the element is expressly stated using the phrase "means for..." or, in the case of a method claim, the element is stated using the phrase "step for..."

[0103] The various operations of the above methods may be performed by any suitable device capable of performing the corresponding functions. The device may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs), or processors. Generally, where there are operations shown in the figures, these operations may have corresponding corresponding device-plus-function components. For example, Figure 5 and Figure 6 The various operations shown in FIG. 1 may be performed by BS 110 and / or UE 120 in Figure 2The various processors shown are executed.

[0104] The various illustrative logical blocks, modules, and circuits described in connection with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, which are designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0105] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link various circuits together, including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits known in the art, such as timing sources, peripherals, voltage regulators, power management circuits, etc., and therefore will not be described further. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how best to implement the described functionality for a processing system based on the specific application and the overall design constraints imposed on the entire system.

[0106] If implemented in software, the functionality may be stored and transmitted as one or more instructions or code on a computer-readable medium. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referring to software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media include computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one location to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. The computer-readable storage medium may be coupled to the processor so that the processor can read information from and write information to the storage medium. Alternatively, the storage medium may be integrated into the processor. For example, the machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separate from the wireless node, all of which can be accessed by the processor via a bus interface. Alternatively, or in addition, the machine-readable medium or any portion thereof may be integrated into the processor, such as may be the case with a cache and / or general register file. Examples of machine-readable storage media may include, for example, RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media or any combination thereof. The machine-readable medium may be embodied in a computer program product.

[0107] A software module may include a single instruction or multiple instructions and may be distributed across several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may be located in a single storage device or distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into RAM. During execution of a software module, the processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When referring to the functions of a software module below, it should be understood that such functions are implemented by the processor when executing instructions from that software module.

[0108] Furthermore, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies (such as infrared (IR), radio, and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies (such as infrared (IR), radio, and microwave) are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Disks, where magnetic disks typically reproduce data magnetically, and platters reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Further, for other aspects, computer-readable media may include transitory computer-readable media (e.g., signals). Combinations of the above are also intended to be included within the scope of computer-readable media.

[0109] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having stored thereon (and / or encoded thereon) instructions, the instructions being executable by one or more processors to perform the operations described herein. For example, a computer program product for performing the operations described herein and in Figure 5 and Figure 6 The operation instructions are shown in .

[0110] In addition, it should be understood that, where applicable, modules and / or other appropriate components for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, the various methods described herein can be provided by a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disk (CD) or floppy disk, etc.), such that the user terminal and / or base station can obtain the various methods when the storage device is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be utilized.

[0111] It is to be understood that the claims are not limited to the precise configuration and components illustrated above, and that various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a user equipment (UE), comprising: detecting a potential MPE event based on determining that an uplink transmission parameter exceeds a maximum permissible exposure MPE constraint; as well as providing MPE assistance information to a network entity upon detecting the MPE event, the MPE assistance information comprising parameters selected depending on a preference of the UE, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

2. The method according to claim 1, wherein The MPE assistance information further includes at least one of the following: a preferred number of uplink cells, a preferred number of simultaneous uplink secondary cells, a preferred total uplink bandwidth, or a preferred number of uplink MIMO layers.

3. The method according to claim 1, wherein The MPE assistance information further includes at least one of the following: a preferred number of frequency bands, a preferred value of a set of parameters, the set of parameters including P0, α, and BPRE.

4. The method according to claim 1, wherein The MPE assistance information further includes at least one of the following: a preferred minimum UL period, a preferred multiplexing mode, a preferred number of simultaneous UL beams, or a preferred uplink repetition interval.

5. The method according to claim 1, wherein After detecting the MPE event, the UE further includes a reduced preferred maximum secondary component carrier for UL in the MPE assistance information.

6. The method according to claim 1, wherein The UE indicates that it no longer experiences the MPE event by resending the MPE assistance information.

7. The method according to claim 1, wherein After detecting the MPE event, the UE further includes a reduced number of simultaneous UL transmissions in the MPE assistance information.

8. The method according to claim 1, wherein After detecting the MPE event, the UE further includes a reduced maximum aggregate UL bandwidth in the MPE assistance information.

9. The method according to claim 1, wherein After detecting the MPE event, the UE further includes at least one of a reduced maximum uplink multiple-input multiple-output (UL-MIMO) number or a reduced number of frequency bands in the MPE assistance information.

10. The method according to claim 1, wherein After detecting the MPE event, the UE further includes a reduced multiplexing mode in the MPE assistance information.

11. The method according to claim 1, wherein After detecting the MPE event, the UE further includes a reduced maximum number of simultaneous uplinks or downloads in the MPE assistance information.

12. The method according to claim 1, wherein After detecting the MPE event, the UE further includes an increased repetition interval in the MPE assistance information.

13. A method for wireless communication between a network entity and a network entity, comprising: receiving maximum allowed exposure (MPE) assistance information from a user equipment (UE), the MPE assistance information indicating that the UE has detected an MPE event based on determining that uplink transmission parameters exceed MPE constraints, the MPE assistance information including parameters selected depending on a preference of the UE; as well as using the MPE assistance information to adjust uplink scheduling of the UE so as to reduce the impact of the MPE event, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

14. The method according to claim 13, wherein The MPE assistance information further includes at least one of the following: a preferred number of uplink cells, a preferred number of simultaneous uplink secondary cells, a preferred total uplink bandwidth, or a preferred number of uplink MIMO layers.

15. The method according to claim 13, wherein The MPE assistance information further includes at least one of the following: a preferred number of frequency bands, a preferred value of a set of parameters, the set of parameters including P0, α, and BPRE.

16. The method according to claim 13, wherein: The MPE assistance information further includes at least one of the following: a preferred minimum UL period, a preferred multiplexing mode, a preferred number of simultaneous UL beams, or a preferred uplink repetition interval.

17. The method according to claim 13, wherein: After detecting the MPE event, the UE further includes a reduced preferred maximum secondary component carrier for UL in the MPE assistance information.

18. The method according to claim 13, wherein The UE indicates that it no longer experiences the MPE event by resending the MPE assistance information.

19. The method according to claim 13, wherein After detecting the MPE event, the UE further includes a reduced number of simultaneous UL transmissions in the MPE assistance information.

20. The method according to claim 13, wherein After detecting the MPE event, the UE further includes a reduced maximum aggregate UL bandwidth in the MPE assistance information.

21. The method according to claim 13, wherein After detecting the MPE event, the UE further includes at least one of a reduced maximum uplink multiple-input multiple-output (UL-MIMO) number or a reduced number of frequency bands in the MPE assistance information.

22. The method according to claim 13, wherein After detecting the MPE event, the UE further includes a reduced multiplexing mode in the MPE assistance information.

23. The method according to claim 13, wherein After detecting the MPE event, the UE further includes a reduced maximum number of simultaneous uplinks or downloads in the MPE assistance information.

24. The method according to claim 13, wherein After detecting the MPE event, the UE further includes an increased repetition interval in the MPE assistance information.

25. An apparatus for user equipment (UE) to perform wireless communication, comprising: means for detecting a potential MPE event based on determining that an uplink transmission parameter exceeds a maximum permissible exposure MPE constraint; as well as means for providing MPE assistance information to a network entity upon detecting the MPE event, the MPE assistance information comprising parameters selected depending on preferences of the UE, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

26. An apparatus for wireless communication between a network entity and a network entity, comprising: means for receiving maximum allowed exposure (MPE) assistance information from a user equipment (UE), the MPE assistance information indicating that the UE has detected an MPE event based on determining that uplink transmission parameters exceed MPE constraints, the MPE assistance information comprising parameters selected depending on preferences of the UE; as well as means for using the MPE assistance information to adjust uplink scheduling of the UE so as to reduce the impact of the MPE event, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

27. An apparatus for user equipment (UE) to perform wireless communication, comprising: at least one processor configured to detect a potential MPE event based on determining that an uplink transmission parameter exceeds a maximum permissible exposure MPE constraint; as well as a transmitter configured to provide MPE assistance information to a network entity upon detecting the MPE event, the MPE assistance information comprising parameters selected depending on a preference of the UE, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

28. An apparatus for wireless communication between a network entity and a network entity, comprising: a receiver configured to receive maximum allowed exposure (MPE) assistance information from a user equipment (UE), the MPE assistance information indicating that the UE has detected an MPE event based on determining that uplink transmission parameters exceed MPE constraints, the MPE assistance information comprising parameters selected depending on a preference of the UE; as well as at least one processor configured to use the MPE assistance information to adjust uplink scheduling of the UE to reduce the impact of the MPE event, After detecting the MPE event, the UE further includes an increased minimum period in the MPE assistance information.

29. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a user equipment (UE) to cause the processors to perform the method according to any one of claims 1 to 12.

30. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a network entity to cause the processors to perform the method of any one of claims 13-24.

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